KCSAN: data-race in copy_process / free

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in copy_process / free_pid (8) kernel	6	1	1260d	1260d	0/29	auto-obsoleted due to no activity on 2023/01/17 03:08
upstream	KCSAN: data-race in copy_process / free_pid (11) kernel	6	1	726d	726d	0/29	auto-obsoleted due to no activity on 2024/06/30 01:30
upstream	KCSAN: data-race in copy_process / free_pid mm	6	1	2352d	2352d	0/29	auto-closed as invalid on 2020/02/20 19:37
upstream	KCSAN: data-race in copy_process / free_pid (10) kernel	6	23	765d	894d	0/29	auto-obsoleted due to no activity on 2024/05/21 14:09
upstream	KCSAN: data-race in copy_process / free_pid (9) kernel	6	12	1008d	1094d	0/29	auto-obsoleted due to no activity on 2023/09/21 05:02
upstream	KCSAN: data-race in copy_process / free_pid (6) kernel	6	2	1450d	1454d	0/29	auto-closed as invalid on 2022/07/06 07:38
upstream	KCSAN: data-race in copy_process / free_pid (4) kernel	6	1	1755d	1755d	0/29	auto-closed as invalid on 2021/09/04 11:26
upstream	KCSAN: data-race in copy_process / free_pid (5) kernel	6	32	1591d	1710d	0/29	auto-closed as invalid on 2022/02/15 18:33
upstream	KCSAN: data-race in copy_process / free_pid (7) kernel	6	4	1350d	1402d	0/29	auto-obsoleted due to no activity on 2022/10/14 18:22
upstream	KCSAN: data-race in copy_process / free_pid (13) kernel	6	6	581d	615d	0/29	auto-obsoleted due to no activity on 2024/11/22 02:42
upstream	KCSAN: data-race in copy_process / free_pid (3) kernel	6	1	1945d	1945d	0/29	auto-closed as invalid on 2021/02/26 04:07
upstream	KCSAN: data-race in copy_process / free_pid (12) kernel	6	1	683d	683d	0/29	auto-obsoleted due to no activity on 2024/08/11 08:23
upstream	KCSAN: data-race in copy_process / free_pid (14) kernel	6	283	2d03h	503d	0/29	moderation: reported on 2025/01/04 00:52

================================================================== BUG: KCSAN: data-race in copy_process / free_pid write to 0xffffffff85a7b9b0 of 4 bytes by task 12706 on cpu 1: free_pid+0xf1/0x1b0 kernel/pid.c:134 copy_process+0x316f/0x3b10 kernel/fork.c:2319 _do_fork+0xf7/0x790 kernel/fork.c:2436 __do_sys_clone kernel/fork.c:2591 [inline] __se_sys_clone kernel/fork.c:2572 [inline] __x64_sys_clone+0x12e/0x170 kernel/fork.c:2572 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffffffff85a7b9b0 of 4 bytes by task 27939 on cpu 0: copy_process+0x27d8/0x3b10 kernel/fork.c:2233 _do_fork+0xf7/0x790 kernel/fork.c:2436 __do_sys_clone kernel/fork.c:2591 [inline] __se_sys_clone kernel/fork.c:2572 [inline] __x64_sys_clone+0x12e/0x170 kernel/fork.c:2572 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 27939 Comm: udevd Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 27939 Comm: udevd Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x11d/0x187 lib/dump_stack.c:118 panic+0x210/0x640 kernel/panic.c:221 kcsan_report.cold+0xc/0x14 kernel/kcsan/report.c:609 kcsan_setup_watchpoint+0x3e3/0x420 kernel/kcsan/core.c:503 copy_process+0x27d8/0x3b10 kernel/fork.c:2233 _do_fork+0xf7/0x790 kernel/fork.c:2436 __do_sys_clone kernel/fork.c:2591 [inline] __se_sys_clone kernel/fork.c:2572 [inline] __x64_sys_clone+0x12e/0x170 kernel/fork.c:2572 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f8acb0e6f46 Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 14 25 10 00 00 00 31 d2 49 81 c2 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 31 01 00 00 85 c0 41 89 c4 0f 85 3b 01 00 RSP: 002b:00007ffd51b4a8e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffd51b4a8e0 RCX: 00007f8acb0e6f46 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffd51b4a940 R08: 0000000000006d23 R09: 0000000000006d23 R10: 00007f8acba03a70 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd51b4a900 R14: 0000000000000005 R15: 0000000000000005 Kernel Offset: disabled Rebooting in 86400 seconds..