KCSAN: data-race in copy_process / show

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
8fcb6da1-717b-44d4-9641-13d92ecceafc	assessment-security	DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	KCSAN: data-race in copy_process / show_stat (5)	2026/06/02 21:33	2026/06/02 21:33	2026/06/02 21:34	62fe15281f5011cd203d8845b8767b10e7443aa5
5b80ad86-ea5a-4765-8cd6-518219c5f8af	assessment-kcsan	Benign: ✅	❓	KCSAN: data-race in copy_process / show_stat (5)	2026/05/30 00:32	2026/05/30 00:32	2026/05/30 00:33	6b4a844333e83556da95d61d7f207e7ef5cd4bc6

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in copy_process / show_stat (2) mm	6	2	2058d	2060d	0/29	auto-closed as invalid on 2020/11/28 01:56
upstream	KCSAN: data-race in copy_process / show_stat (3) mm	6	1	1451d	1451d	0/29	auto-closed as invalid on 2022/07/28 00:27
upstream	KCSAN: data-race in copy_process / show_stat mm	6	3	2095d	2133d	0/29	auto-closed as invalid on 2020/10/21 12:32
upstream	KCSAN: data-race in copy_process / show_stat (4) mm	6	1	1209d	1209d	0/29	auto-obsoleted due to no activity on 2023/04/17 12:00

Kernel

Title

Rank 🛈

upstream

KCSAN: data-race in copy_process / show_stat (2) mm

2058d

2060d

0/29

auto-closed as invalid on 2020/11/28 01:56

upstream

KCSAN: data-race in copy_process / show_stat (3) mm

1451d

0/29

auto-closed as invalid on 2022/07/28 00:27

upstream

KCSAN: data-race in copy_process / show_stat mm

2095d

2133d

0/29

auto-closed as invalid on 2020/10/21 12:32

upstream

KCSAN: data-race in copy_process / show_stat (4) mm

1209d

0/29

auto-obsoleted due to no activity on 2023/04/17 12:00

================================================================== BUG: KCSAN: data-race in copy_process / show_stat read-write to 0xffffffff89368ae0 of 8 bytes by task 15138 on cpu 0: copy_process+0x21f6/0x2370 kernel/fork.c:2510 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2722 __do_sys_clone kernel/fork.c:2863 [inline] __se_sys_clone kernel/fork.c:2847 [inline] __x64_sys_clone+0x143/0x180 kernel/fork.c:2847 x64_sys_call+0x1222/0x3020 arch/x86/include/generated/asm/syscalls_64.h:57 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 0xffffffff89368ae0 of 8 bytes by task 15131 on cpu 1: show_stat+0xc16/0xd80 fs/proc/stat.c:181 seq_read_iter+0x31e/0x940 fs/seq_file.c:231 proc_reg_read_iter+0xe6/0x180 fs/proc/inode.c:295 copy_splice_read+0x471/0x6c0 fs/splice.c:362 do_splice_read fs/splice.c:980 [inline] splice_direct_to_actor+0x26e/0x670 fs/splice.c:1084 do_splice_direct_actor fs/splice.c:1202 [inline] do_splice_direct+0x119/0x1a0 fs/splice.c:1228 do_sendfile+0x382/0x650 fs/read_write.c:1372 __do_sys_sendfile64 fs/read_write.c:1433 [inline] __se_sys_sendfile64 fs/read_write.c:1419 [inline] __x64_sys_sendfile64+0x105/0x150 fs/read_write.c:1419 x64_sys_call+0x2dc4/0x3020 arch/x86/include/generated/asm/syscalls_64.h:41 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: 0x0000000000003b23 -> 0x0000000000003b24 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 15131 Comm: syz.0.2819 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
2026/05/29 14:52	upstream	8fde5d1d47f6	6b4a8443	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in copy_process / show_stat

Crashes (1):

Assets (help?)