Re: [jazzplusplus-devel] configure.ac update -please test-

[D.B. M. <db...@ho...>]

> Date: Mon, 12 May 2008 09:40:48 -0700
> Subject: Re: [jazzplusplus-devel] configure.ac update -please test-
>
>
> On 10 May 2008 at 12:31, Pete Stieber wrote:
>
>> Donald and Kevin, could I get you to try the Linux build and make sure
>> the jack/flsynth/qsynth is working.  I don't have access to a Linux
>> setup at the moment and that would really help me out.

..for some reason I didn't receive this original posting - thankfully Kevin
responded to it and I was able to pick up the thread....

>
>
>> BTW I always seem to have a heck of a time with Mandriva.  Jazz++ can
>> hang it, it doesn't want to recognize my keyboard...

Curious...I hadn't noticed that here myself with my initial builds, however
subsequent to this call for testing....yes..there's something strange going on
with input devices on linux. Here's the detail....

My svn source version here is current at rev. 518

Distcleaned my local svn, rebuilt the source and installed (completes successfully)
The build-log is attached just in case there's something to see in it.

Started up jack/fluidsynth/qsynth as previously configured and tested okay.

Launching jazz almost immediately caused a segfault....

jazz[3277]: segfault at 1 ip 424c82 sp 7fffe79bf840 error 4 in jazz[400000+573000]
jazz[3287]: segfault at 1 ip 424c82 sp 7fff0dd7b040 error 4 in jazz[400000+573000]
jazz[3288]: segfault at 1 ip 424c82 sp 7fff0af091d0 error 4 in jazz[400000+573000]
jazz[3299]: segfault at 1 ip 424c82 sp 7fff5cf1c1f0 error 4 in jazz[400000+573000]
jazz[3300]: segfault at 1 ip 424c82 sp 7fff12a95d60 error 4 in jazz[400000+573000]
jazz[3301]: segfault at 1 ip 424c82 sp 7fff8092bbf0 error 4 in jazz[400000+573000]

This is me (re)starting jazz half-a-dozen times looking for clues. On the 7th attempt ;

jazz[3310]: segfault at 1 ip 426cea sp 7fff8e2aa1e0 error 4 in jazz[400000+5ad000]


That last one 'stole' both my mouse&keyboard completely, and left me with no X input.
The system was still running though, so I moved to one of my other boxes, and
ssh'd into this system to see if there were any clues...unfortunately and AFAICT there
were no clues or errors to seen...in fact, everything looked fine...just X had lost input.


One of the last things I saw in console that launched jazz leading up to this was ;

"Invalid input device"


I believe I might have recovered the situation with an simple X restart, however I
decided to reboot the system to be sure of a 'clean slate'.

Taking Pete's obtrusion about mouse&keyboard weirdness into account, and on
a hunch thinking 'invalid input device' might be somehow related, I decided on a
different approach...

I downloaded Takashi Iwai's 'vkeybd' source, compiled & installed. I then started
this virtual midi keyboard and check it registered in alsa midi devices -- it does,
along with jack/fluidsynth/qsynth.

I then restarted jazz to discover things were actually sane again. It prompted me
for input device (I of course chose the vkeybd client), and output device (selected
qsynth)....hey presto, it's all working again as currently expected..well...caveat ;

subscribe: Operation not permitted

I see this in dmesg when jazz finishes configuration dialogs and starts.

Occasionally;

jazz[3458]: segfault at 0 ip 7f606dd1dd39 sp 7fff77552410 error 4 in libasound.so.2.0.0[7f606dc87000+d2000]

is seen in dmesg -- I'm still trying to accurately recreate this one to find the cause,
but it's being elusive...


I hope this helps some -- anything else/specific you want to know?


>Kevin C wote;
>
> Hmmm.  I wonder what would happen with a Linus kernel on Mandriva?
>

Just for the record, this account of proceedings here was using linux 2.6.25.3

I think my next move here is to double-check my alsalib installation - it's
been a while since I checked what's current.

Regards,

Donald B


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