================================================================== BUG: KCSAN: data-race in free_pid / zap_pid_ns_processes write to 0xffff8880b5f01bd0 of 4 bytes by task 8105 on cpu 1: free_pid+0xfd/0x1c0 kernel/pid.c:134 __change_pid+0x169/0x1e0 kernel/pid.c:347 detach_pid+0x29/0x40 kernel/pid.c:352 __unhash_process kernel/exit.c:77 [inline] __exit_signal kernel/exit.c:157 [inline] release_task+0x9ec/0xc60 kernel/exit.c:207 exit_notify kernel/exit.c:687 [inline] do_exit+0xd94/0x18c0 kernel/exit.c:818 do_group_exit+0xb4/0x1c0 kernel/exit.c:895 get_signal+0x2a2/0x1320 kernel/signal.c:2734 do_signal+0x2f/0x6c0 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x250/0x2c0 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x384/0x3a0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880b5f01bd0 of 4 bytes by task 7915 on cpu 0: zap_pid_ns_processes+0x212/0x310 kernel/pid_namespace.c:251 find_child_reaper kernel/exit.c:530 [inline] forget_original_parent kernel/exit.c:619 [inline] exit_notify kernel/exit.c:656 [inline] do_exit+0x16bd/0x18c0 kernel/exit.c:818 do_group_exit+0xb4/0x1c0 kernel/exit.c:895 __do_sys_exit_group kernel/exit.c:906 [inline] __se_sys_exit_group kernel/exit.c:904 [inline] __x64_sys_exit_group+0x2e/0x30 kernel/exit.c:904 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 7915 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================