================================================================== BUG: KCSAN: data-race in dequeue_signal / ptrace_check_attach read-write to 0xffff888115a97480 of 8 bytes by task 11529 on cpu 1: dequeue_signal+0x3ca/0x420 kernel/signal.c:688 get_signal+0x349/0xfe0 kernel/signal.c:2739 arch_do_signal_or_restart+0x89/0x2b0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop+0x6d/0xe0 kernel/entry/common.c:168 exit_to_user_mode_prepare+0x6a/0xa0 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff888115a97480 of 8 bytes by task 11516 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: 11516 Comm: syz-executor.2 Not tainted 6.2.0-syzkaller-13115-gee3f96b16468-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 ==================================================================