- 17 Nov, 2017 6 commits
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Chuck Lever authored
Clean up. rpcrdma_prepare_hdr_sge() sets num_sge to one, then rpcrdma_prepare_msg_sges() sets num_sge again to the count of SGEs it added, plus one for the header SGE just mapped in rpcrdma_prepare_hdr_sge(). This is confusing, and nails in an assumption about when these functions are called. Instead, maintain a running count that both functions can update with just the number of SGEs they have added to the SGE array. Signed-off-by:
Chuck Lever <chuck.lever@oracle.com> Signed-off-by:
Anna Schumaker <Anna.Schumaker@Netapp.com>
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Chuck Lever authored
We need to decode and save the incoming rdma_credits field _after_ we know that the direction of the message is "forward direction Reply". Otherwise, the credits value in reverse direction Calls is also used to update the forward direction credits. It is safe to decode the rdma_credits field in rpcrdma_reply_handler now that rpcrdma_reply_handler is single-threaded. Receives complete in the same order as they were sent on the NFS server. Signed-off-by:
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Chuck Lever authored
I noticed that the soft IRQ thread looked pretty busy under heavy I/O workloads. perf suggested one area that was expensive was the queue_work() call in rpcrdma_wc_receive. That gave me some ideas. Instead of scheduling a separate worker to process RPC Replies, promote the Receive completion handler to IB_POLL_WORKQUEUE, and invoke rpcrdma_reply_handler directly. Note that the poll workqueue is single-threaded. In order to keep memory invalidation from serializing all RPC Replies, handle any necessary invalidation tasks in a separate multi-threaded workqueue. This provides a two-tier scheme, similar to OS I/O interrupt handlers: A fast interrupt handler that schedules the slow handler and re-enables the interrupt, and a slower handler that is invoked for any needed heavy lifting. Benefits include: - One less context switch for RPCs that don't register memory - Receive completion handling is moved out of soft IRQ context to make room for other users of soft IRQ - The same CPU core now DMA syncs and XDR decodes the Receive buffer Signed-off-by:
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Chuck Lever authored
Clean up: I'd like to be able to invoke the tail of rpcrdma_reply_handler in two different places. Split the tail out into its own helper function. Signed-off-by:
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Chuck Lever authored
Clean up: Make it easier to pass the decoded XID, vers, credits, and proc fields around by moving these variables into struct rpcrdma_rep. Note: the credits field will be handled in a subsequent patch. Signed-off-by:
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Chuck Lever authored
A reply with an unrecognized value in the version field means the transport header is potentially garbled and therefore all the fields are untrustworthy. Fixes: 59aa1f9a ("xprtrdma: Properly handle RDMA_ERROR ... ") Signed-off-by:
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- 16 Oct, 2017 8 commits
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Chuck Lever authored
Clean up: There are no remaining callers of this method. Signed-off-by:
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Chuck Lever authored
The "safe" version of ro_unmap is used here to avoid waiting unnecessarily. However: - It is safe to wait. After all, we have to wait anyway when using FMR to register memory. - This case is rare: it occurs only after a reconnect. By switching this call site to ro_unmap_sync, the final use of ro_unmap_safe is removed. Signed-off-by:
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Chuck Lever authored
