R13: 00007ff800be6038 R14: 00007ff800be5fa0 R15: 00007ffc145df6c8
 </TASK>
------------[ cut here ]------------
ida_free called for id=1175 which is not allocated.
WARNING: CPU: 1 PID: 8933 at lib/idr.c:592 ida_free+0x1f9/0x2e0 lib/idr.c:592
Modules linked in:
CPU: 1 UID: 0 PID: 8933 Comm: syz.1.635 Tainted: G     U              syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:ida_free+0x1f9/0x2e0 lib/idr.c:592
Code: 76 f6 41 83 fe 3e 76 72 e8 24 78 76 f6 48 8b 7c 24 28 4c 89 ee e8 07 39 0d 00 90 48 c7 c7 00 ba cf 8c 89 ee e8 e8 52 35 f6 90 <0f> 0b 90 90 e8 fe 77 76 f6 48 b8 00 00 00 00 00 fc ff df 48 01 c3
RSP: 0018:ffffc9000b457c60 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 1ffff9200168af8d RCX: ffffc9000baba000
RDX: 0000000000080000 RSI: ffffffff81796535 RDI: 0000000000000001
RBP: 0000000000000497 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802f332400
R13: 0000000000000283 R14: 0000000000000097 R15: ffff88802f332410
FS:  00007ff80175c6c0(0000) GS:ffff888124f5d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31b06ff8 CR3: 000000007c8f8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 copy_mnt_ns+0x886/0xa90 fs/namespace.c:4168
 create_new_namespaces+0xd3/0xa90 kernel/nsproxy.c:78
 unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:218
 ksys_unshare+0x45b/0xa40 kernel/fork.c:3132
 __do_sys_unshare kernel/fork.c:3203 [inline]
 __se_sys_unshare kernel/fork.c:3201 [inline]
 __x64_sys_unshare+0x31/0x40 kernel/fork.c:3201
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff80098eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff80175c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007ff800be5fa0 RCX: 00007ff80098eec9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000020000
RBP: 00007ff800a11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff800be6038 R14: 00007ff800be5fa0 R15: 00007ffc145df6c8
 </TASK>