------------[ cut here ]------------
WARNING: CPU: 0 PID: 20305 at fs/namespace.c:1187 mntput_no_expire+0xada/0xcd0 fs/namespace.c:1187
Modules linked in:
CPU: 0 PID: 20305 Comm: syz-executor.2 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:ffffc900028bfc38 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff92000517f8d RCX: 0000000000000000
RDX: ffff88804a529d00 RSI: ffffffff81d2cc2a RDI: 0000000000000003
RBP: ffff888053fdcf00 R08: 0000000000000000 R09: ffffffff8ff88a0f
R10: ffffffff81d2c941 R11: 0000000000000000 R12: 0000000000000008
R13: ffffc900028bfc88 R14: 00000000ffffffff R15: 0000000000000002
FS:  000055555739e400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000100 CR3: 0000000025824000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 mntput fs/namespace.c:1233 [inline]
 namespace_unlock+0x3ee/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: 0033:0x7ff208a8a307
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 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:00007fff9a89bda8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff208a8a307
RDX: 00007fff9a89be7c RSI: 000000000000000a RDI: 00007fff9a89be70
RBP: 00007fff9a89be70 R08: 00000000ffffffff R09: 00007fff9a89bc40
R10: 000055555739f8b3 R11: 0000000000000206 R12: 00007ff208ae2172
R13: 00007fff9a89cf30 R14: 000055555739f810 R15: 00007fff9a89cf70
 </TASK>