------------[ cut here ]------------ WARNING: CPU: 1 PID: 8487 at fs/namespace.c:1187 mntput_no_expire+0xada/0xcd0 fs/namespace.c:1187 Modules linked in: CPU: 1 PID: 8487 Comm: syz-executor.3 Not tainted 5.14.0-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 b5 f8 eb ff 4c 8b 44 24 10 e9 9d fe ff ff e8 b6 b7 a4 ff <0f> 0b e9 19 fd ff ff e8 aa b7 a4 ff e8 05 15 63 07 31 ff 89 c5 89 RSP: 0018:ffffc9000171fc38 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 1ffff920002e3f8d RCX: 0000000000000000 RDX: ffff888078991c80 RSI: ffffffff81d1698a RDI: 0000000000000003 RBP: ffff88802880d800 R08: 0000000000000000 R09: ffffffff8fcfc8ef R10: ffffffff81d166a1 R11: 0000000000000000 R12: 0000000000000008 R13: ffffc9000171fc88 R14: 00000000ffffffff R15: 0000000000000002 FS: 0000000003266400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000326f848 CR3: 0000000047cc9000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mntput fs/namespace.c:1233 [inline] namespace_unlock+0x26b/0x410 fs/namespace.c:1452 do_umount fs/namespace.c:1671 [inline] path_umount+0x797/0x1260 fs/namespace.c:1753 ksys_umount fs/namespace.c:1776 [inline] __do_sys_umount fs/namespace.c:1781 [inline] __se_sys_umount fs/namespace.c:1779 [inline] __x64_sys_umount+0x159/0x180 fs/namespace.c:1779 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: 0033:0x467a57 Code: ff d0 48 89 c7 b8 3c 00 00 00 0f 05 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 a6 00 00 00 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:00007fffdb5a89c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000467a57 RDX: 00007fffdb5a8a9b RSI: 0000000000000002 RDI: 00007fffdb5a8a90 RBP: 00007fffdb5a8a90 R08: 00000000ffffffff R09: 00007fffdb5a8860 R10: 00000000032678e3 R11: 0000000000000246 R12: 00000000004bee90 R13: 00007fffdb5a9b60 R14: 0000000003267810 R15: 00007fffdb5a9ba0