KCSAN: data-race in generic_fillattr / inode_set_ctime

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
0bb10610-f86e-45a9-b534-e05ab0e3f66f	assessment-security	DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	KCSAN: data-race in generic_fillattr / inode_set_ctime_current (4)	2026/05/30 09:48	2026/05/30 09:48	2026/05/30 10:25	6b4a844333e83556da95d61d7f207e7ef5cd4bc6
4ab1dfb6-fb24-46ee-83b7-71dddf0a22fc	assessment-security		💥	KCSAN: data-race in generic_fillattr / inode_set_ctime_current (4)	2026/05/14 09:25	2026/05/14 09:25	2026/05/14 09:28	6ccb967e465e832a7bfd7a116ad00d52a0923a5d	failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/45776d348471d68a01... truncated to first 200 bytes; open job for full error
90561fef-facb-4e9e-aa98-08c305242379	assessment-kcsan	Benign: ✅	❓	KCSAN: data-race in generic_fillattr / inode_set_ctime_current (4)	2026/05/11 10:20	2026/05/11 10:20	2026/05/11 10:43	fc6e6eac62ee224ed1276afaf24df37313ad0a0c

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in generic_fillattr / inode_set_ctime_current (2) fs	6	55	609d	742d	0/29	auto-obsoleted due to no activity on 2024/12/14 19:09
upstream	KCSAN: data-race in generic_fillattr / inode_set_ctime_current fs	6	62	778d	931d	0/29	auto-obsoleted due to no activity on 2024/06/14 18:17
upstream	KCSAN: data-race in generic_fillattr / inode_set_ctime_current (3) fs	6	2	112d	125d	0/29	auto-obsoleted due to no activity on 2026/05/02 22:36

Kernel

Title

Rank 🛈

upstream

KCSAN: data-race in generic_fillattr / inode_set_ctime_current (2) fs

609d

742d

0/29

auto-obsoleted due to no activity on 2024/12/14 19:09

upstream

KCSAN: data-race in generic_fillattr / inode_set_ctime_current fs

778d

931d

0/29

auto-obsoleted due to no activity on 2024/06/14 18:17

upstream

KCSAN: data-race in generic_fillattr / inode_set_ctime_current (3) fs

112d

125d

0/29

auto-obsoleted due to no activity on 2026/05/02 22:36

================================================================== BUG: KCSAN: data-race in generic_fillattr / inode_set_ctime_current write to 0xffff888104eba450 of 4 bytes by task 3287 on cpu 1: inode_set_ctime_to_ts fs/inode.c:2840 [inline] inode_set_ctime_current+0x25b/0x8e0 fs/inode.c:2903 shmem_xattr_handler_set+0x1ad/0x230 mm/shmem.c:4264 __vfs_setxattr+0x2e6/0x310 fs/xattr.c:223 __vfs_setxattr_noperm+0xdb/0x3f0 fs/xattr.c:257 __vfs_setxattr_locked+0x105/0x220 fs/xattr.c:318 vfs_setxattr+0x12c/0x2a0 fs/xattr.c:344 do_setxattr fs/xattr.c:662 [inline] filename_setxattr+0x1c4/0x410 fs/xattr.c:690 path_setxattrat+0x2c1/0x320 fs/xattr.c:734 __do_sys_lsetxattr fs/xattr.c:775 [inline] __se_sys_lsetxattr fs/xattr.c:771 [inline] __x64_sys_lsetxattr+0x71/0x90 fs/xattr.c:771 x64_sys_call+0x1300/0x3020 arch/x86/include/generated/asm/syscalls_64.h:190 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888104eba450 of 4 bytes by task 3589 on cpu 0: inode_get_ctime_nsec include/linux/fs.h:1690 [inline] inode_get_ctime include/linux/fs.h:1696 [inline] generic_fillattr+0x1d6/0x340 fs/stat.c:101 shmem_getattr+0x181/0x200 mm/shmem.c:1302 vfs_getattr_nosec+0x146/0x1e0 fs/stat.c:213 vfs_getattr+0x48/0x60 fs/stat.c:262 vfs_statx_path+0x28/0x140 fs/stat.c:299 vfs_statx+0xc4/0x170 fs/stat.c:356 vfs_fstatat+0x118/0x170 fs/stat.c:373 __do_sys_newfstatat fs/stat.c:538 [inline] __se_sys_newfstatat+0x55/0x3e0 fs/stat.c:532 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:532 x64_sys_call+0x2c64/0x3020 arch/x86/include/generated/asm/syscalls_64.h:263 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x13f122ce -> 0x1517dbc4 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 3589 Comm: udevd Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 ==================================================================

Crashes (3):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Assets (help?)	Manager	Title
2026/06/23 03:48	upstream	1dc18801be29	5a630be6	.config	console log	report	info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in generic_fillattr / inode_set_ctime_current
2026/06/20 02:02	upstream	5e2e14749c3d	43bfcdb0	.config	console log	report	info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in generic_fillattr / inode_set_ctime_current
2026/05/11 10:20	upstream	5d6919055dec	845acb1c	.config	console log	report	info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in generic_fillattr / inode_set_ctime_current

Crashes (3):

Assets (help?)