================================================================== BUG: KCSAN: data-race in do_notify_parent_cldstop / wait_consider_task write to 0xffff88814e77b548 of 4 bytes by task 28610 on cpu 0: wait_task_stopped kernel/exit.c:1185 [inline] wait_consider_task+0xb7d/0x19e0 kernel/exit.c:1371 ptrace_do_wait kernel/exit.c:1411 [inline] do_wait+0x1f4/0x640 kernel/exit.c:1518 kernel_wait4+0x13c/0x1a0 kernel/exit.c:1677 __do_sys_wait4 kernel/exit.c:1705 [inline] __se_sys_wait4 kernel/exit.c:1701 [inline] __x64_sys_wait4+0x7a/0x100 kernel/exit.c:1701 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88814e77b548 of 4 bytes by task 28608 on cpu 1: do_notify_parent_cldstop+0x1a3/0x280 kernel/signal.c:2071 ptrace_stop+0x2e2/0x670 kernel/signal.c:2215 ptrace_do_notify kernel/signal.c:2282 [inline] ptrace_notify+0x107/0x180 kernel/signal.c:2292 ptrace_report_syscall include/linux/tracehook.h:66 [inline] tracehook_report_syscall_entry include/linux/tracehook.h:105 [inline] arch_syscall_enter_tracehook include/linux/entry-common.h:98 [inline] syscall_trace_enter+0x87/0x290 kernel/entry/common.c:61 __syscall_enter_from_user_work kernel/entry/common.c:90 [inline] syscall_enter_from_user_mode+0x1c/0x20 kernel/entry/common.c:108 do_syscall_64+0x1e/0x90 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000005 -> 0x00000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 28608 Comm: syz-executor.1 Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================