RBP: 00007fa0b832f090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fa0b8716038 R14: 00007fa0b8715fa0 R15: 00007fffb1069758
 </TASK>
------------[ cut here ]------------
ida_free called for id=424 which is not allocated.
WARNING: CPU: 1 PID: 2867 at lib/idr.c:592 ida_free+0x107/0x150 lib/idr.c:592
Modules linked in:
CPU: 1 UID: 0 PID: 2867 Comm: syz.3.17 Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:ida_free+0x107/0x150 lib/idr.c:592
Code: 21 d0 74 2c 48 8d 34 45 01 00 00 00 eb 24 48 8b 3c 24 48 89 de e8 29 f7 03 00 90 48 c7 c7 4b 22 4e 82 89 ee e8 1a 65 26 ff 90 <0f> 0b 90 90 eb 16 31 f6 48 89 e7 e8 a9 44 02 00 48 8b 3c 24 48 89
RSP: 0018:ffffc90002073c78 EFLAGS: 00010246
RAX: 89283fd7100bd200 RBX: 0000000000000286 RCX: 0000000000000000
RDX: 0000000000000002 RSI: 00000000ffffdfff RDI: 00000000ffffffff
RBP: 00000000000001a8 R08: 0000000000001fff R09: ffffffff8289aab0
R10: 0000000000005ffd R11: 00000000ffffdfff R12: 0000000000000000
R13: ffff8881013b5a98 R14: 00000000000001a8 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8882b4ada000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa0b8448750 CR3: 0000000002848000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 free_mnt_ns+0x15/0x60 fs/namespace.c:4085
 namespace_unlock+0x1de/0x280 fs/namespace.c:1692
 free_nsproxy+0x11/0x130 kernel/nsproxy.c:188
 do_exit+0x22d/0x970 kernel/exit.c:960
 do_group_exit+0x88/0xa0 kernel/exit.c:1102
 get_signal+0x658/0x6b0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8a/0x2a0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x70/0xd0 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x201/0x2f0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa0b84beec9
Code: Unable to access opcode bytes at 0x7fa0b84bee9f.
RSP: 002b:00007fa0b832f0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fa0b8715fa8 RCX: 00007fa0b84beec9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fa0b8715fa8
RBP: 00007fa0b8715fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa0b8716038 R14: 00007fffb1069670 R15: 00007fffb1069758
 </TASK>