kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 12756 Comm: syz-executor3 Not tainted 4.20.0-rc6+ #350
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:182 [inline]
RIP: 0010:inet6_lhash2_lookup+0xc4/0x640 net/ipv6/inet6_hashtables.c:132
Code: f2 f2 f2 f2 c7 40 0c 00 f2 f2 f2 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 97 52 84 fa 48 8d 7b 40 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 59 05 00 00 4c 8d a5 58 ff ff ff 48 8b 5b 40
RSP: 0018:ffff8881daf07010 EFLAGS: 00010202
RAX: 0000000000000008 RBX: 0000000000000000 RCX: 0000000000000014
kobject: 'loop4' (00000000d176c5a4): kobject_uevent_env
RDX: 0000000000000100 RSI: ffffffff86fb31f9 RDI: 0000000000000040
RBP: ffff8881daf07128 R08: ffff8881985a76bc R09: 00000000000048bf
R10: ffffed103a308990 R11: ffff8881d1844c83 R12: dffffc0000000000
R13: 0000000000004e20 R14: ffff8881985a76cc R15: ffffffff8bc672ec
FS:  00007fdf1d5a0700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'loop4' (00000000d176c5a4): fill_kobj_path: path = '/devices/virtual/block/loop4'
CR2: 00007fff267198d9 CR3: 00000001b7a25000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 inet6_lookup_listener+0x17d/0x790 net/ipv6/inet6_hashtables.c:167
 __inet6_lookup include/net/inet6_hashtables.h:81 [inline]
 __inet6_lookup_skb include/net/inet6_hashtables.h:98 [inline]
 dccp_v6_rcv+0x12b5/0x1ce9 net/dccp/ipv6.c:715
 ip6_protocol_deliver_rcu+0x381/0x1950 net/ipv6/ip6_input.c:394
 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:434
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ip6_input+0xe9/0x600 net/ipv6/ip6_input.c:443
kobject: 'loop5' (000000009dc9ba04): kobject_uevent_env
 dst_input include/net/dst.h:450 [inline]
 ip6_rcv_finish+0x17a/0x330 net/ipv6/ip6_input.c:76
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ipv6_rcv+0x115/0x640 net/ipv6/ip6_input.c:272
kobject: 'loop5' (000000009dc9ba04): fill_kobj_path: path = '/devices/virtual/block/loop5'
 __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4973
kobject: 'loop4' (00000000d176c5a4): kobject_uevent_env
 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5083
------------[ cut here ]------------
 process_backlog+0x24e/0x7a0 net/core/dev.c:5923
downgrading a read lock
WARNING: CPU: 0 PID: 12752 at kernel/locking/lockdep.c:3556 __lock_downgrade kernel/locking/lockdep.c:3556 [inline]
WARNING: CPU: 0 PID: 12752 at kernel/locking/lockdep.c:3556 lock_downgrade+0x4d7/0x900 kernel/locking/lockdep.c:3819
 napi_poll net/core/dev.c:6346 [inline]
 net_rx_action+0x7fa/0x19b0 net/core/dev.c:6412