KCSAN: data-race in init_file / prepare

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
c18ffeb9-5f08-47b1-aa1b-013e2c3f1a2a	assessment-security	DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	KCSAN: data-race in init_file / prepare_creds (3)	2026/07/08 01:55	2026/07/08 01:55	2026/07/08 02:32	93f579545ae410f5bccfa141d2e7bf03178f036c
482c8da0-7d25-4dfc-8d8e-c5bf6c093ec7	assessment-kcsan	Benign: ✅	❓	KCSAN: data-race in init_file / prepare_creds (3)	2026/07/06 21:48	2026/07/06 21:48	2026/07/06 23:08	93f579545ae410f5bccfa141d2e7bf03178f036c

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in init_file / prepare_creds fs	6				1	404d	404d	0/29	auto-obsoleted due to no activity on 2025/07/25 02:49
upstream	KCSAN: data-race in init_file / prepare_creds (2) fs prio:low	6				26	75d	346d	0/29	auto-obsoleted due to no activity on 2026/06/18 17:52

Kernel

Title

Rank 🛈

upstream

KCSAN: data-race in init_file / prepare_creds fs

404d

0/29

auto-obsoleted due to no activity on 2025/07/25 02:49

upstream

KCSAN: data-race in init_file / prepare_creds (2) fs prio:low

75d

346d

0/29

auto-obsoleted due to no activity on 2026/06/18 17:52

================================================================== BUG: KCSAN: data-race in init_file / prepare_creds write to 0xffff8881049530a8 of 4 bytes by task 7107 on cpu 1: get_cred_many include/linux/cred.h:222 [inline] get_cred include/linux/cred.h:238 [inline] init_file+0x2d/0x1b0 fs/file_table.c:183 alloc_empty_file+0x85/0x1e0 fs/file_table.c:266 alloc_file fs/file_table.c:396 [inline] alloc_file_pseudo+0x92/0x120 fs/file_table.c:427 __anon_inode_getfile fs/anon_inodes.c:164 [inline] anon_inode_getfile+0xa0/0x120 fs/anon_inodes.c:202 __do_sys_perf_event_open kernel/events/core.c:14179 [inline] __se_sys_perf_event_open+0xbf3/0x1250 kernel/events/core.c:13881 __x64_sys_perf_event_open+0x67/0x80 kernel/events/core.c:13881 x64_sys_call+0x2789/0x3020 arch/x86/include/generated/asm/syscalls_64.h:299 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 0xffff888104953000 of 184 bytes by task 7106 on cpu 0: prepare_creds+0x71/0x550 kernel/cred.c:192 __sys_setresgid+0x46c/0x570 kernel/sys.c:849 __do_sys_setresgid kernel/sys.c:874 [inline] __se_sys_setresgid kernel/sys.c:872 [inline] __x64_sys_setresgid+0x3f/0x50 kernel/sys.c:872 x64_sys_call+0x2aa1/0x3020 arch/x86/include/generated/asm/syscalls_64.h:120 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 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 7106 Comm: syz.3.1049 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/07/06 21:48	upstream	8cdeaa50eae8	88b240e4	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in init_file / prepare_creds

Crashes (1):

Assets (help?)