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KCSAN: data-race in fsnotify_destroy_mark / inotify_handle_inode_event (9)

Status: moderation: reported on 2026/03/23 19:35
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+c185466bef3fb295c0a3@syzkaller.appspotmail.com
First crash: 21h28m, last: 21h28m
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
41bb13bd-1c74-4bda-aadc-ac6f182c9b3b assessment-kcsan 💥 KCSAN: data-race in fsnotify_destroy_mark / inotify_handle_inode_event (9) 2026/03/24 09:40 2026/03/24 09:40 2026/03/24 09:40 971831e4896625f799f350fe4439dc0774b7154a+ unexpected git log output: "warning: unable to access '/root/.config/git/attributes': Permission denied\nwarning: unable to access '/root/.config/git/attributes': Permission denied\nc369299895a591d96745d6492d4888259b004a9e\nLinux 7.0-rc5\ntorvalds@linux-foundation.org\nLinus Torvalds\nSun Mar 22 14:42:17 2026 -0700\nec69c9e88315c4be70c283f18c2ff130da6320b5\nSun Mar 22 14:42:17 2026 -0700\n"
▶ ▼ Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in fsnotify_destroy_mark / inotify_handle_inode_event (6) fs 6 2 680d 714d 0/29 auto-obsoleted due to no activity on 2024/06/17 10:51
upstream KCSAN: data-race in fsnotify_destroy_mark / inotify_handle_inode_event (8) fs 6 1 418d 418d 0/29 auto-obsoleted due to no activity on 2025/03/27 02:07
upstream KCSAN: data-race in fsnotify_destroy_mark / inotify_handle_inode_event fs 6 1 1329d 1329d 0/29 auto-closed as invalid on 2022/09/07 06:46
upstream KCSAN: data-race in fsnotify_destroy_mark / inotify_handle_inode_event (4) fs 6 1 975d 975d 0/29 auto-obsoleted due to no activity on 2023/08/27 10:05
upstream KCSAN: data-race in fsnotify_destroy_mark / inotify_handle_inode_event (7) fs 6 1 621d 621d 0/29 auto-obsoleted due to no activity on 2024/08/15 15:27
upstream KCSAN: data-race in fsnotify_destroy_mark / inotify_handle_inode_event (2) fs 6 1 1234d 1234d 0/29 auto-obsoleted due to no activity on 2022/12/10 20:40
upstream KCSAN: data-race in fsnotify_destroy_mark / inotify_handle_inode_event (3) fs 6 1 1082d 1082d 0/29 auto-obsoleted due to no activity on 2023/05/12 13:04
upstream KCSAN: data-race in fsnotify_destroy_mark / inotify_handle_inode_event (5) fs 6 3 875d 886d 0/29 auto-obsoleted due to no activity on 2023/12/04 18:59

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

write to 0xffff888104c23184 of 4 bytes by task 11506 on cpu 1:
 fsnotify_free_mark fs/notify/mark.c:584 [inline]
 fsnotify_destroy_mark+0xeb/0x150 fs/notify/mark.c:602
 __do_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:805 [inline]
 __se_sys_inotify_rm_watch+0xe8/0x170 fs/notify/inotify/inotify_user.c:786
 __x64_sys_inotify_rm_watch+0x31/0x40 fs/notify/inotify/inotify_user.c:786
 x64_sys_call+0xc88/0x3020 arch/x86/include/generated/asm/syscalls_64.h:256
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888104c23184 of 4 bytes by task 3311 on cpu 0:
 inotify_handle_inode_event+0x34c/0x3d0 fs/notify/inotify/inotify_fsnotify.c:132
 fsnotify_handle_inode_event+0x1c0/0x220 fs/notify/fsnotify.c:272
 fsnotify_handle_event fs/notify/fsnotify.c:327 [inline]
 send_to_group fs/notify/fsnotify.c:375 [inline]
 fsnotify+0x15d0/0x1730 fs/notify/fsnotify.c:592
 __fsnotify_parent+0x2f8/0x3a0 fs/notify/fsnotify.c:238
 fsnotify_parent include/linux/fsnotify.h:96 [inline]
 fsnotify_path include/linux/fsnotify.h:113 [inline]
 fsnotify_file include/linux/fsnotify.h:127 [inline]
 fsnotify_close include/linux/fsnotify.h:457 [inline]
 __fput+0x1de/0x650 fs/file_table.c:455
 fput_close_sync+0xad/0x190 fs/file_table.c:574
 __do_sys_close fs/open.c:1509 [inline]
 __se_sys_close fs/open.c:1494 [inline]
 __x64_sys_close+0x55/0xf0 fs/open.c:1494
 x64_sys_call+0x275d/0x3020 arch/x86/include/generated/asm/syscalls_64.h:4
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3311 Comm: syz-executor Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/23 19:34 upstream c369299895a5 4933dba2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in fsnotify_destroy_mark / inotify_handle_inode_event
* Struck through repros no longer work on HEAD.