syzbot


KCSAN: data-race in generic_fillattr / touch_atime (4)

Status: moderation: reported on 2024/10/05 07:23
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+4827d590678301e16258@syzkaller.appspotmail.com
First crash: 174d, last: 18h57m
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in generic_fillattr / touch_atime (3) fs 2 245d 248d 0/28 auto-obsoleted due to no activity on 2024/08/29 17:20
upstream KCSAN: data-race in generic_fillattr / touch_atime (2) fs 1 288d 288d 0/28 auto-obsoleted due to no activity on 2024/07/17 21:50
upstream KCSAN: data-race in generic_fillattr / touch_atime fs 4 348d 406d 0/28 auto-obsoleted due to no activity on 2024/05/19 07:08

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

read to 0xffff888117bb3540 of 4 bytes by task 3289 on cpu 1:
 inode_get_atime_nsec include/linux/fs.h:1649 [inline]
 inode_get_atime include/linux/fs.h:1655 [inline]
 generic_fillattr+0x16f/0x330 fs/stat.c:96
 shmem_getattr+0x17b/0x200 mm/shmem.c:1249
 vfs_getattr_nosec fs/stat.c:208 [inline]
 vfs_getattr+0x172/0x1b0 fs/stat.c:246
 vfs_statx_path fs/stat.c:283 [inline]
 vfs_statx+0x12c/0x310 fs/stat.c:349
 vfs_fstatat+0xe4/0x130 fs/stat.c:368
 __do_sys_newfstatat fs/stat.c:532 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:526
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:526
 x64_sys_call+0x2d6f/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff888117bb3540 of 4 bytes by task 5319 on cpu 0:
 inode_set_atime_to_ts include/linux/fs.h:1664 [inline]
 inode_update_timestamps fs/inode.c:2035 [inline]
 generic_update_time fs/inode.c:2057 [inline]
 inode_update_time fs/inode.c:2077 [inline]
 touch_atime+0x1f3/0x350 fs/inode.c:2149
 do_readlinkat+0x12d/0x210 fs/stat.c:577
 __do_sys_readlink fs/stat.c:601 [inline]
 __se_sys_readlink fs/stat.c:598 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:598
 x64_sys_call+0x2a81/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x11862bac -> 0x11d6b136

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 5319 Comm: udevd Not tainted 6.14.0-syzkaller-03576-g1e1ba8d23dae #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================

Crashes (20):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/27 12:29 upstream 1e1ba8d23dae 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2025/03/26 18:48 upstream 2df0c02dab82 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2025/03/18 12:18 upstream fc444ada1310 ce3352cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2025/03/12 07:47 upstream 0b46b049d6ec ee70e6db .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2025/02/16 14:35 upstream ad1b832bf1cf 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2025/02/05 00:16 upstream d009de7d5428 5896748e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2025/02/03 02:57 upstream d79bc8f79baa 568559e4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2025/01/28 02:16 upstream 805ba04cb7cc 18070896 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2025/01/20 17:05 upstream ffd294d346d1 6e87cfa2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2025/01/18 23:48 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2024/12/23 10:31 upstream 4bbf9020becb b4fbdbd4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2024/12/16 10:08 upstream 78d4f34e2115 eec85da6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2024/12/06 19:21 upstream b8f52214c61a 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2024/12/03 23:53 upstream ceb8bf2ceaa7 b50eb251 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2024/11/27 06:35 upstream aaf20f870da0 52b38cc1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2024/11/26 23:00 upstream 445d9f05fa14 e9a9a9f2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2024/11/20 10:56 upstream bf9aa14fc523 7d02db5a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2024/11/15 23:02 upstream f868cd251776 cfe3a04a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2024/10/15 08:00 upstream eca631b8fe80 b01b6661 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
2024/10/05 07:22 upstream 2f91ff27b0ee d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in generic_fillattr / touch_atime
* Struck through repros no longer work on HEAD.