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BUG: KCSAN: data-race in memcpy_and_pad / release_task

write to 0xffff888101606cb0 of 8 bytes by task 70 on cpu 0:
 __list_del include/linux/list.h:241 [inline]
 __list_del_entry include/linux/list.h:264 [inline]
 list_del_rcu include/linux/rculist.h:178 [inline]
 __unhash_process kernel/exit.c:148 [inline]
 __exit_signal kernel/exit.c:211 [inline]
 release_task+0x710/0xb90 kernel/exit.c:272
 wait_task_zombie kernel/exit.c:1316 [inline]
 wait_consider_task+0x10ef/0x15f0 kernel/exit.c:1543
 do_wait_pid kernel/exit.c:1682 [inline]
 __do_wait+0x33c/0x500 kernel/exit.c:1717
 do_wait+0xb6/0x230 kernel/exit.c:1758
 kernel_wait+0x72/0x100 kernel/exit.c:1934
 call_usermodehelper_exec_sync kernel/umh.c:134 [inline]
 call_usermodehelper_exec_work+0x9c/0x160 kernel/umh.c:161
 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

read to 0xffff888101606780 of 3456 bytes by task 10939 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/0x750 kernel/fork.c:926
 copy_process+0x5a0/0x2340 kernel/fork.c:2133
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2766
 __do_sys_clone kernel/fork.c:2908 [inline]
 __se_sys_clone kernel/fork.c:2892 [inline]
 __x64_sys_clone+0x143/0x180 kernel/fork.c:2892
 x64_sys_call+0x2479/0x2550 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 10939 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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