Most clients affected were VIA EDEN boxes. The terminal seemed ok but needed a reboot to get the ICA client working.
After much fiddling, I got the person that was worst affected and installed a hard disk with Fedora Core 2 that started much like the LTSP clients.
Magically the problem went away.
After a bit of thought I tried copying the ICA client to a local ram disk on the LTSP clients in case it was network connectivity that was causing the problems. That helped a bit but didn't stop all of the lockups.
After considering the differences between the local Fedora Core 2 and the LTS client I hit on the kernel (2.6) on Core 2, and more particular the ALSA drivers. The VIA EDEN boxes regularly have an assertion from the sound driver in the kernel log (dmesg).
The worst affected user let slip that mostly he was doing a similar thing, backspacing over fields in a form. I though, if he was going too far perhaps the application was trying to make an error beep or something. The user did not have speakers on his terminal, even though the terminals were set up for it.
I installed strace on the LTSP clients and waited for a call that my test user had locked up.
A little later, the phone call came and strace showed when tracing the ICA client:
ioctl(5,SNDCTL_DSP_SYNC,
Then nothing, it was stuck in the kernel.
I disabled the ICA sound and 100 people are happy.
Now to build a kernel with ALSA instead of OSS drivers in it.
How about it Jim?
Regards Darryl Bond
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