BUG: KASAN: use-after-free in xfs_iflush_cluster+0x9d7/0xaf0

[Andrea Gelmini <andrea.gelmini@gelma.net>]

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Hi everybody,
   using dev kernel v4.4, I have this:

[40240.371807] ==================================================================
[40240.371826] BUG: KASAN: use-after-free in xfs_iflush_cluster+0x9d7/0xaf0 at addr ffff88001ed15428
[40240.371832] Read of size 4 by task xfsaild/dm-0/332
[40240.371834] =============================================================================
[40240.371839] BUG xfs_ili (Tainted: G    B          ): kasan: bad access detected
[40240.371842] -----------------------------------------------------------------------------

[40240.371851] INFO: Allocated in kmem_zone_alloc+0x7c/0x180 age=996 cpu=2 pid=11139
[40240.371858]  ___slab_alloc.constprop.27+0x379/0x3a0
[40240.371863]  __slab_alloc.isra.24.constprop.26+0x26/0x40
[40240.371867]  kmem_cache_alloc+0x111/0x150
[40240.371871]  kmem_zone_alloc+0x7c/0x180
[40240.371876]  xfs_inode_item_init+0x22/0xb0
[40240.371881]  xfs_trans_ijoin+0xa4/0x110
[40240.371885]  xfs_rename+0x380/0xe70
[40240.371889]  xfs_vn_rename+0x2a8/0x5c0
[40240.371893]  vfs_rename+0xa64/0x1310
[40240.371899]  SyS_renameat2+0x961/0xa70
[40240.371902]  SyS_rename+0x19/0x20
[40240.371906]  entry_SYSCALL_64_fastpath+0x16/0x75
[40240.371911] INFO: Freed in xfs_inode_item_destroy+0x39/0x50 age=0 cpu=1 pid=40
[40240.371916]  __slab_free+0x292/0x3d0
[40240.371919]  kmem_cache_free+0x181/0x190
[40240.371923]  xfs_inode_item_destroy+0x39/0x50
[40240.371927]  xfs_inode_free+0xcd/0x360
[40240.371930]  xfs_reclaim_inode+0x542/0x880
[40240.371933]  xfs_reclaim_inodes_ag+0x356/0x710
[40240.371936]  xfs_reclaim_inodes_nr+0x49/0x60
[40240.371940]  xfs_fs_free_cached_objects+0x55/0x80
[40240.371944]  super_cache_scan+0x329/0x410
[40240.371949]  shrink_slab.part.7+0x2ee/0x510
[40240.371953]  shrink_zone+0x7a0/0xae0
[40240.371956]  kswapd+0x931/0x1010
[40240.371961]  kthread+0x1c0/0x260
[40240.371964]  ret_from_fork+0x3f/0x70
[40240.371968] INFO: Slab 0xffffea00007b4500 objects=17 used=14 fp=0xffff88001ed14c78 flags=0x4000000000004080
[40240.371971] INFO: Object 0xffff88001ed15398 @offset=5016 fp=0xffff88001ed151d0

