================================================================== BUG: KCSAN: data-race in get_signal / ptrace_check_attach write to 0xffff88813dbd94d8 of 8 bytes by task 3240 on cpu 1: ptrace_signal kernel/signal.c:2542 [inline] get_signal+0xbd7/0x1610 kernel/signal.c:2723 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:789 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88813dbd94d8 of 8 bytes by task 3243 on cpu 0: ptrace_freeze_traced kernel/ptrace.c:194 [inline] ptrace_check_attach+0x144/0x2c0 kernel/ptrace.c:264 __do_sys_ptrace kernel/ptrace.c:1307 [inline] __se_sys_ptrace+0xd8/0x1b0 kernel/ptrace.c:1277 __x64_sys_ptrace+0x51/0x60 kernel/ptrace.c:1277 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000000000 -> 0x0000000000010000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 3243 Comm: syz-executor.1 Not tainted 5.13.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================