Bug 51201
| Summary: | Kernel crashes at snd_usbmidi_output_close() when device is removed | ||
|---|---|---|---|
| Product: | Drivers | Reporter: | Mauro Carvalho Chehab (mchehab) |
| Component: | Sound(ALSA) | Assignee: | Jaroslav Kysela (perex) |
| Status: | RESOLVED CODE_FIX | ||
| Severity: | normal | CC: | florian, tiwai |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 3.6.7-4.fc17.x86_64 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
| Attachments: |
Kernel OOPS message
lsusb for DigiTech RP255 Guitar Multi-Effects Processor patch1 patch2 |
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Created attachment 88051 [details]
lsusb for DigiTech RP255 Guitar Multi-Effects Processor
The patches below should fix the issue. Please try them out.
These were merged in sound git tree for-next branch, too.
git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git
Created attachment 88381 [details]
patch1
Created attachment 88391 [details]
patch2
A patch referencing this bug report has been merged in Linux v3.8-rc1: commit 59866da9e4ae54819e3c4e0a8f426bdb0c2ef993 Author: Takashi Iwai <tiwai@suse.de> Date: Mon Dec 3 11:12:46 2012 +0100 ALSA: usb-audio: Avoid autopm calls after disconnection |
Created attachment 88041 [details] Kernel OOPS message There's something wrong at snd_usbmidi_output_close(). When using gdigi with a Digitech RP-255 pedal, sometimes I disconnect the pedal before closing gdigi. When gdigi is later closed, Kernel panics at snd_usbmidi_output_close(). I suspect that there are some missing tests there, to see if the device's data are still there. The end result is a Kernel panic: BUG: unable to handle kernel NULL pointer dereference at 0000000000000190 IP: [<ffffffff8143fb54>] usb_autopm_put_interface+0x14/0x40 ... Call Trace: [<ffffffffa078f809>] snd_usbmidi_output_close+0x29/0x40 [snd_usbmidi_lib] ... I'm attaching the full OOPS message, and the lsusb -v info of the device.