lo speed is unknown, defaulting to 1000
------------[ cut here ]------------
WARNING: CPU: 1 PID: 14437 at fs/namespace.c:1187 mntput_no_expire+0xada/0xcd0 fs/namespace.c:1187
Modules linked in:
CPU: 1 PID: 14437 Comm: syz-executor.2 Not tainted 5.16.0-rc2-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 e5 48 ec ff 4c 8b 44 24 10 e9 9d fe ff ff e8 a6 8b a5 ff <0f> 0b e9 19 fd ff ff e8 9a 8b a5 ff e8 d5 f4 71 07 31 ff 89 c5 89
RSP: 0018:ffffc900028af9c0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff92000515f3e RCX: 0000000000000000
RDX: ffff888025de1d00 RSI: ffffffff81d20dba RDI: 0000000000000003
RBP: ffff88807ce77980 R08: 0000000000000000 R09: ffffffff8ff72a0f
R10: ffffffff81d20ad1 R11: 0000000000000000 R12: 0000000000000008
R13: ffffc900028afa10 R14: 0000000082a040ff R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555557a9848 CR3: 0000000049560000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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+0xad/0xc0 kernel/nsproxy.c:249
 do_exit+0xc0f/0x2b40 kernel/exit.c:831
 do_group_exit+0x125/0x310 kernel/exit.c:929
 get_signal+0x47d/0x2220 kernel/signal.c:2852
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f648ec85ae9
Code: Unable to access opcode bytes at RIP 0x7f648ec85abf.
RSP: 002b:00007f648c1fb188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: 0000000000000000 RBX: 00007f648ed98f60 RCX: 00007f648ec85ae9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006c060000
RBP: 00007f648ecdff6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd14ab2dbf R14: 00007f648c1fb300 R15: 0000000000022000
 </TASK>