syzbot

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BUG: KCSAN: data-race in memcpy_and_pad / release_task

write to 0xffff888100232698 of 8 bytes by task 11810 on cpu 0:
 __list_del include/linux/list.h:203 [inline]
 __list_del_entry include/linux/list.h:226 [inline]
 list_del_init include/linux/list.h:295 [inline]
 __unhash_process kernel/exit.c:150 [inline]
 __exit_signal kernel/exit.c:212 [inline]
 release_task+0x76f/0xb60 kernel/exit.c:265
 exit_notify kernel/exit.c:777 [inline]
 do_exit+0xd5c/0x15a0 kernel/exit.c:983
 kthread_exit+0x93/0x190 kernel/kthread.c:336
 kthread+0xbd/0x280 kernel/kthread.c:429
 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff888100232100 of 3264 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+0x6e/0x940 kernel/fork.c:920
 copy_process+0x37e/0x20d0 kernel/fork.c:2050
 kernel_clone+0x16b/0x5d0 kernel/fork.c:2654
 kernel_thread+0xe5/0x120 kernel/fork.c:2715
 create_kthread kernel/kthread.c:490 [inline]
 kthreadd+0x25b/0x320 kernel/kthread.c:849
 ret_from_fork+0x150/0x360 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 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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