syzbot

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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff85a53d28 of 4 bytes by task 3102 on cpu 0:
 alloc_pid+0x50d/0x6b0 kernel/pid.c:275
 copy_process+0xeca/0x20e0 kernel/fork.c:2255
 kernel_clone+0x163/0x5c0 kernel/fork.c:2644
 __do_sys_clone kernel/fork.c:2761 [inline]
 __se_sys_clone kernel/fork.c:2745 [inline]
 __x64_sys_clone+0xbd/0xf0 kernel/fork.c:2745
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

read to 0xffffffff85a53d28 of 4 bytes by task 938 on cpu 1:
 copy_process+0x1528/0x20e0 kernel/fork.c:2404
 kernel_clone+0x163/0x5c0 kernel/fork.c:2644
 kernel_thread+0x7a/0xa0 kernel/fork.c:2696
 call_usermodehelper_exec_sync kernel/umh.c:135 [inline]
 call_usermodehelper_exec_work+0x76/0x150 kernel/umh.c:166
 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

value changed: 0x8000010b -> 0x8000010c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 938 Comm: kworker/u4:65 Not tainted 5.18.0-syzkaller-01444-g0350785b0a09-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound call_usermodehelper_exec_work
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