KCSAN: data-race in vfs_fsync_range / writeback_single_inode

Status: closed as invalid on 2020/06/18 14:24
Subsystems: exfat
[Documentation on labels]
First crash: 2480d, last: 2253d
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in vfs_fsync_range / writeback_single_inode (7) ext4 6 765 252d 814d 0/29 auto-obsoleted due to no activity on 2026/01/19 07:56
upstream KCSAN: data-race in vfs_fsync_range / writeback_single_inode (4) exfat 6 101 1198d 1463d 0/29 auto-obsoleted due to no activity on 2023/06/05 02:12
upstream KCSAN: data-race in vfs_fsync_range / writeback_single_inode (3) exfat 6 12 1523d 1635d 0/29 auto-closed as invalid on 2022/07/14 22:12
upstream KCSAN: data-race in vfs_fsync_range / writeback_single_inode (5) exfat 6 3 1130d 1149d 0/29 auto-obsoleted due to no activity on 2023/08/12 00:00
upstream KCSAN: data-race in vfs_fsync_range / writeback_single_inode (6) exfat 6 13 903d 975d 0/29 auto-obsoleted due to no activity on 2024/03/25 18:33
upstream KCSAN: data-race in vfs_fsync_range / writeback_single_inode (2) exfat 6 131 1709d 2072d 0/29 auto-closed as invalid on 2022/01/09 20:31

Sample crash report:
==================================================================
BUG: KCSAN: data-race in vfs_fsync_range / writeback_single_inode

write to 0xffff888120f5d448 of 8 bytes by task 17781 on cpu 1:
 writeback_single_inode+0x1fc/0x2f0 fs/fs-writeback.c:1562
 sync_inode fs/fs-writeback.c:2602 [inline]
 sync_inode_metadata+0x75/0xa0 fs/fs-writeback.c:2622
 __generic_file_fsync+0x117/0x180 fs/libfs.c:1083
 fat_file_fsync+0x54/0x120 fs/fat/file.c:190
 vfs_fsync_range+0x7c/0x150 fs/sync.c:197
 generic_write_sync include/linux/fs.h:2872 [inline]
 generic_file_write_iter+0x31c/0x38e mm/filemap.c:3467
 call_write_iter include/linux/fs.h:1907 [inline]
 do_iter_readv_writev+0x4a7/0x5d0 fs/read_write.c:694
 do_iter_write fs/read_write.c:999 [inline]
 do_iter_write+0x137/0x3a0 fs/read_write.c:980
 vfs_iter_write+0x56/0x80 fs/read_write.c:1040
 iter_file_splice_write+0x530/0x830 fs/splice.c:760
 do_splice_from fs/splice.c:863 [inline]
 direct_splice_actor+0x97/0xb0 fs/splice.c:1037
 splice_direct_to_actor+0x22f/0x540 fs/splice.c:992
 do_splice_direct+0x152/0x1d0 fs/splice.c:1080
 do_sendfile+0x380/0x800 fs/read_write.c:1521
 __do_sys_sendfile64 fs/read_write.c:1576 [inline]
 __se_sys_sendfile64 fs/read_write.c:1568 [inline]
 __x64_sys_sendfile64+0xb8/0x140 fs/read_write.c:1568
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888120f5d448 of 8 bytes by task 17771 on cpu 0:
 vfs_fsync_range+0xd3/0x150 fs/sync.c:195
 generic_write_sync include/linux/fs.h:2872 [inline]
 generic_file_write_iter+0x31c/0x38e mm/filemap.c:3467
 call_write_iter include/linux/fs.h:1907 [inline]
 do_iter_readv_writev+0x4a7/0x5d0 fs/read_write.c:694
 do_iter_write fs/read_write.c:999 [inline]
 do_iter_write+0x137/0x3a0 fs/read_write.c:980
 vfs_iter_write+0x56/0x80 fs/read_write.c:1040
 iter_file_splice_write+0x530/0x830 fs/splice.c:760
 do_splice_from fs/splice.c:863 [inline]
 direct_splice_actor+0x97/0xb0 fs/splice.c:1037
 splice_direct_to_actor+0x22f/0x540 fs/splice.c:992
 do_splice_direct+0x152/0x1d0 fs/splice.c:1080
 do_sendfile+0x380/0x800 fs/read_write.c:1521
 __do_sys_sendfile64 fs/read_write.c:1576 [inline]
 __se_sys_sendfile64 fs/read_write.c:1568 [inline]
 __x64_sys_sendfile64+0xb8/0x140 fs/read_write.c:1568
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17771 Comm: syz-executor.3 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (12):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/06/09 14:25 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 092934c1 .config console log report ci2-upstream-kcsan-gce
2020/05/08 17:57 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 fe4122c3 .config console log report ci2-upstream-kcsan-gce
2020/04/28 19:08 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 e3ecea2e .config console log report ci2-upstream-kcsan-gce
2020/04/24 18:56 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 03d97a1b .config console log report ci2-upstream-kcsan-gce
2020/02/28 22:51 https://github.com/google/ktsan.git kcsan 766d004d1b85 c88c7b75 .config console log report ci2-upstream-kcsan-gce
2020/02/07 20:58 https://github.com/google/ktsan.git kcsan 6cccb8ba35bd 06150bf1 .config console log report ci2-upstream-kcsan-gce
2020/01/18 13:07 https://github.com/google/ktsan.git kcsan 245a43005292 3de7aabb .config console log report ci2-upstream-kcsan-gce
2020/01/15 18:07 https://github.com/google/ktsan.git kcsan 245a43005292 f9b69507 .config console log report ci2-upstream-kcsan-gce
2020/01/12 13:40 https://github.com/google/ktsan.git kcsan 245a43005292 31290a45 .config console log report ci2-upstream-kcsan-gce
2019/11/12 08:32 https://github.com/google/ktsan.git kcsan 7f2955e0d056 048f2d49 .config console log report ci2-upstream-kcsan-gce
2019/11/09 21:07 https://github.com/google/ktsan.git kcsan 94c006602e13 1e35461e .config console log report ci2-upstream-kcsan-gce
2019/10/26 17:35 https://github.com/google/ktsan.git kcsan 05f2236801fe 25bb509e .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.