input: syz1 as /devices/virtual/input/input137
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
kobject: 'loop1' (000000001daa6e9f): kobject_uevent_env
CPU: 0 PID: 9804 Comm: syz-executor5 Not tainted 4.19.0-rc5-next-20180924+ #78
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:dev_net include/linux/netdevice.h:2164 [inline]
RIP: 0010:__skb_flow_dissect+0x3b5/0x5980 net/core/flow_dissector.c:758
Code: 48 c1 ea 03 80 3c 02 00 0f 85 a6 4d 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 77 10 49 8d be 80 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 5c 4d 00 00 4d 8b b6 80 05 00 00 48 b8 00 00 00
kobject: 'loop1' (000000001daa6e9f): fill_kobj_path: path = '/devices/virtual/block/loop1'
RSP: 0018:ffff8801bfc66f00 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801bfc672d0 RCX: ffffc9000304f000
RDX: 00000000000000b0 RSI: ffffffff8612a7d8 RDI: 0000000000000580
RBP: ffff8801bfc67660 R08: ffff8801808be440 R09: ffffed003b585b57
R10: ffffed003b585b57 R11: ffff8801dac2dabb R12: ffffffff8a521ce4
R13: ffffffff8a521ce6 R14: 0000000000000000 R15: ffff8801c70f9e00
FS:  00007f3d38682700(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe90bb67db8 CR3: 00000001c295a000 CR4: 00000000001406f0
DR0: 000000000000b8c4 DR1: 0000000000000000 DR2: 0000000000000000
------------[ cut here ]------------
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
downgrading a read lock
Call Trace:
WARNING: CPU: 1 PID: 9812 at kernel/locking/lockdep.c:3623 __lock_downgrade kernel/locking/lockdep.c:3623 [inline]
WARNING: CPU: 1 PID: 9812 at kernel/locking/lockdep.c:3623 lock_downgrade+0x4d7/0x900 kernel/locking/lockdep.c:3875
Kernel panic - not syncing: panic_on_warn set ...

 skb_flow_dissect_flow_keys_basic include/linux/skbuff.h:1245 [inline]
 skb_get_poff+0x9b/0x1c0 net/core/flow_dissector.c:1486
 ____bpf_skb_get_pay_offset net/core/filter.c:126 [inline]
 bpf_skb_get_pay_offset+0x15/0x20 net/core/filter.c:124
Modules linked in:
Kernel Offset: disabled
Rebooting in 86400 seconds..