- 14 Aug, 2014 11 commits
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Eric Dumazet authored
[ Upstream commit 757efd32 ] Dave reported following splat, caused by improper use of IP_INC_STATS_BH() in process context. BUG: using __this_cpu_add() in preemptible [00000000] code: trinity-c117/14551 caller is __this_cpu_preempt_check+0x13/0x20 CPU: 3 PID: 14551 Comm: trinity-c117 Not tainted 3.16.0+ #33 ffffffff9ec898f0 0000000047ea7e23 ffff88022d32f7f0 ffffffff9e7ee207 0000000000000003 ffff88022d32f818 ffffffff9e397eaa ffff88023ee70b40 ffff88022d32f970 ffff8801c026d580 ffff88022d32f828 ffffffff9e397ee3 Call Trace: [<ffffffff9e7ee207>] dump_stack+0x4e/0x7a [<ffffffff9e397eaa>] check_preemption_disabled+0xfa/0x100 [<ffffffff9e397ee3>] __this_cpu_preempt_check+0x13/0x20 [<ffffffffc0839872>] sctp_packet_transmit+0x692/0x710 [sctp] [<ffffffffc082a7f2>] sctp_outq_flush+0x2a2/0xc30 [sctp] [<ffffffff9e0d985c>] ? mark_held_locks+0x7c/0xb0 [<ffffffff9e7f8c6d>] ? _raw_spin_unlock_irqrestore+0x5d/0x80 [<ffffffffc082b99a>] sctp_outq_uncork+0x1a/0x20 [sctp] [<ffffffffc081e112>] sctp_cmd_interpreter.isra.23+0x1142/0x13f0 [sctp] [<ffffffffc081c86b>] sctp_do_sm+0xdb/0x330 [sctp] [<ffffffff9e0b8f1b>] ? preempt_count_sub+0xab/0x100 [<ffffffffc083b350>] ? sctp_cname+0x70/0x70 [sctp] [<ffffffffc08389ca>] sctp_primitive_ASSOCIATE+0x3a/0x50 [sctp] [<ffffffffc083358f>] sctp_sendmsg+0x88f/0xe30 [sctp] [<ffffffff9e0d673a>] ? lock_release_holdtime.part.28+0x9a/0x160 [<ffffffff9e0d62ce>] ? put_lock_stats.isra.27+0xe/0x30 [<ffffffff9e73b624>] inet_sendmsg+0x104/0x220 [<ffffffff9e73b525>] ? inet_sendmsg+0x5/0x220 [<ffffffff9e68ac4e>] sock_sendmsg+0x9e/0xe0 [<ffffffff9e1c0c09>] ? might_fault+0xb9/0xc0 [<ffffffff9e1c0bae>] ? might_fault+0x5e/0xc0 [<ffffffff9e68b234>] SYSC_sendto+0x124/0x1c0 [<ffffffff9e0136b0>] ? syscall_trace_enter+0x250/0x330 [<ffffffff9e68c3ce>] SyS_sendto+0xe/0x10 [<ffffffff9e7f9be4>] tracesys+0xdd/0xe2 This is a followup of commits f1d8cba6 ("inet: fix possible seqlock deadlocks") and 7f88c6b2 ("ipv6: fix possible seqlock deadlock in ip6_finish_output2") Signed-off-by:
Eric Dumazet <edumazet@google.com> Cc: Hannes Frederic Sowa <hannes@stressinduktion.org> Reported-by:
Dave Jones <davej@redhat.com> Acked-by:
Neil Horman <nhorman@tuxdriver.com> Acked-by:
Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Sasha Levin authored
[ Upstream commit 06ebb06d ] Check for cases when the caller requests 0 bytes instead of running off and dereferencing potentially invalid iovecs. Signed-off-by:
Sasha Levin <sasha.levin@oracle.com> Signed-off-by:
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Vlad Yasevich authored
[ Upstream commit fcdfe3a7 ] When performing segmentation, the mac_len value is copied right out of the original skb. However, this value is not always set correctly (like when the packet is VLAN-tagged) and we'll end up copying a bad value. One way to demonstrate this is to configure a VM which tags packets internally and turn off VLAN acceleration on the forwarding bridge port. The packets show up corrupt like this: 16:18:24.985548 52:54:00:ab:be:25 > 52:54:00:26:ce:a3, ethertype 802.1Q (0x8100), length 1518: vlan 100, p 0, ethertype 0x05e0, 0x0000: 8cdb 1c7c 8cdb 0064 4006 b59d 0a00 6402 ...|...d@.....d. 0x0010: 0a00 6401 9e0d b441 0a5e 64ec 0330 14fa ..d....A.^d..0.. 0x0020: 29e3 01c9 f871 0000 0101 080a 000a e833)....q.........3 0x0030: 000f 8c75 6e65 7470 6572 6600 6e65 7470 ...unetperf.netp 0x0040: 6572 6600 6e65 7470 6572 6600 6e65 7470 erf.netperf.netp 0x0050: 6572 6600 6e65 7470 6572 6600 6e65 7470 erf.netperf.netp 0x0060: 6572 6600 6e65 7470 6572 6600 6e65 7470 erf.netperf.netp ... This also leads to awful throughput as GSO packets are dropped and cause retransmissions. The solution is to set the mac_len using the values already available in then new skb. We've already adjusted all of the header offset, so we might as well correctly figure out the mac_len using skb_reset_mac_len(). After this change, packets are segmented correctly and performance is restored. CC: Eric Dumazet <edumazet@google.com> Signed-off-by:
Vlad Yasevich <vyasevic@redhat.com> Signed-off-by:
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Vlad Yasevich authored
[ Upstream commit 081e83a7 ] Macvlan devices do not initialize vlan_features. As a result, any vlan devices configured on top of macvlans perform very poorly. Initialize vlan_features based on the vlan features of the lower-level device. Signed-off-by:
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Daniel Borkmann authored
[ Upstream commit 1be9a950 ] Jason reported an oops caused by SCTP on his ARM machine with SCTP authentication enabled: Internal error: Oops: 17 [#1] ARM CPU: 0 PID: 104 Comm: sctp-test Not tainted 3.13.0-68744-g3632f30c9b20-dirty #1 task: c6eefa40 ti: c6f52000 task.ti: c6f52000 PC is at sctp_auth_calculate_hmac+0xc4/0x10c LR is at sg_init_table+0x20/0x38 pc : [<c024bb80>] lr : [<c00f32dc>] psr: 40000013 sp : c6f538e8 ip : 00000000 fp : c6f53924 r10: c6f50d80 r9 : 00000000 r8 : 00010000 r7 : 00000000 r6 : c7be4000 r5 : 00000000 r4 : c6f56254 r3 : c00c8170 r2 : 00000001 r1 : 00000008 r0 : c6f1e660 Flags: nZcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 0005397f Table: 06f28000 DAC: 00000015 Process sctp-test (pid: 104, stack limit = 0xc6f521c0) Stack: (0xc6f538e8 to 0xc6f54000) [...] Backtrace: [<c024babc>] (sctp_auth_calculate_hmac+0x0/0x10c) from [<c0249af8>] (sctp_packet_transmit+0x33c/0x5c8) [<c02497bc>] (sctp_packet_transmit+0x0/0x5c8) from [<c023e96c>] (sctp_outq_flush+0x7fc/0x844) [<c023e170>] (sctp_outq_flush+0x0/0x844) from [<c023ef78>] (sctp_outq_uncork+0x24/0x28) [<c023ef54>] (sctp_outq_uncork+0x0/0x28) from [<c0234364>] (sctp_side_effects+0x1134/0x1220) [<c0233230>] (sctp_side_effects+0x0/0x1220) from [<c02330b0>] (sctp_do_sm+0xac/0xd4) [<c0233004>] (sctp_do_sm+0x0/0xd4) from [<c023675c>] (sctp_assoc_bh_rcv+0x118/0x160) [<c0236644>] (sctp_assoc_bh_rcv+0x0/0x160) from [<c023d5bc>] (sctp_inq_push+0x6c/0x74) [<c023d550>] (sctp_inq_push+0x0/0x74) from [<c024a6b0>] (sctp_rcv+0x7d8/0x888) While we already had various kind of bugs in that area ec0223ec ("net: sctp: fix sctp_sf_do_5_1D_ce to verify if we/peer is AUTH capable") and b14878cc ("net: sctp: cache auth_enable per endpoint"), this one is a