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BUG: KCSAN: data-race in memcpy_and_pad / zap_other_threads

read-write to 0xffff88810c7dd7b8 of 8 bytes by task 4563 on cpu 0:
 task_clear_jobctl_pending kernel/signal.c:339 [inline]
 zap_other_threads+0x114/0x290 kernel/signal.c:1345
 do_group_exit+0xe4/0x140 kernel/exit.c:1109
 __do_sys_exit_group kernel/exit.c:1125 [inline]
 __se_sys_exit_group kernel/exit.c:1123 [inline]
 __x64_sys_exit_group+0x1f/0x20 kernel/exit.c:1123
 x64_sys_call+0x2fff/0x3000 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd8/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810c7dd280 of 3264 bytes by task 4564 on cpu 1:
 memcpy_and_pad+0x48/0x80 lib/string_helpers.c:1007
 arch_dup_task_struct+0x2c/0x40 arch/x86/kernel/process.c:108
 dup_task_struct+0x83/0x690 kernel/fork.c:876
 copy_process+0x37d/0x1ef0 kernel/fork.c:2009
 create_io_thread+0x71/0xa0 kernel/fork.c:2556
 io_sq_offload_create+0x644/0x840 io_uring/sqpoll.c:517
 io_uring_create+0x2f2/0x4e0 io_uring/io_uring.c:3644
 io_uring_setup io_uring/io_uring.c:3715 [inline]
 __do_sys_io_uring_setup io_uring/io_uring.c:3749 [inline]
 __se_sys_io_uring_setup+0x1be/0x1d0 io_uring/io_uring.c:3740
 __x64_sys_io_uring_setup+0x31/0x40 io_uring/io_uring.c:3740
 x64_sys_call+0x244c/0x3000 arch/x86/include/generated/asm/syscalls_64.h:426
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd8/0x2a0 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: 4564 Comm: syz.0.295 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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