syzbot

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BUG: KCSAN: data-race in alloc_pid / copy_process

read-write to 0xffffffff85c53358 of 4 bytes by task 25685 on cpu 1:
 alloc_pid+0x50d/0x6b0 kernel/pid.c:275
 copy_process+0xee6/0x20e0 kernel/fork.c:2270
 kernel_clone+0x163/0x5c0 kernel/fork.c:2671
 __do_sys_clone kernel/fork.c:2805 [inline]
 __se_sys_clone kernel/fork.c:2789 [inline]
 __x64_sys_clone+0xc3/0xf0 kernel/fork.c:2789
 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+0x63/0xcd

read to 0xffffffff85c53358 of 4 bytes by task 17183 on cpu 0:
 copy_process+0x1530/0x20e0 kernel/fork.c:2421
 kernel_clone+0x163/0x5c0 kernel/fork.c:2671
 user_mode_thread+0x6c/0xa0 kernel/fork.c:2740
 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: 0x800000b9 -> 0x800000ba

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17183 Comm: kworker/u4:5 Not tainted 6.0.0-rc6-syzkaller-00309-g1a61b828566f-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Workqueue: events_unbound call_usermodehelper_exec_work
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