Oops: general protection fault, probably for non-canonical address 0xdffffc000000002e: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000170-0x0000000000000177]
CPU: 1 UID: 0 PID: 5017 Comm: syz-executor.4 Not tainted 6.18.0-rc5-next-20251112 #1 PREEMPT(voluntary) 
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:nsproxy_free+0x28a/0x5a0
Code: 02 00 00 4c 8b 65 28 4d 85 e4 74 43 e8 4f 47 30 00 49 8d bc 24 78 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 f7 02 00 00 49 8b 9c 24 78 01 00 00 bf 08 00 00
RSP: 0018:ffff88801421fdc8 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: 0000000000000002 RCX: ffffc9000e05b000
RDX: 000000000000002e RSI: ffffffff81447b61 RDI: 0000000000000174
RBP: ffff88800974fbc8 R08: 0000000000000001 R09: ffffed1001886f03
R10: 0000000000000002 R11: ffff88806cf37298 R12: fffffffffffffffc
R13: ffff88800c43781c R14: ffffffff85cfbf20 R15: ffff88804a343ff8
FS:  00007f415dc18700(0000) GS:ffff8880e5497000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c17baf7bc0 CR3: 000000000cff8000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 create_new_namespaces+0x585/0x750
 unshare_nsproxy_namespaces+0xc0/0x200
 ksys_unshare+0x468/0xa10
 __x64_sys_unshare+0x31/0x40
 do_syscall_64+0xbf/0x430
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f41606c3b19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f415dc18188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f41607d7020 RCX: 00007f41606c3b19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000064040080
RBP: 00007f416071df6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe7b62899f R14: 00007f415dc18300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:nsproxy_free+0x28a/0x5a0
Code: 02 00 00 4c 8b 65 28 4d 85 e4 74 43 e8 4f 47 30 00 49 8d bc 24 78 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 f7 02 00 00 49 8b 9c 24 78 01 00 00 bf 08 00 00
RSP: 0018:ffff88801421fdc8 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: 0000000000000002 RCX: ffffc9000e05b000
RDX: 000000000000002e RSI: ffffffff81447b61 RDI: 0000000000000174
RBP: ffff88800974fbc8 R08: 0000000000000001 R09: ffffed1001886f03
R10: 0000000000000002 R11: ffff88806cf37298 R12: fffffffffffffffc
R13: ffff88800c43781c R14: ffffffff85cfbf20 R15: ffff88804a343ff8
FS:  00007f415dc18700(0000) GS:ffff8880e5497000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c17baf7bc0 CR3: 000000000cff8000 CR4: 0000000000350ef0
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
tmpfs: Unknown parameter '0x0000000000000000'
tmpfs: Unknown parameter '0x0000000000000000'
tmpfs: Bad value for 'mpol'
tmpfs: Bad value for 'mpol'
loop3: detected capacity change from 0 to 192
loop3: detected capacity change from 0 to 192
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
program syz-executor.3 is using a deprecated SCSI ioctl, please convert it to SG_IO
loop7: detected capacity change from 0 to 512
ext4: Unknown parameter 'smackf'
loop7: detected capacity change from 0 to 512
ext4: Unknown parameter 'smackf'
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
misc raw-gadget: fail, usb_gadget_register_driver returned -16
----------------
Code disassembly (best guess):
   0:	02 00                	add    (%rax),%al
   2:	00 4c 8b 65          	add    %cl,0x65(%rbx,%rcx,4)
   6:	28 4d 85             	sub    %cl,-0x7b(%rbp)
   9:	e4 74                	in     $0x74,%al
   b:	43 e8 4f 47 30 00    	rex.XB callq 0x304760
  11:	49 8d bc 24 78 01 00 	lea    0x178(%r12),%rdi
  18:	00
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 f7 02 00 00    	jne    0x32b
  34:	49 8b 9c 24 78 01 00 	mov    0x178(%r12),%rbx
  3b:	00
  3c:	bf                   	.byte 0xbf
  3d:	08 00                	or     %al,(%rax)