Red Hat Bugzilla – Bug 197474
List corruption in ALSA sequencer API, kernel hangs/crashes
Last modified: 2015-01-04 17:27:44 EST
Description of problem:
Any application using the ALSA sequencer API will cause the kernel to crash when
it terminates. With kernel 2.6.16-1.2133_FC5, the system will completely lock
up. With kernel 2.6.17-1.2139_FC5, it will dump a stack trace and recover,
however the ALSA sequencer driver will be locked up. Anything trying to use it
will hang when trying to open() /dev/snd/seq.
Kernel 2.6.16-1.2122_FC5 and earlier work fine.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Start an application that uses the ALSA sequencer API. (qjackctl, hydrogen...)
2. Quit the application.
3. Check your syslog / Watch your system lock up
I posted a thread to fedora-music-list following my attempts to track this down:
I ran into a problem with apps segfaulting when the jack period size is too
small, I believe this to be an unrelated bug that just happens to trigger THIS
bug as well due the app terminating.
I have attached a log. A few more are available in that thread.
Created attachment 131856 [details]
A stack trace
Okay, I've tried this on PPC. On my iMac, on both 2.6.16-1.2133_FC5 and
2.6.17-1.2139_FC5 I get a total system lockup. No stack trace.
I have not yet run 2.6.16-1.2122_FC5 on it.
This should be fixed in the latest update.
Yup, seems to work now!