bit of a different kind. Giving a bit more background on why SCTP authentication is needed can be found in RFC4895: SCTP uses 32-bit verification tags to protect itself against blind attackers. These values are not changed during the lifetime of an SCTP association. Looking at new SCTP extensions, there is the need to have a method of proving that an SCTP chunk(s) was really sent by the original peer that started the association and not by a malicious attacker. To cause this bug, we're triggering an INIT collision between peers; normal SCTP handshake where both sides intent to authenticate packets contains RANDOM; CHUNKS; HMAC-ALGO parameters that are being negotiated among peers: ---------- INIT[RANDOM; CHUNKS; HMAC-ALGO] ----------> <------- INIT-ACK[RANDOM; CHUNKS; HMAC-ALGO] --------- -------------------- COOKIE-ECHO --------------------> <-------------------- COOKIE-ACK --------------------- RFC4895 says that each endpoint therefore knows its own random number and the peer's random number *after* the association has been established. The local and peer's random number along with the shared key are then part of the secret used for calculating the HMAC in the AUTH chunk. Now, in our scenario, we have 2 threads with 1 non-blocking SEQ_PACKET socket each, setting up common shared SCTP_AUTH_KEY and SCTP_AUTH_ACTIVE_KEY properly, and each of them calling sctp_bindx(3), listen(2) and connect(2) against each other, thus the handshake looks similar to this, e.g.: ---------- INIT[RANDOM; CHUNKS; HMAC-ALGO] ----------> <------- INIT-ACK[RANDOM; CHUNKS; HMAC-ALGO] --------- <--------- INIT[RANDOM; CHUNKS; HMAC-ALGO] ----------- -------- INIT-ACK[RANDOM; CHUNKS; HMAC-ALGO] --------> ... Since such collisions can also happen with verification tags, the RFC4895 for AUTH rather vaguely says under section 6.1: In case of INIT collision, the rules governing the handling of this Random Number follow the same pattern as those for the Verification Tag, as explained in Section 5.2.4 of RFC 2960 [5]. Therefore, each endpoint knows its own Random Number and the peer's Random Number after the association has been established. In RFC2960, section 5.2.4, we're eventually hitting Action B: B) In this case, both sides may be attempting to start an association at about the same time but the peer endpoint started its INIT after responding to the local endpoint's INIT. Thus it may have picked a new Verification Tag not being aware of the previous Tag it had sent this endpoint. The endpoint should stay in or enter the ESTABLISHED state but it MUST update its peer's Verification Tag from the State Cookie, stop any init or cookie timers that may running and send a COOKIE ACK. In other words, the handling of the Random parameter is the same as behavior for the Verification Tag as described in Action B of section 5.2.4. Looking at the code, we exactly hit the sctp_sf_do_dupcook_b() case which triggers an SCTP_CMD_UPDATE_ASSOC command to the side effect interpreter, and in fact it properly copies over peer_{random, hmacs, chunks} parameters from the newly created association to update the existing one. Also, the old asoc_shared_key is being released and based on the new params, sctp_auth_asoc_init_active_key() updated. However, the issue observed in this case is that the previous asoc->peer.auth_capable was 0, and has *not* been updated, so that instead of creating a new secret, we're doing an early return from the function sctp_auth_asoc_init_active_key() leaving asoc->asoc_shared_key as NULL. However, we now have to authenticate chunks from the updated chunk list (e.g. COOKIE-ACK). That in fact causes the server side when responding with ... <------------------ AUTH; COOKIE-ACK ----------------- ... to trigger a NULL pointer dereference, since in sctp_packet_transmit(), it discovers that an AUTH chunk is being queued for xmit, and thus it calls sctp_auth_calculate_hmac(). Since the asoc->active_key_id is still inherited from the endpoint, and the same as encoded into the chunk, it uses asoc->asoc_shared_key, which is still NULL, as an asoc_key and dereferences it in ... crypto_hash_setkey(desc.tfm, &asoc_key->data[0], asoc_key->len) ... causing an oops. All this happens because sctp_make_cookie_ack() called with the *new* association has the peer.auth_capable=1 and therefore marks the chunk with auth=1 after checking sctp_auth_send_cid(), but it is *actually* sent later on over the then *updated* association's transport that didn't initialize its shared key due to peer.auth_capable=0. Since control chunks in that case are not sent by the temporary association which are scheduled for deletion, they are issued for xmit via SCTP_CMD_REPLY in the interpreter with the context of the *updated* association. peer.auth_capable was 0 in the updated association (which went from COOKIE_WAIT into ESTABLISHED state), since all previous processing that performed sctp_process_init() was being done on temporary associations, that we eventually throw away each time. The correct fix is to update to the new peer.auth_capable value as well in the collision case via sctp_assoc_update(), so that in case the collision migrated from 0 -> 1, sctp_auth_asoc_init_active_key() can properly recalculate the secret. This therefore fixes the observed server panic. Fixes: 730fc3d0 ("[SCTP]: Implete SCTP-AUTH parameter processing") Reported-by:
Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by:
Daniel Borkmann <dborkman@redhat.com> Tested-by:
Vlad Yasevich <vyasevich@gmail.com> Signed-off-by:
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Christoph Paasch authored
[ Upstream commit 1f74e613 ] In vegas we do a multiplication of the cwnd and the rtt. This may overflow and thus their result is stored in a u64. However, we first need to cast the cwnd so that actually 64-bit arithmetic is done. Then, we need to do do_div to allow this to be used on 32-bit arches. Cc: Stephen Hemminger <stephen@networkplumber.org> Cc: Neal Cardwell <ncardwell@google.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: David Laight <David.Laight@ACULAB.COM> Cc: Doug Leith <doug.leith@nuim.ie> Fixes: 8d3a564d (tcp: tcp_vegas cong avoid fix) Signed-off-by:
Christoph Paasch <christoph.paasch@uclouvain.be> Signed-off-by:
