================================================================== BUG: KCSAN: data-race in mm_update_next_owner / ns_capable_common read to 0xffff88810461e0e4 of 4 bytes by task 22409 on cpu 1: mm_update_next_owner+0x373/0x5a0 kernel/exit.c:389 exit_mm kernel/exit.c:484 [inline] do_exit+0x4a4/0x18c0 kernel/exit.c:784 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 write to 0xffff88810461e0e4 of 4 bytes by task 4419 on cpu 0: ns_capable_common+0x9f/0xc0 kernel/capability.c:377 ns_capable+0x29/0x40 kernel/capability.c:396 may_mount fs/namespace.c:1643 [inline] ksys_umount+0x97/0xab0 fs/namespace.c:1677 __do_sys_umount fs/namespace.c:1709 [inline] __se_sys_umount fs/namespace.c:1707 [inline] __x64_sys_umount+0x3a/0x50 fs/namespace.c:1707 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: 4419 Comm: syz-executor.2 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================