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SubjectWARNING in submit_audio_out_urb/usb_submit_urb

syzbot found the following crash on:

HEAD commit: 768a0741 usb: dwc2: gadget: Remove assigned but never used..
git tree: usb-testing
console output:
kernel config:
dashboard link:
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro:

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

usb 1-1: send failed (error -32)
snd_usb_toneport 1-1:0.0: Line 6 TonePort GX now attached
------------[ cut here ]------------
usb 1-1: BOGUS urb xfer, pipe 0 != type 3
WARNING: CPU: 0 PID: 12 at drivers/usb/core/urb.c:478 usb_submit_urb+0xa17/0x13e0 drivers/usb/core/urb.c:478
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events line6_startup_work
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xf6/0x16e lib/dump_stack.c:118
panic+0x2aa/0x6e1 kernel/panic.c:231
__warn.cold+0x20/0x50 kernel/panic.c:600
report_bug+0x1bd/0x210 lib/bug.c:198
handle_bug+0x41/0x80 arch/x86/kernel/traps.c:235
exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255
asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:563
RIP: 0010:usb_submit_urb+0xa17/0x13e0 drivers/usb/core/urb.c:478
Code: 84 e7 04 00 00 e8 a9 10 ca fd 4c 89 ef e8 41 79 12 ff 41 89 d8 44 89 e1 4c 89 f2 48 89 c6 48 c7 c7 80 a0 5d 86 e8 db 77 9e fd <0f> 0b e8 82 10 ca fd 0f b6 6c 24 08 48 c7 c6 e0 a1 5d 86 48 89 ef
RSP: 0018:ffff8881da227b10 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffff8881da211900 RSI: ffffffff8129b4e3 RDI: ffffed103b444f54
RBP: 0000000000000030 R08: 0000000000000001 R09: ffff8881db21fe8b
R10: 0000000000000000 R11: 0000000000000004 R12: 0000000000000000
R13: ffff8881d6ecd0a0 R14: ffff8881d3d8c690 R15: ffff8881d54c4000
submit_audio_out_urb+0x6d6/0x1a00 sound/usb/line6/playback.c:271
line6_submit_audio_out_all_urbs+0xc9/0x120 sound/usb/line6/playback.c:291
line6_stream_start+0x187/0x230 sound/usb/line6/pcm.c:195
line6_pcm_acquire+0x137/0x210 sound/usb/line6/pcm.c:318
line6_startup_work+0x42/0x50 sound/usb/line6/driver.c:734
process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269
worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
kthread+0x392/0x470 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Kernel Offset: disabled
Rebooting in 86400 seconds..

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