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BUG: KCSAN: data-race in dequeue_signal / ptrace_check_attach

read-write to 0xffff88813fa1f500 of 8 bytes by task 4738 on cpu 1:
 dequeue_signal+0x3ca/0x420 kernel/signal.c:688
 get_signal+0x349/0xff0 kernel/signal.c:2739
 arch_do_signal_or_restart+0x89/0x2a0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop+0x6f/0xe0 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88813fa1f500 of 8 bytes by task 4737 on cpu 0:
 ptrace_freeze_traced kernel/ptrace.c:199 [inline]
 ptrace_check_attach+0x7e/0x280 kernel/ptrace.c:266
 __do_sys_ptrace kernel/ptrace.c:1291 [inline]
 __se_sys_ptrace+0xd4/0x2a0 kernel/ptrace.c:1269
 __x64_sys_ptrace+0x55/0x60 kernel/ptrace.c:1269
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000000 -> 0x0000000008010000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4737 Comm: syz-executor.1 Not tainted 6.3.0-rc7-syzkaller-00191-g622322f53c6d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
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