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SubjectWARNING in devlink_port_type_warn

syzbot found the following crash on:

HEAD commit: c68c5373 Add linux-next specific files for 20191107
git tree: linux-next
console output:
kernel config:
dashboard link:
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:

hid-generic 0000:0000:0000.0009: unknown main item tag 0x0
hid-generic 0000:0000:0000.0009: unknown main item tag 0x0
hid-generic 0000:0000:0000.0009: hidraw0: <UNKNOWN> HID v0.00 Device [syz1]
on syz1
------------[ cut here ]------------
Type was not set for devlink port.
WARNING: CPU: 1 PID: 50 at net/core/devlink.c:6342
devlink_port_type_warn+0x15/0x20 net/core/devlink.c:6342
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 50 Comm: kworker/1:1 Not tainted 5.4.0-rc6-next-20191107 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: events devlink_port_type_warn
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x197/0x210 lib/dump_stack.c:118
panic+0x2e3/0x75c kernel/panic.c:221
__warn.cold+0x2f/0x35 kernel/panic.c:582
report_bug+0x289/0x300 lib/bug.c:195
fixup_bug arch/x86/kernel/traps.c:174 [inline]
fixup_bug arch/x86/kernel/traps.c:169 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267
do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286
invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:devlink_port_type_warn+0x15/0x20 net/core/devlink.c:6342
Code: 89 df e8 de 44 ec fb e9 d3 fe ff ff 66 0f 1f 84 00 00 00 00 00 55 48
89 e5 e8 f7 19 b0 fb 48 c7 c7 e0 ef 4a 88 e8 63 2b 81 fb <0f> 0b 5d c3 0f
1f 80 00 00 00 00 55 48 89 e5 41 55 49 89 f5 41 54
RSP: 0018:ffff8880a9b07d30 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815d0b86 RDI: ffffed1015360f98
RBP: ffff8880a9b07d30 R08: ffff8880a9b365c0 R09: fffffbfff14f374c
R10: fffffbfff14f374b R11: ffffffff8a79ba5f R12: ffff888076daecc0
R13: 0000000000000080 R14: ffff8880a99aa900 R15: ffff8880ae934540
process_one_work+0x9af/0x1740 kernel/workqueue.c:2263
worker_thread+0x98/0xe40 kernel/workqueue.c:2409
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..

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