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ida_free called for id=981 which is not allocated.
WARNING: CPU: 1 PID: 5838 at lib/idr.c:592 ida_free+0x280/0x310 lib/idr.c:592
Modules linked in:
CPU: 1 UID: 0 PID: 5838 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 71 2c 0c 00 90 48 c7 c7 a0 7b 76 8c 44 89 fe e8 41 11 54 f6 90 <0f> 0b 90 90 eb 34 e8 85 a2 90 f6 49 bd 00 00 00 00 00 fc ff df eb
RSP: 0018:ffffc9000406fac0 EFLAGS: 00010246
RAX: 7e2a7bf8826b6000 RBX: 0000000000000a06 RCX: ffff888027635ac0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc9000406fba8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1b7a138 R12: 1ffff9200080df5c
R13: dffffc0000000000 R14: ffff888140eaa000 R15: 00000000000003d5
FS:  0000000000000000(0000) GS:ffff888126473000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558caad808 CR3: 0000000053aba000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
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/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcaa938eec9
Code: Unable to access opcode bytes at 0x7fcaa938ee9f.
RSP: 002b:00007fff230f4828 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fcaa9411def RCX: 00007fcaa938eec9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000016 R08: 00007fff230f25c6 R09: 00007fff230f5ae0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff230f5ae0
R13: 00007fcaa9411d7d R14: 000055556061e4a8 R15: 00007fff230f8d90
 </TASK>