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Christoph Paasch authored
[ Upstream commit 45a07695 ] In veno we do a multiplication of the cwnd and the rtt. This may overflow and thus their result is stored in a u64. However, we first need to cast the cwnd so that actually 64-bit arithmetic is done. A first attempt at fixing 76f10177 ([TCP]: TCP Veno congestion control) was made by 15913114 (tcp: Overflow bug in Vegas), but it failed to add the required cast in tcp_veno_cong_avoid(). Fixes: 76f10177 ([TCP]: TCP Veno congestion control) Signed-off-by:
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Andrey Ryabinin authored
[ Upstream commit 40eea803 ] Sasha's report: > While fuzzing with trinity inside a KVM tools guest running the latest -next > kernel with the KASAN patchset, I've stumbled on the following spew: > > [ 4448.949424] ================================================================== > [ 4448.951737] AddressSanitizer: user-memory-access on address 0 > [ 4448.952988] Read of size 2 by thread T19638: > [ 4448.954510] CPU: 28 PID: 19638 Comm: trinity-c76 Not tainted 3.16.0-rc4-next-20140711-sasha-00046-g07d3099-dirty #813 > [ 4448.956823] ffff88046d86ca40 0000000000000000 ffff880082f37e78 ffff880082f37a40 > [ 4448.958233] ffffffffb6e47068 ffff880082f37a68 ffff880082f37a58 ffffffffb242708d > [ 4448.959552] 0000000000000000 ffff880082f37a88 ffffffffb24255b1 0000000000000000 > [ 4448.961266] Call Trace: > [ 4448.963158] dump_stack (lib/dump_stack.c:52) > [ 4448.964244] kasan_report_user_access (mm/kasan/report.c:184) > [ 4448.965507] __asan_load2 (mm/kasan/kasan.c:352) > [ 4448.966482] ? netlink_sendmsg (net/netlink/af_netlink.c:2339) > [ 4448.967541] netlink_sendmsg (net/netlink/af_netlink.c:2339) > [ 4448.968537] ? get_parent_ip (kernel/sched/core.c:2555) > [ 4448.970103] sock_sendmsg (net/socket.c:654) > [ 4448.971584] ? might_fault (mm/memory.c:3741) > [ 4448.972526] ? might_fault (./arch/x86/include/asm/current.h:14 mm/memory.c:3740) > [ 4448.973596] ? verify_iovec (net/core/iovec.c:64) > [ 4448.974522] ___sys_sendmsg (net/socket.c:2096) > [ 4448.975797] ? put_lock_stats.isra.13 (./arch/x86/include/asm/preempt.h:98 kernel/locking/lockdep.c:254) > [ 4448.977030] ? lock_release_holdtime (kernel/locking/lockdep.c:273) > [ 4448.978197] ? lock_release_non_nested (kernel/locking/lockdep.c:3434 (discriminator 1)) > [ 4448.979346] ? check_chain_key (kernel/locking/lockdep.c:2188) > [ 4448.980535] __sys_sendmmsg (net/socket.c:2181) > [ 4448.981592] ? trace_hardirqs_on_caller (kernel/locking/lockdep.c:2600) > [ 4448.982773] ? trace_hardirqs_on (kernel/locking/lockdep.c:2607) > [ 4448.984458] ? syscall_trace_enter (arch/x86/kernel/ptrace.c:1500 (discriminator 2)) > [ 4448.985621] ? trace_hardirqs_on_caller (kernel/locking/lockdep.c:2600) > [ 4448.986754] SyS_sendmmsg (net/socket.c:2201) > [ 4448.987708] tracesys (arch/x86/kernel/entry_64.S:542) > [ 4448.988929] ================================================================== This reports means that we've come to netlink_sendmsg() with msg->msg_name == NULL and msg->msg_namelen > 0. After this report there was no usual "Unable to handle kernel NULL pointer dereference" and this gave me a clue that address 0 is mapped and contains valid socket address structure in it. This bug was introduced in f3d33426 (net: rework recvmsg handler msg_name and msg_namelen logic). Commit message states that: "Set msg->msg_name = NULL if user specified a NULL in msg_name but had a non-null msg_namelen in verify_iovec/verify_compat_iovec. This doesn't affect sendto as it would bail out earlier while trying to copy-in the address." But in fact this affects sendto when address 0 is mapped and contains socket address structure in it. In such case copy-in address will succeed, verify_iovec() function will successfully exit with msg->msg_namelen > 0 and msg->msg_name == NULL. This patch fixes it by setting msg_namelen to 0 if msg_name == NULL. Cc: Hannes Frederic Sowa <hannes@stressinduktion.org> Cc: Eric Dumazet <edumazet@google.com> Cc: <stable@vger.kernel.org> Reported-by:
Andrey Ryabinin <a.ryabinin@samsung.com> Acked-by:
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Eric Dumazet authored
[ Upstream commit 04ca6973 ] In "Counting Packets Sent Between Arbitrary Internet Hosts", Jeffrey and Jedidiah describe ways exploiting linux IP identifier generation to infer whether two machines are exchanging packets. With commit 73f156a6 ("inetpeer: get rid of ip_id_count"), we changed IP id generation, but this does not really prevent this side-channel technique. This patch adds a random amount of perturbation so that IP identifiers for a given destination [1] are no longer monotonically increasing after an idle period. Note that prandom_u32_max(1) returns 0, so if generator is used at most once per jiffy, this patch inserts no hole in the ID suite and do not increase collision probability. This is jiffies based, so in the worst case (HZ=1000), the id can rollover after ~65 seconds of idle time, which should be fine. We also change the hash used in __ip_select_ident() to not only hash on daddr, but also saddr and protocol, so that ICMP probes can not be used to infer information for other protocols. For IPv6, adds saddr into the hash as well, but not nexthdr. If I ping the patched target, we can see ID are now hard to predict. 21:57:11.008086 IP (...) A > target: ICMP echo request, seq 1, length 64 21:57:11.010752 IP (... id 2081 ...) target > A: ICMP echo reply, seq 1, length 64 21:57:12.013133 IP (...) A > target: ICMP echo request, seq 2, length 64 21:57:12.015737 IP (... id 3039 ...) target > A: ICMP echo reply, seq 2, length 64 21:57:13.016580 IP (...) A > target: ICMP echo request, seq 3, length 64 21:57:13.019251 IP (... id 3437 ...) target > A: ICMP echo reply, seq 3, length 64 [1] TCP sessions uses a per flow ID generator not changed by this patch. Signed-off-by:
Jeffrey Knockel <jeffk@cs.unm.edu> Reported-by:
Jedidiah R. Crandall <crandall@cs.unm.edu> Cc: Willy Tarreau <w@1wt.eu> Cc: Hannes Frederic Sowa <hannes@redhat.com> Signed-off-by:
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Eric Dumazet authored