In current kernels, waiting in xprt_release appears to be safe to do. I had erroneously believed that for ASYNC RPCs, waiting of any kind in xprt_release->xprt_rdma_free would result in deadlock. I've done injection testing and consulted with Trond to confirm that waiting in the RPC release path is safe. For the very few times where RPC resources haven't yet been released earlier by the reply handler, it is safe to wait synchronously in xprt_rdma_free for invalidation rather than defering it to MR recovery. Note: When the QP is error state, posting a LocalInvalidate should flush and mark the MR as bad. There is no way the remote HCA can access that MR via a QP in error state, so it is effectively already inaccessible and thus safe for the Upper Layer to access. The next time the MR is used it should be recognized and cleaned up properly by frwr_op_map. Signed-off-by:
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NeilBrown authored
Commit f5a73672 ("NFS: allow close-to-open cache semantics to apply to root of NFS filesystem") added a call to __nfs_revalidate_inode() to nfs_opendir to as the lookup process wouldn't reliable do this. Subsequent commit a3fbbde7 ("VFS: we need to set LOOKUP_JUMPED on mountpoint crossing") make this unnecessary. So remove the unnecessary code. Signed-off-by:
NeilBrown <neilb@suse.com> Signed-off-by:
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NeilBrown authored
For correct close-to-open semantics, NFS must validate the change attribute of a directory (or file) on open. Since commit ecf3d1f1 ("vfs: kill FS_REVAL_DOT by adding a d_weak_revalidate dentry op"), open() of "." or a path ending ".." is not revalidated reliably (except when that direct is a mount point). Prior to that commit, "." was revalidated using nfs_lookup_revalidate() which checks the LOOKUP_OPEN flag and forces revalidation if the flag is set. Since that commit, nfs_weak_revalidate() is used for NFSv3 (which ignores the flags) and nothing is used for NFSv4. This is fixed by using nfs_lookup_verify_inode() in nfs_weak_revalidate(). This does the revalidation exactly when needed. Also, add a definition of .d_weak_revalidate for NFSv4. The incorrect behavior is easily demonstrated by running "echo *" in some non-mountpoint NFS directory while watching network traffic. Without this patch, "echo *" sometimes doesn't produce any traffic. With the patch it always does. Fixes: ecf3d1f1 ("vfs: kill FS_REVAL_DOT by adding a d_weak_revalidate dentry op") cc: stable@vger.kernel.org (3.9+) Signed-off-by:
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Anna Schumaker authored
The NFS_ACCESS_* flags aren't a 1:1 mapping to the MAY_* flags, so checking for MAY_WHATEVER might have surprising results in nfs*_proc_access(). Let's simplify this check when determining which bits to ask for, and do it in a generic place instead of copying code for each NFS version. Signed-off-by: -
Anna Schumaker authored
Passing the NFS v4 flags into the v3 code seems weird to me, even if they are defined to the same values. This patch adds in generic flags to help me feel better Signed-off-by: -
Linus Torvalds authored
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- 15 Oct, 2017 3 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-miscLinus Torvalds authored
Pull char/misc driver fixes from Greg KH: "Here are 4 patches to resolve some char/misc driver issues found these past weeks. One of them is a mei bugfix and another is a new mei device id. There is also a hyper-v fix for a reported issue, and a binder issue fix for a problem reported by a few people. All of these have been in my tree for a while, I don't know if linux-next is really testing much this month. But 0-day is happy with them :)" * tag 'char-misc-4.14-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: binder: fix use-after-free in binder_transaction() Drivers: hv: vmbus: Fix bugs in rescind handling mei: me: add gemini lake devices id mei: always use domain runtime pm callbacks.
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usbLinus Torvalds authored
