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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff86a60018 of 4 bytes by task 4961 on cpu 0:
 free_pid+0xb9/0x1d0 kernel/pid.c:126
 free_pids+0x7a/0xb0 kernel/pid.c:159
 release_task+0x9a7/0xb60 kernel/exit.c:295
 exit_notify kernel/exit.c:777 [inline]
 do_exit+0xd56/0x1590 kernel/exit.c:983
 kthread_exit+0x93/0x190 kernel/kthread.c:336
 __module_put_and_kthread_exit+0x15/0x20 kernel/module/main.c:231
 cryptomgr_probe+0x15c/0x170 crypto/algboss.c:72
 kthread+0x488/0x510 kernel/kthread.c:463
 ret_from_fork+0x148/0x280 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

read to 0xffffffff86a60018 of 4 bytes by task 52 on cpu 1:
 copy_process+0x16e4/0x1f10 kernel/fork.c:2394
 kernel_clone+0x16b/0x5b0 kernel/fork.c:2651
 user_mode_thread+0x9c/0xd0 kernel/fork.c:2727
 call_usermodehelper_exec_sync kernel/umh.c:132 [inline]
 call_usermodehelper_exec_work+0x7a/0x160 kernel/umh.c:163
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0x4cd/0x9d0 kernel/workqueue.c:3340
 worker_thread+0x6bc/0x8b0 kernel/workqueue.c:3421
 kthread+0x488/0x510 kernel/kthread.c:463
 ret_from_fork+0x148/0x280 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

value changed: 0x800000de -> 0x800000dd

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 52 Comm: kworker/u8:3 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events_unbound call_usermodehelper_exec_work
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