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BUG: KCSAN: data-race in copy_process / free_pid

read-write to 0xffffffff86861068 of 4 bytes by task 14751 on cpu 1:
 free_pid+0x7e/0x180 kernel/pid.c:125
 free_pids+0x7a/0xb0 kernel/pid.c:158
 release_task+0x97f/0xb70 kernel/exit.c:286
 exit_notify kernel/exit.c:791 [inline]
 do_exit+0xf5d/0x1840 kernel/exit.c:974
 kthread_exit+0x92/0x190 kernel/kthread.c:337
 kthread+0x4c1/0x540 kernel/kthread.c:466
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffffffff86861068 of 4 bytes by task 2 on cpu 0:
 copy_process+0x1754/0x1f60 kernel/fork.c:2553
 kernel_clone+0x168/0x5d0 kernel/fork.c:2810
 kernel_thread+0xbf/0xf0 kernel/fork.c:2872
 create_kthread kernel/kthread.c:487 [inline]
 kthreadd+0x29f/0x370 kernel/kthread.c:847
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x800000ca -> 0x800000c9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 2 Comm: kthreadd Not tainted 6.14.0-syzkaller-10764-gaa918db707fb #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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