1. 08 Jul, 2022 9 commits
  2. 06 Jul, 2022 1 commit
  3. 03 Jul, 2022 4 commits
    • Linus Torvalds's avatar
      Linux 5.19-rc5 · 88084a3d
      Linus Torvalds authored
      88084a3d
    • Linus Torvalds's avatar
      lockref: remove unused 'lockref_get_or_lock()' function · b8d5109f
      Linus Torvalds authored
      Looking at the conditional lock acquire functions in the kernel due to
      the new sparse support (see commit 4a557a5d "sparse: introduce
      conditional lock acquire function attribute"), it became obvious that
      the lockref code has a couple of them, but they don't match the usual
      naming convention for the other ones, and their return value logic is
      also reversed.
      
      In the other very similar places, the naming pattern is '*_and_lock()'
      (eg 'atomic_put_and_lock()' and 'refcount_dec_and_lock()'), and the
      function returns true when the lock is taken.
      
      The lockref code is superficially very similar to the refcount code,
      only with the special "atomic wrt the embedded lock" semantics.  But
      instead of the '*_and_lock()' naming it uses '*_or_lock()'.
      
      And instead of returning true in case it took the lock, it returns true
      if it *didn't* take the lock.
      
      Now, arguably the reflock code is quite logical: it really is a "either
      decrement _or_ lock" kind of situation - and the return value is about
      whether the operation succeeded without any special care needed.
      
      So despite the similarities, the differences do make some sense, and
      maybe it's not worth trying to unify the different conditional locking
      primitives in this area.
      
      But while looking at this all, it did become obvious that the
      'lockref_get_or_lock()' function hasn't actually had any users for
      almost a decade.
      
      The only user it ever had was the shortlived 'd_rcu_to_refcount()'
      function, and it got removed and replaced with 'lockref_get_not_dead()'
      back in 2013 in commits 0d98439e ("vfs: use lockred 'dead' flag to
      mark unrecoverably dead dentries") and e5c832d5 ("vfs: fix dentry
      RCU to refcounting possibly sleeping dput()")
      
      In fact, that single use was removed less than a week after the whole
      function was introduced in commit b3abd802 ("lockref: add
      'lockref_get_or_lock() helper") so this function has been around for a
      decade, but only had a user for six days.
      
      Let's just put this mis-designed and unused function out of its misery.
      
      We can think about the naming and semantic oddities of the remaining
      'lockref_put_or_lock()' later, but at least that function has users.
      
      And while the naming is different and the return value doesn't match,
      that function matches the whole '{atomic,refcount}_dec_and_test()'
      pattern much better (ie the magic happens when the count goes down to
      zero, not when it is incremented from zero).
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b8d5109f
    • Linus Torvalds's avatar
      sparse: introduce conditional lock acquire function attribute · 4a557a5d
      Linus Torvalds authored
      The kernel tends to try to avoid conditional locking semantics because
      it makes it harder to think about and statically check locking rules,
      but we do have a few fundamental locking primitives that take locks
      conditionally - most obviously the 'trylock' functions.
      
      That has always been a problem for 'sparse' checking for locking
      imbalance, and we've had a special '__cond_lock()' macro that we've used
      to let sparse know how the locking works:
      
          # define __cond_lock(x,c)        ((c) ? ({ __acquire(x); 1; }) : 0)
      
      so that you can then use this to tell sparse that (for example) the
      spinlock trylock macro ends up acquiring the lock when it succeeds, but
      not when it fails:
      
          #define raw_spin_trylock(lock)  __cond_lock(lock, _raw_spin_trylock(lock))
      
      and then sparse can follow along the locking rules when you have code like
      
              if (!spin_trylock(&dentry->d_lock))
                      return LRU_SKIP;
      	.. sparse sees that the lock is held here..
              spin_unlock(&dentry->d_lock);
      
      and sparse ends up happy about the lock contexts.
      