[ Upstream commit 73f156a6 ] Ideally, we would need to generate IP ID using a per destination IP generator. linux kernels used inet_peer cache for this purpose, but this had a huge cost on servers disabling MTU discovery. 1) each inet_peer struct consumes 192 bytes 2) inetpeer cache uses a binary tree of inet_peer structs, with a nominal size of ~66000 elements under load. 3) lookups in this tree are hitting a lot of cache lines, as tree depth is about 20. 4) If server deals with many tcp flows, we have a high probability of not finding the inet_peer, allocating a fresh one, inserting it in the tree with same initial ip_id_count, (cf secure_ip_id()) 5) We garbage collect inet_peer aggressively. IP ID generation do not have to be 'perfect' Goal is trying to avoid duplicates in a short period of time, so that reassembly units have a chance to complete reassembly of fragments belonging to one message before receiving other fragments with a recycled ID. We simply use an array of generators, and a Jenkin hash using the dst IP as a key. ipv6_select_ident() is put back into net/ipv6/ip6_output.c where it belongs (it is only used from this file) secure_ip_id() and secure_ipv6_id() no longer are needed. Rename ip_select_ident_more() to ip_select_ident_segs() to avoid unnecessary decrement/increment of the number of segments. Signed-off-by:
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Dmitry Kravkov authored
[ Upstream commit fe26566d ] When TSO packet is transmitted additional BD w/o mapping is used to describe the packed. The BD needs special handling in tx completion. kernel: Call Trace: kernel: <IRQ> [<ffffffff815e19ba>] dump_stack+0x19/0x1b kernel: [<ffffffff8105dee1>] warn_slowpath_common+0x61/0x80 kernel: [<ffffffff8105df5c>] warn_slowpath_fmt+0x5c/0x80 kernel: [<ffffffff814a8c0d>] ? find_iova+0x4d/0x90 kernel: [<ffffffff814ab0e2>] intel_unmap_page.part.36+0x142/0x160 kernel: [<ffffffff814ad0e6>] intel_unmap_page+0x26/0x30 kernel: [<ffffffffa01f55d7>] bnx2x_free_tx_pkt+0x157/0x2b0 [bnx2x] kernel: [<ffffffffa01f8dac>] bnx2x_tx_int+0xac/0x220 [bnx2x] kernel: [<ffffffff8101a0d9>] ? read_tsc+0x9/0x20 kernel: [<ffffffffa01f8fdb>] bnx2x_poll+0xbb/0x3c0 [bnx2x] kernel: [<ffffffff814d041a>] net_rx_action+0x15a/0x250 kernel: [<ffffffff81067047>] __do_softirq+0xf7/0x290 kernel: [<ffffffff815f3a5c>] call_softirq+0x1c/0x30 kernel: [<ffffffff81014d25>] do_softirq+0x55/0x90 kernel: [<ffffffff810673e5>] irq_exit+0x115/0x120 kernel: [<ffffffff815f4358>] do_IRQ+0x58/0xf0 kernel: [<ffffffff815e94ad>] common_interrupt+0x6d/0x6d kernel: <EOI> [<ffffffff810bbff7>] ? clockevents_notify+0x127/0x140 kernel: [<ffffffff814834df>] ? cpuidle_enter_state+0x4f/0xc0 kernel: [<ffffffff81483615>] cpuidle_idle_call+0xc5/0x200 kernel: [<ffffffff8101bc7e>] arch_cpu_idle+0xe/0x30 kernel: [<ffffffff810b4725>] cpu_startup_entry+0xf5/0x290 kernel: [<ffffffff815cfee1>] start_secondary+0x265/0x27b kernel: ---[ end trace 11aa7726f18d7e80 ]--- Fixes: a848ade4 ("bnx2x: add CSUM and TSO support for encapsulation protocols") Reported-by:
Yulong Pei <ypei@redhat.com> Cc: Michal Schmidt <mschmidt@redhat.com> Signed-off-by:
Dmitry Kravkov <Dmitry.Kravkov@qlogic.com> Signed-off-by:
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- 07 Aug, 2014 28 commits
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Greg Kroah-Hartman authored
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Boris Ostrovsky authored
commit 8762e509 upstream. init_espfix_ap() is currently off by one level when informing hypervisor that allocated pages will be used for ministacks' page tables. The most immediate effect of this on a PV guest is that if 'stack_page = __get_free_page()' returns a non-zeroed-out page the hypervisor will refuse to use it for a page table (which it shouldn't be anyway). This will result in warnings by both Xen and Linux. More importantly, a subsequent write to that page (again, by a PV guest) is likely to result in fatal page fault. Signed-off-by:
Boris Ostrovsky <boris.ostrovsky@oracle.com> Link: http://lkml.kernel.org/r/1404926298-5565-1-git-send-email-boris.ostrovsky@oracle.comReviewed-by:
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by:
H. Peter Anvin <hpa@linux.intel.com> Signed-off-by:
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Minfei Huang authored
commit c75b53af upstream. I use btree from 3.14-rc2 in my own module. When the btree module is removed, a warning arises: kmem_cache_destroy btree_node: Slab cache still has objects CPU: 13 PID: 9150 Comm: rmmod Tainted: GF O 3.14.0-rc2 #1 Hardware name: Inspur NF5270M3/NF5270M3, BIOS CHEETAH_2.1.3 09/10/2013 Call Trace: dump_stack+0x49/0x5d kmem_cache_destroy+0xcf/0xe0 btree_module_exit+0x10/0x12 [btree] SyS_delete_module+0x198/0x1f0 system_call_fastpath+0x16/0x1b The cause is that it doesn't release the last btree node, when height = 1 and fill = 1. [akpm@linux-foundation.org: remove unneeded test of NULL] Signed-off-by:
Minfei Huang <huangminfei@ucloud.cn> Cc: Joern Engel <joern@logfs.org> Cc: Johannes Berg <johannes@sipsolutions.net> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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Sasha Levin authored
commit 3cf521f7 upstream. The l2tp [get|set]sockopt() code has fallen back to the UDP functions for socket option levels != SOL_PPPOL2TP since day one, but that has never actually worked, since the l2tp socket isn't an inet socket. As David Miller points out: "If we wanted this to work, it'd have to look up the tunnel and then use tunnel->sk, but I wonder how useful that would be" Since this can never have worked so nobody could possibly have depended on that functionality, just remove the broken code and return -EINVAL. Reported-by:
James Chapman <jchapman@katalix.com> Acked-by:
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willy tarreau authored
commit 71f6d1b3 upstream. Right now the mvneta driver doesn't handle Tx IRQ, and relies on two mechanisms to flush Tx descriptors : a flush at the end of mvneta_tx() and a timer. If a burst of packets is emitted faster than the device can send them, then the queue is stopped until next wake-up of the timer 10ms later. This causes jerky output traffic with bursts and pauses, making it difficult to reach line rate with very few streams. A test on UDP traffic shows that it's not possible to go beyond 134 Mbps / 12 kpps of outgoing traffic with 1500-bytes IP packets. Routed traffic tends to observe pauses as well if the traffic is bursty, making it even burstier after the wake-up. It seems that this feature was inherited from the original driver but nothing there mentions any reason for not using the interrupt instead, which the chip supports. Thus, this patch enables Tx interrupts and removes the timer. It does the two at once because it's not really possible to make the two mechanisms coexist, so a split patch doesn't make sense. First tests performed on a Mirabox (Armada 370) show that less CPU seems to be used when sending traffic. One reason might be that we now call the mvneta_tx_done_gbe() with a mask indicating which queues have been done instead of looping over all of them. The same UDP test above now happily reaches 987 Mbps / 87.7 kpps. Single-stream TCP traffic can now more easily reach line rate. HTTP transfers of 1 MB objects over a single connection went from 730 to 840 Mbps. It is even possible to go significantly higher (>900 Mbps) by tweaking tcp_tso_win_divisor. Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Gregory CLEMENT <gregory.clement@free-electrons.com> Cc: Arnaud Ebalard <arno@natisbad.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Tested-by:
Arnaud Ebalard <arno@natisbad.org> Signed-off-by:
Willy Tarreau <w@1wt.eu> Signed-off-by:
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willy tarreau authored
commit 40ba35e7 upstream. Marvell has not published the chip's datasheet yet, so it's very hard to find the relevant bits to manipulate to change the IRQ behaviour. Fortunately, these bits are described in the proprietary LSP patch set which is publicly available here : http://www.plugcomputer.org/downloads/mirabox/ So let's put them back in the driver in order to reduce the burden of current and future maintenance. Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Gregory CLEMENT <gregory.clement@free-electrons.com> Tested-by:
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willy tarreau authored
commit 29021366 upstream. If a queue timeout is reported, we can oops because of some schedules while the caller is atomic, as shown below : mvneta d0070000.ethernet eth0: tx timeout BUG: scheduling while atomic: bash/1528/0x00000100 Modules linked in: slhttp_ethdiv(C) [last unloaded: slhttp_ethdiv] CPU: 2 PID: 1528 Comm: bash Tainted: G WC 3.13.0-rc4-mvebu-nf #180 [<c0011bd9>] (unwind_backtrace+0x1/0x98) from [<c000f1ab>] (show_stack+0xb/0xc) [<c000f1ab>] (show_stack+0xb/0xc) from [<c02ad323>] (dump_stack+0x4f/0x64) [<c02ad323>] (dump_stack+0x4f/0x64) from [<c02abe67>] (__schedule_bug+0x37/0x4c) [<c02abe67>] (__schedule_bug+0x37/0x4c) from [<c02ae261>] (__schedule+0x325/0x3ec) [<c02ae261>] (__schedule+0x325/0x3ec) from [<c02adb97>] (schedule_timeout+0xb7/0x118) [<c02adb97>] (schedule_timeout+0xb7/0x118) from [<c0020a67>] (msleep+0xf/0x14) [<c0020a67>] (msleep+0xf/0x14) from [<c01dcbe5>] (mvneta_stop_dev+0x21/0x194) [<c01dcbe5>] (mvneta_stop_dev+0x21/0x194) from [<c01dcfe9>] (mvneta_tx_timeout+0x19/0x24) [<c01dcfe9>] (mvneta_tx_timeout+0x19/0x24) from [<c024afc7>] (dev_watchdog+0x18b/0x1c4) [<c024afc7>] (dev_watchdog+0x18b/0x1c4) from [<c0020b53>] (call_timer_fn.isra.27+0x17/0x5c) [<c0020b53>] (call_timer_fn.isra.27+0x17/0x5c) from [<c0020cad>] (run_timer_softirq+0x115/0x170) [<c0020cad>] (run_timer_softirq+0x115/0x170) from [<c001ccb9>] (__do_softirq+0xbd/0x1a8) [<c001ccb9>] (__do_softirq+0xbd/0x1a8) from [<c001cfad>] (irq_exit+0x61/0x98) [<c001cfad>] (irq_exit+0x61/0x98) from [<c000d4bf>] (handle_IRQ+0x27/0x60) [<c000d4bf>] (handle_IRQ+0x27/0x60) from [<c000843b>] (armada_370_xp_handle_irq+0x33/0xc8) [<c000843b>] (armada_370_xp_handle_irq+0x33/0xc8) from [<c000fba9>] (__irq_usr+0x49/0x60) Ben Hutchings attempted to propose a better fix consisting in using a scheduled work for this, but while it fixed this panic, it caused other random freezes and panics proving that the reset sequence in the driver is unreliable and that additional fixes should be investigated. When sending multiple streams over a link limited to 100 Mbps, Tx timeouts happen from time to time, and the driver correctly recovers only when the function is disabled. Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Gregory CLEMENT <gregory.clement@free-electrons.com> Cc: Ben Hutchings <ben@decadent.org.uk> Tested-by:
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willy tarreau authored
commit 74c41b04 upstream. Stats writers are mvneta_rx() and mvneta_tx(). They don't lock anything when they update the stats, and as a result, it randomly happens that the stats freeze on SMP if two updates happen during stats retrieval. This is very easily reproducible by starting two HTTP servers and binding each of them to a different CPU, then consulting /proc/net/dev in loops during transfers, the interface should immediately lock up. This issue also randomly happens upon link state changes during transfers, because the stats are collected in this situation, but it takes more attempts to reproduce it. The comments in netdevice.h suggest using per_cpu stats instead to get rid of this issue. This patch implements this. It merges both rx_stats and tx_stats into a single "stats" member with a single syncp. Both mvneta_rx() and mvneta_rx() now only update the a single CPU's counters. In turn, mvneta_get_stats64() does the summing by iterating over all CPUs to get their respective stats. With this change, stats are still correct and no more lockup is encountered. Note that this bug was present since the first import of the mvneta driver. It might make sense to backport it to some stable trees. If so, it depends on "d33dc73 net: mvneta: increase the 64-bit rx/tx stats out of the hot path". Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Gregory CLEMENT <gregory.clement@free-electrons.com> Reviewed-by:
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willy tarreau authored
commit dc4277dd upstream. Better count packets and bytes in the stack and on 32 bit then accumulate them at the end for once. This saves two memory writes and two memory barriers per packet. The incoming packet rate was increased by 4.7% on the Openblocks AX3 thanks to this. Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Gregory CLEMENT <gregory.clement@free-electrons.com> Reviewed-by:
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Johannes Berg authored
commit 08b99399 upstream. This reverts commit 277d916f as it was at least breaking iwlwifi by setting the IEEE80211_TX_CTL_NO_PS_BUFFER flag in all kinds of interface modes, not only for AP mode where it is appropriate. To avoid reintroducing the original problem, explicitly check for probe request frames in the multicast buffering code. Fixes: 277d916f ("mac80211: move "bufferable MMPDU" check to fix AP mode scan") Signed-off-by:
Johannes Berg <johannes.berg@intel.com> Signed-off-by:
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Malcolm Priestley authored
commit 6cff1f6a upstream. WARNING: CPU: 0 PID: 929 at /home/apw/COD/linux/kernel/irq/handle.c:147 handle_irq_event_percpu+0x1d1/0x1e0() irq 17 handler device_intr+0x0/0xa80 [vt6655_stage] enabled interrupts Using spin_lock_irqsave appears to fix this. Signed-off-by:
Malcolm Priestley <tvboxspy@gmail.com> Signed-off-by:
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Andy Lutomirski authored
commit 7209a75d upstream. This moves the espfix64 logic into native_iret. To make this work, it gets rid of the native patch for INTERRUPT_RETURN: INTERRUPT_RETURN on native kernels is now 'jmp native_iret'. This changes the 16-bit SS behavior on Xen from OOPSing to leaking some bits of the Xen hypervisor's RSP (I think). [ hpa: this is a nonzero cost on native, but probably not enough to measure. Xen needs to fix this in their own code, probably doing something equivalent to espfix64. ] Signed-off-by:
Andy Lutomirski <luto@amacapital.net> Link: http://lkml.kernel.org/r/7b8f1d8ef6597cb16ae004a43c56980a7de3cf94.1406129132.git.luto@amacapital.netSigned-off-by:
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H. Peter Anvin authored
commit 34273f41 upstream. Embedded systems, which may be very memory-size-sensitive, are extremely unlikely to ever encounter any 16-bit software, so make it a CONFIG_EXPERT option to turn off support for any 16-bit software whatsoever. Signed-off-by:
H. Peter Anvin <hpa@zytor.com> Link: http://lkml.kernel.org/r/1398816946-3351-1-git-send-email-hpa@linux.intel.comSigned-off-by:
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H. Peter Anvin authored
commit 197725de upstream. Make espfix64 a hidden Kconfig option. This fixes the x86-64 UML build which had broken due to the non-existence of init_espfix_bsp() in UML: since UML uses its own Kconfig, this option does not appear in the UML build. This also makes it possible to make support for 16-bit segments a configuration option, for the people who want to minimize the size of the kernel. Reported-by:
Ingo Molnar <mingo@kernel.org> Signed-off-by:
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H. Peter Anvin authored
commit 20b68535 upstream. Header guard is #ifndef, not #ifdef... Reported-by:
Fengguang Wu <fengguang.wu@intel.com> Signed-off-by:
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H. Peter Anvin authored
commit e1fe9ed8 upstream. Sparse warns that the percpu variables aren't declared before they are defined. Rather than hacking around it, move espfix definitions into a proper header file. Reported-by:
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H. Peter Anvin authored
commit 3891a04a upstream. The IRET instruction, when returning to a 16-bit segment, only restores the bottom 16 bits of the user space stack pointer. This causes some 16-bit software to break, but it also leaks kernel state to user space. We have a software workaround for that ("espfix") for the 32-bit kernel, but it relies on a nonzero stack segment base which is not available in 64-bit mode. In checkin: b3b42ac2 x86-64, modify_ldt: Ban 16-bit segments on 64-bit kernels we "solved" this by forbidding 16-bit segments on 64-bit kernels, with the logic that 16-bit support is crippled on 64-bit kernels anyway (no V86 support), but it turns out that people are doing stuff like running old Win16 binaries under Wine and expect it to work. This works around this by creating percpu "ministacks", each of which is mapped 2^16 times 64K apart. When we detect that the return SS is on the LDT, we copy the IRET frame to the ministack and use the relevant alias to return to userspace. The ministacks are mapped readonly, so if IRET faults we promote #GP to #DF which is an IST vector and thus has its own stack; we then do the fixup in the #DF handler. (Making #GP an IST exception would make the msr_safe functions unsafe in NMI/MC context, and quite possibly have other effects.) Special thanks to: - Andy Lutomirski, for the suggestion of using very small stack slots and copy (as opposed to map) the IRET frame there, and for the suggestion to mark them readonly and let the fault promote to #DF. - Konrad Wilk for paravirt fixup and testing. - Borislav Petkov for testing help and useful comments. Reported-by:
Brian Gerst <brgerst@gmail.com> Signed-off-by:
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H. Peter Anvin authored
commit 7ed6fb9b upstream. This reverts commit fa81511b in preparation of merging in the proper fix (espfix64). Signed-off-by:
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Jan Kara authored
commit 504d5874 upstream. clockevents_increase_min_delta() calls printk() from under hrtimer_bases.lock. That causes lock inversion on scheduler locks because printk() can call into the scheduler. Lockdep puts it as: ====================================================== [ INFO: possible circular locking dependency detected ] 3.15.0-rc8-06195-g939f04be #2 Not tainted ------------------------------------------------------- trinity-main/74 is trying to acquire lock: (&port_lock_key){-.....}, at: [<811c60be>] serial8250_console_write+0x8c/0x10c but task is already holding lock: (hrtimer_bases.lock){-.-...}, at: [<8103caeb>] hrtimer_try_to_cancel+0x13/0x66 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (hrtimer_bases.lock){-.-...