------------[ cut here ]------------
WARNING: CPU: 0 PID: 23753 at fs/namespace.c:1187 mntput_no_expire+0xada/0xcd0 fs/namespace.c:1187
Modules linked in:
CPU: 0 PID: 23753 Comm: syz-executor.1 Not tainted 5.15.0-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 85 f9 eb ff 4c 8b 44 24 10 e9 9d fe ff ff e8 16 a4 a4 ff <0f> 0b e9 19 fd ff ff e8 0a a4 a4 ff e8 e5 db 63 07 31 ff 89 c5 89
RSP: 0018:ffffc90002befc18 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff9200057df89 RCX: 0000000000000000
RDX: ffff88807649b900 RSI: ffffffff81d233fa RDI: 0000000000000003
RBP: ffff88806a41a900 R08: 0000000000000000 R09: ffffffff8fcfe9ef
R10: ffffffff81d23111 R11: 0000000000000000 R12: 0000000000000008
R13: ffffc90002befc68 R14: 00000000ffffffff R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555555e7f848 CR3: 000000004ffb1000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 mntput fs/namespace.c:1233 [inline]
 namespace_unlock+0x26b/0x410 fs/namespace.c:1452
 drop_collected_mounts fs/namespace.c:1935 [inline]
 put_mnt_ns fs/namespace.c:4344 [inline]
 put_mnt_ns+0x106/0x140 fs/namespace.c:4340
 free_nsproxy+0x43/0x4c0 kernel/nsproxy.c:191
 put_nsproxy include/linux/nsproxy.h:105 [inline]
 switch_task_namespaces+0xaf/0xd0 kernel/nsproxy.c:249
 do_exit+0xba9/0x2a30 kernel/exit.c:824
 do_group_exit+0x125/0x310 kernel/exit.c:922
 __do_sys_exit_group kernel/exit.c:933 [inline]
 __se_sys_exit_group kernel/exit.c:931 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
 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: 0033:0x7ff4a8324a39
Code: Unable to access opcode bytes at RIP 0x7ff4a8324a0f.
RSP: 002b:00007ffd1fac3248 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007ffd1fac3890 RCX: 00007ff4a8324a39
RDX: 00007ff4a8323b47 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 0000000000000007 R08: 0000000000000005 R09: 00007ffd1fac3890
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000032
R13: 000000000014f6d5 R14: 0000000000000014 R15: 00007ffd1fac38d0