syzbot

Oops: stack segment: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 11481 Comm: syz.0.2454 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:is_ns_init_id include/linux/ns_common.h:25 [inline]
RIP: 0010:__ns_ref_put include/linux/ns_common.h:70 [inline]
RIP: 0010:put_net include/net/net_namespace.h:292 [inline]
RIP: 0010:nsproxy_free+0x40a/0x7c0 kernel/nsproxy.c:72
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 90 c2 99 00 4d 8b 36 4d 85 f6 0f 84 df 00 00 00 4d 8d be 78 01 00 00 4c 89 fd 48 c1 ed 03 <42> 80 7c 2d 00 00 74 08 4c 89 ff e8 66 c2 99 00 4d 8b 27 31 ff 4c
RSP: 0018:ffffc9000b0e7d08 EFLAGS: 00010207
RAX: 1ffff1100c0ae8e2 RBX: ffff8880605746e8 RCX: 0000000000080000
RDX: ffffc9001aca9000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 000000000000002e R08: ffff888029bcde1f R09: 1ffff11005379bc3
R10: dffffc0000000000 R11: ffffed1005379bc4 R12: 00000000000000c3
R13: dffffc0000000000 R14: fffffffffffffffc R15: 0000000000000174
FS:  00007f3f2b7b26c0(0000) GS:ffff888125b78000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f44a669ba10 CR3: 000000002e400000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 __free_nsproxy_free kernel/nsproxy.c:76 [inline]
 create_new_namespaces+0x47a/0x540 kernel/nsproxy.c:132
 unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:197
 ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3129
 __do_sys_unshare kernel/fork.c:3200 [inline]
 __se_sys_unshare kernel/fork.c:3198 [inline]
 __x64_sys_unshare+0x38/0x50 kernel/fork.c:3198
 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: 0033:0x7f3f2d98f6c9
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:00007f3f2b7b2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f3f2dbe6270 RCX: 00007f3f2d98f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040020000
RBP: 00007f3f2da11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3f2dbe6308 R14: 00007f3f2dbe6270 R15: 00007ffefc3d93a8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:is_ns_init_id include/linux/ns_common.h:25 [inline]
RIP: 0010:__ns_ref_put include/linux/ns_common.h:70 [inline]
RIP: 0010:put_net include/net/net_namespace.h:292 [inline]
RIP: 0010:nsproxy_free+0x40a/0x7c0 kernel/nsproxy.c:72
Code: 03 42 80 3c 28 00 74 08 4c 89 f7 e8 90 c2 99 00 4d 8b 36 4d 85 f6 0f 84 df 00 00 00 4d 8d be 78 01 00 00 4c 89 fd 48 c1 ed 03 <42> 80 7c 2d 00 00 74 08 4c 89 ff e8 66 c2 99 00 4d 8b 27 31 ff 4c
RSP: 0018:ffffc9000b0e7d08 EFLAGS: 00010207
RAX: 1ffff1100c0ae8e2 RBX: ffff8880605746e8 RCX: 0000000000080000
RDX: ffffc9001aca9000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 000000000000002e R08: ffff888029bcde1f R09: 1ffff11005379bc3
R10: dffffc0000000000 R11: ffffed1005379bc4 R12: 00000000000000c3
R13: dffffc0000000000 R14: fffffffffffffffc R15: 0000000000000174
FS:  00007f3f2b7b26c0(0000) GS:ffff888125b78000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f44a669ba10 CR3: 000000002e400000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
   0:	03 42 80             	add    -0x80(%rdx),%eax
   3:	3c 28                	cmp    $0x28,%al
   5:	00 74 08 4c          	add    %dh,0x4c(%rax,%rcx,1)
   9:	89 f7                	mov    %esi,%edi
   b:	e8 90 c2 99 00       	call   0x99c2a0
  10:	4d 8b 36             	mov    (%r14),%r14
  13:	4d 85 f6             	test   %r14,%r14
  16:	0f 84 df 00 00 00    	je     0xfb
  1c:	4d 8d be 78 01 00 00 	lea    0x178(%r14),%r15
  23:	4c 89 fd             	mov    %r15,%rbp
  26:	48 c1 ed 03          	shr    $0x3,%rbp
* 2a:	42 80 7c 2d 00 00    	cmpb   $0x0,0x0(%rbp,%r13,1) <-- trapping instruction
  30:	74 08                	je     0x3a
  32:	4c 89 ff             	mov    %r15,%rdi
  35:	e8 66 c2 99 00       	call   0x99c2a0
  3a:	4d 8b 27             	mov    (%r15),%r12
  3d:	31 ff                	xor    %edi,%edi
  3f:	4c                   	rex.WR