general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]
CPU: 1 PID: 2290 Comm: kworker/1:3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: mld mld_ifc_work
RIP: 0010:dummy_queue+0x1a2/0x8c0 drivers/usb/gadget/udc/dummy_hcd.c:733
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 a7 6a 87 fb 4d 8b 24 24 49 83 c4 60 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 ab 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc90000dd0bd8 EFLAGS: 00010206
RAX: 000000000000000c RBX: ffff8880606d8e10 RCX: dffffc0000000000
RDX: 0000000000000100 RSI: 0000000000000003 RDI: 0000000000000005
RBP: 1ffff1100c0db1c0 R08: ffffffff901ef157 R09: 1ffffffff203de2a
R10: dffffc0000000000 R11: fffffbfff203de2b R12: 0000000000000060
R13: ffff8880606d8e00 R14: ffff8881480200e0 R15: ffff888148020c00
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f997660afe8 CR3: 000000001e450000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 usb_ep_queue+0xe6/0x350 drivers/usb/gadget/udc/core.c:288
 eth_start_xmit+0x83d/0xdb0 drivers/usb/gadget/function/u_ether.c:589
 ncm_tx_timeout+0x80/0x90 drivers/usb/gadget/function/f_ncm.c:1170
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4ea/0xb60 kernel/time/hrtimer.c:1749
 hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1766
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 do_softirq+0x142/0x210 kernel/softirq.c:477
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x180/0x1c0 kernel/softirq.c:401
 rcu_read_unlock_bh include/linux/rcupdate.h:810 [inline]
 ip6_finish_output2+0x111c/0x1530 net/ipv6/ip6_output.c:131
 dst_output include/net/dst.h:452 [inline]
 NF_HOOK+0x163/0x460 include/linux/netfilter.h:302
 mld_sendpack+0x6ee/0xc40 net/ipv6/mcast.c:1853
 mld_send_cr net/ipv6/mcast.c:2152 [inline]
 mld_ifc_work+0x843/0xd60 net/ipv6/mcast.c:2690
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Modules linked in:
vkms_vblank_simulate: vblank timer overrun
---[ end trace c1e6601b02f5b100 ]---
RIP: 0010:dummy_queue+0x1a2/0x8c0 drivers/usb/gadget/udc/dummy_hcd.c:733
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 a7 6a 87 fb 4d 8b 24 24 49 83 c4 60 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 ab 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
vkms_vblank_simulate: vblank timer overrun
RSP: 0018:ffffc90000dd0bd8 EFLAGS: 00010206
RAX: 000000000000000c RBX: ffff8880606d8e10 RCX: dffffc0000000000
RDX: 0000000000000100 RSI: 0000000000000003 RDI: 0000000000000005
RBP: 1ffff1100c0db1c0 R08: ffffffff901ef157 R09: 1ffffffff203de2a
R10: dffffc0000000000 R11: fffffbfff203de2b R12: 0000000000000060
R13: ffff8880606d8e00 R14: ffff8881480200e0 R15: ffff888148020c00
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f997660afe8 CR3: 000000001e450000 CR4: 00000000003506e0
----------------
Code disassembly (best guess):
   0:	fc                   	cld
   1:	ff                   	lcall  (bad)
   2:	df 80 3c 08 00 74    	filds  0x7400083c(%rax)
   8:	08 4c 89 e7          	or     %cl,-0x19(%rcx,%rcx,4)
   c:	e8 a7 6a 87 fb       	call   0xfb876ab8
  11:	4d 8b 24 24          	mov    (%r12),%r12
  15:	49 83 c4 60          	add    $0x60,%r12
  19:	4c 89 e0             	mov    %r12,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 ab 05 00 00    	jne    0x5e1
  36:	45 8b 24 24          	mov    (%r12),%r12d
  3a:	44 89 e6             	mov    %r12d,%esi
  3d:	83 e6 02             	and    $0x2,%esi