Segmentation Fault

[DaveyBob]

I'm running Ubuntu 11.10, and have installed DiffMerge 3.3.1.1121-1_amd64. DiffMerge itself runs fine, but if I attempt to go into the options menu, the program exits immediately with "Segmentation fault" shown on the console window.

I've uninstalled it (with purge) and reinstalled, but I get the same result.

[jeffhostetler]

I'll have to upgrade/build a VM to test that combination.
In the mean time, can you post a stack trace / post-mortem?

j

[DaveyBob]

I didn't know how to generate a back trace for a seg fault before. Now I do (thanks, Google):

(gdb) handle SIG33 nostop noprint noignore pass
Signal Stop Print Pass to program Description
SIG33 No No Yes Real-time event 33
(gdb) run
Starting program: /usr/bin/diffmerge
[Thread debugging using libthread_db enabled]
[New Thread 0x7fffed843700 (LWP 17547)]
[New Thread 0x7fffed042700 (LWP 17548)]
[New Thread 0x7fffe2c01700 (LWP 17549)]

Program received signal SIGSEGV, Segmentation fault.
0x00000000004f2dcb in ?? ()
(gdb) bt
#0 0x00000000004f2dcb in ?? ()
#1 0x00000000004fed5d in ?? ()
#2 0x00000000004315ba in ?? ()
#3 0x0000000000440fd1 in ?? ()
#4 0x000000000042ca8a in ?? ()
#5 0x000000000049fa99 in ?? ()
#6 0x0000000000571e3d in ?? ()
#7 0x0000000000573a34 in ?? ()
#8 0x0000000000573b17 in ?? ()
#9 0x00000000005d6edb in ?? ()
#10 0x00007ffff6e3981c in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#11 0x00007ffff6e4b019 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#12 0x00007ffff6e54258 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#13 0x00007ffff6e5441f in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#14 0x00007ffff79ec6ce in gtk_widget_activate () from /usr/lib/libgtk-x11-2.0.so.0
#15 0x00007ffff78e594d in gtk_menu_shell_activate_item () from /usr/lib/libgtk-x11-2.0.so.0
#16 0x00007ffff78e5ce5 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#17 0x00007ffff78d1578 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#18 0x00007ffff6e3981c in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#19 0x00007ffff6e4ae1f in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#20 0x00007ffff6e53fa9 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#21 0x00007ffff6e5441f in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#22 0x00007ffff79ed4d1 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#23 0x00007ffff78cf763 in gtk_propagate_event () from /usr/lib/libgtk-x11-2.0.so.0
#24 0x00007ffff78cfa5b in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
#25 0x00007ffff75425cc in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#26 0x00007ffff6979bcd in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007ffff697a3a8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007ffff697a9f2 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007ffff78ceaf7 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#30 0x00000000006823c2 in ?? ()
#31 0x00000000005e9f04 in ?? ()
#32 0x0000000000497262 in ?? ()
#33 0x000000000054b8b8 in ?? ()
#34 0x00000000004958df in ?? ()
#35 0x00007ffff53cceff in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
#36 0x000000000041a169 in ?? ()
#37 0x00007fffffffe208 in ?? ()
#38 0x000000000000001c in ?? ()
#39 0x0000000000000001 in ?? ()
#40 0x00007fffffffe4e3 in ?? ()
#41 0x0000000000000000 in ?? ()
(gdb) kill
Kill the program being debugged? (y or n) y
(gdb)

[jeffhostetler]

Thanks for the stack trace. I'll do some digging and get back to you.

Thanks again,
j

[DaveyBob]

Correction: I am running Ubuntu 11.04. (I had been running 11.10 for a while, but hated it, and went back to 11.04 by doing a disk restore.)

[jeffhostetler]

OK thanks.

Last night I built a 11.10 VM and was able to reproduce it.
I tracked it down to a 32 bit value not being sign extended
when it was converted to a 64-bit value for a test with -1 in
the 64-bit port. (sigh, groan, argh)

I'm building a candidate build now which I hope to post shortly.

j

[DaveyBob]

Great, thanks!

[jeffhostetler]

I'm using the crash as an excuse to add a few other fixes and
do a regular 3.3.2 release on all platforms.

If you would like to beta test the binary, that would be great.
Here's a link to the Ubuntu builds:
http://people.sourcegear.com/~jeffh/DiffMerge/

We'll probably release it later this week or early next week
once QA has some time to take a look at it. (To be fair, I did
kinda skip it in on them unannounced.)

Please let me know if you have any problems with this version.
jeff

(Release notes are in Chapter 11 in the manual.)

[DaveyBob]

Works like a champ! Thanks!