KCSAN: data-race in __d_instantiate / path

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
7ce74155-1eb3-4f6c-920d-4fbbc47a76af	assessment-security	DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	KCSAN: data-race in __d_instantiate / path_openat (3)	2026/05/17 17:25	2026/05/17 17:25	2026/05/17 18:09	de5aae85e5f28e2fa1c7deefcc24fe286abe5140
be13523f-da85-4547-83c3-abdd7864a344	assessment-kcsan	Benign: ✅ Confident: ✅	❓	KCSAN: data-race in __d_instantiate / path_openat (3)	2026/04/14 22:21	2026/04/14 22:21	2026/04/14 22:42	c8d6f6d526ae159ea88891383314eef3fe44e939

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __d_instantiate / path_openat fs	6				1	351d	351d	0/29	auto-obsoleted due to no activity on 2025/07/28 17:11
upstream	KCSAN: data-race in __d_instantiate / path_openat (2) fs	6				2	158d	200d	0/29	auto-obsoleted due to no activity on 2026/02/06 09:23

Kernel

Title

Rank 🛈

upstream

KCSAN: data-race in __d_instantiate / path_openat fs

351d

0/29

auto-obsoleted due to no activity on 2025/07/28 17:11

upstream

KCSAN: data-race in __d_instantiate / path_openat (2) fs

158d

200d

0/29

auto-obsoleted due to no activity on 2026/02/06 09:23

================================================================== BUG: KCSAN: data-race in __d_instantiate / path_openat write to 0xffff88811b3323f0 of 8 bytes by task 12451 on cpu 1: __d_set_inode_and_type fs/dcache.c:407 [inline] __d_instantiate+0x1db/0x390 fs/dcache.c:2052 d_make_persistent+0x72/0x110 fs/dcache.c:2870 shmem_mknod+0x15f/0x170 mm/shmem.c:3881 shmem_create+0x34/0x50 mm/shmem.c:3933 lookup_open fs/namei.c:4511 [inline] open_last_lookups fs/namei.c:4611 [inline] path_openat+0xd75/0x2050 fs/namei.c:4855 do_file_open+0x16c/0x290 fs/namei.c:4887 do_sys_openat2+0x94/0x130 fs/open.c:1364 do_sys_open fs/open.c:1370 [inline] __do_sys_openat fs/open.c:1386 [inline] __se_sys_openat fs/open.c:1381 [inline] __x64_sys_openat+0xf2/0x120 fs/open.c:1381 x64_sys_call+0x1e39/0x3020 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88811b3323f0 of 8 bytes by task 12453 on cpu 0: lookup_fast_for_open fs/namei.c:4554 [inline] open_last_lookups fs/namei.c:4582 [inline] path_openat+0x464/0x2050 fs/namei.c:4855 do_file_open+0x16c/0x290 fs/namei.c:4887 do_sys_openat2+0x94/0x130 fs/open.c:1364 do_sys_open fs/open.c:1370 [inline] __do_sys_openat fs/open.c:1386 [inline] __se_sys_openat fs/open.c:1381 [inline] __x64_sys_openat+0xf2/0x120 fs/open.c:1381 x64_sys_call+0x1e39/0x3020 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000000000 -> 0xffff888105fa9348 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 12453 Comm: syz.6.2135 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 ==================================================================

Crashes (2):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/04/30 07:41	upstream	57b8e2d666a3	005438fc	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in __d_instantiate / path_openat
2026/04/14 22:21	upstream	d60bc1401583	362d1323	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in __d_instantiate / path_openat

Crashes (2):

Assets (help?)