syzbot

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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff85a53318 of 4 bytes by task 1774 on cpu 0:
 alloc_pid+0x50d/0x6b0 kernel/pid.c:275
 copy_process+0xe97/0x2090 kernel/fork.c:2282
 kernel_clone+0x166/0x550 kernel/fork.c:2681
 user_mode_thread+0x6c/0xa0 kernel/fork.c:2757
 call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
 call_usermodehelper_exec_work+0x76/0x150 kernel/umh.c:167
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffffffff85a53318 of 4 bytes by task 16302 on cpu 1:
 copy_process+0x14c9/0x2090 kernel/fork.c:2427
 kernel_clone+0x166/0x550 kernel/fork.c:2681
 user_mode_thread+0x6c/0xa0 kernel/fork.c:2757
 call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
 call_usermodehelper_exec_work+0x76/0x150 kernel/umh.c:167
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x800000e9 -> 0x800000ea

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16302 Comm: kworker/u4:15 Tainted: G        W          6.2.0-rc5-syzkaller-00047-g7c46948a6e9c-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Workqueue: events_unbound call_usermodehelper_exec_work
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