      However, this '__cond_lock()' use does result in very ugly header files,
      and requires you to basically wrap the real function with that macro
      that uses '__cond_lock'.  Which has made PeterZ NAK things that try to
      fix sparse warnings over the years [1].
      
      To solve this, there is now a very experimental patch to sparse that
      basically does the exact same thing as '__cond_lock()' did, but using a
      function attribute instead.  That seems to make PeterZ happy [2].
      
      Note that this does not replace existing use of '__cond_lock()', but
      only exposes the new proposed attribute and uses it for the previously
      unannotated 'refcount_dec_and_lock()' family of functions.
      
      For existing sparse installations, this will make no difference (a
      negative output context was ignored), but if you have the experimental
      sparse patch it will make sparse now understand code that uses those
      functions, the same way '__cond_lock()' makes sparse understand the very
      similar 'atomic_dec_and_lock()' uses that have the old '__cond_lock()'
      annotations.
      
      Note that in some cases this will silence existing context imbalance
      warnings.  But in other cases it may end up exposing new sparse warnings
      for code that sparse just didn't see the locking for at all before.
      
      This is a trial, in other words.  I'd expect that if it ends up being
      successful, and new sparse releases end up having this new attribute,
      we'll migrate the old-style '__cond_lock()' users to use the new-style
      '__cond_acquires' function attribute.
      
      The actual experimental sparse patch was posted in [3].
      
      Link: https://lore.kernel.org/all/20130930134434.GC12926@twins.programming.kicks-ass.net/ [1]
      Link: https://lore.kernel.org/all/Yr60tWxN4P568x3W@worktop.programming.kicks-ass.net/ [2]
      Link: https://lore.kernel.org/all/CAHk-=wjZfO9hGqJ2_hGQG3U_XzSh9_XaXze=HgPdvJbgrvASfA@mail.gmail.com/ [3]
      Acked-by: default avatarPeter Zijlstra <peterz@infradead.org>
      Cc: Alexander Aring <aahringo@redhat.com>
      Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4a557a5d
    • Linus Torvalds's avatar
      Merge tag 'xfs-5.19-fixes-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux · 20855e4c
      Linus Torvalds authored
      Pull xfs fixes from Darrick Wong:
       "This fixes some stalling problems and corrects the last of the
        problems (I hope) observed during testing of the new atomic xattr
        update feature.
      
         - Fix statfs blocking on background inode gc workers
      
         - Fix some broken inode lock assertion code
      
         - Fix xattr leaf buffer leaks when cancelling a deferred xattr update
           operation
      
         - Clean up xattr recovery to make it easier to understand.
      
         - Fix xattr leaf block verifiers tripping over empty blocks.
      
         - Remove complicated and error prone xattr leaf block bholding mess.
      
         - Fix a bug where an rt extent crossing EOF was treated as "posteof"
           blocks and cleaned unnecessarily.
      
         - Fix a UAF when log shutdown races with unmount"
      
      * tag 'xfs-5.19-fixes-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
        xfs: prevent a UAF when log IO errors race with unmount
        xfs: dont treat rt extents beyond EOF as eofblocks to be cleared
        xfs: don't hold xattr leaf buffers across transaction rolls
        xfs: empty xattr leaf header blocks are not corruption
        xfs: clean up the end of xfs_attri_item_recover
        xfs: always free xattri_leaf_bp when cancelling a deferred op
        xfs: use invalidate_lock to check the state of mmap_lock
        xfs: factor out the common lock flags assert
        xfs: introduce xfs_inodegc_push()
        xfs: bound maximum wait time for inodegc work
      20855e4c
  4. 02 Jul, 2022 8 commits
  5. 01 Jul, 2022 18 commits
    • Linus Torvalds's avatar
      Merge tag 'libnvdimm-fixes-5.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm · 08986606
      Linus Torvalds authored
      Pull libnvdimm fix from Vishal Verma:
      
       - Fix a bug in the libnvdimm 'BTT' (Block Translation Table) driver
         where accounting for poison blocks to be cleared was off by one,
         causing a failure to clear the the last badblock in an nvdimm region.
      
