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BUG: KCSAN: data-race in memcpy_and_pad / release_task

write to 0xffff8881044decb0 of 8 bytes by task 18762 on cpu 1:
 __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:149 [inline]
 __exit_signal kernel/exit.c:206 [inline]
 release_task+0x700/0xb80 kernel/exit.c:267
 wait_task_zombie kernel/exit.c:1285 [inline]
 wait_consider_task+0x10ef/0x15f0 kernel/exit.c:1512
 do_wait_thread kernel/exit.c:1575 [inline]
 __do_wait+0xf1/0x500 kernel/exit.c:1693
 do_wait+0xb7/0x270 kernel/exit.c:1727
 kernel_wait4+0x19f/0x210 kernel/exit.c:1886
 __do_sys_wait4 kernel/exit.c:1914 [inline]
 __se_sys_wait4 kernel/exit.c:1910 [inline]
 __x64_sys_wait4+0x91/0x120 kernel/exit.c:1910
 x64_sys_call+0x108f/0x2550 arch/x86/include/generated/asm/syscalls_64.h:62
 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

read to 0xffff8881044de780 of 3456 bytes by task 25403 on cpu 0:
 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:927
 copy_process+0x5a0/0x2400 kernel/fork.c:2142
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2790
 __do_sys_clone3 kernel/fork.c:3093 [inline]
 __se_sys_clone3+0x1f5/0x230 kernel/fork.c:3072
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3072
 x64_sys_call+0x437/0x2550 arch/x86/include/generated/asm/syscalls_64.h:436
 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: 0 UID: 0 PID: 25403 Comm: syz.8.3635 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
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