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BUG: KCSAN: data-race in memcpy_and_pad / release_task

write to 0xffff88811fc427b0 of 8 bytes by task 14712 on cpu 0:
 __list_del include/linux/list.h:226 [inline]
 __list_del_entry include/linux/list.h:249 [inline]
 list_del_rcu include/linux/rculist.h:178 [inline]
 __unhash_process kernel/exit.c:149 [inline]
 __exit_signal kernel/exit.c:212 [inline]
 release_task+0x6cf/0xb40 kernel/exit.c:270
 wait_task_zombie kernel/exit.c:1314 [inline]
 wait_consider_task+0x10ef/0x15f0 kernel/exit.c:1541
 do_wait_thread kernel/exit.c:1604 [inline]
 __do_wait+0xf1/0x500 kernel/exit.c:1722
 do_wait+0xb6/0x230 kernel/exit.c:1756
 kernel_wait4+0x19f/0x210 kernel/exit.c:1915
 __do_sys_wait4 kernel/exit.c:1943 [inline]
 __se_sys_wait4 kernel/exit.c:1939 [inline]
 __x64_sys_wait4+0x91/0x120 kernel/exit.c:1939
 x64_sys_call+0x2aee/0x3020 arch/x86/include/generated/asm/syscalls_64.h:62
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811fc42280 of 3456 bytes by task 15624 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
 __do_sys_clone kernel/fork.c:2889 [inline]
 __se_sys_clone kernel/fork.c:2873 [inline]
 __x64_sys_clone+0x143/0x180 kernel/fork.c:2873
 x64_sys_call+0x1222/0x3020 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 15624 Comm: dhcpcd-run-hook Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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