For example, if I call WolframAlpha by
"WolframAlpha["xyz"]"
and save the whole notebook (with WolframAlpha's output data stored in the tables) and re-open this file, then Mathematica will reproduce the crash.
/Edit: Just recognized, that Mathematica produces an terminal prompt on terminating:
X Error of failed request: GLXBadContext
Major opcode of failed request: 154 (GLX)
Minor opcode of failed request: 6 (X_GLXIsDirect)
Serial number of failed request: 17036
Current serial number in output stream: 17035
X Error of failed request: BadAlloc (insufficient resources for operation)
Major opcode of failed request: 154 (GLX)
Minor opcode of failed request: 3 (X_GLXCreateContext)
Serial number of failed request: 17031
Current serial number in output stream: 17036
X Error of failed request: GLXBadContext
Major opcode of failed request: 154 (GLX)
Minor opcode of failed request: 5 (X_GLXMakeCurrent)
Serial number of failed request: 17037
Current serial number in output stream: 17037
Mathematica has received the signal: SIGSEGV and has exited.
If possible, please report this problem to support@wolfram.com
describing in as much detail as possible what you were doing
when the problem occurred.