Pull USB fixes from Greg KH: "Here are a handful of USB driver fixes for 4.14-rc5. There is the "usual" usb-serial fixes and device ids, USB gadget fixes, and some more fixes found by the fuzz testing that is happening on the USB layer right now. All of these have been in my tree this week with no reported issues" * tag 'usb-4.14-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: usb: usbtest: fix NULL pointer dereference usb: gadget: configfs: Fix memory leak of interface directory data usb: gadget: composite: Fix use-after-free in usb_composite_overwrite_options usb: misc: usbtest: Fix overflow in usbtest_do_ioctl() usb: renesas_usbhs: Fix DMAC sequence for receiving zero-length packet USB: dummy-hcd: Fix deadlock caused by disconnect detection usb: phy: tegra: Fix phy suspend for UDC USB: serial: console: fix use-after-free after failed setup USB: serial: console: fix use-after-free on disconnect USB: serial: qcserial: add Dell DW5818, DW5819 USB: serial: cp210x: add support for ELV TFD500 USB: serial: cp210x: fix partnum regression USB: serial: option: add support for TP-Link LTE module USB: serial: ftdi_sio: add id for Cypress WICED dev board
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git://git.infradead.org/users/vkoul/slave-dmaLinus Torvalds authored
Pull dmaengine fixes from Vinod Koul: "Here are fixes for this round - fix spinlock usage amd fifo response for altera driver - fix ti crossbar race condition - fix edma memcpy align" * tag 'dmaengine-fix-4.14-rc5' of git://git.infradead.org/users/vkoul/slave-dma: dmaengine: altera: fix spinlock usage dmaengine: altera: fix response FIFO emptying dmaengine: ti-dma-crossbar: Fix possible race condition with dma_inuse dmaengine: edma: Align the memcpy acnt array size with the transfer
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- 14 Oct, 2017 12 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 fixes from Ingo Molnar: "A landry list of fixes: - fix reboot breakage on some PCID-enabled system - fix crashes/hangs on some PCID-enabled systems - fix microcode loading on certain older CPUs - various unwinder fixes - extend an APIC quirk to more hardware systems and disable APIC related warning on virtualized systems - various Hyper-V fixes - a macro definition robustness fix - remove jprobes IRQ disabling - various mem-encryption fixes" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/microcode: Do the family check first x86/mm: Flush more aggressively in lazy TLB mode x86/apic: Update TSC_DEADLINE quirk with additional SKX stepping x86/apic: Silence "FW_BUG TSC_DEADLINE disabled due to Errata" on hypervisors x86/mm: Disable various instrumentations of mm/mem_encrypt.c and mm/tlb.c x86/hyperv: Fix hypercalls with extended CPU ranges for TLB flushing x86/hyperv: Don't use percpu areas for pcpu_flush/pcpu_flush_ex structures x86/hyperv: Clear vCPU banks between calls to avoid flushing unneeded vCPUs x86/unwind: Disable unwinder warnings on 32-bit x86/unwind: Align stack pointer in unwinder dump x86/unwind: Use MSB for frame pointer encoding on 32-bit x86/unwind: Fix dereference of untrusted pointer x86/alternatives: Fix alt_max_short macro to really be a max() x86/mm/64: Fix reboot interaction with CR4.PCIDE kprobes/x86: Remove IRQ disabling from jprobe handlers kprobes/x86: Set up frame pointer in kprobe trampoline -
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull scheduler fixes from Ingo Molnar: "Three fixes that address an SMP balancing performance regression" * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/core: Ensure load_balance() respects the active_mask sched/core: Address more wake_affine() regressions sched/core: Fix wake_affine() performance regression
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull RAS fixes from Ingo Molnar: "A boot parameter fix, plus a header export fix" * 'ras-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mce: Hide mca_cfg RAS/CEC: Use the right length for "cec_disable"
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull perf fixes from Ingo Molnar: "Some tooling fixes plus three kernel fixes: a memory leak fix, a statistics fix and a crash fix" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/x86/intel/uncore: Fix memory leaks on allocation failures perf/core: Fix cgroup time when scheduling descendants perf/core: Avoid freeing static PMU contexts when PMU is unregistered tools include uapi bpf.h: Sync kernel ABI header with tooling header perf pmu: Unbreak perf record for arm/arm64 with events with explicit PMU perf script: Add missing separator for "-F ip,brstack" (and brstackoff) perf callchain: Compare dsos (as well) for CCKEY_FUNCTION
