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SubjectWARNING in snd_usbmidi_submit_urb/usb_submit_urb
From
Hello,

syzbot found the following crash on:

HEAD commit: bdc48fa1 checkpatch/coding-style: deprecate 80-column warn..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15d64586100000
kernel config: https://syzkaller.appspot.com/x/.config?x=129ea1e5950835e5
dashboard link: https://syzkaller.appspot.com/bug?extid=5f1d24c49c1d2c427497
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12d70cf2100000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+5f1d24c49c1d2c427497@syzkaller.appspotmail.com

RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00000000000007dc R14: 00000000004cab2a R15: 00007f5ab0e216d4
------------[ cut here ]------------
URB 00000000d6b1ff88 submitted while active
WARNING: CPU: 1 PID: 8661 at drivers/usb/core/urb.c:363 usb_submit_urb+0x10c1/0x13b0 drivers/usb/core/urb.c:363
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 8661 Comm: syz-executor.0 Not tainted 5.7.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x188/0x20d lib/dump_stack.c:118
panic+0x2e3/0x75c kernel/panic.c:221
__warn.cold+0x2f/0x35 kernel/panic.c:582
report_bug+0x27b/0x2f0 lib/bug.c:195
fixup_bug arch/x86/kernel/traps.c:175 [inline]
fixup_bug arch/x86/kernel/traps.c:170 [inline]
do_error_trap+0x12b/0x220 arch/x86/kernel/traps.c:267
do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286
invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:usb_submit_urb+0x10c1/0x13b0 drivers/usb/core/urb.c:363
Code: 89 de e8 32 54 6a fc 84 db 0f 85 42 f6 ff ff e8 f5 52 6a fc 4c 89 fe 48 c7 c7 60 46 ab 88 c6 05 22 f3 7b 05 01 e8 b7 82 3b fc <0f> 0b e9 20 f6 ff ff c7 44 24 14 01 00 00 00 e9 d7 f6 ff ff 41 bd
RSP: 0018:ffffc9000a37f2c8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815cf161 RDI: fffff5200146fe4b
RBP: dffffc0000000000 R08: ffff88808f2242c0 R09: ffffed1015ce66a9
R10: ffff8880ae733547 R11: ffffed1015ce66a8 R12: 0000000000000cc0
R13: 00000000fffffff0 R14: ffff8880a37b6400 R15: ffff8880894c1600
snd_usbmidi_submit_urb+0x19/0x60 sound/usb/midi.c:194
snd_usbmidi_input_start_ep sound/usb/midi.c:2313 [inline]
snd_usbmidi_input_start.part.0+0xbe/0x1c0 sound/usb/midi.c:2329
snd_usbmidi_input_start sound/usb/midi.c:1119 [inline]
substream_open.isra.0+0x505/0x830 sound/usb/midi.c:1119
open_substream+0x42e/0x880 sound/core/rawmidi.c:299
rawmidi_open_priv+0x2e8/0x6e0 sound/core/rawmidi.c:342
snd_rawmidi_kernel_open+0x1b5/0x270 sound/core/rawmidi.c:382
midisynth_subscribe+0xf2/0x330 sound/core/seq/seq_midi.c:170
subscribe_port sound/core/seq/seq_ports.c:412 [inline]
check_and_subscribe_port+0x5b5/0x800 sound/core/seq/seq_ports.c:495
snd_seq_port_connect+0x2e4/0x510 sound/core/seq/seq_ports.c:564
snd_seq_ioctl_subscribe_port+0x1df/0x310 sound/core/seq/seq_clientmgr.c:1484
snd_seq_kernel_client_ctl+0xeb/0x130 sound/core/seq/seq_clientmgr.c:2353
snd_seq_oss_midi_open+0x3cb/0x640 sound/core/seq/oss/seq_oss_midi.c:364
snd_seq_oss_synth_setup_midi+0x123/0x520 sound/core/seq/oss/seq_oss_synth.c:269
snd_seq_oss_open+0x7fa/0x980 sound/core/seq/oss/seq_oss_init.c:261
odev_open+0x6c/0x90 sound/core/seq/oss/seq_oss.c:125
soundcore_open+0x446/0x600 sound/sound_core.c:593
chrdev_open+0x219/0x5c0 fs/char_dev.c:414
do_dentry_open+0x4ba/0x1290 fs/open.c:797
do_open fs/namei.c:3229 [inline]
path_openat+0x1e59/0x27d0 fs/namei.c:3346
do_filp_open+0x192/0x260 fs/namei.c:3373
do_sys_openat2+0x585/0x7d0 fs/open.c:1148


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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