==================================================================
BUG: KCSAN: data-race in dequeue_signal / ptrace_check_attach

read-write to 0xffff888114708500 of 8 bytes by task 12531 on cpu 1:
 dequeue_signal+0x3ca/0x420
 get_signal+0x349/0xfe0
 arch_do_signal_or_restart+0x89/0x2b0
 exit_to_user_mode_loop+0x6d/0xe0
 exit_to_user_mode_prepare+0x6a/0xa0
 syscall_exit_to_user_mode+0x26/0x140
 do_syscall_64+0x4d/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888114708500 of 8 bytes by task 12530 on cpu 0:
 ptrace_check_attach+0x7e/0x280
 __se_sys_ptrace+0xd4/0x2a0
 __x64_sys_ptrace+0x55/0x60
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000000 -> 0x0000000008010000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12530 Comm: syz-executor.1 Tainted: G        W          6.2.0-rc6-syzkaller-00273-g837c07cf68fe-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
==================================================================