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KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks

Status: auto-closed as invalid on 2021/03/09 10:48
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+e650b68cb43c23ec0163@syzkaller.appspotmail.com
First crash: 2036d, last: 1807d
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks (2) ext4 6 150 1489d 1688d 0/29 auto-closed as invalid on 2022/01/21 20:42
upstream KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks (3) ext4 6 1 1344d 1344d 0/29 closed as invalid on 2022/05/13 11:20

Sample crash report:
==================================================================
BUG: KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks

write to 0xffff888101f35764 of 4 bytes by task 13922 on cpu 1:
 mb_free_blocks+0x156/0xb60 fs/ext4/mballoc.c:1464
 ext4_free_blocks+0x134d/0x1bd0 fs/ext4/mballoc.c:5449
 ext4_ext_try_to_merge_up fs/ext4/extents.c:1830 [inline]
 ext4_ext_try_to_merge+0x2fa/0x310 fs/ext4/extents.c:1857
 ext4_swap_extents+0x102d/0x13a0 fs/ext4/extents.c:5693
 move_extent_per_page+0x143c/0x16c0 fs/ext4/move_extent.c:339
 ext4_move_extents+0xaac/0xc00 fs/ext4/move_extent.c:673
 __ext4_ioctl fs/ext4/ioctl.c:988 [inline]
 ext4_ioctl+0x20ec/0x3560 fs/ext4/ioctl.c:1322
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888101f35764 of 4 bytes by task 13920 on cpu 0:
 ext4_mb_good_group_nolock fs/ext4/mballoc.c:2153 [inline]
 ext4_mb_regular_allocator+0x896/0x18f0 fs/ext4/mballoc.c:2386
 ext4_mb_new_blocks+0x71a/0x1170 fs/ext4/mballoc.c:4975
 ext4_new_meta_blocks+0x84/0x180 fs/ext4/balloc.c:679
 ext4_ext_grow_indepth fs/ext4/extents.c:1276 [inline]
 ext4_ext_create_new_leaf fs/ext4/extents.c:1380 [inline]
 ext4_ext_insert_extent+0x9b3/0x2bc0 fs/ext4/extents.c:2054
 ext4_split_extent_at+0x6f2/0xb40 fs/ext4/extents.c:3208
 ext4_force_split_extent_at fs/ext4/extents.c:305 [inline]
 ext4_swap_extents+0xd76/0x13a0 fs/ext4/extents.c:5664
 move_extent_per_page+0x143c/0x16c0 fs/ext4/move_extent.c:339
 ext4_move_extents+0xaac/0xc00 fs/ext4/move_extent.c:673
 __ext4_ioctl fs/ext4/ioctl.c:988 [inline]
 ext4_ioctl+0x20ec/0x3560 fs/ext4/ioctl.c:1322
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13920 Comm: syz-executor.4 Not tainted 5.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (184):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/02/02 10:47 upstream 88bb507a74ea 19e09687 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks
2021/02/01 20:37 upstream 88bb507a74ea e6b95f32 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks
2021/01/31 13:03 upstream 6642d600b541 fc9fd31e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks
2021/01/31 02:14 upstream 8c947645151c fc9fd31e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks
2021/01/30 10:17 upstream 0e9bcda5d286 fc9fd31e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks
2021/01/28 06:08 upstream 76c057c84d28 eefc07f2 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks
2021/01/27 20:30 upstream 76c057c84d28 a57db36f .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks
2021/01/27 10:15 upstream 2ab38c17aac1 a0ebf917 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks
2021/01/20 05:35 upstream 45dfb8a5659a 63631df1 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks
2021/01/18 14:59 upstream 19c329f68089 63631df1 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in ext4_mb_regular_allocator / mb_free_blocks
2021/01/17 10:37 upstream 0da0a8a0a0e1 813be542 .config console log report info ci2-upstream-kcsan-gce
2021/01/16 08:30 upstream 1d94330a437a 65a7a854 .config console log report info ci2-upstream-kcsan-gce
