syzbot


KCSAN: data-race in __fsnotify_parent / fsnotify_put_mark (2)

Status: moderation: reported on 2024/06/04 04:39
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+b541fe51bebb7f1e4430@syzkaller.appspotmail.com
First crash: 18d, last: 7d05h
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __fsnotify_parent / fsnotify_put_mark fs 774 757d 1317d 0/27 auto-closed as invalid on 2022/06/30 10:31

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

write to 0xffff88810122a324 of 4 bytes by task 3091 on cpu 1:
 fsnotify_detach_connector_from_object fs/notify/mark.c:304 [inline]
 fsnotify_put_mark+0x2d8/0x5d0 fs/notify/mark.c:367
 __do_sys_inotify_rm_watch fs/notify/inotify/inotify_user.c:819 [inline]
 __se_sys_inotify_rm_watch+0x105/0x180 fs/notify/inotify/inotify_user.c:793
 __x64_sys_inotify_rm_watch+0x31/0x40 fs/notify/inotify/inotify_user.c:793
 x64_sys_call+0x1b06/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:256
 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 0xffff88810122a324 of 4 bytes by task 2782 on cpu 0:
 fsnotify_object_watched fs/notify/fsnotify.c:187 [inline]
 __fsnotify_parent+0xd4/0x370 fs/notify/fsnotify.c:217
 fsnotify_parent include/linux/fsnotify.h:96 [inline]
 fsnotify_file include/linux/fsnotify.h:125 [inline]
 fsnotify_open include/linux/fsnotify.h:395 [inline]
 do_dentry_open+0xa6c/0xbf0 fs/open.c:1011
 vfs_open+0x30/0x40 fs/open.c:1089
 do_open fs/namei.c:3650 [inline]
 path_openat+0x18d6/0x1da0 fs/namei.c:3807
 do_filp_open+0xf7/0x200 fs/namei.c:3834
 do_sys_openat2+0xab/0x120 fs/open.c:1405
 do_sys_open fs/open.c:1420 [inline]
 __do_sys_openat fs/open.c:1436 [inline]
 __se_sys_openat fs/open.c:1431 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1431
 x64_sys_call+0x1057/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:258
 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: 0x00002008 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2782 Comm: udevd Not tainted 6.10.0-rc3-syzkaller-00132-gc286c21ff942 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
==================================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/15 02:50 upstream c286c21ff942 f429ab00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __fsnotify_parent / fsnotify_put_mark
2024/06/06 21:16 upstream d30d0e49da71 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __fsnotify_parent / fsnotify_put_mark
2024/06/04 04:38 upstream f06ce441457d a1feae05 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __fsnotify_parent / fsnotify_put_mark
* Struck through repros no longer work on HEAD.