      * tag 'libnvdimm-fixes-5.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
        nvdimm: Fix badblocks clear off-by-one error
      08986606
    • Linus Torvalds's avatar
      Merge tag 'thermal-5.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · 1ce8c443
      Linus Torvalds authored
      Pull thermal control fix from Rafael Wysocki:
       "Add a new CPU ID to the list of supported processors in the
        intel_tcc_cooling driver (Sumeet Pawnikar)"
      
      * tag 'thermal-5.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
        thermal: intel_tcc_cooling: Add TCC cooling support for RaptorLake
      1ce8c443
    • Linus Torvalds's avatar
      Merge tag 'pm-5.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · 9ee78276
      Linus Torvalds authored
      Pull power management fixes from Rafael Wysocki:
       "These fix some issues in cpufreq drivers and some issues in devfreq:
      
         - Fix error code path issues related PROBE_DEFER handling in devfreq
           (Christian Marangi)
      
         - Revert an editing accident in SPDX-License line in the devfreq
           passive governor (Lukas Bulwahn)
      
         - Fix refcount leak in of_get_devfreq_events() in the exynos-ppmu
           devfreq driver (Miaoqian Lin)
      
         - Use HZ_PER_KHZ macro in the passive devfreq governor (Yicong Yang)
      
         - Fix missing of_node_put for qoriq and pmac32 driver (Liang He)
      
         - Fix issues around throttle interrupt for qcom driver (Stephen Boyd)
      
         - Add MT8186 to cpufreq-dt-platdev blocklist (AngeloGioacchino Del
           Regno)
      
         - Make amd-pstate enable CPPC on resume from S3 (Jinzhou Su)"
      
      * tag 'pm-5.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
        PM / devfreq: passive: revert an editing accident in SPDX-License line
        PM / devfreq: Fix kernel warning with cpufreq passive register fail
        PM / devfreq: Rework freq_table to be local to devfreq struct
        PM / devfreq: exynos-ppmu: Fix refcount leak in of_get_devfreq_events
        PM / devfreq: passive: Use HZ_PER_KHZ macro in units.h
        PM / devfreq: Fix cpufreq passive unregister erroring on PROBE_DEFER
        PM / devfreq: Mute warning on governor PROBE_DEFER
        PM / devfreq: Fix kernel panic with cpu based scaling to passive gov
        cpufreq: Add MT8186 to cpufreq-dt-platdev blocklist
        cpufreq: pmac32-cpufreq: Fix refcount leak bug
        cpufreq: qcom-hw: Don't do lmh things without a throttle interrupt
        drivers: cpufreq: Add missing of_node_put() in qoriq-cpufreq.c
        cpufreq: amd-pstate: Add resume and suspend callbacks
      9ee78276
    • Rafael J. Wysocki's avatar
      Merge branch 'pm-cpufreq' · bc621588
      Rafael J. Wysocki authored
      Merge cpufreq fixes for 5.19-rc5, including ARM cpufreq fixes and the
      following one:
      
       - Make amd-pstate enable CPPC on resume from S3 (Jinzhou Su).
      
      * pm-cpufreq:
        cpufreq: Add MT8186 to cpufreq-dt-platdev blocklist
        cpufreq: pmac32-cpufreq: Fix refcount leak bug
        cpufreq: qcom-hw: Don't do lmh things without a throttle interrupt
        drivers: cpufreq: Add missing of_node_put() in qoriq-cpufreq.c
        cpufreq: amd-pstate: Add resume and suspend callbacks
      bc621588
    • Linus Torvalds's avatar
      Merge tag 'hwmon-for-v5.19-rc5' of... · b336ad59
      Linus Torvalds authored
      Merge tag 'hwmon-for-v5.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging
      
