RBP: 00007fbe13417090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fbe13806038 R14: 00007fbe13805fa0 R15: 00007ffe0fdc6bd8
 </TASK>
------------[ cut here ]------------
ida_free called for id=726 which is not allocated.
WARNING: CPU: 1 PID: 1986 at lib/idr.c:592 ida_free+0x107/0x150 lib/idr.c:592
Modules linked in:
CPU: 1 UID: 0 PID: 1986 Comm: syz.1.22 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:ffffc900017e7da0 EFLAGS: 00010246
RAX: 6a027983d43a2d00 RBX: 0000000000000286 RCX: 0000000000000000
RDX: 7e26f13f8bf2fba7 RSI: ffffffff8254bc32 RDI: 00000000ffffffff
RBP: 00000000000002d6 R08: 0000000000080000 R09: 000000000000000d
R10: 0000000000000000 R11: 00000000ffffdfff R12: ffff88810134e700
R13: ffff88810ce8a840 R14: 00000000000002d6 R15: ffff888101b59e00
FS:  00007fbe134176c0(0000) GS:ffff8882b4ada000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbe13807dac CR3: 000000010ff6e000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 copy_mnt_ns+0xbe/0x2f0 fs/namespace.c:4157
 create_new_namespaces+0x51/0x200 kernel/nsproxy.c:78
 unshare_nsproxy_namespaces+0x79/0xa0 kernel/nsproxy.c:218
 ksys_unshare+0x1da/0x350 kernel/fork.c:3127
 __do_sys_unshare kernel/fork.c:3198 [inline]
 __se_sys_unshare kernel/fork.c:3196 [inline]
 __x64_sys_unshare+0xd/0x20 kernel/fork.c:3196
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0x2f0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbe135aeec9
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:00007fbe13417038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fbe13805fa0 RCX: 00007fbe135aeec9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000002a020400
RBP: 00007fbe13417090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fbe13806038 R14: 00007fbe13805fa0 R15: 00007ffe0fdc6bd8
 </TASK>