Re: Build hangs in lisp/gnus.

[Eli Zaretskii]

> Date: Sat, 4 Apr 2015 16:42:15 +0000
> Cc: address@hidden
> From: Alan Mackenzie <address@hidden>
> 
> > Type "finish" repeatedly s long as it displays the call-stack frames,
> > then tell here which frame was the last you saw, before it stopped
> > showing frames.
> 
> I typed "finish" just once, and the looping build process resumed with
> the message:
> 
> Run till exit from #4  0x00000000005f5e5d in Ffuncall (nargs=3, 
> args=0x7fff0f1dc3a8) at eval.c:2721
> 
> .  Does that give any useful information?

Yes, it now becomes important to understand what was that frame
doing.  Can you reproduce the same hang and backtrace at will?  If so,
after you attach GDB, and assuming the frame that calls Ffuncall is
again frame #4, type these commands:

 (gdb) frame 4
 (gdb) p args[0]
 (gdb) xtype
 (gdb) p args[1]
 (gdb) xtype
 (gdb) p args[2]
 (gdb) xtype

For each Lisp type that "xtype" reports, there's a corresponding
command to display the Lisp object in human-readable form: "xsymbol"
for a symbol, "xstring" for a string, "xvectorr" for a vector, etc.
So after each "xtype" command invoke the corresponding command to
display the object, and let's take it from there.