================================================================== BUG: KCSAN: data-race in free_pid / zap_pid_ns_processes read-write to 0xffff888135d99f08 of 4 bytes by task 15708 on cpu 1: free_pid+0x71/0x180 kernel/pid.c:136 __change_pid kernel/pid.c:353 [inline] detach_pid+0x147/0x160 kernel/pid.c:358 __unhash_process kernel/exit.c:77 [inline] __exit_signal kernel/exit.c:148 [inline] release_task+0x62b/0xd30 kernel/exit.c:199 exit_notify kernel/exit.c:699 [inline] do_exit+0xf11/0x1690 kernel/exit.c:845 do_group_exit+0xc8/0x170 kernel/exit.c:922 get_signal+0xd5e/0x1440 kernel/signal.c:2770 arch_do_signal_or_restart+0x2a/0x270 arch/x86/kernel/signal.c:811 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+0x109/0x1a0 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888135d99f08 of 4 bytes by task 8451 on cpu 0: zap_pid_ns_processes+0x236/0x350 kernel/pid_namespace.c:244 find_child_reaper kernel/exit.c:542 [inline] forget_original_parent kernel/exit.c:631 [inline] exit_notify kernel/exit.c:668 [inline] do_exit+0x13f4/0x1690 kernel/exit.c:845 do_group_exit+0xa0/0x170 kernel/exit.c:922 __do_sys_exit_group+0xb/0x10 kernel/exit.c:933 __se_sys_exit_group+0x5/0x10 kernel/exit.c:931 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:931 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 8451 Comm: syz-executor.2 Not tainted 5.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================