================================================================== BUG: KCSAN: data-race in do_notify_parent_cldstop / wait_consider_task write to 0xffff88813a7a14c8 of 4 bytes by task 12906 on cpu 0: wait_task_stopped kernel/exit.c:1186 [inline] wait_consider_task+0xb84/0x19e0 kernel/exit.c:1372 ptrace_do_wait kernel/exit.c:1412 [inline] do_wait+0x244/0x6b0 kernel/exit.c:1519 kernel_wait4+0x13c/0x1a0 kernel/exit.c:1678 __do_sys_wait4 kernel/exit.c:1706 [inline] __se_sys_wait4 kernel/exit.c:1702 [inline] __x64_sys_wait4+0x7a/0x100 kernel/exit.c:1702 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88813a7a14c8 of 4 bytes by task 12902 on cpu 1: do_notify_parent_cldstop+0x1a3/0x280 kernel/signal.c:2110 ptrace_stop+0x2e2/0x670 kernel/signal.c:2254 ptrace_signal kernel/signal.c:2543 [inline] get_signal+0xbf2/0x1610 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 value changed: 0x0000000e -> 0x00000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 12902 Comm: syz-executor.4 Not tainted 5.13.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================