[40240.371977] Bytes b4 ffff88001ed15388: 01 00 00 00 28 00 00 00 67 72 61 02 01 00 00 00  ....(...gra.....
[40240.371982] Object ffff88001ed15398: d0 51 d1 1e 00 88 ff ff 00 02 00 00 00 00 ad de  .Q..............
[40240.371986] Object ffff88001ed153a8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
[40240.371989] Object ffff88001ed153b8: 20 b7 27 c8 00 88 ff ff 00 80 19 35 00 88 ff ff   .'........5....
[40240.371993] Object ffff88001ed153c8: 3b 12 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ;...............
[40240.371996] Object ffff88001ed153d8: 30 d8 82 81 ff ff ff ff c0 26 5b 82 ff ff ff ff  0........&[.....
[40240.371999] Object ffff88001ed153e8: e8 53 d1 1e 00 88 ff ff e8 53 d1 1e 00 88 ff ff  .S.......S......
[40240.372003] Object ffff88001ed153f8: 00 00 00 00 00 00 00 00 73 0d 01 00 00 00 00 00  ........s.......
[40240.372006] Object ffff88001ed15408: c0 78 76 c8 00 88 ff ff 6b 2a 00 00 82 00 00 00  .xv.....k*......
[40240.372010] Object ffff88001ed15418: 73 0d 01 00 00 00 00 00 00 00 00 00 00 00 00 00  s...............
[40240.372013] Object ffff88001ed15428: 00 00 00 00 00 00 00 00                          ........
[40240.372019] CPU: 2 PID: 332 Comm: xfsaild/dm-0 Tainted: G    B           4.4.0-rc4KASan-00110-g35bfb6c #13
[40240.372021] Hardware name: LENOVO 2356LRG/2356LRG, BIOS G7ETA3WW (2.63 ) 04/16/2015
[40240.372024]  ffff88001ed14000 ffff880384d679e0 ffffffff819c71d7 ffff880386778000
[40240.372029]  ffff880384d67a10 ffffffff813e2504 ffff880386778000 ffffea00007b4500
[40240.372034]  ffff88001ed15398 ffff8800c87678c0 ffff880384d67a38 ffffffff813e6bcf
[40240.372038] Call Trace:
[40240.372043]  [<ffffffff819c71d7>] dump_stack+0x4b/0x74
[40240.372048]  [<ffffffff813e2504>] print_trailer+0xf4/0x150
[40240.372052]  [<ffffffff813e6bcf>] object_err+0x2f/0x40
[40240.372058]  [<ffffffff813e880c>] kasan_report_error+0x21c/0x540
[40240.372063]  [<ffffffff819d3900>] ? radix_tree_next_chunk+0x690/0x690
[40240.372068]  [<ffffffff813e8bee>] __asan_report_load4_noabort+0x3e/0x40
[40240.372073]  [<ffffffff817f2b47>] ? xfs_iflush_cluster+0x9d7/0xaf0
[40240.372077]  [<ffffffff817f2b47>] xfs_iflush_cluster+0x9d7/0xaf0
[40240.372081]  [<ffffffff817fb87a>] xfs_iflush+0x37a/0x5b0
[40240.372086]  [<ffffffff817fb500>] ? xfs_rename+0xe70/0xe70
[40240.372092]  [<ffffffff8120bd94>] ? del_timer_sync+0x64/0x80
[40240.372097]  [<ffffffff824cada0>] ? schedule_timeout+0x230/0x3a0
[40240.372102]  [<ffffffff8182d5ca>] xfs_inode_item_push+0x25a/0x390
[40240.372106]  [<ffffffff8182d370>] ? xfs_inode_item_unlock+0x80/0x80
[40240.372111]  [<ffffffff818444a3>] ? xfs_trans_ail_cursor_first+0x23/0x1a0
[40240.372115]  [<ffffffff81844d1b>] xfsaild+0x6fb/0x12b0
[40240.372119]  [<ffffffff81844620>] ? xfs_trans_ail_cursor_first+0x1a0/0x1a0
[40240.372123]  [<ffffffff824c3a92>] ? __schedule+0x642/0x19f0
[40240.372128]  [<ffffffff81844620>] ? xfs_trans_ail_cursor_first+0x1a0/0x1a0
[40240.372132]  [<ffffffff81844620>] ? xfs_trans_ail_cursor_first+0x1a0/0x1a0
[40240.372137]  [<ffffffff81154320>] kthread+0x1c0/0x260
[40240.372141]  [<ffffffff81154160>] ? kthread_worker_fn+0x560/0x560
[40240.372146]  [<ffffffff81154160>] ? kthread_worker_fn+0x560/0x560
[40240.372150]  [<ffffffff824ccf8f>] ret_from_fork+0x3f/0x70
[40240.372154]  [<ffffffff81154160>] ? kthread_worker_fn+0x560/0x560
[40240.372157] Memory state around the buggy address:
[40240.372161]  ffff88001ed15300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[40240.372164]  ffff88001ed15380: fc fc fc fb fb fb fb fb fb fb fb fb fb fb fb fb
[40240.372168] >ffff88001ed15400: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
[40240.372171]                                   ^
[40240.372174]  ffff88001ed15480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[40240.372177]  ffff88001ed15500: fc fc fc fc fc fc fc fc fc fc fc fc 00 00 00 00
[40240.372180] ==================================================================

   Also with more recent commits, I've got it:
[25886.160963] ==================================================================
[25886.160981] BUG: KASAN: use-after-free in xfs_iflush_cluster+0x9d7/0xaf0 at addr ffff880345ab67b0
[25886.160985] Read of size 4 by task xfsaild/dm-0/339
[25886.160987] =============================================================================
[25886.160991] BUG xfs_ili (Tainted: G           OE  ): kasan: bad access detected
[25886.160993] -----------------------------------------------------------------------------

