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BUG: KCSAN: data-race in memcpy_and_pad / release_task

write to 0xffff88810023a8a0 of 8 bytes by task 3564 on cpu 0:
 __list_del include/linux/list.h:226 [inline]
 __list_del_entry include/linux/list.h:249 [inline]
 list_del_init include/linux/list.h:318 [inline]
 __unhash_process kernel/exit.c:150 [inline]
 __exit_signal kernel/exit.c:212 [inline]
 release_task+0x750/0xb40 kernel/exit.c:270
 exit_notify kernel/exit.c:810 [inline]
 do_exit+0xd79/0x1500 kernel/exit.c:1021
 kthread+0xb5/0x270 kernel/kthread.c:398
 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 0xffff88810023a280 of 3456 bytes by task 2 on cpu 1:
 memcpy_and_pad+0x48/0x80 lib/string_helpers.c:1008
 arch_dup_task_struct+0x2c/0x40 arch/x86/kernel/process.c:108
 dup_task_struct+0x6d/0x6a0 kernel/fork.c:925
 copy_process+0x5a0/0x2310 kernel/fork.c:2115
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2748
 kernel_thread+0xe5/0x120 kernel/fork.c:2809
 create_kthread kernel/kthread.c:459 [inline]
 kthreadd+0x25b/0x320 kernel/kthread.c:817
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 2 Comm: kthreadd Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
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