------------[ cut here ]------------ WARNING: CPU: 0 PID: 13548 at fs/namespace.c:1186 mntput_no_expire+0xaca/0xcb0 fs/namespace.c:1186 Modules linked in: CPU: 0 PID: 13548 Comm: syz-executor.5 Not tainted 5.12.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:mntput_no_expire+0xaca/0xcb0 fs/namespace.c:1186 Code: ff 48 c7 c2 e0 cb 78 89 be c2 02 00 00 48 c7 c7 a0 cb 78 89 c6 05 e5 6d e5 0b 01 e8 ff e1 f6 06 e9 3f fd ff ff e8 c6 a5 a8 ff <0f> 0b e9 fc fc ff ff e8 ba a5 a8 ff e8 55 dc 94 ff 31 ff 89 c5 89 RSP: 0018:ffffc900170cfa38 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 1ffff92002e19f4d RCX: 0000000000000000 RDX: ffff888021ab0000 RSI: ffffffff81cb4b8a RDI: 0000000000000003 RBP: ffff888013f95500 R08: 0000000000000000 R09: ffffffff8fa978af R10: ffffffff81cb4884 R11: 0000000000000000 R12: 0000000000000008 R13: ffffc900170cfa88 R14: dffffc0000000000 R15: 00000000ffffffff FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1286724718 CR3: 000000005b3f9000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mntput fs/namespace.c:1232 [inline] cleanup_mnt+0x523/0x530 fs/namespace.c:1132 task_work_run+0xdd/0x1a0 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xbfc/0x2a60 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2150 kernel/signal.c:2781 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789 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+0x148/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x466459 Code: Unable to access opcode bytes at RIP 0x46642f. RSP: 002b:00007fac6202b218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000056c010 RCX: 0000000000466459 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056c010 RBP: 000000000056c008 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c014 R13: 0000000000a9fb1f R14: 00007fac6202b300 R15: 0000000000022000