[25886.160997] Disabling lock debugging due to kernel taint
[25886.161002] INFO: Allocated in kmem_zone_alloc+0x7c/0x180 age=29338 cpu=2 pid=3748
[25886.161008]  ___slab_alloc.constprop.27+0x379/0x3a0
[25886.161012]  __slab_alloc.isra.24.constprop.26+0x26/0x40
[25886.161015]  kmem_cache_alloc+0x111/0x150
[25886.161019]  kmem_zone_alloc+0x7c/0x180
[25886.161023]  xfs_inode_item_init+0x22/0xb0
[25886.161027]  xfs_trans_ijoin+0xa4/0x110
[25886.161031]  xfs_ialloc+0xa1d/0x1470
[25886.161034]  xfs_dir_ialloc+0x106/0x670
[25886.161038]  xfs_create+0x674/0x1070
[25886.161042]  xfs_generic_create+0x375/0x500
[25886.161045]  xfs_vn_mknod+0xf/0x20
[25886.161048]  xfs_vn_create+0xe/0x10
[25886.161053]  vfs_create+0x1ff/0x390
[25886.161057]  path_openat+0x2d41/0x3e50
[25886.161061]  do_filp_open+0x170/0x230
[25886.161065]  do_sys_open+0x198/0x350
[25886.161069] INFO: Freed in xfs_inode_item_destroy+0x39/0x50 age=0 cpu=3 pid=14453
[25886.161073]  __slab_free+0x292/0x3d0
[25886.161077]  kmem_cache_free+0x181/0x190
[25886.161080]  xfs_inode_item_destroy+0x39/0x50
[25886.161083]  xfs_inode_free+0xcd/0x360
[25886.161086]  xfs_reclaim_inode+0x542/0x880
[25886.161089]  xfs_reclaim_inodes_ag+0x356/0x710
[25886.161093]  xfs_reclaim_inodes_nr+0x49/0x60
[25886.161097]  xfs_fs_free_cached_objects+0x55/0x80
[25886.161101]  super_cache_scan+0x329/0x410
[25886.161105]  shrink_slab.part.7+0x2ee/0x510
[25886.161110]  shrink_zone+0x7a0/0xae0
[25886.161113]  do_try_to_free_pages+0x3d7/0xfd0
[25886.161117]  try_to_free_pages+0x144/0x1d0
[25886.161120]  __alloc_pages_nodemask+0x8dd/0x12b0
[25886.161124]  do_huge_pmd_anonymous_page+0x240/0xae0
[25886.161129]  handle_mm_fault+0x25fc/0x32f0
[25886.161133] INFO: Slab 0xffffea000d16ad80 objects=17 used=10 fp=0xffff880345ab7c80 flags=0x8000000000004080
[25886.161136] INFO: Object 0xffff880345ab6720 @offset=1824 fp=0xffff880345ab7008

