syzbot

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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff85a56068 of 4 bytes by task 15074 on cpu 1:
 free_pid+0x80/0x170 kernel/pid.c:136
 copy_process+0x1b19/0x2180 kernel/fork.c:2752
 kernel_clone+0x169/0x560 kernel/fork.c:2912
 __do_sys_clone kernel/fork.c:3055 [inline]
 __se_sys_clone kernel/fork.c:3039 [inline]
 __x64_sys_clone+0xe8/0x120 kernel/fork.c:3039
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffffff85a56068 of 4 bytes by task 31221 on cpu 0:
 copy_process+0x1738/0x2180 kernel/fork.c:2656
 kernel_clone+0x169/0x560 kernel/fork.c:2912
 user_mode_thread+0x7d/0xb0 kernel/fork.c:2990
 call_usermodehelper_exec_sync kernel/umh.c:133 [inline]
 call_usermodehelper_exec_work+0x7a/0x150 kernel/umh.c:164
 process_one_work+0x434/0x860 kernel/workqueue.c:2600
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2751
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

value changed: 0x80000140 -> 0x8000013f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 31221 Comm: kworker/u4:0 Not tainted 6.5.0-rc6-syzkaller-00036-g4853c74bd7ab #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Workqueue: events_unbound call_usermodehelper_exec_work
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