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull locking fixes from Ingo Molnar: "Two lockdep fixes for bugs introduced by the cross-release dependency tracking feature - plus a commit that disables it because performance regressed in an absymal fashion on some systems" * 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: locking/lockdep: Disable cross-release features for now locking/selftest: Avoid false BUG report locking/lockdep: Fix stacktrace mess
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull irq fixes from Ingo Molnar: "A CPU hotplug related fix, plus two related sanity checks" * 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: genirq/cpuhotplug: Enforce affinity setting on startup of managed irqs genirq/cpuhotplug: Add sanity check for effective affinity mask genirq: Warn when effective affinity is not updated
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull objtool fix from Ingo Molnar: "A single objtool fix: avoid silently broken ORC debuginfo builds and error out instead" * 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: objtool: Upgrade libelf-devel warning to error for CONFIG_ORC_UNWINDER
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Borislav Petkov authored
On CPUs like AMD's Geode, for example, we shouldn't even try to load microcode because they do not support the modern microcode loading interface. However, we do the family check *after* the other checks whether the loader has been disabled on the command line or whether we're running in a guest. So move the family checks first in order to exit early if we're being loaded on an unsupported family. Reported-and-tested-by:
Sven Glodowski <glodi1@arcor.de> Signed-off-by:
Borislav Petkov <bp@suse.de> Cc: <stable@vger.kernel.org> # 4.11.. Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://bugzilla.suse.com/show_bug.cgi?id=1061396 Link: http://lkml.kernel.org/r/20171012112316.977-1-bp@alien8.deSigned-off-by:
Ingo Molnar <mingo@kernel.org>
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Ingo Molnar authored
Johan Hovold reported a big lockdep slowdown on his system, caused by lockdep: > I had noticed that the BeagleBone Black boot time appeared to have > increased significantly with 4.14 and yesterday I finally had time to > investigate it. > > Boot time (from "Linux version" to login prompt) had in fact doubled > since 4.13 where it took 17 seconds (with my current config) compared to > the 35 seconds I now see with 4.14-rc4. > > I quick bisect pointed to lockdep and specifically the following commit: > > 28a903f6 ("locking/lockdep: Handle non(or multi)-acquisition of a crosslock") Because the final v4.14 release is close, disable the cross-release lockdep features for now. Bisected-by:
Johan Hovold <johan@kernel.org> Debugged-by:
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git://git.linux-mips.org/pub/scm/ralf/upstream-linusLinus Torvalds authored
Pull MIPS fixes from Ralf Baechle: "More MIPS fixes for 4.14: - Loongson 1: Set the default number of RX and TX queues to accomodate for recent changes of stmmac driver. - BPF: Fix uninitialised target compiler error. - Fix cmpxchg on 32 bit signed ints for 64 bit kernels with !kernel_uses_llsc - Fix generic-board-config.sh for builds using O= - Remove pr_err() calls from fpu_emu() for a case which is not a kernel error" * '4.14-fixes' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: MIPS: math-emu: Remove pr_err() calls from fpu_emu() MIPS: Fix generic-board-config.sh for builds using O= MIPS: Fix cmpxchg on 32b signed ints for 64b kernel with !kernel_uses_llsc MIPS: loongson1: set default number of rx and tx queues for stmmac MIPS: bpf: Fix uninitialised target compiler error -
Andy Lutomirski authored
Since commit: 94b1b03b ("x86/mm: Rework lazy TLB mode and TLB freshness tracking") x86's lazy TLB mode has been all the way lazy: when running a kernel thread (including the idle thread), the kernel keeps using the last user mm's page tables without attempting to maintain user TLB coherence at all. From a pure semantic perspective, this is fine -- kernel threads won't attempt to access user pages, so having stale TLB entries doesn't matter. Unfortunately, I forgot about a subtlety. By skipping TLB flushes, we also allow any paging-structure caches that may exist on the CPU to become incoherent. This means that we can have a paging-structure cache entry that references a freed page table, and the CPU is within its rights to do a speculative page walk starting at the freed page table. I can imagine this causing two different problems: - A speculative page walk starting from a bogus page table could read IO addresses. I haven't seen any reports of this causing problems. - A speculative page walk that involves a bogus page table can install garbage in the TLB. Such garbage would always be at a user VA, but some AMD CPUs have logic that triggers a machine check when it notices these bogus entries. I've seen a couple reports of this. Boris further explains the failure mode: > It is actually more of an optimization which assumes that paging-structure > entries are in WB DRAM: > > "TlbCacheDis: cacheable memory disable. Read-write. 0=Enables > performance optimization that assumes PML4, PDP, PDE, and PTE entries > are in cacheable WB-DRAM; memory type checks may be bypassed, and > addresses outside of WB-DRAM may result in undefined behavior or NB > protocol errors. 1=Disables performance optimization and allows PML4, > PDP, PDE and PTE entries to be in any memory type. Operating systems > that maintain page tables in memory types other than WB- DRAM must set > TlbCacheDis to insure proper operation." > > The MCE generated is an NB protocol error to signal that > > "Link: A specific coherent-only packet from a CPU was issued to an > IO link. This may be caused by software which addresses page table > structures in a memory type other than cacheable WB-DRAM without > properly configuring MSRC001_0015[TlbCacheDis]. This may occur, for > example, when page table structure addresses are above top of memory. In > such cases, the NB will generate an MCE if it sees a mismatch between > the memory operation generated by the core and the link type." > > I'm assuming coherent-only packets don't go out on IO links, thus the > error. To fix this, reinstate TLB coherence in lazy mode. With this patch applied, we do it in one of two ways: - If we have PCID, we simply switch back to init_mm's page tables when we enter a kernel thread -- this seems to be quite cheap except for the cost of serializing the CPU. - If we don't have PCID, then we set a flag and switch to init_mm the first time we would otherwise need to flush the TLB. The /sys/kernel/debug/x86/tlb_use_lazy_mode debug switch can be changed to override the default mode for benchmarking. In theory, we could optimize this better by only flushing the TLB in lazy CPUs when a page table is freed. Doing that would require auditing the mm code to make sure that all page table freeing goes through tlb_remove_page() as well as reworking some data structures to implement the improved flush logic. Reported-by:
Markus Trippelsdorf <markus@trippelsdorf.de> Reported-by:
Adam Borowski <kilobyte@angband.pl> Signed-off-by:
Andy Lutomirski <luto@kernel.org> Signed-off-by:
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git://people.freedesktop.org/~airlied/linuxLinus Torvalds authored
Pull drm fixes from Dave Airlie: "Couple of the arm people seem to wake up so this has imx and msm fixes, along with a bunch of i915 stable bounds fixes and an amdgpu regression fix. All seems pretty okay for now" * tag 'drm-fixes-for-v4.14-rc5' of git://people.freedesktop.org/~airlied/linux: drm/msm: fix _NO_IMPLICIT fencing case drm/msm: fix error path cleanup drm/msm/mdp5: Remove extra pm_runtime_put call in mdp5_crtc_cursor_set() drm/msm/dsi: Use correct pm_runtime_put variant during host_init drm/msm: fix return value check in _msm_gem_kernel_new() drm/msm: use proper memory barriers for updating tail/head drm/msm/mdp5: add missing max size for 8x74 v1 drm/amdgpu: fix placement flags in amdgpu_ttm_bind drm/i915/bios: parse DDI ports also for CHV for HDMI DDC pin and DP AUX channel gpu: ipu-v3: pre: implement workaround for ERR009624 gpu: ipu-v3: prg: wait for double buffers to be filled on channel startup gpu: ipu-v3: Allow channel burst locking on i.MX6 only drm/i915: Read timings from the correct transcoder in intel_crtc_mode_get() drm/i915: Order two completing nop_submit_request drm/i915: Silence compiler warning for hsw_power_well_enable() drm/i915: Use crtc_state_is_legacy_gamma in intel_color_check drm/i915/edp: Increase the T12 delay quirk to 1300ms drm/i915/edp: Get the Panel Power Off timestamp after panel is off sync_file: Return consistent status in SYNC_IOC_FILE_INFO drm/atomic: Unref duplicated drm_atomic_state in drm_atomic_helper_resume()
