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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff86e5c3a8 of 4 bytes by task 7613 on cpu 0:
 free_pid+0xb3/0x1b0 kernel/pid.c:124
 free_pids+0x7a/0xb0 kernel/pid.c:156
 release_task+0xa28/0xb90 kernel/exit.c:303
 exit_notify kernel/exit.c:787 [inline]
 do_exit+0xd5c/0x14f0 kernel/exit.c:999
 call_usermodehelper_exec_async+0x246/0x250 kernel/umh.c:120
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffffffff86e5c3a8 of 4 bytes by task 32 on cpu 1:
 copy_process+0x1b4b/0x23b0 kernel/fork.c:2500
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2785
 user_mode_thread+0xab/0xe0 kernel/fork.c:2862
 call_usermodehelper_exec_work+0x41/0x160 kernel/umh.c:169
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0x56a/0xa50 kernel/workqueue.c:3479
 worker_thread+0x569/0x750 kernel/workqueue.c:3560
 kthread+0x223/0x270 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x800000e0 -> 0x800000df

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 32 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: events_unbound call_usermodehelper_exec_work
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