      Pull hwmon fixes from Guenter Roeck:
      
       - Fix error handling in ibmaem driver initialization
      
       - Fix bad data reported by occ driver after setting power cap
      
       - Fix typos in pmbus/ucd9200 driver comments
      
      * tag 'hwmon-for-v5.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
        hwmon: (ibmaem) don't call platform_device_del() if platform_device_add() fails
        hwmon: (pmbus/ucd9200) fix typos in comments
        hwmon: (occ) Prevent power cap command overwriting poll response
      b336ad59
    • Yang Yingliang's avatar
      hwmon: (ibmaem) don't call platform_device_del() if platform_device_add() fails · d0e51022
      Yang Yingliang authored
      If platform_device_add() fails, it no need to call platform_device_del(), split
      platform_device_unregister() into platform_device_del/put(), so platform_device_put()
      can be called separately.
      
      Fixes: 8808a793 ("ibmaem: new driver for power/energy/temp meters in IBM System X hardware")
      Reported-by: default avatarHulk Robot <hulkci@huawei.com>
      Signed-off-by: default avatarYang Yingliang <yangyingliang@huawei.com>
      Link: https://lore.kernel.org/r/20220701074153.4021556-1-yangyingliang@huawei.comSigned-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
      d0e51022
    • Linus Torvalds's avatar
      Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux · d0f67adb
      Linus Torvalds authored
      Pull arm64 fix from Catalin Marinas:
       "Restore TLB invalidation for the 'break-before-make' rule on
        contiguous ptes (missed in a recent clean-up)"
      
      * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
        arm64: hugetlb: Restore TLB invalidation for BBM on contiguous ptes
      d0f67adb
    • Linus Torvalds's avatar
      Merge tag 's390-5.19-5' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux · cec84e75
      Linus Torvalds authored
      Pull s390 fixes from Alexander Gordeev:
      
       - Fix purgatory build process so bin2c tool does not get built
         unnecessarily and the Makefile is more consistent with other
         architectures.
      
       - Return earlier simple design of arch_get_random_seed_long|int() and
         arch_get_random_long|int() callbacks as result of changes in generic
         RNG code.
      
       - Fix minor comment typos and spelling mistakes.
      
      * tag 's390-5.19-5' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
        s390/qdio: Fix spelling mistake
        s390/sclp: Fix typo in comments
        s390/archrandom: simplify back to earlier design and initialize earlier
        s390/purgatory: remove duplicated build rule of kexec-purgatory.o
        s390/purgatory: hard-code obj-y in Makefile
        s390: remove unneeded 'select BUILD_BIN2C'
      cec84e75
    • Linus Torvalds's avatar
      Merge tag 'nfs-for-5.19-3' of git://git.linux-nfs.org/projects/anna/linux-nfs · 76ff294e
      Linus Torvalds authored
      Pull NFS client fixes from Anna Schumaker:
      
       - Allocate a fattr for _nfs4_discover_trunking()
      
       - Fix module reference count leak in nfs4_run_state_manager()
      
      * tag 'nfs-for-5.19-3' of git://git.linux-nfs.org/projects/anna/linux-nfs:
        NFSv4: Add an fattr allocation to _nfs4_discover_trunking()
        NFS: restore module put when manager exits.
      76ff294e
    • Linus Torvalds's avatar
      Merge tag 'ceph-for-5.19-rc5' of https://github.com/ceph/ceph-client · 6f8693ea
      Linus Torvalds authored
      Pull ceph fix from Ilya Dryomov:
       "A ceph filesystem fix, marked for stable.
      
