------------[ cut here ]------------
WARNING: CPU: 0 PID: 7698 at fs/namespace.c:1341 mntput_no_expire+0x9c3/0xb50 fs/namespace.c:1341
Modules linked in:
CPU: 0 PID: 7698 Comm: syz-executor.4 Not tainted 6.1.0-syzkaller-11835-g0471005efac9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:mntput_no_expire+0x9c3/0xb50 fs/namespace.c:1341
Code: 30 84 c0 0f 84 c0 fe ff ff 3c 03 0f 8f b8 fe ff ff 4c 89 44 24 10 e8 ec 4b e8 ff 4c 8b 44 24 10 e9 a4 fe ff ff e8 fd 48 9a ff <0f> 0b e9 20 fd ff ff e8 f1 48 9a ff e8 ac ab 1e 08 31 ff 89 c5 89
RSP: 0018:ffffc9000b7c7a08 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff920016f8f47 RCX: 0000000000000000
RDX: ffff8880201e9d40 RSI: ffffffff81e70913 RDI: 0000000000000005
RBP: ffff88802ac92f00 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000fffffff5 R11: 0000000000000000 R12: ffffc9000b7c7a58
R13: 00000000fffffff5 R14: ffff88802ac92f00 R15: ffffc9000b7c7af0
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6f0975f1d0 CR3: 0000000076faa000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 mntput fs/namespace.c:1387 [inline]
 namespace_unlock+0x26b/0x410 fs/namespace.c:1606
 drop_collected_mounts fs/namespace.c:2089 [inline]
 put_mnt_ns fs/namespace.c:4554 [inline]
 put_mnt_ns+0x10a/0x150 fs/namespace.c:4550
 free_nsproxy+0x47/0x4d0 kernel/nsproxy.c:193
 put_nsproxy include/linux/nsproxy.h:106 [inline]
 switch_task_namespaces+0xb1/0xd0 kernel/nsproxy.c:251
 do_exit+0xaa3/0x2950 kernel/exit.c:866
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1010
 get_signal+0x21c3/0x2450 kernel/signal.c:2859
 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f66fda8c0c9
Code: Unable to access opcode bytes at 0x7f66fda8c09f.
RSP: 002b:00007f66fe8b7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffa2 RBX: 00007f66fdbabf80 RCX: 00007f66fda8c0c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000a
RBP: 00007f66fdae7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe5edde42f R14: 00007f66fe8b7300 R15: 0000000000022000
 </TASK>