KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru

Status: auto-closed as invalid on 2020/04/15 20:03
Subsystems: fs
[Documentation on labels]
First crash: 2464d, last: 2397d
▶ ▼ Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (10) ext4 race:benign prio:high 6 1 5d14h 5d14h 0/29 moderation: reported on 2026/08/25 03:54
upstream KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (4) ext4 6 80 852d 997d 0/29 auto-obsoleted due to no activity on 2024/06/03 21:44
upstream KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (8) ext4 6 9 269d 441d 0/29 auto-obsoleted due to no activity on 2026/01/28 21:28
upstream KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (3) fs 6 1 1289d 1289d 0/29 auto-obsoleted due to no activity on 2023/04/01 03:15
upstream KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (5) ext4 6 13 679d 796d 0/29 auto-obsoleted due to no activity on 2024/11/24 11:50
upstream KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (2) ext4 exfat 6 213 1333d 1794d 0/29 auto-obsoleted due to no activity on 2023/02/08 20:39
upstream KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (6) ext4 6 1 640d 640d 0/29 auto-obsoleted due to no activity on 2025/01/22 20:51
upstream KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (7) ext4 6 6 502d 576d 0/29 auto-obsoleted due to no activity on 2025/06/09 21:46
upstream KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru (9) prio:high ext4 6 6 81d 199d 0/29 auto-obsoleted due to no activity on 2026/08/05 13:03

Sample crash report:
==================================================================
BUG: KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru

read to 0xffff88812c02a218 of 8 bytes by task 15970 on cpu 1:
 has_bh_in_lru+0x44/0x90 fs/buffer.c:1427
 on_each_cpu_cond_mask+0xa3/0x150 kernel/smp.c:695
 on_each_cpu_cond+0x44/0x60 kernel/smp.c:721
 invalidate_bh_lrus+0x32/0x40 fs/buffer.c:1436
 kill_bdev+0x7f/0xb0 fs/block_dev.c:85
 __blkdev_put+0x138/0x420 fs/block_dev.c:1890
 blkdev_put+0x89/0x2f0 fs/block_dev.c:1958
 blkdev_close+0x52/0x60 fs/block_dev.c:1965
 __fput+0x1e1/0x520 fs/file_table.c:280
 ____fput+0x1f/0x30 fs/file_table.c:313
 task_work_run+0xf6/0x130 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2b4/0x2c0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x384/0x3a0 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812c02a218 of 8 bytes by task 15971 on cpu 0:
 invalidate_bh_lru+0x83/0xf0 fs/buffer.c:1416
 on_each_cpu_mask+0xfb/0x150 kernel/smp.c:649
 on_each_cpu_cond_mask+0xf7/0x150 kernel/smp.c:697
 on_each_cpu_cond+0x44/0x60 kernel/smp.c:721
 invalidate_bh_lrus+0x32/0x40 fs/buffer.c:1436
 kill_bdev+0x7f/0xb0 fs/block_dev.c:85
 __blkdev_put+0x138/0x420 fs/block_dev.c:1890
 blkdev_put+0x89/0x2f0 fs/block_dev.c:1958
 blkdev_close+0x52/0x60 fs/block_dev.c:1965
 __fput+0x1e1/0x520 fs/file_table.c:280
 ____fput+0x1f/0x30 fs/file_table.c:313
 task_work_run+0xf6/0x130 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2b4/0x2c0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x384/0x3a0 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15971 Comm: blkid Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (14):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/02/05 19:59 https://github.com/google/ktsan.git kcsan 245a43005292 662cf49a .config console log report ci2-upstream-kcsan-gce
2020/01/25 23:05 https://github.com/google/ktsan.git kcsan 245a43005292 f4e7270e .config console log report ci2-upstream-kcsan-gce
2020/01/24 07:46 https://github.com/google/ktsan.git kcsan 245a43005292 2e95ab33 .config console log report ci2-upstream-kcsan-gce
2020/01/23 14:00 https://github.com/google/ktsan.git kcsan 245a43005292 3334d684 .config console log report ci2-upstream-kcsan-gce
2020/01/17 08:33 https://github.com/google/ktsan.git kcsan 245a43005292 3de7aabb .config console log report ci2-upstream-kcsan-gce
2020/01/13 16:01 https://github.com/google/ktsan.git kcsan 245a43005292 99565c1a .config console log report ci2-upstream-kcsan-gce
2020/01/13 00:26 https://github.com/google/ktsan.git kcsan 245a43005292 53faa9fe .config console log report ci2-upstream-kcsan-gce
2020/01/12 01:39 https://github.com/google/ktsan.git kcsan 245a43005292 4c04afaa .config console log report ci2-upstream-kcsan-gce
2020/01/09 04:31 https://github.com/google/ktsan.git kcsan 245a43005292 ddc3e859 .config console log report ci2-upstream-kcsan-gce
2019/12/29 05:10 https://github.com/google/ktsan.git kcsan 245a43005292 af6b8ef8 .config console log report ci2-upstream-kcsan-gce
2019/12/24 14:04 https://github.com/google/ktsan.git kcsan 245a43005292 be5c2c81 .config console log report ci2-upstream-kcsan-gce
2019/12/21 15:30 https://github.com/google/ktsan.git kcsan 245a43005292 bc586918 .config console log report ci2-upstream-kcsan-gce
2019/12/06 16:55 https://github.com/google/ktsan.git kcsan ef798c30ba4e 85f26751 .config console log report ci2-upstream-kcsan-gce
2019/11/30 22:35 https://github.com/google/ktsan.git kcsan ef798c30ba4e a76bf83f .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.