        There appears to be a deeper issue on the MDS side, but for now we are
        going with this one-liner to avoid busy looping and potential soft
        lockups"
      
      * tag 'ceph-for-5.19-rc5' of https://github.com/ceph/ceph-client:
        ceph: wait on async create before checking caps for syncfs
      6f8693ea
    • Linus Torvalds's avatar
      Merge tag 'for-5.19/dm-fixes-5' of... · 8300d380
      Linus Torvalds authored
      Merge tag 'for-5.19/dm-fixes-5' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
      
      Pull device mapper fixes from Mike Snitzer:
       "Three fixes for invalid memory accesses discovered by using KASAN
        while running the lvm2 testsuite's dm-raid tests. Includes changes to
        MD's raid5.c given the dependency dm-raid has on the MD code"
      
      * tag 'for-5.19/dm-fixes-5' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
        dm raid: fix KASAN warning in raid5_add_disks
        dm raid: fix KASAN warning in raid5_remove_disk
        dm raid: fix accesses beyond end of raid member array
      8300d380
    • Linus Torvalds's avatar
      Merge tag 'io_uring-5.19-2022-07-01' of git://git.kernel.dk/linux-block · 0a35d162
      Linus Torvalds authored
      Pull io_uring fixes from Jens Axboe:
       "Two minor tweaks:
      
         - While we still can, adjust the send/recv based flags to be in
           ->ioprio rather than in ->addr2. This is consistent with eg accept,
           and also doesn't waste a full 64-bit field for flags (Pavel)
      
         - 5.18-stable fix for re-importing provided buffers. Not much real
           world relevance here as it'll only impact non-pollable files gone
           async, which is more of a practical test case rather than something
           that is used in the wild (Dylan)"
      
      * tag 'io_uring-5.19-2022-07-01' of git://git.kernel.dk/linux-block:
        io_uring: fix provided buffer import
        io_uring: keep sendrecv flags in ioprio
      0a35d162
    • Linus Torvalds's avatar
      Merge tag 'block-5.19-2022-07-01' of git://git.kernel.dk/linux-block · d516e221
      Linus Torvalds authored
      Pull block fixes from Jens Axboe:
      
       - Fix for batch getting of tags in sbitmap (wuchi)
      
       - NVMe pull request via Christoph:
            - More quirks (Lamarque Vieira Souza, Pablo Greco)
            - Fix a fabrics disconnect regression (Ruozhu Li)
            - Fix a nvmet-tcp data_digest calculation regression (Sagi
              Grimberg)
            - Fix nvme-tcp send failure handling (Sagi Grimberg)
            - Fix a regression with nvmet-loop and passthrough controllers
              (Alan Adamson)
      
      * tag 'block-5.19-2022-07-01' of git://git.kernel.dk/linux-block:
        nvme-pci: add NVME_QUIRK_BOGUS_NID for ADATA IM2P33F8ABR1
        nvmet: add a clear_ids attribute for passthru targets
        nvme: fix regression when disconnect a recovering ctrl
        nvme-pci: add NVME_QUIRK_BOGUS_NID for ADATA XPG SX6000LNP (AKA SPECTRIX S40G)
        nvme-tcp: always fail a request when sending it failed
        nvmet-tcp: fix regression in data_digest calculation
        lib/sbitmap: Fix invalid loop in __sbitmap_queue_get_batch()
      d516e221
    • Linus Torvalds's avatar
      Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi · 067c2273
      Linus Torvalds authored
      Pull SCSI fix from James Bottomley:
       "One simple driver fix for a dma overrun"
      
      * tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
        scsi: hisi_sas: Limit max hw sectors for v3 HW
      067c2273
    • Linus Torvalds's avatar
      Merge tag 'ata-5.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata · 690685ff
      Linus Torvalds authored
      Pull ATA fix from Damien Le Moal:
      
       - Fix a compilation warning with some versions of gcc/sparse when
         compiling the pata_cs5535 driver, from John.
      
