==================================================================
BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff86c5c368 of 4 bytes by task 3022 on cpu 1:
 alloc_pid+0x6ca/0x950 kernel/pid.c:332
 copy_process+0x11a5/0x2370 kernel/fork.c:2280
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2722
 __do_sys_clone3 kernel/fork.c:3024 [inline]
 __se_sys_clone3+0x1f5/0x230 kernel/fork.c:3003
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3003
 x64_sys_call+0x580/0x3020 arch/x86/include/generated/asm/syscalls_64.h:436
 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 0xffffffff86c5c368 of 4 bytes by task 7530 on cpu 0:
 copy_process+0x1af1/0x2370 kernel/fork.c:2442
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2722
 user_mode_thread+0x9c/0xd0 kernel/fork.c:2798
 call_usermodehelper_exec_sync kernel/umh.c:132 [inline]
 call_usermodehelper_exec_work+0x7a/0x160 kernel/umh.c:163
 process_one_work kernel/workqueue.c:3314 [inline]
 process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3397
 worker_thread+0x58a/0x780 kernel/workqueue.c:3478
 kthread+0x22a/0x280 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x80000121 -> 0x80000122

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 7530 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events_unbound call_usermodehelper_exec_work
==================================================================
bridge0: port 1(bridge_slave_0) entered blocking state
bridge0: port 1(bridge_slave_0) entered forwarding state
bridge0: port 2(bridge_slave_1) entered blocking state
bridge0: port 2(bridge_slave_1) entered forwarding state