------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#1: ksoftirqd/1/23
WARNING: ./include/linux/ns_common.h:255 at put_pid_ns+0x113/0x150 kernel/pid_namespace.c:187, CPU#1: ksoftirqd/1/23
Modules linked in:
CPU: 1 UID: 0 PID: 23 Comm: ksoftirqd/1 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_pid_ns+0x113/0x150 kernel/pid_namespace.c:187
Code: c6 cc ff bf 01 00 00 00 89 ee e8 38 b9 03 00 85 ed 7e 1c e8 ef b4 03 00 5b 41 5e 41 5f 5d c3 cc cc cc cc cc e8 de b4 03 00 90 <0f> 0b 90 eb 95 e8 d3 b4 03 00 4c 89 f7 be 03 00 00 00 5b 41 5e 41
RSP: 0018:ffffc900001d7898 EFLAGS: 00010246
RAX: ffffffff81bda832 RBX: ffff88807e310ac0 RCX: ffff88801da9db80
RDX: 0000000000000100 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff88807e310c2b R09: 1ffff1100fc62185
R10: dffffc0000000000 R11: ffffed100fc62186 R12: ffffffff818c9640
R13: ffffffff81a8f607 R14: ffff88807e310c28 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125b83000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faead5e7dac CR3: 000000005e052000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rcu_do_batch kernel/rcu/tree.c:2605 [inline]
 rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861
 handle_softirqs+0x286/0x870 kernel/softirq.c:626
 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1067
 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>