[25886.161142] Bytes b4 ffff880345ab6710: 02 00 00 00 15 2b 00 00 74 5e 7a 01 01 00 00 00  .....+..t^z.....
[25886.161146] Object ffff880345ab6720: 08 70 ab 45 03 88 ff ff 00 02 00 00 00 00 ad de  .p.E............
[25886.161150] Object ffff880345ab6730: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
[25886.161153] Object ffff880345ab6740: 10 65 e7 85 03 88 ff ff 00 7b ef 85 03 88 ff ff  .e.......{......
[25886.161156] Object ffff880345ab6750: 3b 12 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ;...............
[25886.161159] Object ffff880345ab6760: 00 d9 82 81 ff ff ff ff c0 26 5b 82 ff ff ff ff  .........&[.....
[25886.161162] Object ffff880345ab6770: 70 67 ab 45 03 88 ff ff 70 67 ab 45 03 88 ff ff  pg.E....pg.E....
[25886.161166] Object ffff880345ab6780: 00 00 00 00 00 00 00 00 aa 83 00 00 00 00 00 00  ................
[25886.161170] Object ffff880345ab6790: c0 e3 a5 8b 03 88 ff ff 0f af 07 00 90 00 00 00  ................
[25886.161172] Object ffff880345ab67a0: c9 83 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
[25886.161174] Object ffff880345ab67b0: 00 00 00 00 00 00 00 00                          ........
[25886.161178] CPU: 2 PID: 339 Comm: xfsaild/dm-0 Tainted: G    B      OE   4.4.0-rc4KASan-00274-g7bb2729 #1
[25886.161180] Hardware name: LENOVO 2356LRG/2356LRG, BIOS G7ETA4WW (2.64 ) 10/08/2015
[25886.161182]  ffff880345ab6000 ffff880384f579e0 ffffffff819c7397 ffff8803867a4000
[25886.161185]  ffff880384f57a10 ffffffff813e2554 ffff8803867a4000 ffffea000d16ad80
[25886.161187]  ffff880345ab6720 ffff88038ba5e3c0 ffff880384f57a38 ffffffff813e6c1f
[25886.161190] Call Trace:
[25886.161194]  [<ffffffff819c7397>] dump_stack+0x4b/0x74
[25886.161197]  [<ffffffff813e2554>] print_trailer+0xf4/0x150
[25886.161200]  [<ffffffff813e6c1f>] object_err+0x2f/0x40
[25886.161203]  [<ffffffff813e885c>] kasan_report_error+0x21c/0x540
[25886.161207]  [<ffffffff811b39f0>] ? abort_exclusive_wait+0x1c0/0x1c0
[25886.161210]  [<ffffffff813e8c3e>] __asan_report_load4_noabort+0x3e/0x40
[25886.161213]  [<ffffffff817f2c17>] ? xfs_iflush_cluster+0x9d7/0xaf0
[25886.161215]  [<ffffffff817f2c17>] xfs_iflush_cluster+0x9d7/0xaf0
[25886.161218]  [<ffffffff817fb94a>] xfs_iflush+0x37a/0x5b0
[25886.161221]  [<ffffffff817fb5d0>] ? xfs_rename+0xe70/0xe70
[25886.161225]  [<ffffffff8120bd94>] ? del_timer_sync+0x64/0x80
[25886.161228]  [<ffffffff824caeb0>] ? schedule_timeout+0x230/0x3a0
[25886.161231]  [<ffffffff824cac80>] ? usleep_range+0xe0/0xe0
[25886.161234]  [<ffffffff8182d69a>] xfs_inode_item_push+0x25a/0x390
[25886.161237]  [<ffffffff8182d440>] ? xfs_inode_item_unlock+0x80/0x80
[25886.161239]  [<ffffffff81844573>] ? xfs_trans_ail_cursor_first+0x23/0x1a0
[25886.161241]  [<ffffffff81844deb>] xfsaild+0x6fb/0x12b0
[25886.161244]  [<ffffffff818446f0>] ? xfs_trans_ail_cursor_first+0x1a0/0x1a0
[25886.161246]  [<ffffffff824c3ba2>] ? __schedule+0x642/0x19f0
[25886.161248]  [<ffffffff818446f0>] ? xfs_trans_ail_cursor_first+0x1a0/0x1a0
[25886.161251]  [<ffffffff818446f0>] ? xfs_trans_ail_cursor_first+0x1a0/0x1a0
[25886.161254]  [<ffffffff81154320>] kthread+0x1c0/0x260
[25886.161256]  [<ffffffff81154160>] ? kthread_worker_fn+0x560/0x560
[25886.161259]  [<ffffffff81154160>] ? kthread_worker_fn+0x560/0x560
[25886.161262]  [<ffffffff824cd08f>] ret_from_fork+0x3f/0x70
[25886.161265]  [<ffffffff81154160>] ? kthread_worker_fn+0x560/0x560
[25886.161267] Memory state around the buggy address:
[25886.161270]  ffff880345ab6680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[25886.161273]  ffff880345ab6700: fc fc fc fc fb fb fb fb fb fb fb fb fb fb fb fb
[25886.161276] >ffff880345ab6780: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc
[25886.161278]                                      ^
[25886.161281]  ffff880345ab6800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[25886.161284]  ffff880345ab6880: fc fc fc fc fc fc fc fc fc fc fc fc fc 00 00 00
[25886.161286] ==================================================================

   The compiled kernel is a vanilla one, with a few patches pulled from BTRFS.
   The XFS filesystem is running on LUKS, on a SSD.

   No corruption or problems found at the moment.

Thanks a lot,
Andrea

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