I also occasionally experience this issue when opening the "new mail" window in KMail. My attempt to get a readable backtrace resulted in this (I used addr2line on a debug binary, not the one which actually crashed - but it looks right):
3: FindGlyphByHash /build/buildd/xorg-server-1.6.4/obj-i486-linux-gnu/render/../../render/glyph.c:263 4: ProcRenderAddGlyphs /build/buildd/xorg-server-1.6.4/obj-i486-linux-gnu/render/../../render/render.c:1131 5: ProcRenderDispatch /build/buildd/xorg-server-1.6.4/obj-i486-linux-gnu/render/../../render/render.c:2092 6: Dispatch /build/buildd/xorg-server-1.6.4/obj-i486-linux-gnu/dix/../../dix/dispatch.c:457 7: main /build/buildd/xorg-server-1.6.4/obj-i486-linux-gnu/dix/../../dix/main.c:399
This is with Kubuntu 9.10, X.Org X Server 1.6.4, NVidia binary drivers 185.18.36, KDE 4.3.5, KMail 1.12.4.
I also occasionally experience this issue when opening the "new mail" window in KMail. My attempt to get a readable backtrace resulted in this (I used addr2line on a debug binary, not the one which actually crashed - but it looks right):
3: FindGlyphByHash buildd/ xorg-server- 1.6.4/obj- i486-linux- gnu/render/ ../../render/ glyph.c: 263 buildd/ xorg-server- 1.6.4/obj- i486-linux- gnu/render/ ../../render/ render. c:1131 buildd/ xorg-server- 1.6.4/obj- i486-linux- gnu/render/ ../../render/ render. c:2092 buildd/ xorg-server- 1.6.4/obj- i486-linux- gnu/dix/ ../../dix/ dispatch. c:457 buildd/ xorg-server- 1.6.4/obj- i486-linux- gnu/dix/ ../../dix/ main.c: 399
/build/
4: ProcRenderAddGlyphs
/build/
5: ProcRenderDispatch
/build/
6: Dispatch
/build/
7: main
/build/
This is with Kubuntu 9.10, X.Org X Server 1.6.4, NVidia binary drivers 185.18.36, KDE 4.3.5, KMail 1.12.4.