------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:288 at __ns_ref_active_get include/linux/ns_common.h:288 [inline], CPU#0: syz.2.78/6164
WARNING: ./include/linux/ns_common.h:288 at alloc_pid+0xad6/0xc70 kernel/pid.c:285, CPU#0: syz.2.78/6164
Modules linked in:
CPU: 0 UID: 0 PID: 6164 Comm: syz.2.78 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_get include/linux/ns_common.h:288 [inline]
RIP: 0010:alloc_pid+0xad6/0xc70 kernel/pid.c:285
Code: cc e8 ee d4 34 00 be 02 00 00 00 eb 0a e8 e2 d4 34 00 be 01 00 00 00 48 89 df e8 55 82 0c 03 e9 84 fa ff ff e8 cb d4 34 00 90 <0f> 0b 90 e9 2c fd ff ff e8 bd d4 34 00 90 0f 0b 90 e9 5b fd ff ff
RSP: 0018:ffffc9000abf7938 EFLAGS: 00010293
RAX: ffffffff818cf9d5 RBX: ffff88801df04168 RCX: ffff88802f9f0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffff88802cf6f501 R08: ffff88801df0416b R09: 1ffff11003be082d
R10: dffffc0000000000 R11: ffffed1003be082e R12: dffffc0000000000
R13: 1ffff110059edec1 R14: ffff88801df04000 R15: dffffc0000000000
FS:  00005555916c7500(0000) GS:ffff888125a7c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8e72417d58 CR3: 00000000791ec000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 copy_process+0x18e7/0x3930 kernel/fork.c:2196
 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