Monodevelop

が，以下のエラーを吐いて落ちる原因．

=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================

Stacktrace:

in (wrapper managed-to-native) Gecko.WebControl:gtk_moz_embed_render_data (intptr,intptr,uint,intptr,intptr) <0x4>
in (wrapper managed-to-native) Gecko.WebControl:gtk_moz_embed_render_data (intptr,intptr,uint,intptr,intptr) <0xffffffcb>
in Gecko.WebControl:RenderData (string,string,string) <0x6b>
in MonoDevelop.Components.HtmlControl.MozillaControl:InitializeWithBase (string) <0x25>

なんとなくstraceのログを見ていたら，ひらめいた．

$ rm -rf .config/Monodevelop

で，解決．