------------[ cut here ]------------
WARNING: CPU: 0 PID: 15562 at fs/namespace.c:1186 mntput_no_expire+0xada/0xcd0 fs/namespace.c:1186
Modules linked in:
CPU: 0 PID: 15562 Comm: syz-executor.4 Not tainted 5.14.0-rc6-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:1186
Code: 30 84 c0 0f 84 b9 fe ff ff 3c 03 0f 8f b1 fe ff ff 4c 89 44 24 10 e8 75 f8 eb ff 4c 8b 44 24 10 e9 9d fe ff ff e8 d6 ba a5 ff <0f> 0b e9 19 fd ff ff e8 ca ba a5 ff e8 45 8c 5a 07 31 ff 89 c5 89
RSP: 0018:ffffc9000226fcf0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff9200044dfa4 RCX: 0000000000000000
RDX: ffff88801dfe3880 RSI: ffffffff81cfee2a RDI: 0000000000000003
RBP: ffff888036f3ed80 R08: 0000000000000000 R09: ffffffff8fcd48ef
R10: ffffffff81cfeb41 R11: 0000000000000000 R12: 0000000000000008
R13: ffffc9000226fd40 R14: 00000000ffffffff R15: 0000000000000002
FS:  0000000003241400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000540198 CR3: 0000000027ab2000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 path_umount+0x7d4/0x1260 fs/namespace.c:1760
 ksys_umount fs/namespace.c:1779 [inline]
 __do_sys_umount fs/namespace.c:1784 [inline]
 __se_sys_umount fs/namespace.c:1782 [inline]
 __x64_sys_umount+0x159/0x180 fs/namespace.c:1782
 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:00007fff10c0fbd8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000467a57
RDX: 00007fff10c0fcab RSI: 0000000000000002 RDI: 00007fff10c0fca0
RBP: 00007fff10c0fca0 R08: 00000000ffffffff R09: 00007fff10c0fa70
R10: 00000000032428e3 R11: 0000000000000206 R12: 00000000004bee90
R13: 00007fff10c10d70 R14: 0000000003242810 R15: 00007fff10c10db0