------------[ cut here ]------------
WARNING: fs/namespace.c:1434 at mntput_no_expire+0x78e/0xbe0, CPU#0: syz-executor.5/4060
Modules linked in:
CPU: 0 UID: 0 PID: 4060 Comm: syz-executor.5 Tainted: G        W           6.17.0-rc4-next-20250901 #1 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:mntput_no_expire+0x78e/0xbe0
Code: 05 d6 30 81 04 01 e8 71 df 91 ff e9 41 fc ff ff e8 27 47 b4 ff 31 ff 44 89 ee e8 4d 42 b4 ff 45 85 ed 79 09 e8 13 47 b4 ff 90 <0f> 0b 90 e8 0a 47 b4 ff e8 b5 2d fc 02 31 ff 89 c5 89 c6 e8 2a 42
RSP: 0018:ffff8880467af9b8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff11008cf5f3c RCX: ffffffff81bfaf93
RDX: ffff888046098000 RSI: ffffffff81bfaf9d RDI: 0000000000000005
RBP: ffff88801fee0a80 R08: 0000000000000001 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000001 R12: ffff8880467afa20
R13: 00000000ffffffff R14: dead000000000100 R15: ffff88801fee0a80
FS:  0000000000000000(0000) GS:ffff8880e55d8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d42e000 CR3: 000000004370a000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 namespace_unlock+0x7f1/0x810
 put_mnt_ns+0xf5/0x120
 free_nsproxy+0x3a/0x400
 switch_task_namespaces+0xe2/0x100
 do_exit+0x841/0x2970
 do_group_exit+0xd3/0x2a0
 get_signal+0x2315/0x2340
 arch_do_signal_or_restart+0x80/0x790
 irqentry_exit_to_user_mode+0x106/0x1c0
 exc_page_fault+0xd9/0x180
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0xe
Code: Unable to access opcode bytes at 0xffffffffffffffe4.
RSP: 002b:00007fa752f24190 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fa755ae3020 RCX: 00007fa7559cfb19
RDX: 0000000000000000 RSI: 0000000000000058 RDI: 00000000200002c0
RBP: 00007fa755a29f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdf8bbd51f R14: 00007fa752f24300 R15: 0000000000022000
 </TASK>
irq event stamp: 917
hardirqs last  enabled at (925): [<ffffffff81541b18>] __up_console_sem+0x78/0x80
hardirqs last disabled at (934): [<ffffffff81541afd>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (894): [<ffffffff813bafcc>] handle_softirqs+0x50c/0x770
softirqs last disabled at (879): [<ffffffff813bb364>] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
loop1: detected capacity change from 0 to 512
9pnet_fd: Insufficient options for proto=fd
loop1: detected capacity change from 0 to 512
kmemleak: Found object by alias at 0x607f1a63eb44
CPU: 1 UID: 0 PID: 4061 Comm: syz-executor.1 Tainted: G        W           6.17.0-rc4-next-20250901 #1 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xca/0x120
 __lookup_object+0x94/0xb0
 delete_object_full+0x27/0x70
 free_percpu+0x30/0x1160
 futex_hash_free+0x38/0xc0
 mmput+0x2d3/0x390
 do_exit+0x79d/0x2970
 do_group_exit+0xd3/0x2a0
 get_signal+0x2315/0x2340
 arch_do_signal_or_restart+0x80/0x790
 exit_to_user_mode_loop+0x8b/0x110
 do_syscall_64+0x2f7/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fba12784b19
Code: Unable to access opcode bytes at 0x7fba12784aef.
RSP: 002b:00007fba0fcfa218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fba12897f68 RCX: 00007fba12784b19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fba12897f6c
RBP: 00007fba12897f60 R08: 0000000000000016 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007fba12897f6c
R13: 00007ffea4975dbf R14: 00007fba0fcfa300 R15: 0000000000022000
 </TASK>
kmemleak: Object (percpu) 0x607f1a63eb40 (size 8):
kmemleak:   comm "syz-executor.4", pid 4057, jiffies 4294817771
kmemleak:   min_count = 1
kmemleak:   count = 0
kmemleak:   flags = 0x21
kmemleak:   checksum = 0
kmemleak:   backtrace:
 pcpu_alloc_noprof+0x87a/0x1170
 alloc_vfsmnt+0x135/0x6e0
 vfs_create_mount.part.0+0x40/0x440
 fc_mount_longterm+0x126/0x160
 mq_init_ns+0x42e/0x630
 copy_ipcs+0x38d/0x630
 create_new_namespaces+0x210/0xab0
 copy_namespaces+0x45c/0x580
 copy_process+0x2649/0x73c0
 kernel_clone+0xea/0x7f0
 __do_sys_clone+0xce/0x120
 do_syscall_64+0xbf/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
unregister_netdevice: waiting for lo to become free. Usage count = 0