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- 13 Oct, 2017 11 commits
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Dave Airlie authored
Merge tag 'drm-intel-fixes-2017-10-11' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes drm/i915 fixes for 4.14-rc5: Three fixes for stable: - Use crtc_state_is_legacy_gamma in intel_color_check (Maarten) - Read timings from the correct transcoder (Ville). - Fix HDMI on BSW (Jani). Other fixes: - eDP fixes (Manasi) - Silence compiler warnings (Chris) - Order two completing nop_submit_request (Chris) * tag 'drm-intel-fixes-2017-10-11' of git://anongit.freedesktop.org/drm/drm-intel: drm/i915/bios: parse DDI ports also for CHV for HDMI DDC pin and DP AUX channel drm/i915: Read timings from the correct transcoder in intel_crtc_mode_get() drm/i915: Order two completing nop_submit_request drm/i915: Silence compiler warning for hsw_power_well_enable() drm/i915: Use crtc_state_is_legacy_gamma in intel_color_check drm/i915/edp: Increase the T12 delay quirk to 1300ms drm/i915/edp: Get the Panel Power Off timestamp after panel is off
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git://people.freedesktop.org/~robclark/linuxDave Airlie authored
bunch of msm fixes * 'msm-fixes-4.14-rc4' of git://people.freedesktop.org/~robclark/linux: drm/msm: fix _NO_IMPLICIT fencing case drm/msm: fix error path cleanup drm/msm/mdp5: Remove extra pm_runtime_put call in mdp5_crtc_cursor_set() drm/msm/dsi: Use correct pm_runtime_put variant during host_init drm/msm: fix return value check in _msm_gem_kernel_new() drm/msm: use proper memory barriers for updating tail/head drm/msm/mdp5: add missing max size for 8x74 v1
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Linus Torvalds authored
Merge misc fixes from Andrew Morton: "18 fixes" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: mm, swap: use page-cluster as max window of VMA based swap readahead mm: page_vma_mapped: ensure pmd is loaded with READ_ONCE outside of lock kmemleak: clear stale pointers from task stacks fs/binfmt_misc.c: node could be NULL when evicting inode fs/mpage.c: fix mpage_writepage() for pages with buffers linux/kernel.h: add/correct kernel-doc notation tty: fall back to N_NULL if switching to N_TTY fails during hangup Revert "vmalloc: back off when the current task is killed" mm/cma.c: take __GFP_NOWARN into account in cma_alloc() scripts/kallsyms.c: ignore symbol type 'n' userfaultfd: selftest: exercise -EEXIST only in background transfer mm: only display online cpus of the numa node mm: remove unnecessary WARN_ONCE in page_vma_mapped_walk(). mm/mempolicy: fix NUMA_INTERLEAVE_HIT counter include/linux/of.h: provide of_n_{addr,size}_cells wrappers for !CONFIG_OF mm/madvise.c: add description for MADV_WIPEONFORK and MADV_KEEPONFORK lib/Kconfig.debug: kernel hacking menu: runtime testing: keep tests together mm/migrate: fix indexing bug (off by one) and avoid out of bound access -
Huang Ying authored
When the VMA based swap readahead was introduced, a new knob /sys/kernel/mm/swap/vma_ra_max_order was added as the max window of VMA swap readahead. This is to make it possible to use different max window for VMA based readahead and original physical readahead. But Minchan Kim pointed out that this will cause a regression because setting page-cluster sysctl to zero cannot disable swap readahead with the change. To fix the regression, the page-cluster sysctl is used as the max window of both the VMA based swap readahead and original physical swap readahead. If more fine grained control is needed in the future, more knobs can be added as the subordinate knobs of the page-cluster sysctl. The vma_ra_max_order knob is deleted. Because the knob was introduced in v4.14-rc1, and this patch is targeting being merged before v4.14 releasing, there should be no existing users of this newly added ABI. Link: http://lkml.kernel.org/r/20171011070847.16003-1-ying.huang@intel.com Fixes: ec560175 ("mm, swap: VMA based swap readahead") Signed-off-by:
"Huang, Ying" <ying.huang@intel.com> Reported-by:
Minchan Kim <minchan@kernel.org> Acked-by:
Michal Hocko <mhocko@suse.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Rik van Riel <riel@redhat.com> Cc: Shaohua Li <shli@kernel.org> Cc: Hugh Dickins <hughd@google.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Tim Chen <tim.c.chen@intel.com> Cc: Dave Hansen <dave.hansen@intel.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Will Deacon authored
Loading the pmd without holding the pmd_lock exposes us to races with concurrent updaters of the page tables but, worse still, it also allows the compiler to cache the pmd value in a register and reuse it later on, even if we've performed a READ_ONCE in between and seen a more recent value. In the case of page_vma_mapped_walk, this leads to the following crash when the pmd loaded for the initial pmd_trans_huge check is all zeroes and a subsequent valid table entry is loaded by check_pmd. We then proceed into map_pte, but the compiler re-uses the zero entry inside pte_offset_map, resulting in a junk pointer being installed in pvmw->pte: PC is at check_pte+0x20/0x170 LR is at page_vma_mapped_walk+0x2e0/0x540 [...] Process doio (pid: 2463, stack limit = 0xffff00000f2e8000) Call trace: check_pte+0x20/0x170 page_vma_mapped_walk+0x2e0/0x540 page_mkclean_one+0xac/0x278 rmap_walk_file+0xf0/0x238 rmap_walk+0x64/0xa0 page_mkclean+0x90/0xa8 clear_page_dirty_for_io+0x84/0x2a8 mpage_submit_page+0x34/0x98 mpage_process_page_bufs+0x164/0x170 mpage_prepare_extent_to_map+0x134/0x2b8 ext4_writepages+0x484/0xe30 do_writepages+0x44/0xe8 __filemap_fdatawrite_range+0xbc/0x110 file_write_and_wait_range+0x48/0xd8 ext4_sync_file+0x80/0x4b8 vfs_fsync_range+0x64/0xc0 SyS_msync+0x194/0x1e8 This patch fixes the problem by ensuring that READ_ONCE is used before the initial checks on the pmd, and this value is subsequently used when checking whether or not the pmd is present. pmd_check is removed and the pmd_present check is inlined directly. Link: http://lkml.kernel.org/r/1507222630-5839-1-git-send-email-will.deacon@arm.com Fixes: f27176cf ("mm: convert page_mkclean_one() to use page_vma_mapped_walk()") Signed-off-by:Will Deacon <will.deacon@arm.com> Tested-by:
Yury Norov <ynorov@caviumnetworks.com> Tested-by:
Richard Ruigrok <rruigrok@codeaurora.org> Acked-by:
Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: <stable@vger.kernel.org> Signed-off-by:
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Konstantin Khlebnikov authored
Kmemleak considers any pointers on task stacks as references. This patch clears newly allocated and reused vmap stacks. Link: http://lkml.kernel.org/r/150728990124.744199.8403409836394318684.stgit@buzzSigned-off-by:
Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Acked-by:
Catalin Marinas <catalin.marinas@arm.com> Signed-off-by:
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Eryu Guan authored
inode->i_private is assigned by a Node pointer only after registering a new binary format, so it could be NULL if inode was created by bm_fill_super() (or iput() was called by the error path in bm_register_write()), and this could result in NULL pointer dereference when evicting such an inode. e.g. mount binfmt_misc filesystem then umount it immediately: mount -t binfmt_misc binfmt_misc /proc/sys/fs/binfmt_misc umount /proc/sys/fs/binfmt_misc will result in BUG: unable to handle kernel NULL pointer dereference at 0000000000000013 IP: bm_evict_inode+0x16/0x40 [binfmt_misc] ... Call Trace: evict+0xd3/0x1a0 iput+0x17d/0x1d0 dentry_unlink_inode+0xb9/0xf0 __dentry_kill+0xc7/0x170 shrink_dentry_list+0x122/0x280 shrink_dcache_parent+0x39/0x90 do_one_tree+0x12/0x40 shrink_dcache_for_umount+0x2d/0x90 generic_shutdown_super+0x1f/0x120 kill_litter_super+0x29/0x40 deactivate_locked_super+0x43/0x70 deactivate_super+0x45/0x60 cleanup_mnt+0x3f/0x70 __cleanup_mnt+0x12/0x20 task_work_run+0x86/0xa0 exit_to_usermode_loop+0x6d/0x99 syscall_return_slowpath+0xba/0xf0 entry_SYSCALL_64_fastpath+0xa3/0xa Fix it by making sure Node (e) is not NULL. Link: http://lkml.kernel.org/r/20171010100642.31786-1-eguan@redhat.com Fixes: 83f91827 ("exec: binfmt_misc: shift filp_close(interp_file) from kill_node() to bm_evict_inode()") Signed-off-by:
Eryu Guan <eguan@redhat.com> Acked-by:
Oleg Nesterov <oleg@redhat.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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Matthew Wilcox authored
When using FAT on a block device which supports rw_page, we can hit BUG_ON(!PageLocked(page)) in try_to_free_buffers(). This is because we call clean_buffers() after unlocking the page we've written. Introduce a new clean_page_buffers() which cleans all buffers associated with a page and call it from within bdev_write_page(). [akpm@linux-foundation.org: s/PAGE_SIZE/~0U/ per Linus and Matthew] Link: http://lkml.kernel.org/r/20171006211541.GA7409@bombadil.infradead.orgSigned-off-by:
Matthew Wilcox <mawilcox@microsoft.com> Reported-by:
Toshi Kani <toshi.kani@hpe.com> Reported-by:
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Tested-by:
Johannes Thumshirn <jthumshirn@suse.de> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: <stable@vger.kernel.org> Signed-off-by:
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Randy Dunlap authored
Add kernel-doc notation for some macros. Correct kernel-doc comments & typos for a few macros. Link: http://lkml.kernel.org/r/76fa1403-1511-be4c-e9c4-456b43edfad3@infradead.orgSigned-off-by:
Randy Dunlap <rdunlap@infradead.org> Signed-off-by:
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Johannes Weiner authored
We have seen NULL-pointer dereference crashes in tty->disc_data when the N_TTY fallback driver failed to open during hangup. The immediate cause of this open to fail has been addressed in the preceding patch to vmalloc(), but this code could be more robust. As Alan pointed out in commit 8a8dabf2 ("tty: handle the case where we cannot restore a line discipline"), the N_TTY driver, historically the safe fallback that could never fail, can indeed fail, but the surrounding code is not prepared to handle this. To avoid crashes he added a new N_NULL driver to take N_TTY's place as the last resort. Hook that fallback up to the hangup path. Update tty_ldisc_reinit() to reflect the reality that n_tty_open can indeed fail. Link: http://lkml.kernel.org/r/20171004185959.GC2136@cmpxchg.orgSigned-off-by:
Johannes Weiner <hannes@cmpxchg.org> Cc: Alan Cox <alan@llwyncelyn.cymru> Cc: Christoph Hellwig <hch@lst.de> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by:
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Johannes Weiner authored
This reverts commits 5d17a73a ("vmalloc: back off when the current task is killed") and 171012f5 ("mm: don't warn when vmalloc() fails due to a fatal signal"). Commit 5d17a73a ("vmalloc: back off when the current task is killed") made all vmalloc allocations from a signal-killed task fail. We have seen crashes in the tty driver from this, where a killed task exiting tries to switch back to N_TTY, fails n_tty_open because of the vmalloc failing, and later crashes when dereferencing tty->disc_data. Arguably, relying on a vmalloc() call to succeed in order to properly exit a task is not the most robust way of doing things. There will be a follow-up patch to the tty code to fall back to the N_NULL ldisc. But the justification to make that vmalloc() call fail like this isn't convincing, either. The patch mentions an OOM victim exhausting the memory reserves and thus deadlocking the machine. But the OOM killer is only one, improbable source of fatal signals. It doesn't make sense to fail allocations preemptively with plenty of memory in most cases. The patch doesn't mention real-life instances where vmalloc sites would exhaust memory, which makes it sound more like a theoretical issue to begin with. But just in case, the OOM access to memory reserves has been restricted on the allocator side in cd04ae1e ("mm, oom: do not rely on TIF_MEMDIE for memory reserves access"), which should take care of any theoretical concerns on that front. Revert this patch, and the follow-up that suppresses the allocation warnings when we fail the allocations due to a signal. Link: http://lkml.kernel.org/r/20171004185906.GB2136@cmpxchg.org Fixes: 171012f5 ("mm: don't warn when vmalloc() fails due to a fatal signal") Signed-off-by:
Vlastimil Babka <vbabka@suse.cz> Acked-by:
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