------------[ cut here ]------------
WARNING: CPU: 1 PID: 8644 at fs/namespace.c:1186 mntput_no_expire+0xada/0xcd0 fs/namespace.c:1186
Modules linked in:
CPU: 1 PID: 8644 Comm: syz-executor.5 Not tainted 5.14.0-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: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 45 fc eb ff 4c 8b 44 24 10 e9 9d fe ff ff e8 76 c9 a5 ff <0f> 0b e9 19 fd ff ff e8 6a c9 a5 ff e8 f5 79 5a 07 31 ff 89 c5 89
RSP: 0018:ffffc900019dfc38 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff9200033bf8d RCX: 0000000000000000
RDX: ffff888011c79c40 RSI: ffffffff81cfe25a RDI: 0000000000000003
RBP: ffff8880166ab380 R08: 0000000000000000 R09: ffffffff8fcd48af
R10: ffffffff81cfdf71 R11: 0000000000000000 R12: 0000000000000008
R13: ffffc900019dfc88 R14: 00000000ffffffff R15: 0000000000000002
FS:  0000000002252400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000005451f8 CR3: 000000001d3a1000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 mntput fs/namespace.c:1232 [inline]
 namespace_unlock+0x26b/0x410 fs/namespace.c:1451
 do_umount fs/namespace.c:1670 [inline]
 path_umount+0x797/0x1260 fs/namespace.c:1756
 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: 0033:0x467a47
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:00007ffd105b8fd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000467a47
RDX: 00007ffd105b90ab RSI: 0000000000000002 RDI: 00007ffd105b90a0
RBP: 00007ffd105b90a0 R08: 00000000ffffffff R09: 00007ffd105b8e70
R10: 00000000022538e3 R11: 0000000000000246 R12: 00000000004bee90
R13: 00007ffd105ba170 R14: 0000000002253810 R15: 00007ffd105ba1b0