------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:311 at __ns_ref_active_put include/linux/ns_common.h:311 [inline], CPU#0: syz.2.151/6494
WARNING: ./include/linux/ns_common.h:311 at nsproxy_ns_active_put+0xa19/0xd30 fs/nsfs.c:707, CPU#0: syz.2.151/6494
Modules linked in:
CPU: 0 UID: 0 PID: 6494 Comm: syz.2.151 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__ns_ref_active_put include/linux/ns_common.h:311 [inline]
RIP: 0010:nsproxy_ns_active_put+0xa19/0xd30 fs/nsfs.c:707
Code: 0f 0b 90 e9 71 fc ff ff e8 44 33 77 ff 90 0f 0b 90 e9 ab fc ff ff e8 36 33 77 ff 90 0f 0b 90 e9 41 fd ff ff e8 28 33 77 ff 90 <0f> 0b 90 e9 64 fd ff ff e8 1a 33 77 ff 90 0f 0b 90 e9 98 fd ff ff
RSP: 0018:ffffc9000217fa58 EFLAGS: 00010293
RAX: ffffffff824a29e8 RBX: ffff88801d2972d8 RCX: ffff888026028000
RDX: 0000000000000000 RSI: 00000000effffff8 RDI: 00000000effffff8
RBP: 00000000effffff8 R08: ffffffff8e36ed0b R09: 1ffffffff1c6dda1
R10: dffffc0000000000 R11: fffffbfff1c6dda2 R12: dffffc0000000000
R13: 1ffffffff1c6dd8d R14: ffffffff8e36ec40 R15: ffffffff8e36ec68
FS:  0000000000000000(0000) GS:ffff888125a83000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1b071e6038 CR3: 000000007edda000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 free_nsproxy+0x26/0x560 kernel/nsproxy.c:190
 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: 0033:0x7fdcabfc1f85
Code: Unable to access opcode bytes at 0x7fdcabfc1f5b.
RSP: 002b:00007fdcacdfaf80 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007fdcac1e5fa0 RCX: 00007fdcabfc1f85
RDX: 00007fdcacdfafc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fdcac011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007fdcac1e6038 R14: 00007fdcac1e5fa0 R15: 00007fff3a3808e8
 </TASK>