Comment # 25 on bug 1047852 from Yasuhiko Kamata

(In reply to David Rankin from comment #23)
> Created attachment 823676 [details]
> knotify.kcrash after snd-pcm-oss module loaded
> 
> Has no effect. Still crashes in the same manner, e.g.
> 
> $ cat /etc/modules-load.d/snd-pcm-oss.conf
> snd-pcm-oss
> 
> (having rebooted and restarted)
> 
> associated libjack kcrash attached.

Using OSS is not a solution, but a workaround.
This means that you can use OSS instead of Jack in KDE3
(KDE3 control center -> Sound & Multimedia -> Sound System -> "Hardware" tab ->
Audio Device).