On Fri, