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  1. 14 Nov, 2020 5 commits
    • Laurent Dufour's avatar
      mm/slub: fix panic in slab_alloc_node() · 22e4663e
      Laurent Dufour authored 
      While doing memory hot-unplug operation on a PowerPC VM running 1024 CPUs
with 11TB of ram, I hit the following panic:

    BUG: Kernel NULL pointer dereference on read at 0x00000007
    Faulting instruction address: 0xc000000000456048
    Oops: Kernel access of bad area, sig: 11 [#2]
    LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS= 2048 NUMA pSeries
    Modules linked in: rpadlpar_io rpaphp
    CPU: 160 PID: 1 Comm: systemd Tainted: G      D           5.9.0 #1
    NIP:  c000000000456048 LR: c000000000455fd4 CTR: c00000000047b350
    REGS: c00006028d1b77a0 TRAP: 0300   Tainted: G      D            (5.9.0)
    MSR:  8000000000009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24004228  XER: 00000000
    CFAR: c00000000000f1b0 DAR: 0000000000000007 DSISR: 40000000 IRQMASK: 0
    GPR00: c000000000455fd4 c00006028d1b7a30 c000000001bec800 0000000000000000
    GPR04: 0000000000000dc0 0000000000000000 00000000000374ef c00007c53df99320
    GPR08: 000007c53c980000 0000000000000000 000007c53c980000 0000000000000000
    GPR12: 0000000000004400 c00000001e8e4400 0000000000000000 0000000000000f6a
    GPR16: 0000000000000000 c000000001c25930 c000000001d62528 00000000000000c1
    GPR20: c000000001d62538 c00006be469e9000 0000000fffffffe0 c0000000003c0ff8
    GPR24: 0000000000000018 0000000000000000 0000000000000dc0 0000000000000000
    GPR28: c00007c513755700 c000000001c236a4 c00007bc4001f800 0000000000000001
    NIP [c000000000456048] __kmalloc_node+0x108/0x790
    LR [c000000000455fd4] __kmalloc_node+0x94/0x790
    Call Trace:
      kvmalloc_node+0x58/0x110
      mem_cgroup_css_online+0x10c/0x270
      online_css+0x48/0xd0
      cgroup_apply_control_enable+0x2c4/0x470
      cgroup_mkdir+0x408/0x5f0
      kernfs_iop_mkdir+0x90/0x100
      vfs_mkdir+0x138/0x250
      do_mkdirat+0x154/0x1c0
      system_call_exception+0xf8/0x200
      system_call_common+0xf0/0x27c
    Instruction dump:
    e93e0000 e90d0030 39290008 7cc9402a e94d0030 e93e0000 7ce95214 7f89502a
    2fbc0000 419e0018 41920230 e9270010 <89290007> 7f994800 419e0220 7ee6bb78

This pointing to the following code:

    mm/slub.c:2851
            if (unlikely(!object || !node_match(page, node))) {
    c000000000456038:       00 00 bc 2f     cmpdi   cr7,r28,0
    c00000000045603c:       18 00 9e 41     beq     cr7,c000000000456054 <__kmalloc_node+0x114>
    node_match():
    mm/slub.c:2491
            if (node != NUMA_NO_NODE && page_to_nid(page) != node)
    c000000000456040:       30 02 92 41     beq     cr4,c000000000456270 <__kmalloc_node+0x330>
    page_to_nid():
    include/linux/mm.h:1294
    c000000000456044:       10 00 27 e9     ld      r9,16(r7)
    c000000000456048:       07 00 29 89     lbz     r9,7(r9)	<<<< r9 = NULL
    node_match():
    mm/slub.c:2491
    c00000000045604c:       00 48 99 7f     cmpw    cr7,r25,r9
    c000000000456050:       20 02 9e 41     beq     cr7,c000000000456270 <__kmalloc_node+0x330>

The panic occurred in slab_alloc_node() when checking for the page's node:

	object = c->freelist;
	page = c->page;
	if (unlikely(!object || !node_match(page, node))) {
		object = __slab_alloc(s, gfpflags, node, addr, c);
		stat(s, ALLOC_SLOWPATH);

The issue is that object is not NULL while page is NULL which is odd but
may happen if the cache flush happened after loading object but before
loading page.  Thus checking for the page pointer is required too.

The cache flush is done through an inter processor interrupt when a
piece of memory is off-lined.  That interrupt is triggered when a memory
hot-unplug operation is initiated and offline_pages() is calling the
slub's MEM_GOING_OFFLINE callback slab_mem_going_offline_callback()
which is calling flush_cpu_slab().  If that interrupt is caught between
the reading of c->freelist and the reading of c->page, this could lead
to such a situation.  That situation is expected and the later call to
this_cpu_cmpxchg_double() will detect the change to c->freelist and redo
the whole operation.

In commit 6159d0f5 ("mm/slub.c: page is always non-NULL in
node_match()") check on the page pointer has been removed assuming that
page is always valid when it is called.  It happens that this is not
true in that particular case, so check for page before calling
node_match() here.

Fixes: 6159d0f5 ("mm/slub.c: page is always non-NULL in node_match()")
Signed-off-by: default avatarLaurent Dufour <ldufour@linux.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Acked-by: default avatarChristoph Lameter <cl@linux.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Nathan Lynch <nathanl@linux.ibm.com>
Cc: Scott Cheloha <cheloha@linux.ibm.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20201027190406.33283-1-ldufour@linux.ibm.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      22e4663e
    • Dmitry Baryshkov's avatar
      mailmap: fix entry for Dmitry Baryshkov/Eremin-Solenikov · 044747e9
      Dmitry Baryshkov authored 
      Change back surname to new (old) one.  Dmitry Baryshkov -> Dmitry
Eremin-Solenikov -> Dmitry Baryshkov.  Map several odd entries to main
identity.
Signed-off-by: default avatarDmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Link: https://lkml.kernel.org/r/20201103005158.1181426-1-dmitry.baryshkov@linaro.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      044747e9
    • Nicholas Piggin's avatar
      mm/vmscan: fix NR_ISOLATED_FILE corruption on 64-bit · 2da9f630
      Nicholas Piggin authored 
      Previously the negated unsigned long would be cast back to signed long
which would have the correct negative value.  After commit 730ec8c0
("mm/vmscan.c: change prototype for shrink_page_list"), the large
unsigned int converts to a large positive signed long.

Symptoms include CMA allocations hanging forever holding the cma_mutex
due to alloc_contig_range->...->isolate_migratepages_block waiting
forever in "while (unlikely(too_many_isolated(pgdat)))".

[akpm@linux-foundation.org: fix -stat.nr_lazyfree_fail as well, per Michal]

Fixes: 730ec8c0 ("mm/vmscan.c: change prototype for shrink_page_list")
Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Cc: Vaneet Narang <v.narang@samsung.com>
Cc: Maninder Singh <maninder1.s@samsung.com>
Cc: Amit Sahrawat <a.sahrawat@samsung.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20201029032320.1448441-1-npiggin@gmail.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      2da9f630
    • Zi Yan's avatar
      mm/compaction: stop isolation if too many pages are isolated and we have pages to migrate · d20bdd57
      Zi Yan authored 
      In isolate_migratepages_block, if we have too many isolated pages and
nr_migratepages is not zero, we should try to migrate what we have
without wasting time on isolating.

In theory it's possible that multiple parallel compactions will cause
too_many_isolated() to become true even if each has isolated less than
COMPACT_CLUSTER_MAX, and loop forever in the while loop.  Bailing
immediately prevents that.

[vbabka@suse.cz: changelog addition]

Fixes: 1da2f328 (“mm,thp,compaction,cma: allow THP migration for CMA allocations”)
Suggested-by: default avatarVlastimil Babka <vbabka@suse.cz>
Signed-off-by: default avatarZi Yan <ziy@nvidia.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Cc: <stable@vger.kernel.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Yang Shi <shy828301@gmail.com>
Link: https://lkml.kernel.org/r/20201030183809.3616803-2-zi.yan@sent.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d20bdd57
    • Zi Yan's avatar
      mm/compaction: count pages and stop correctly during page isolation · 38935861
      Zi Yan authored 
      In isolate_migratepages_block, when cc->alloc_contig is true, we are
able to isolate compound pages.  But nr_migratepages and nr_isolated did
not count compound pages correctly, causing us to isolate more pages
than we thought.

So count compound pages as the number of base pages they contain.
Otherwise, we might be trapped in too_many_isolated while loop, since
the actual isolated pages can go up to COMPACT_CLUSTER_MAX*512=16384,
where COMPACT_CLUSTER_MAX is 32, since we stop isolation after
cc->nr_migratepages reaches to COMPACT_CLUSTER_MAX.

In addition, after we fix the issue above, cc->nr_migratepages could
never be equal to COMPACT_CLUSTER_MAX if compound pages are isolated,
thus page isolation could not stop as we intended.  Change the isolation
stop condition to '>='.

The issue can be triggered as follows:

In a system with 16GB memory and an 8GB CMA region reserved by
hugetlb_cma, if we first allocate 10GB THPs and mlock them (so some THPs
are allocated in the CMA region and mlocked), reserving 6 1GB hugetlb
pages via /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages will
get stuck (looping in too_many_isolated function) until we kill either
task.  With the patch applied, oom will kill the application with 10GB
THPs and let hugetlb page reservation finish.

[ziy@nvidia.com: v3]

Link: https://lkml.kernel.org/r/20201030183809.3616803-1-zi.yan@sent.com
Fixes: 1da2f328 ("cmm,thp,compaction,cma: allow THP migration for CMA allocations")
Signed-off-by: default avatarZi Yan <ziy@nvidia.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: default avatarYang Shi <shy828301@gmail.com>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Cc: Rik van Riel <riel@surriel.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20201029200435.3386066-1-zi.yan@sent.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      38935861
  3. 13 Nov, 2020 27 commits
  5. 12 Nov, 2020 8 commits
    • Linus Torvalds's avatar
      Merge tag 'net-5.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net · db7c9535
      Linus Torvalds authored 
      Pull networking fixes from Jakub Kicinski:
 "Current release - regressions:

   - arm64: dts: fsl-ls1028a-kontron-sl28: specify in-band mode for
     ENETC

  Current release - bugs in new features:

   - mptcp: provide rmem[0] limit offset to fix oops

  Previous release - regressions:

   - IPv6: Set SIT tunnel hard_header_len to zero to fix path MTU
     calculations

   - lan743x: correctly handle chips with internal PHY

   - bpf: Don't rely on GCC __attribute__((optimize)) to disable GCSE

   - mlx5e: Fix VXLAN port table synchronization after function reload

  Previous release - always broken:

   - bpf: Zero-fill re-used per-cpu map element

   - fix out-of-order UDP packets when forwarding with UDP GSO fraglists
     turned on:
       - fix UDP header access on Fast/frag0 UDP GRO
       - fix IP header access and skb lookup on Fast/frag0 UDP GRO

   - ethtool: netlink: add missing netdev_features_change() call

   - net: Update window_clamp if SOCK_RCVBUF is set

   - igc: Fix returning wrong statistics

   - ch_ktls: fix multiple leaks and corner cases in Chelsio TLS offload

   - tunnels: Fix off-by-one in lower MTU bounds for ICMP/ICMPv6 replies

   - r8169: disable hw csum for short packets on all chip versions

   - vrf: Fix fast path output packet handling with async Netfilter
     rules"

* tag 'net-5.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (65 commits)
  lan743x: fix use of uninitialized variable
  net: udp: fix IP header access and skb lookup on Fast/frag0 UDP GRO
  net: udp: fix UDP header access on Fast/frag0 UDP GRO
  devlink: Avoid overwriting port attributes of registered port
  vrf: Fix fast path output packet handling with async Netfilter rules
  cosa: Add missing kfree in error path of cosa_write
  net: switch to the kernel.org patchwork instance
  ch_ktls: stop the txq if reaches threshold
  ch_ktls: tcb update fails sometimes
  ch_ktls/cxgb4: handle partial tag alone SKBs
  ch_ktls: don't free skb before sending FIN
  ch_ktls: packet handling prior to start marker
  ch_ktls: Correction in middle record handling
  ch_ktls: missing handling of header alone
  ch_ktls: Correction in trimmed_len calculation
  cxgb4/ch_ktls: creating skbs causes panic
  ch_ktls: Update cheksum information
  ch_ktls: Correction in finding correct length
  cxgb4/ch_ktls: decrypted bit is not enough
  net/x25: Fix null-ptr-deref in x25_connect
  ...
      db7c9535
    • Linus Torvalds's avatar
      Merge tag 'nfs-for-5.10-2' of git://git.linux-nfs.org/projects/anna/linux-nfs · 200f9d21
      Linus Torvalds authored 
      Pull NFS client bugfixes from Anna Schumaker:
 "Stable fixes:
  - Fix failure to unregister shrinker

  Other fixes:
  - Fix unnecessary locking to clear up some contention
  - Fix listxattr receive buffer size
  - Fix default mount options for nfsroot"

* tag 'nfs-for-5.10-2' of git://git.linux-nfs.org/projects/anna/linux-nfs:
  NFS: Remove unnecessary inode lock in nfs_fsync_dir()
  NFS: Remove unnecessary inode locking in nfs_llseek_dir()
  NFS: Fix listxattr receive buffer size
  NFSv4.2: fix failure to unregister shrinker
  nfsroot: Default mount option should ask for built-in NFS version
      200f9d21
    • Linus Torvalds's avatar
      Merge tag 'acpi-5.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · af5043c8
      Linus Torvalds authored 
      Pull ACPI fixes from Rafael Wysocki:
 "These are mostly docmentation fixes and janitorial changes plus some
  new device IDs and a new quirk.

  Specifics:

   - Fix documentation regarding GPIO properties (Andy Shevchenko)

   - Fix spelling mistakes in ACPI documentation (Flavio Suligoi)

   - Fix white space inconsistencies in ACPI code (Maximilian Luz)

   - Fix string formatting in the ACPI Generic Event Device (GED) driver
     (Nick Desaulniers)

   - Add Intel Alder Lake device IDs to the ACPI drivers used by the
     Dynamic Platform and Thermal Framework (Srinivas Pandruvada)

   - Add lid-related DMI quirk for Medion Akoya E2228T to the ACPI
     button driver (Hans de Goede)"

* tag 'acpi-5.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: DPTF: Support Alder Lake
  Documentation: ACPI: fix spelling mistakes
  ACPI: button: Add DMI quirk for Medion Akoya E2228T
  ACPI: GED: fix -Wformat
  ACPI: Fix whitespace inconsistencies
  ACPI: scan: Fix acpi_dma_configure_id() kerneldoc name
  Documentation: firmware-guide: gpio-properties: Clarify initial output state
  Documentation: firmware-guide: gpio-properties: active_low only for GpioIo()
  Documentation: firmware-guide: gpio-properties: Fix factual mistakes
      af5043c8
    • Linus Torvalds's avatar
      Merge tag 'pm-5.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · fcfb6791
      Linus Torvalds authored 
      Pull power management fixes from Rafael Wysocki:
 "Make the intel_pstate driver behave as expected when it operates in
  the passive mode with HWP enabled and the 'powersave' governor on top
  of it"

* tag 'pm-5.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq: intel_pstate: Take CPUFREQ_GOV_STRICT_TARGET into account
  cpufreq: Add strict_target to struct cpufreq_policy
  cpufreq: Introduce CPUFREQ_GOV_STRICT_TARGET
  cpufreq: Introduce governor flags
      fcfb6791
    • Sven Van Asbroeck's avatar
      lan743x: fix use of uninitialized variable · edbc2111
      Sven Van Asbroeck authored 
      When no devicetree is present, the driver will use an
uninitialized variable.

Fix by initializing this variable.

Fixes: 902a66e0 ("lan743x: correctly handle chips with internal PHY")
Reported-by: default avatarkernel test robot <lkp@intel.com>
Signed-off-by: default avatarSven Van Asbroeck <thesven73@gmail.com>
Link: https://lore.kernel.org/r/20201112152513.1941-1-TheSven73@gmail.comSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      edbc2111
    • Jakub Kicinski's avatar
      Merge branch 'net-udp-fix-fast-frag0-udp-gro' · 5861c8cb
      Jakub Kicinski authored 
      Alexander Lobakin says:

====================
net: udp: fix Fast/frag0 UDP GRO

While testing UDP GSO fraglists forwarding through driver that uses
Fast GRO (via napi_gro_frags()), I was observing lots of out-of-order
iperf packets:

[ ID] Interval           Transfer     Bitrate         Jitter
[SUM]  0.0-40.0 sec  12106 datagrams received out-of-order

Simple switch to napi_gro_receive() or any other method without frag0
shortcut completely resolved them.

I've found two incorrect header accesses in GRO receive callback(s):
 - udp_hdr() (instead of udp_gro_udphdr()) that always points to junk
   in "fast" mode and could probably do this in "regular".
   This was the actual bug that caused all out-of-order delivers;
 - udp{4,6}_lib_lookup_skb() -> ip{,v6}_hdr() (instead of
   skb_gro_network_header()) that potentionally might return odd
   pointers in both modes.

Each patch addresses one of these two issues.

This doesn't cover a support for nested tunnels as it's out of the
subject and requires more invasive changes. It will be handled
separately in net-next series.

Credits:
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Willem de Bruijn <willemb@google.com>

Since v4 [0]:
 - split the fix into two logical ones (Willem);
 - replace ternaries with plain ifs to beautify the code (Jakub);
 - drop p->data part to reintroduce it later in abovementioned set.

Since v3 [1]:
 - restore the original {,__}udp{4,6}_lib_lookup_skb() and use
   private versions of them inside GRO code (Willem).

Since v2 [2]:
 - dropped redundant check introduced in v2 as it's performed right
   before (thanks to Eric);
 - udp_hdr() switched to data + off for skbs from list (also Eric);
 - fixed possible malfunction of {,__}udp{4,6}_lib_lookup_skb() with
   Fast/frag0 due to ip{,v6}_hdr() usage (Willem).

Since v1 [3]:
 - added a NULL pointer check for "uh" as suggested by Willem.

[0] https://lore.kernel.org/netdev/Ha2hou5eJPcblo4abjAqxZRzIl1RaLs2Hy0oOAgFs@cp4-web-036.plabs.ch
[1] https://lore.kernel.org/netdev/MgZce9htmEtCtHg7pmWxXXfdhmQ6AHrnltXC41zOoo@cp7-web-042.plabs.ch
[2] https://lore.kernel.org/netdev/0eaG8xtbtKY1dEKCTKUBubGiC9QawGgB3tVZtNqVdY@cp4-web-030.plabs.ch
[3] https://lore.kernel.org/netdev/YazU6GEzBdpyZMDMwJirxDX7B4sualpDG68ADZYvJI@cp4-web-034.plabs.ch
====================

Link: https://lore.kernel.org/r/hjGOh0iCOYyo1FPiZh6TMXcx3YCgNs1T1eGKLrDz8@cp4-web-037.plabs.chSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      5861c8cb
    • Alexander Lobakin's avatar
      net: udp: fix IP header access and skb lookup on Fast/frag0 UDP GRO · 55e72988
      Alexander Lobakin authored 
      udp{4,6}_lib_lookup_skb() use ip{,v6}_hdr() to get IP header of the
packet. While it's probably OK for non-frag0 paths, this helpers
will also point to junk on Fast/frag0 GRO when all headers are
located in frags. As a result, sk/skb lookup may fail or give wrong
results. To support both GRO modes, skb_gro_network_header() might
be used. To not modify original functions, add private versions of
udp{4,6}_lib_lookup_skb() only to perform correct sk lookups on GRO.

Present since the introduction of "application-level" UDP GRO
in 4.7-rc1.

Misc: replace totally unneeded ternaries with plain ifs.

Fixes: a6024562 ("udp: Add GRO functions to UDP socket")
Suggested-by: default avatarWillem de Bruijn <willemb@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: default avatarAlexander Lobakin <alobakin@pm.me>
Acked-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      55e72988
    • Alexander Lobakin's avatar
      net: udp: fix UDP header access on Fast/frag0 UDP GRO · 4b1a8628
      Alexander Lobakin authored 
      UDP GRO uses udp_hdr(skb) in its .gro_receive() callback. While it's
probably OK for non-frag0 paths (when all headers or even the entire
frame are already in skb head), this inline points to junk when
using Fast GRO (napi_gro_frags() or napi_gro_receive() with only
Ethernet header in skb head and all the rest in the frags) and breaks
GRO packet compilation and the packet flow itself.
To support both modes, skb_gro_header_fast() + skb_gro_header_slow()
are typically used. UDP even has an inline helper that makes use of
them, udp_gro_udphdr(). Use that instead of troublemaking udp_hdr()
to get rid of the out-of-order delivers.

Present since the introduction of plain UDP GRO in 5.0-rc1.

Fixes: e20cf8d3 ("udp: implement GRO for plain UDP sockets.")
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: default avatarAlexander Lobakin <alobakin@pm.me>
Acked-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      4b1a8628
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