syzbot


KCSAN: data-race in inode_update_timestamps / inode_update_timestamps (3)

Status: moderation: reported on 2024/10/06 02:38
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+761f549e0ef08ee79087@syzkaller.appspotmail.com
First crash: 173d, last: 20d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in inode_update_timestamps / inode_update_timestamps ext4 130 371d 475d 0/28 auto-obsoleted due to no activity on 2024/04/18 13:35
upstream KCSAN: data-race in inode_update_timestamps / inode_update_timestamps (2) ext4 9 216d 316d 0/28 auto-obsoleted due to no activity on 2024/09/28 05:23

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

write to 0xffff8881196ccc68 of 8 bytes by task 10001 on cpu 1:
 inode_set_mtime_to_ts include/linux/fs.h:1707 [inline]
 inode_update_timestamps+0x129/0x250 fs/inode.c:2070
 generic_update_time fs/inode.c:2105 [inline]
 inode_update_time fs/inode.c:2125 [inline]
 __file_update_time fs/inode.c:2353 [inline]
 file_update_time+0x219/0x2b0 fs/inode.c:2383
 pipe_write+0xa50/0xd00 fs/pipe.c:606
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0x77b/0x920 fs/read_write.c:679
 ksys_write+0xe8/0x1b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:739
 x64_sys_call+0x287e/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881196ccc68 of 8 bytes by task 10008 on cpu 0:
 inode_get_mtime_sec include/linux/fs.h:1689 [inline]
 inode_get_mtime include/linux/fs.h:1699 [inline]
 inode_update_timestamps+0x62/0x250 fs/inode.c:2064
 generic_update_time fs/inode.c:2105 [inline]
 inode_update_time fs/inode.c:2125 [inline]
 __file_update_time fs/inode.c:2353 [inline]
 file_update_time+0x219/0x2b0 fs/inode.c:2383
 pipe_write+0xa50/0xd00 fs/pipe.c:606
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0x77b/0x920 fs/read_write.c:679
 ksys_write+0xe8/0x1b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:739
 x64_sys_call+0x287e/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000067cb8ecf -> 0x0000000067cb8ed0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 10008 Comm: syz.0.2219 Not tainted 6.14.0-rc5-syzkaller-00137-g00a7d39898c8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/08 00:27 upstream 00a7d39898c8 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in inode_update_timestamps / inode_update_timestamps
2025/01/14 02:12 upstream c45323b7560e b1f1cd88 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in inode_update_timestamps / inode_update_timestamps
2024/12/20 17:03 upstream 8faabc041a00 0f61b415 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in inode_update_timestamps / inode_update_timestamps
2024/12/16 23:36 upstream f44d154d6e3d eec85da6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in inode_update_timestamps / inode_update_timestamps
2024/12/13 09:26 upstream 150b567e0d57 3547e30f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in inode_update_timestamps / inode_update_timestamps
2024/11/04 07:23 upstream a33ab3f94f51 f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in inode_update_timestamps / inode_update_timestamps
2024/10/17 04:54 upstream c964ced77262 666f77ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in inode_update_timestamps / inode_update_timestamps
2024/10/13 15:42 upstream 36c254515dc6 084d8178 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in inode_update_timestamps / inode_update_timestamps
2024/10/06 02:37 upstream fc20a3e57247 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in inode_update_timestamps / inode_update_timestamps
* Struck through repros no longer work on HEAD.