KCSAN: data-race in kernfs_iop_permission / kernfs_iop_permission (5)

Status: auto-obsoleted due to no activity on 2024/10/23 06:46
Subsystems: kernfs
[Documentation on labels]
Reported-by: syzbot+78afc054d7601ae72960@syzkaller.appspotmail.com
First crash: 695d, last: 695d
▶ ▼ Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in kernfs_iop_permission / kernfs_iop_permission kernfs 6 1 974d 974d 0/29 auto-obsoleted due to no activity on 2024/01/18 07:18
upstream KCSAN: data-race in kernfs_iop_permission / kernfs_iop_permission (2) kernfs 6 1 915d 915d 0/29 auto-obsoleted due to no activity on 2024/03/16 21:17
upstream KCSAN: data-race in kernfs_iop_permission / kernfs_iop_permission (8) kernfs 6 1 405d 405d 0/29 auto-obsoleted due to no activity on 2025/08/29 19:17
upstream KCSAN: data-race in kernfs_iop_permission / kernfs_iop_permission (9) kernfs 6 1 295d 295d 0/29 auto-obsoleted due to no activity on 2025/12/18 00:44
upstream KCSAN: data-race in kernfs_iop_permission / kernfs_iop_permission (4) kernfs 6 3 749d 771d 0/29 auto-obsoleted due to no activity on 2024/08/29 19:56
upstream KCSAN: data-race in kernfs_iop_permission / kernfs_iop_permission (3) kernfs 6 1 824d 824d 0/29 auto-obsoleted due to no activity on 2024/06/15 22:09
upstream KCSAN: data-race in kernfs_iop_permission / kernfs_iop_permission (6) kernfs 6 1 634d 634d 0/29 auto-obsoleted due to no activity on 2025/01/13 01:11
upstream KCSAN: data-race in kernfs_iop_permission / kernfs_iop_permission (7) kernfs 6 2 518d 522d 0/29 auto-obsoleted due to no activity on 2025/05/09 14:22

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

write to 0xffff888106560c80 of 4 bytes by task 3266 on cpu 0:
 inode_set_ctime_to_ts include/linux/fs.h:1677 [inline]
 set_inode_attr fs/kernfs/inode.c:164 [inline]
 kernfs_refresh_inode fs/kernfs/inode.c:177 [inline]
 kernfs_iop_permission+0x17f/0x220 fs/kernfs/inode.c:288
 do_inode_permission fs/namei.c:468 [inline]
 inode_permission+0x18c/0x300 fs/namei.c:535
 may_lookup fs/namei.c:1775 [inline]
 link_path_walk+0x5f3/0x820 fs/namei.c:2366
 path_openat+0x1af/0x1fa0 fs/namei.c:3929
 do_filp_open+0xf7/0x200 fs/namei.c:3960
 do_sys_openat2+0xab/0x120 fs/open.c:1415
 do_sys_open fs/open.c:1430 [inline]
 __do_sys_openat fs/open.c:1446 [inline]
 __se_sys_openat fs/open.c:1441 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1441
 x64_sys_call+0x1025/0x2d60 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

write to 0xffff888106560c80 of 4 bytes by task 3261 on cpu 1:
 inode_set_ctime_to_ts include/linux/fs.h:1677 [inline]
 set_inode_attr fs/kernfs/inode.c:164 [inline]
 kernfs_refresh_inode fs/kernfs/inode.c:177 [inline]
 kernfs_iop_permission+0x17f/0x220 fs/kernfs/inode.c:288
 do_inode_permission fs/namei.c:468 [inline]
 inode_permission+0x18c/0x300 fs/namei.c:535
 may_lookup fs/namei.c:1775 [inline]
 link_path_walk+0x5f3/0x820 fs/namei.c:2366
 path_openat+0x1af/0x1fa0 fs/namei.c:3929
 do_filp_open+0xf7/0x200 fs/namei.c:3960
 do_sys_openat2+0xab/0x120 fs/open.c:1415
 do_sys_open fs/open.c:1430 [inline]
 __do_sys_openat fs/open.c:1446 [inline]
 __se_sys_openat fs/open.c:1441 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1441
 x64_sys_call+0x1025/0x2d60 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: 0x2ce5a0b2 -> 0x2d0439c9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3261 Comm: syz-executor Not tainted 6.11.0-syzkaller-04557-g2f27fce67173 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/09/18 06:46 upstream 2f27fce67173 c673ca06 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in kernfs_iop_permission / kernfs_iop_permission
* Struck through repros no longer work on HEAD.