2021/01/14 23:25 upstream 146620506274 468dbb55 .config console log report info ci2-upstream-kcsan-gce
2021/01/13 21:12 upstream 65f0d2414b70 a945f0a3 .config console log report info ci2-upstream-kcsan-gce
2021/01/13 16:25 upstream e609571b5ffa a945f0a3 .config console log report info ci2-upstream-kcsan-gce
2021/01/12 19:39 upstream e609571b5ffa 0cdd6185 .config console log report info ci2-upstream-kcsan-gce
2021/01/10 00:53 upstream 2ff90100ace8 2c1f2513 .config console log report info ci2-upstream-kcsan-gce
2021/01/08 22:03 upstream 6279d812eab6 c104d4a3 .config console log report info ci2-upstream-kcsan-gce
2021/01/06 23:40 upstream 71c061d24438 c104d4a3 .config console log report info ci2-upstream-kcsan-gce
2021/01/06 12:17 upstream 9f1abbe97c08 fff20c29 .config console log report info ci2-upstream-kcsan-gce
2021/01/06 02:10 upstream 6207214a70bf b1c228e1 .config console log report info ci2-upstream-kcsan-gce
2021/01/04 22:49 upstream 36bbbd0e234d 2a28ff1f .config console log report info ci2-upstream-kcsan-gce
2020/12/30 14:10 upstream 139711f033f6 ecb8c012 .config console log report info ci2-upstream-kcsan-gce
2020/12/30 03:00 upstream 139711f033f6 0fa352f2 .config console log report info ci2-upstream-kcsan-gce
2020/12/29 02:25 upstream c76e02c59e13 8259d56c .config console log report info ci2-upstream-kcsan-gce
2020/12/29 01:08 upstream c76e02c59e13 8259d56c .config console log report info ci2-upstream-kcsan-gce
2020/12/28 19:23 upstream 5c8fe583cce5 8259d56c .config console log report info ci2-upstream-kcsan-gce
2020/12/28 03:31 upstream 5c8fe583cce5 2242f77f .config console log report info ci2-upstream-kcsan-gce
2020/12/21 23:23 upstream 8653b778e454 04201c06 .config console log report info ci2-upstream-kcsan-gce
2020/12/21 10:10 upstream e37b12e4bb21 04201c06 .config console log report info ci2-upstream-kcsan-gce
2020/12/20 19:44 upstream 6a447b0e3151 04201c06 .config console log report info ci2-upstream-kcsan-gce
2020/12/19 22:33 upstream 467f8165a2b0 04201c06 .config console log report info ci2-upstream-kcsan-gce
2020/12/19 01:20 upstream 3644e2d2dda7 04201c06 .config console log report info ci2-upstream-kcsan-gce
2020/12/18 14:09 upstream a409ed156a90 04201c06 .config console log report info ci2-upstream-kcsan-gce
2020/12/16 20:08 upstream 5e60366d56c6 04201c06 .config console log report info ci2-upstream-kcsan-gce
2020/12/15 23:06 upstream d635a69dd498 f213e07e .config console log report info ci2-upstream-kcsan-gce
2020/12/15 10:01 upstream 148842c98a24 97183ed7 .config console log report info ci2-upstream-kcsan-gce
2020/12/14 20:33 upstream fab0fca1da5c 97183ed7 .config console log report info ci2-upstream-kcsan-gce
2020/12/13 20:58 upstream ec6f5e0e5ca0 8f160dd5 .config console log report info ci2-upstream-kcsan-gce
2020/12/12 19:48 upstream 7b1b868e1d91 bca53db9 .config console log report info ci2-upstream-kcsan-gce
2020/12/11 13:12 upstream 33dc9614dc20 ba24ffcd .config console log report info ci2-upstream-kcsan-gce
2020/12/10 23:43 upstream 9fca90cf2892 f900b48c .config console log report info ci2-upstream-kcsan-gce
2020/12/09 21:08 upstream ca4bbdaf1716 c090b4da .config console log report info ci2-upstream-kcsan-gce
2020/12/08 20:28 upstream cd796ed33450 40cc414d .config console log report info ci2-upstream-kcsan-gce
2020/12/06 08:53 upstream 7059c2c00a21 f12ba0c5 .config console log report info ci2-upstream-kcsan-gce
2020/12/05 20:36 upstream 32f741b02f1a 50503117 .config console log report info ci2-upstream-kcsan-gce
2020/09/03 03:56 upstream fc3abb53250a abf9ba4f .config console log report ci2-upstream-kcsan-gce
2020/06/19 00:09 upstream 1b5044021070 3ea11d3f .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.