syzbot

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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff85a544f8 of 4 bytes by task 30135 on cpu 1:
 alloc_pid+0x50a/0x6b0 kernel/pid.c:275
 copy_process+0x111f/0x2180 kernel/fork.c:2523
 kernel_clone+0x169/0x560 kernel/fork.c:2915
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2993
 call_usermodehelper_exec_sync kernel/umh.c:133 [inline]
 call_usermodehelper_exec_work+0x7a/0x150 kernel/umh.c:164
 process_one_work+0x3e6/0x750 kernel/workqueue.c:2405
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2552
 kthread+0x1d7/0x210 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffffffff85a544f8 of 4 bytes by task 7372 on cpu 0:
 copy_process+0x1738/0x2180 kernel/fork.c:2659
 kernel_clone+0x169/0x560 kernel/fork.c:2915
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2993
 call_usermodehelper_exec_sync kernel/umh.c:133 [inline]
 call_usermodehelper_exec_work+0x7a/0x150 kernel/umh.c:164
 process_one_work+0x3e6/0x750 kernel/workqueue.c:2405
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2552
 kthread+0x1d7/0x210 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x800000d5 -> 0x800000d6

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7372 Comm: kworker/u4:54 Not tainted 6.4.0-rc4-syzkaller-00268-g51f269a6ecc7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Workqueue: events_unbound call_usermodehelper_exec_work
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