================================================================== BUG: KCSAN: data-race in do_notify_parent_cldstop / wait_consider_task write to 0xffff8881a3bd64c8 of 4 bytes by task 10943 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 0xffff8881a3bd64c8 of 4 bytes by task 10938 on cpu 1: do_notify_parent_cldstop+0x1a3/0x280 kernel/signal.c:2110 ptrace_stop+0x2e2/0x670 kernel/signal.c:2254 ptrace_do_notify kernel/signal.c:2321 [inline] ptrace_notify+0x107/0x180 kernel/signal.c:2331 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:60 __syscall_enter_from_user_work kernel/entry/common.c:89 [inline] syscall_enter_from_user_mode+0x1c/0x20 kernel/entry/common.c:107 do_syscall_64+0x27/0x90 arch/x86/entry/common.c:42 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 10938 Comm: syz-executor.2 Not tainted 5.13.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================