      * tag 'ata-5.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata:
        ata: pata_cs5535: Fix W=1 warnings
      690685ff
    • Will Deacon's avatar
      arm64: hugetlb: Restore TLB invalidation for BBM on contiguous ptes · 41098230
      Will Deacon authored
      Commit fb396bb4 ("arm64/hugetlb: Drop TLB flush from get_clear_flush()")
      removed TLB invalidation from get_clear_flush() [now get_clear_contig()]
      on the basis that the core TLB invalidation code is aware of hugetlb
      mappings backed by contiguous page-table entries and will cover the
      correct virtual address range.
      
      However, this change also resulted in the TLB invalidation being removed
      from the "break" step in the break-before-make (BBM) sequence used
      internally by huge_ptep_set_{access_flags,wrprotect}(), therefore
      making the BBM sequence unsafe irrespective of later invalidation.
      
      Although the architecture is desperately unclear about how exactly
      contiguous ptes should be updated in a live page-table, restore TLB
      invalidation to our BBM sequence under the assumption that BBM is the
      right thing to be doing in the first place.
      
      Fixes: fb396bb4 ("arm64/hugetlb: Drop TLB flush from get_clear_flush()")
      Cc: Ard Biesheuvel <ardb@kernel.org>
      Cc: Steve Capper <steve.capper@arm.com>
      Cc: Anshuman Khandual <anshuman.khandual@arm.com>
      Cc: Mike Kravetz <mike.kravetz@oracle.com>
      Cc: Marc Zyngier <maz@kernel.org>
      Signed-off-by: default avatarWill Deacon <will@kernel.org>
      Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      Reviewed-by: default avatarAnshuman Khandual <anshuman.khandual@arm.com>
      Link: https://lore.kernel.org/r/20220629095349.25748-1-will@kernel.orgSigned-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      41098230
    • Linus Torvalds's avatar
      Merge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux · 9650910d
      Linus Torvalds authored
      Pull clk fixes from Stephen Boyd:
       "Two small fixes
      
         - Initialize a spinlock in the stm32 reset code
      
         - Add dt bindings to the clk maintainer filepattern"
      
      * tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux:
        MAINTAINERS: add include/dt-bindings/clock to COMMON CLK FRAMEWORK
        clk: stm32: rcc_reset: Fix missing spin_lock_init()
      9650910d
    • Darrick J. Wong's avatar
      xfs: prevent a UAF when log IO errors race with unmount · 7561cea5
      Darrick J. Wong authored
      KASAN reported the following use after free bug when running
      generic/475:
      
       XFS (dm-0): Mounting V5 Filesystem
       XFS (dm-0): Starting recovery (logdev: internal)
       XFS (dm-0): Ending recovery (logdev: internal)
       Buffer I/O error on dev dm-0, logical block 20639616, async page read
       Buffer I/O error on dev dm-0, logical block 20639617, async page read
       XFS (dm-0): log I/O error -5
       XFS (dm-0): Filesystem has been shut down due to log error (0x2).
       XFS (dm-0): Unmounting Filesystem
       XFS (dm-0): Please unmount the filesystem and rectify the problem(s).
       ==================================================================
       BUG: KASAN: use-after-free in do_raw_spin_lock+0x246/0x270
       Read of size 4 at addr ffff888109dd84c4 by task 3:1H/136
      
       CPU: 3 PID: 136 Comm: 3:1H Not tainted 5.19.0-rc4-xfsx #rc4 8e53ab5ad0fddeb31cee5e7063ff9c361915a9c4
       Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014
       Workqueue: xfs-log/dm-0 xlog_ioend_work [xfs]
       Call Trace:
        <TASK>
        dump_stack_lvl+0x34/0x44
        print_report.cold+0x2b8/0x661
        ? do_raw_spin_lock+0x246/0x270
        kasan_report+0xab/0x120
        ? do_raw_spin_lock+0x246/0x270
        do_raw_spin_lock+0x246/0x270
        ? rwlock_bug.part.0+0x90/0x90
        xlog_force_shutdown+0xf6/0x370 [xfs 4ad76ae0d6add7e8183a553e624c31e9ed567318]
        xlog_ioend_work+0x100/0x190 [xfs 4ad76ae0d6add7e8183a553e624c31e9ed567318]
        process_one_work+0x672/0x1040
        worker_thread+0x59b/0xec0
        ? __kthread_parkme+0xc6/0x1f0
        ? process_one_work+0x1040/0x1040
        ? process_one_work+0x1040/0x1040
        kthread+0x29e/0x340
        ? kthread_complete_and_exit+0x20/0x20
        ret_from_fork+0x1f/0x30
        </TASK>
      
