------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#1: syz.1.1239/10025
WARNING: ./include/linux/ns_common.h:255 at put_mnt_ns+0x152/0x190 fs/namespace.c:6048, CPU#1: syz.1.1239/10025
Modules linked in:
CPU: 1 UID: 0 PID: 10025 Comm: syz.1.1239 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__ns_ref_put include/linux/ns_common.h:255 [inline]
RIP: 0010:put_mnt_ns+0x152/0x190 fs/namespace.c:6048
Code: 79 00 00 bf 01 00 00 00 89 ee e8 09 17 7e ff 85 ed 7e 1f e8 c0 12 7e ff 5b 41 5e 41 5f 5d e9 c5 83 21 09 cc e8 af 12 7e ff 90 <0f> 0b 90 e9 33 ff ff ff e8 a1 12 7e ff 4c 89 f7 be 03 00 00 00 5b
RSP: 0018:ffffc9000b717a68 EFLAGS: 00010293
RAX: ffffffff82434a61 RBX: ffff8880271d1400 RCX: ffff88804d8c5b80
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff8880271d14bb R09: 1ffff11004e3a297
R10: dffffc0000000000 R11: ffffed1004e3a298 R12: dffffc0000000000
R13: 0000000000000009 R14: ffff8880271d14b8 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125b83000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555903b7808 CR3: 000000007e7b4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 free_nsproxy+0x46/0x560 kernel/nsproxy.c:192
 do_exit+0x6b8/0x2300 kernel/exit.c:969
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1111
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2e9/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 00fb:0x294e66b3c7c44cb4
Code: Unable to access opcode bytes at 0x294e66b3c7c44c8a.
RSP: 002b:0000000000000000 EFLAGS: 00000202 ORIG_RAX: ce3d5c200518e753
RAX: 6d02b596a6d6b2c6 RBX: 46b00e13ac8c17fa RCX: 1d6d567492f1521e
RDX: eb30e365dd53f3a0 RSI: c553273f825e1cf7 RDI: b331ef28487276fd
RBP: 9c8c87e20081ee76 R08: cf9d780a350b4549 R09: c7e58b697db8ef3d
R10: d68d02d45a22dc24 R11: 19b4d49ef33da9ed R12: 39cb75b6fa6cb3d1
R13: a8d7b5dbf29d588f R14: 9ba473c1014f02b4 R15: 107b9d1451766018
 </TASK>