------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#1: syz.1.35/6090
WARNING: ./include/linux/ns_common.h:255 at put_user_ns include/linux/user_namespace.h:189 [inline], CPU#1: syz.1.35/6090
WARNING: ./include/linux/ns_common.h:255 at put_cred_rcu+0x2c5/0x340 kernel/cred.c:61, CPU#1: syz.1.35/6090
Modules linked in:
CPU: 1 UID: 0 PID: 6090 Comm: syz.1.35 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_user_ns include/linux/user_namespace.h:189 [inline]
RIP: 0010:put_cred_rcu+0x2c5/0x340 kernel/cred.c:61
Code: 5c 41 5d 41 5e 41 5f 5d e9 b8 25 8e 00 e8 13 a7 32 00 4c 89 e7 be 03 00 00 00 e8 a6 02 02 03 e9 b8 fe ff ff e8 fc a6 32 00 90 <0f> 0b 90 eb 9f e8 f1 a6 32 00 4c 89 ff be 03 00 00 00 e8 84 02 02
RSP: 0018:ffffc90000a08c48 EFLAGS: 00010246
RAX: ffffffff818ed934 RBX: ffff88802ba46ca0 RCX: ffff888025dd5b80
RDX: 0000000000000100 RSI: 0000000000000004 RDI: 0000000000000000
RBP: 0000000000000004 R08: ffff888054db8193 R09: 1ffff1100a9b7032
R10: dffffc0000000000 R11: ffffed100a9b7033 R12: dffffc0000000000
R13: ffff88802ba46c00 R14: ffff888054db8000 R15: ffff888054db8190
FS:  0000555564cdb500(0000) GS:ffff888125fc2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555564cee588 CR3: 0000000077984000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 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
 do_softirq+0xec/0x180 kernel/softirq.c:523
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:450
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 fpregs_unlock arch/x86/include/asm/fpu/api.h:77 [inline]
 fpu_clone+0x53f/0xbb0 arch/x86/kernel/fpu/core.c:692
 copy_thread+0x3f5/0x9a0 arch/x86/kernel/process.c:226
 copy_process+0x1808/0x3930 kernel/fork.c:2189
 kernel_clone+0x21e/0x840 kernel/fork.c:2609
 __do_sys_clone3 kernel/fork.c:2911 [inline]
 __se_sys_clone3+0x256/0x2d0 kernel/fork.c:2890
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5b95bc3e09
Code: cf 08 00 48 8d 3d dc cf 08 00 e8 e2 28 f6 ff 66 90 b8 ea ff ff ff 48 85 ff 74 2c 48 85 d2 74 27 49 89 c8 b8 b3 01 00 00 0f 05 <48> 85 c0 7c 18 74 01 c3 31 ed 48 83 e4 f0 4c 89 c7 ff d2 48 89 c7
RSP: 002b:00007ffdf37a0818 EFLAGS: 00000206 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007f5b95b461f0 RCX: 00007f5b95bc3e09
RDX: 00007f5b95b461f0 RSI: 0000000000000058 RDI: 00007ffdf37a0860
RBP: 00007f5b96a596c0 R08: 00007f5b96a596c0 R09: 00007ffdf37a0947
R10: 0000000000000008 R11: 0000000000000206 R12: ffffffffffffffa8
R13: 000000000000000b R14: 00007ffdf37a0860 R15: 00007ffdf37a0948
 </TASK>