}: [<8104a942>] lock_acquire+0x92/0x101 [<8142f11d>] _raw_spin_lock_irqsave+0x2e/0x3e [<8103c918>] __hrtimer_start_range_ns+0x1c/0x197 [<8107ec20>] perf_swevent_start_hrtimer.part.41+0x7a/0x85 [<81080792>] task_clock_event_start+0x3a/0x3f [<810807a4>] task_clock_event_add+0xd/0x14 [<8108259a>] event_sched_in+0xb6/0x17a [<810826a2>] group_sched_in+0x44/0x122 [<81082885>] ctx_sched_in.isra.67+0x105/0x11f [<810828e6>] perf_event_sched_in.isra.70+0x47/0x4b [<81082bf6>] __perf_install_in_context+0x8b/0xa3 [<8107eb8e>] remote_function+0x12/0x2a [<8105f5af>] smp_call_function_single+0x2d/0x53 [<8107e17d>] task_function_call+0x30/0x36 [<8107fb82>] perf_install_in_context+0x87/0xbb [<810852c9>] SYSC_perf_event_open+0x5c6/0x701 [<810856f9>] SyS_perf_event_open+0x17/0x19 [<8142f8ee>] syscall_call+0x7/0xb -> #4 (&ctx->lock){......}: [<8104a942>] lock_acquire+0x92/0x101 [<8142f04c>] _raw_spin_lock+0x21/0x30 [<81081df3>] __perf_event_task_sched_out+0x1dc/0x34f [<8142cacc>] __schedule+0x4c6/0x4cb [<8142cae0>] schedule+0xf/0x11 [<8142f9a6>] work_resched+0x5/0x30 -> #3 (&rq->lock){-.-.-.}: [<8104a942>] lock_acquire+0x92/0x101 [<8142f04c>] _raw_spin_lock+0x21/0x30 [<81040873>] __task_rq_lock+0x33/0x3a [<8104184c>] wake_up_new_task+0x25/0xc2 [<8102474b>] do_fork+0x15c/0x2a0 [<810248a9>] kernel_thread+0x1a/0x1f [<814232a2>] rest_init+0x1a/0x10e [<817af949>] start_kernel+0x303/0x308 [<817af2ab>] i386_start_kernel+0x79/0x7d -> #2 (&p->pi_lock){-.-...}: [<8104a942>] lock_acquire+0x92/0x101 [<8142f11d>] _raw_spin_lock_irqsave+0x2e/0x3e [<810413dd>] try_to_wake_up+0x1d/0xd6 [<810414cd>] default_wake_function+0xb/0xd [<810461f3>] __wake_up_common+0x39/0x59 [<81046346>] __wake_up+0x29/0x3b [<811b8733>] tty_wakeup+0x49/0x51 [<811c3568>] uart_write_wakeup+0x17/0x19 [<811c5dc1>] serial8250_tx_chars+0xbc/0xfb [<811c5f28>] serial8250_handle_irq+0x54/0x6a [<811c5f57>] serial8250_default_handle_irq+0x19/0x1c [<811c56d8>] serial8250_interrupt+0x38/0x9e [<810510e7>] handle_irq_event_percpu+0x5f/0x1e2 [<81051296>] handle_irq_event+0x2c/0x43 [<81052cee>] handle_level_irq+0x57/0x80 [<81002a72>] handle_irq+0x46/0x5c [<810027df>] do_IRQ+0x32/0x89 [<8143036e>] common_interrupt+0x2e/0x33 [<8142f23c>] _raw_spin_unlock_irqrestore+0x3f/0x49 [<811c25a4>] uart_start+0x2d/0x32 [<811c2c04>] uart_write+0xc7/0xd6 [<811bc6f6>] n_tty_write+0xb8/0x35e [<811b9beb>] tty_write+0x163/0x1e4 [<811b9cd9>] redirected_tty_write+0x6d/0x75 [<810b6ed6>] vfs_write+0x75/0xb0 [<810b7265>] SyS_write+0x44/0x77 [<8142f8ee>] syscall_call+0x7/0xb -> #1 (&tty->write_wait){-.....}: [<8104a942>] lock_acquire+0x92/0x101 [<8142f11d>] _raw_spin_lock_irqsave+0x2e/0x3e [<81046332>] __wake_up+0x15/0x3b [<811b8733>] tty_wakeup+0x49/0x51 [<811c3568>] uart_write_wakeup+0x17/0x19 [<811c5dc1>] serial8250_tx_chars+0xbc/0xfb [<811c5f28>] serial8250_handle_irq+0x54/0x6a [<811c5f57>] serial8250_default_handle_irq+0x19/0x1c [<811c56d8>] serial8250_interrupt+0x38/0x9e [<810510e7>] handle_irq_event_percpu+0x5f/0x1e2 [<81051296>] handle_irq_event+0x2c/0x43 [<81052cee>] handle_level_irq+0x57/0x80 [<81002a72>] handle_irq+0x46/0x5c [<810027df>] do_IRQ+0x32/0x89 [<8143036e>] common_interrupt+0x2e/0x33 [<8142f23c>] _raw_spin_unlock_irqrestore+0x3f/0x49 [<811c25a4>] uart_start+0x2d/0x32 [<811c2c04>] uart_write+0xc7/0xd6 [<811bc6f6>] n_tty_write+0xb8/0x35e [<811b9beb>] tty_write+0x163/0x1e4 [<811b9cd9>] redirected_tty_write+0x6d/0x75 [<810b6ed6>] vfs_write+0x75/0xb0 [<810b7265>] SyS_write+0x44/0x77 [<8142f8ee>] syscall_call+0x7/0xb -> #0 (&port_lock_key){-.....}: [<8104a62d>] __lock_acquire+0x9ea/0xc6d [<8104a942>] lock_acquire+0x92/0x101 [<8142f11d>] _raw_spin_lock_irqsave+0x2e/0x3e [<811c60be>] serial8250_console_write+0x8c/0x10c [<8104e402>] call_console_drivers.constprop.31+0x87/0x118 [<8104f5d5>] console_unlock+0x1d7/0x398 [<8104fb70>] vprintk_emit+0x3da/0x3e4 [<81425f76>] printk+0x17/0x19 [<8105bfa0>] clockevents_program_min_delta+0x104/0x116 [<8105c548>] clockevents_program_event+0xe7/0xf3 [<8105cc1c>] tick_program_event+0x1e/0x23 [<8103c43c>] hrtimer_force_reprogram+0x88/0x8f [<8103c49e>] __remove_hrtimer+0x5b/0x79 [<8103cb21>] hrtimer_try_to_cancel+0x49/0x66 [<8103cb4b>] hrtimer_cancel+0xd/0x18 [<8107f102>] perf_swevent_cancel_hrtimer.part.60+0x2b/0x30 [<81080705>] task_clock_event_stop+0x20/0x64 [<81080756>] task_clock_event_del+0xd/0xf [<81081350>] event_sched_out+0xab/0x11e [<810813e0>] group_sched_out+0x1d/0x66 [<81081682>] ctx_sched_out+0xaf/0xbf [<81081e04>] __perf_event_task_sched_out+0x1ed/0x34f [<8142cacc>] __schedule+0x4c6/0x4cb [<8142cae0>] schedule+0xf/0x11 [<8142f9a6>] work_resched+0x5/0x30 other info that might help us debug this: Chain exists of: &port_lock_key --> &ctx->lock --> hrtimer_bases.lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(hrtimer_bases.lock); lock(&ctx->lock); lock(hrtimer_bases.lock); lock(&port_lock_key); *** DEADLOCK *** 4 locks held by trinity-main/74: #0: (&rq->lock){-.-.-.}, at: [<8142c6f3>] __schedule+0xed/0x4cb #1: (&ctx->lock){......}, at: [<81081df3>] __perf_event_task_sched_out+0x1dc/0x34f #2: (hrtimer_bases.lock){-.-...}, at: [<8103caeb>] hrtimer_try_to_cancel+0x13/0x66 #3: (console_lock){+.+...}, at: [<8104fb5d>] vprintk_emit+0x3c7/0x3e4 stack backtrace: CPU: 0 PID: 74 Comm: trinity-main Not tainted 3.15.0-rc8-06195-g939f04be #2 00000000 81c3a310 8b995c14 81426f69 8b995c44 81425a99 8161f671 8161f570 8161f538 8161f559 8161f538 8b995c78 8b142bb0 00000004 8b142fdc 8b142bb0 8b995ca8 8104a62d 8b142fac 000016f2 81c3a310 00000001 00000001 00000003 Call Trace: [<81426f69>] dump_stack+0x16/0x18 [<81425a99>] print_circular_bug+0x18f/0x19c [<8104a62d>] __lock_acquire+0x9ea/0xc6d [<8104a942>] lock_acquire+0x92/0x101 [<811c60be>] ? serial8250_console_write+0x8c/0x10c [<811c6032>] ? wait_for_xmitr+0x76/0x76 [<8142f11d>] _raw_spin_lock_irqsave+0x2e/0x3e [<811c60be>] ? serial8250_console_write+0x8c/0x10c [<811c60be>] serial8250_console_write+0x8c/0x10c [<8104af87>] ? lock_release+0x191/0x223 [<811c6032>] ? wait_for_xmitr+0x76/0x76 [<8104e402>] call_console_drivers.constprop.31+0x87/0x118 [<8104f5d5>] console_unlock+0x1d7/0x398 [<8104fb70>] vprintk_emit+0x3da/0x3e4 [<81425f76>] printk+0x17/0x19 [<8105bfa0>] clockevents_program_min_delta+0x104/0x116 [<8105cc1c>] tick_program_event+0x1e/0x23 [<8103c43c>] hrtimer_force_reprogram+0x88/0x8f [<8103c49e>] __remove_hrtimer+0x5b/0x79 [<8103cb21>] hrtimer_try_to_cancel+0x49/0x66 [<8103cb4b>] hrtimer_cancel+0xd/0x18 [<8107f102>] perf_swevent_cancel_hrtimer.part.60+0x2b/0x30 [<81080705>] task_clock_event_stop+0x20/0x64 [<81080756>] task_clock_event_del+0xd/0xf [<81081350>] event_sched_out+0xab/0x11e [<810813e0>] group_sched_out+0x1d/0x66 [<81081682>] ctx_sched_out+0xaf/0xbf [<81081e04>] __perf_event_task_sched_out+0x1ed/0x34f [<8104416d>] ? __dequeue_entity+0x23/0x27 [<81044505>] ? pick_next_task_fair+0xb1/0x120 [<8142cacc>] __schedule+0x4c6/0x4cb [<81047574>] ? trace_hardirqs_off_caller+0xd7/0x108 [<810475b0>] ? trace_hardirqs_off+0xb/0xd [<81056346>] ? rcu_irq_exit+0x64/0x77 Fix the problem by using printk_deferred() which does not call into the scheduler. Reported-by:
