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Re: [64bit] emacs is unable to call subprocesses if display-time-mode is set


On 4/3/2013 10:05 AM, Corinna Vinschen wrote:
On Apr  3 09:49, Ken Brown wrote:
On 4/3/2013 7:41 AM, Corinna Vinschen wrote:
On Apr  2 18:57, Ken Brown wrote:
How did you figure out that the crash occurs in cmalloc?  I tried
addr2line, but it gave me no information:

$ addr2line -e /bin/cygwin1.dll 1800429F4
??:?

Are you sure the stackdump is from the same version of the Cygwin
DLL you're running now?

I didn't get a stackdump.  I was relying on the following line from
the strace output:

   Process 4928, exception c0000005 at 00000001800429F4

I just reproduced that today, with the same address, so there's no
question of the DLL version.

Hmm.  Did you install the cygwin-debuginfo package?  If all else
fails, try `addr2line -e /usr/lib/debug/usr/bin/cygwin1.dbg'.  I get

   $ $ addr2line -e /usr/lib/debug/usr/bin/cygwin1.dbg 1800429F4
   /usr/src/debug/cygwin-1.7.18-15/winsup/cygwin/cygheap.cc:298

Ah, that works. I thought addr2line was supposed to know where to find cygwin1.dbg.

I can reproduce the issue but it's tricky to debug.  The exception
occurs in the forked process and GDB can't follow fork on Cygwin.

Btw., can you create an emacs which is built without optimization
and non-stripped this would simplify debuigging a bit...

It was already built without optimization. I'm working on building a non-stripped version, but cygport isn't cooperating. If you put "RESTRICT=strip" into the .cygport file, then cygport doesn't package the sources. So you get a binary with debugging symbols, but you don't get the corresponding sources.

I'll send Yaakov a patch, but in the meantime I'm working around this. It shouldn't be long.

Ken


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