       Allocated by task 154099:
        kasan_save_stack+0x1e/0x40
        __kasan_kmalloc+0x81/0xa0
        kmem_alloc+0x8d/0x2e0 [xfs]
        xlog_cil_init+0x1f/0x540 [xfs]
        xlog_alloc_log+0xd1e/0x1260 [xfs]
        xfs_log_mount+0xba/0x640 [xfs]
        xfs_mountfs+0xf2b/0x1d00 [xfs]
        xfs_fs_fill_super+0x10af/0x1910 [xfs]
        get_tree_bdev+0x383/0x670
        vfs_get_tree+0x7d/0x240
        path_mount+0xdb7/0x1890
        __x64_sys_mount+0x1fa/0x270
        do_syscall_64+0x2b/0x80
        entry_SYSCALL_64_after_hwframe+0x46/0xb0
      
       Freed by task 154151:
        kasan_save_stack+0x1e/0x40
        kasan_set_track+0x21/0x30
        kasan_set_free_info+0x20/0x30
        ____kasan_slab_free+0x110/0x190
        slab_free_freelist_hook+0xab/0x180
        kfree+0xbc/0x310
        xlog_dealloc_log+0x1b/0x2b0 [xfs]
        xfs_unmountfs+0x119/0x200 [xfs]
        xfs_fs_put_super+0x6e/0x2e0 [xfs]
        generic_shutdown_super+0x12b/0x3a0
        kill_block_super+0x95/0xd0
        deactivate_locked_super+0x80/0x130
        cleanup_mnt+0x329/0x4d0
        task_work_run+0xc5/0x160
        exit_to_user_mode_prepare+0xd4/0xe0
        syscall_exit_to_user_mode+0x1d/0x40
        entry_SYSCALL_64_after_hwframe+0x46/0xb0
      
      This appears to be a race between the unmount process, which frees the
      CIL and waits for in-flight iclog IO; and the iclog IO completion.  When
      generic/475 runs, it starts fsstress in the background, waits a few
      seconds, and substitutes a dm-error device to simulate a disk falling
      out of a machine.  If the fsstress encounters EIO on a pure data write,
      it will exit but the filesystem will still be online.
      
      The next thing the test does is unmount the filesystem, which tries to
      clean the log, free the CIL, and wait for iclog IO completion.  If an
      iclog was being written when the dm-error switch occurred, it can race
      with log unmounting as follows:
      
      Thread 1				Thread 2
      
      					xfs_log_unmount
      					xfs_log_clean
      					xfs_log_quiesce
      xlog_ioend_work
      <observe error>
      xlog_force_shutdown
      test_and_set_bit(XLOG_IOERROR)
      					xfs_log_force
      					<log is shut down, nop>
      					xfs_log_umount_write
      					<log is shut down, nop>
      					xlog_dealloc_log
      					xlog_cil_destroy
      					<wait for iclogs>
      spin_lock(&log->l_cilp->xc_push_lock)
      <KABOOM>
      
      Therefore, free the CIL after waiting for the iclogs to complete.  I
      /think/ this race has existed for quite a few years now, though I don't
      remember the ~2014 era logging code well enough to know if it was a real
      threat then or if the actual race was exposed only more recently.
      
      Fixes: ac983517 ("xfs: don't sleep in xlog_cil_force_lsn on shutdown")
      Signed-off-by: default avatarDarrick J. Wong <djwong@kernel.org>
      Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
      7561cea5