Jan Kara <jack@suse.cz> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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John Stultz authored
commit aac74dc4 upstream. After learning we'll need some sort of deferred printk functionality in the timekeeping core, Peter suggested we rename the printk_sched function so it can be reused by needed subsystems. This only changes the function name. No logic changes. Signed-off-by:
John Stultz <john.stultz@linaro.org> Reviewed-by:
Steven Rostedt <rostedt@goodmis.org> Cc: Jan Kara <jack@suse.cz> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Jiri Bohac <jbohac@suse.cz> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Signed-off-by:
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Lars-Peter Clausen authored
commit 61bd55ce upstream. When creating the demux table we need to iterate over the selected scan mask for the buffer to get the samples which should be copied to destination buffer. Right now the code uses the mask which contains all active channels, which means the demux table contains entries which causes it to copy all the samples from source to destination buffer one by one without doing any demuxing. Signed-off-by:
Lars-Peter Clausen <lars@metafoo.de> Signed-off-by:
Jonathan Cameron <jic23@kernel.org> Signed-off-by:
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Malcolm Priestley authored
commit 4aa0abed upstream. byReAssocCount is incremented every second resulting in disassociated message being send every 10 seconds whether connection or not. byReAssocCount should only advance while eCommandState is in WLAN_ASSOCIATE_WAIT Change existing scope to if condition. Signed-off-by:
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David Rientjes authored
commit b104a35d upstream. The page allocator relies on __GFP_WAIT to determine if ALLOC_CPUSET should be set in allocflags. ALLOC_CPUSET controls if a page allocation should be restricted only to the set of allowed cpuset mems. Transparent hugepages clears __GFP_WAIT when defrag is disabled to prevent the fault path from using memory compaction or direct reclaim. Thus, it is unfairly able to allocate outside of its cpuset mems restriction as a side-effect. This patch ensures that ALLOC_CPUSET is only cleared when the gfp mask is truly GFP_ATOMIC by verifying it is also not a thp allocation. Signed-off-by:
David Rientjes <rientjes@google.com> Reported-by:
Alex Thorlton <athorlton@sgi.com> Tested-by:
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James Bottomley authored
commit 89fb4cd1 upstream. Flush commands don't transfer data and thus need to be special cased in the I/O completion handler so that we can propagate errors to the block layer and filesystem. Signed-off-by:
James Bottomley <JBottomley@Parallels.com> Reported-by:
Steven Haber <steven@qumulo.com> Tested-by:
Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
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Alexandre Bounine authored
commit 0193ed82 upstream. This is a bug fix for the situation when function tsi721_desc_get() fails to obtain a free transaction descriptor. The bug usually results in a memory access crash dump when data transfer scatter-gather list has more entries than size of hardware buffer descriptors ring. This fix ensures that error is properly returned to a caller instead of an invalid entry. This patch is applicable to kernel versions starting from v3.5. Signed-off-by:
Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com> Cc: Stef van Os <stef.van.os@prodrive-technologies.com> Cc: Vinod Koul <vinod.koul@intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Signed-off-by:
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Eliad Peller authored
commit 8c26d458 upstream. tsc can be NULL (mac80211 currently always passes NULL), resulting in NULL-dereference. check before copying it. Signed-off-by:
Eliad Peller <eliadx.peller@intel.com> Signed-off-by:
Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by:
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Konstantin Khlebnikov authored
commit 811a2407 upstream. On LPAE, each level 1 (pgd) page table entry maps 1GiB, and the level 2 (pmd) entries map 2MiB. When the identity mapping is created on LPAE, the pgd pointers are copied from the swapper_pg_dir. If we find that we need to modify the contents of a pmd, we allocate a new empty pmd table and insert it into the appropriate 1GB slot, before then filling it with the identity mapping. However, if the 1GB slot covers the kernel lowmem mappings, we obliterate those mappings. When replacing a PMD, first copy the old PMD contents to the new PMD, so that we preserve the existing mappings, particularly the mappings of the kernel itself. [rewrote commit message and added code comment -- rmk] Fixes: ae2de101 ("ARM: LPAE: Add identity mapping support for the 3-level page table format") Signed-off-by:
Konstantin Khlebnikov <k.khlebnikov@samsung.com> Signed-off-by:
Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by:
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Milan Broz authored
commit 4c63f83c upstream. Th AF_ALG socket was missing a security label (e.g. SELinux) which means that socket was in "unlabeled" state. This was recently demonstrated in the cryptsetup package (cryptsetup v1.6.5 and later.) See https://bugzilla.redhat.com/show_bug.cgi?id=1115120 This patch clones the sock's label from the parent sock and resolves the issue (similar to AF_BLUETOOTH protocol family). Signed-off-by:
Milan Broz <gmazyland@gmail.com> Acked-by:
Paul Moore <paul@paul-moore.com> Signed-off-by:
Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by:
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- 31 Jul, 2014 1 commit
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Greg Kroah-Hartman authored
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