Public bug reported:
Binary package hint: xterm
Package: xterm-229-1ubuntu1
Description: Ubuntu 8.04.1
Release: 8.04
When started from a panel launcher, xterm segfaults shortly after
startup at least 50% of the time. When run from the command line, it
always seems to work. The launcher was created with Add to
Panel/Custom Application Launcher/Command=xterm. Additional arguments
to xterm do not seem to affect whether or not it crashes.
I'm running Hardy i386 on a Core2Duo. I also experienced similar
failure to launch from xterm on Gutsy, on this same PC and on another
PC.
This appears in /var/log/syslog each time:
Aug 15 13:36:12 loki kernel: [66796.742525] xterm[18595]: segfault at
00044c10 eip 08077dbd esp bf9b4dc0 error 4
(esp varies but the other addresses are always the same).
No core dump is produced (ulimit -c is unlimited and a simple test app
which does "*(int*)0=0" does produce a core file), nor is there a crash
log in /var/crash (apport is enabled).
Changing the launcher command to run strace produced the attached log.
Downloading the source package & rebuilding with debugging enabled gave
me a core dump. The crash is at line 1684 of util.c in
handle_translated_exposure():
(gdb) where
#0 0x08082722 in handle_translated_exposure (xw=0x80c7478, rect_x=0,
rect_y=0, rect_width=499,
rect_height=316) at ../util.c:1684
#1 0x08082346 in HandleExposure (xw=0x80c7478, event=0xbfe29838) at
../util.c:1598
#2 0x0805aac4 in VTExpose (w=0x80c7478, event=0xbfe29838, region=0x0) at
../charproc.c:4803
#3 0x08073a36 in Redraw () at ../misc.c:1119
#4 0x0807da6e in ScrollBarOn (xw=0x80c7478, init=0, doalloc=1) at
../scrollbar.c:488
#5 0x0805db1f in VTRealize (w=0x80c7478, valuemask=0xbfe299d8,
values=0xbfe2998c)
at ../charproc.c:6250
#6 0xb7e5db71 in ?? () from /usr/lib/libXt.so.6
#7 0xb7e5dcfa in ?? () from /usr/lib/libXt.so.6
#8 0xb7e5df9e in XtRealizeWidget () from /usr/lib/libXt.so.6
#9 0x0805af82 in VTInit () at ../charproc.c:4976
#10 0x0806cc2d in spawnXTerm (xw=0x80c7478) at ../main.c:3245
#11 0x0806be0e in main (argc=0, argv=0xbfe2a918) at ../main.c:2289
Line 1684 is:
leftcol = x0 / CurFontWidth(screen, screen->cur_row);
screen is a valid pointer and much of what it points to looks sensible,
but screen->visbuf (used by CurFontWidth) does not point to a readable
memory location:
(gdb) x/32x screen->visbuf
0x44c00: Cannot access memory at address 0x44c00
** Affects: xterm (Ubuntu)
Importance: Undecided
Status: New
--
xterm segfaults when run via panel launcher
https://bugs.launchpad.net/bugs/258089
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