Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]
CPU: 2 UID: 0 PID: 6806 Comm: kworker/2:6 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: mld mld_ifc_work

RIP: 0010:dummy_queue+0x1ba/0xb00 drivers/usb/gadget/udc/dummy_hcd.c:737
Code: 00 49 83 bc 24 c8 05 00 00 00 0f 84 a6 07 00 00 e8 2b 2a 39 fa 49 8d 7f 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 4f 07 00 00 45 8b 7f 60 31 ff
RSP: 0018:ffffc90004557330 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88803222fc10 RCX: ffffffff87d1359f
RDX: 000000000000000c RSI: ffffffff87d13615 RDI: 0000000000000060
RBP: ffff88802b5840e0 R08: 0000000000000005 R09: 0000000000000005
R10: 0000000000000003 R11: 000000000000758b R12: ffff88802b584c00
R13: ffff88803222fc00 R14: ffff88802b5840d8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880d5fdc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f09fcf734ac CR3: 00000000395e9000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 00000000fda3b69a DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 usb_ep_queue+0xfa/0x3c0 drivers/usb/gadget/udc/core.c:305
 eth_start_xmit+0x684/0x1390 drivers/usb/gadget/function/u_ether.c:579
 __netdev_start_xmit include/linux/netdevice.h:5400 [inline]
 netdev_start_xmit include/linux/netdevice.h:5409 [inline]
 xmit_one net/core/dev.c:3889 [inline]
 dev_hard_start_xmit+0x121/0x760 net/core/dev.c:3905
 sch_direct_xmit+0x1b2/0xc70 net/sched/sch_generic.c:372
 __dev_xmit_skb net/core/dev.c:4214 [inline]
 __dev_queue_xmit+0x27ac/0x4970 net/core/dev.c:4836
 dev_queue_xmit include/linux/netdevice.h:3446 [inline]
 neigh_hh_output include/net/neighbour.h:544 [inline]
 neigh_output include/net/neighbour.h:558 [inline]
 ip6_finish_output2+0xfd4/0x1ce0 net/ipv6/ip6_output.c:136
 __ip6_finish_output+0x357/0xdf0 net/ipv6/ip6_output.c:208
 ip6_finish_output net/ipv6/ip6_output.c:219 [inline]
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip6_output+0x2aa/0xa60 net/ipv6/ip6_output.c:246
 dst_output include/net/dst.h:470 [inline]
 NF_HOOK include/linux/netfilter.h:318 [inline]
 NF_HOOK.constprop.0+0x115/0x5a0 include/linux/netfilter.h:312
 mld_sendpack+0x8f7/0xec0 net/ipv6/mcast.c:1869
 mld_send_cr net/ipv6/mcast.c:2170 [inline]
 mld_ifc_work+0x75a/0xc10 net/ipv6/mcast.c:2710
 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_queue+0x1ba/0xb00 drivers/usb/gadget/udc/dummy_hcd.c:737
Code: 00 49 83 bc 24 c8 05 00 00 00 0f 84 a6 07 00 00 e8 2b 2a 39 fa 49 8d 7f 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 4f 07 00 00 45 8b 7f 60 31 ff
RSP: 0018:ffffc90004557330 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88803222fc10 RCX: ffffffff87d1359f
RDX: 000000000000000c RSI: ffffffff87d13615 RDI: 0000000000000060
RBP: ffff88802b5840e0 R08: 0000000000000005 R09: 0000000000000005
R10: 0000000000000003 R11: 000000000000758b R12: ffff88802b584c00
R13: ffff88803222fc00 R14: ffff88802b5840d8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880d5fdc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f09fcf734ac CR3: 00000000395e9000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 00000000fda3b69a DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 49 83             	add    %cl,-0x7d(%rcx)
   3:	bc 24 c8 05 00       	mov    $0x5c824,%esp
   8:	00 00                	add    %al,(%rax)
   a:	0f 84 a6 07 00 00    	je     0x7b6
  10:	e8 2b 2a 39 fa       	call   0xfa392a40
  15:	49 8d 7f 60          	lea    0x60(%r15),%rdi
  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:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 08                	je     0x3a
  32:	3c 03                	cmp    $0x3,%al
  34:	0f 8e 4f 07 00 00    	jle    0x789
  3a:	45 8b 7f 60          	mov    0x60(%r15),%r15d
  3e:	31 ff                	xor    %edi,%edi