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ida_free called for id=2218 which is not allocated.
WARNING: CPU: 0 PID: 13585 at lib/idr.c:592 ida_free+0x280/0x310 lib/idr.c:592
Modules linked in:
CPU: 0 UID: 0 PID: 13585 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:ida_free+0x280/0x310 lib/idr.c:592
Code: 00 00 00 00 fc ff df 48 8b 5c 24 10 48 8b 7c 24 40 48 89 de e8 21 50 0c 00 90 48 c7 c7 40 ce 94 8c 44 89 fe e8 11 30 47 f6 90 <0f> 0b 90 90 eb 34 e8 65 13 84 f6 49 bd 00 00 00 00 00 fc ff df eb
RSP: 0018:ffffc9001aad7ac0 EFLAGS: 00010246
RAX: e4114ddc5a9e6e00 RBX: 0000000000000a06 RCX: ffff88807b849e40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc9001aad7ba8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa138 R12: 1ffff9200355af5c
R13: dffffc0000000000 R14: ffff88805c4b8400 R15: 00000000000008aa
FS:  0000000000000000(0000) GS:ffff888125d3b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557f6fcae498 CR3: 000000000df36000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 free_mnt_ns+0x52/0xe0 fs/namespace.c:4096
 namespace_unlock+0x529/0x760 fs/namespace.c:1701
 free_nsproxy+0x3e/0x350 kernel/nsproxy.c:188
 do_exit+0x6b0/0x2300 kernel/exit.c:960
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
 __do_sys_exit_group kernel/exit.c:1113 [inline]
 __se_sys_exit_group kernel/exit.c:1111 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
 x64_sys_call+0x21f7/0x2200 arch/x86/include/generated/asm/syscalls_64.h:232
 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: 0033:0x7f68cad8eec9
Code: Unable to access opcode bytes at 0x7f68cad8ee9f.
RSP: 002b:00007ffd7905dab8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f68cae137cb RCX: 00007f68cad8eec9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043
RBP: 00007f68cae137dd R08: 00007ffd7905b857 R09: 00000000000927c0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006
R13: 00000000000927c0 R14: 000000000009e844 R15: 00007ffd7905dc60
 </TASK>