==================================================================
BUG: KCSAN: data-race in memcpy_and_pad / release_task

write to 0xffff88811b764a30 of 8 bytes by task 19579 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_thread kernel/exit.c:1606 [inline]
 __do_wait+0xf1/0x500 kernel/exit.c:1724
 do_wait+0xb6/0x230 kernel/exit.c:1758
 kernel_wait4+0x19f/0x210 kernel/exit.c:1917
 __do_sys_wait4 kernel/exit.c:1945 [inline]
 __se_sys_wait4 kernel/exit.c:1941 [inline]
 __x64_sys_wait4+0x91/0x120 kernel/exit.c:1941
 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 0xffff88811b764500 of 3456 bytes by task 22189 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:2769
 __do_sys_clone3 kernel/fork.c:3072 [inline]
 __se_sys_clone3+0x1f5/0x230 kernel/fork.c:3051
 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3051
 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: 1 UID: 0 PID: 22189 Comm: syz.6.3832 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
==================================================================