------------[ cut here ]------------ WARNING: CPU: 0 PID: 15719 at fs/namespace.c:1187 mntput_no_expire+0xada/0xcd0 fs/namespace.c:1187 Modules linked in: CPU: 0 PID: 15719 Comm: syz-executor.3 Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:mntput_no_expire+0xada/0xcd0 fs/namespace.c:1187 Code: 30 84 c0 0f 84 b9 fe ff ff 3c 03 0f 8f b1 fe ff ff 4c 89 44 24 10 e8 05 48 ec ff 4c 8b 44 24 10 e9 9d fe ff ff e8 c6 de a4 ff <0f> 0b e9 19 fd ff ff e8 ba de a4 ff e8 d5 43 73 07 31 ff 89 c5 89 RSP: 0018:ffffc900034efc20 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 1ffff9200069df8a RCX: 0000000000000000 RDX: ffff888011dc8000 RSI: ffffffff81d2cc2a RDI: 0000000000000003 RBP: ffff8880521ff980 R08: 0000000000000000 R09: ffffffff8ff88a0f R10: ffffffff81d2c941 R11: 0000000000000000 R12: 0000000000000008 R13: ffffc900034efc70 R14: 00000000ffffffff R15: 0000000000000002 FS: 00007f10741dc700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc6e9b3f48b CR3: 00000000784a4000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: mntput fs/namespace.c:1233 [inline] namespace_unlock+0x26b/0x410 fs/namespace.c:1452 unlock_mount fs/namespace.c:2274 [inline] do_loopback fs/namespace.c:2409 [inline] path_mount+0xcc7/0x1fa0 fs/namespace.c:3312 do_mount fs/namespace.c:3331 [inline] __do_sys_mount fs/namespace.c:3539 [inline] __se_sys_mount fs/namespace.c:3516 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3516 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f1075887e99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f10741dc168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f107599b030 RCX: 00007f1075887e99 RDX: 0000000000000000 RSI: 00000000200003c0 RDI: 0000000020000000 RBP: 00007f10758e1ff1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000002001001 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcce03366f R14: 00007f10741dc300 R15: 0000000000022000