Re: Segfault when a gnuplot graph is closed?

[Arnaud Desitter]

Hi,

>From your stack trace, something may get wrong in SeparatoG.c:695
which is part of LessTif.
Looking at:
http://cvs.sourceforge.net/viewcvs.py/lesstif/lesstif/lib/Xm/SeparatoG.c
it is the exact line involving a series of bug fixes.
Before going any further, either upgrade LessTif from their CVS
repository or downgrade it to a version before 0.93.91 and rebuild
ddd. An easier way is to rebuild against openMotif and see if it fixes
it (use valgrind to make sure).

Good luck,

----- Original Message ----- 
From: "Atwood, Robert C" <address@hidden>
Newsgroups: gmane.comp.debugging.ddd.general
Cc: <address@hidden>
Sent: Tuesday, November 25, 2003 2:57 PM
Subject: RE: Segfault when a gnuplot graph is closed?


> Dear Arnaud:
>
> Here are some back traces. Another interesting phenomenon is that when
> running in Valgrind, the segfault seems to ALWAYS occur, even if I click
the
> 'continue' button only once,  whereas if I run within gdb or just normal
> ddd, I have to try a few times before it happens, usually pushing the
> 'continue' button a number of times before trying the 'close' button on
the
> graph menu.
> "Heisenbug" indeed!
>
> Thanks ,
>
> --Robert
>
> (version of the rpm-installed libX11.so)
>
> [rcatwood hello]$ rpm -q -f /usr/X11R6/lib/libX11.so
> XFree86-devel-4.1.0-25
> [rcatwood hello]$ rpm -q -f /usr/X11R6/lib/libX11.so.6.2
> XFree86-libs-4.1.0-25
> [rcatwood hello]$ rpm -q XFree86
> XFree86-4.1.0-25
>
> >From gdb:
>
> (gdb) run hello
> Starting program: /usr/local/encap/ddd-3.3.8/bin/ddd hello
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x402f1319 in XGetGCValues () from /usr/X11R6/lib/libX11.so.6
> Current language:  auto; currently c
> (gdb) bt
> #0  0x402f1319 in XGetGCValues () from /usr/X11R6/lib/libX11.so.6
> #1  0x400d02f7 in set_values (old=0xbfffe8e0, request=0xbfffe5c0,
> new_w=0x87e48b0, args=0xbfffec40, num_args=0xbfffe3c4)
>     at SeparatoG.c:695
> #2  0x40270299 in XtSetSensitive () from /usr/X11R6/lib/libXt.so.6
> #3  0x402707a3 in XtSetValues () from /usr/X11R6/lib/libXt.so.6
> #4  0x40270018 in XtGetSelectionParameters () from
/usr/X11R6/lib/libXt.so.6
> #5  0x40270054 in XtGetSelectionParameters () from
/usr/X11R6/lib/libXt.so.6
> #6  0x40270144 in XtSetSensitive () from /usr/X11R6/lib/libXt.so.6
> #7  0x0816ba0b in popdown_plot_shell (plot=0x8807138) at plotter.C:644
> #8  0x0816ba7f in CancelPlotCB (client_data=0x0) at plotter.C:680
> #9  0x40250736 in XtCallCallbackList () from /usr/X11R6/lib/libXt.so.6
> #10 0x400ac3c6 in ButtonUp (w=0x8819d20, event=0xbffff060, params=0x0,
> num_params=0x4028ea14) at PushB.c:1372
> #11 0x4027f6c1 in _XtMatchAtom () from /usr/X11R6/lib/libXt.so.6
> #12 0x4027fb7c in _XtMatchAtom () from /usr/X11R6/lib/libXt.so.6
> #13 0x402800f7 in _XtTranslateEvent () from /usr/X11R6/lib/libXt.so.6
> #14 0x4025bdf8 in XtDispatchEventToWidget () from
/usr/X11R6/lib/libXt.so.6
> #15 0x4025c874 in _XtOnGrabList () from /usr/X11R6/lib/libXt.so.6
> #16 0x4025cac7 in XtDispatchEvent () from /usr/X11R6/lib/libXt.so.6
> #17 0x080567a1 in process_next_event() () at ddd.C:3202
> #18 0x0814c105 in ddd_main_loop() () at mainloop.C:106
> #19 0x080566ec in main (argc=137763976, argv=0x8361c88) at ddd.C:3130
> #20 0x405121f6 in __libc_start_main (main=0x80566c0 <main>, argc=2,
> ubp_av=0xbffff1f4, init=0x804f5b0 <_init>,
>     fini=0x8282eb0 <_fini>, rtld_fini=0x4000cfe8 <_dl_fini>,
> stack_end=0xbffff1ec) at ../sysdeps/generic/libc-start.c:129
> (gdb)
>
>
> >From Valgrind:
>
> ==5011==    by 0x80567A0: process_next_event() (ddd.C:3202)
> ==5011==    by 0x814C104: ddd_main_loop() (mainloop.C:106)
> ==5011==    by 0x80566EB: main (ddd.C:3130)
> ==5011==    by 0x4073F1F5: __libc_start_main
> (../sysdeps/generic/libc-start.c:129)
> ==5011==    by 0x80515A0: (within /usr/local/encap/ddd-3.3.8/bin/ddd)
> ==5011==
> ==5011== Use of uninitialised value of size 4
> ==5011==    at 0x4051E319: XGetGCValues (in /usr/X11R6/lib/libX11.so.6.2)
> ==5011==    by 0x402FD2F6: set_values (SeparatoG.c:695)
> ==5011==    by 0x4049E298: (within /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x4049E7A2: XtSetValues (in /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x4049E017: (within /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x4049E053: (within /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x4049E143: XtSetSensitive (in /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x816BA0A: popdown_plot_shell(PlotWindowInfo*)
> (plotter.C:644)
> ==5011==    by 0x816BA7E: CancelPlotCB(_WidgetRec*, void*, void*)
> (plotter.C:680)
> ==5011==    by 0x4047E735: XtCallCallbackList (in
> /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x402D93C5: ButtonUp (PushB.c:1372)
> ==5011==    by 0x404AD6C0: (within /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x404ADB7B: (within /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x404AE0F6: _XtTranslateEvent (in
> /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x40489DF7: XtDispatchEventToWidget (in
> /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x4048A873: (within /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x4048AAC6: XtDispatchEvent (in
/usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x80567A0: process_next_event() (ddd.C:3202)
> ==5011==    by 0x814C104: ddd_main_loop() (mainloop.C:106)
> ==5011==    by 0x80566EB: main (ddd.C:3130)
> ==5011==    by 0x4073F1F5: __libc_start_main
> (../sysdeps/generic/libc-start.c:129)
> ==5011==    by 0x80515A0: (within /usr/local/encap/ddd-3.3.8/bin/ddd)
> ==5011==
> ==5011== Invalid read of size 4
> ==5011==    at 0x4051E319: XGetGCValues (in /usr/X11R6/lib/libX11.so.6.2)
> ==5011==    by 0x402FD2F6: set_values (SeparatoG.c:695)
> ==5011==    by 0x4049E298: (within /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x4049E7A2: XtSetValues (in /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x4049E017: (within /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x4049E053: (within /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x4049E143: XtSetSensitive (in /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x816BA0A: popdown_plot_shell(PlotWindowInfo*)
> (plotter.C:644)
> ==5011==    by 0x816BA7E: CancelPlotCB(_WidgetRec*, void*, void*)
> (plotter.C:680)
> ==5011==    by 0x4047E735: XtCallCallbackList (in
> /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x402D93C5: ButtonUp (PushB.c:1372)
> ==5011==    by 0x404AD6C0: (within /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x404ADB7B: (within /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x404AE0F6: _XtTranslateEvent (in
> /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x40489DF7: XtDispatchEventToWidget (in
> /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x4048A873: (within /usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x4048AAC6: XtDispatchEvent (in
/usr/X11R6/lib/libXt.so.6.0)
> ==5011==    by 0x80567A0: process_next_event() (ddd.C:3202)
> ==5011==    by 0x814C104: ddd_main_loop() (mainloop.C:106)
> ==5011==    by 0x80566EB: main (ddd.C:3130)
> ==5011==    by 0x4073F1F5: __libc_start_main
> (../sysdeps/generic/libc-start.c:129)
> ==5011==    by 0x80515A0: (within /usr/local/encap/ddd-3.3.8/bin/ddd)
> ==5011==    Address 0x1D is not stack'd, malloc'd or free'd
> Segmentation fault (core dumped)
> ==5011==
> ==5011== ERROR SUMMARY: 9696 errors from 77 contexts (suppressed: 14170
from
> 7)
> ==5011==
> ==5011== 1 errors in context 1 of 77: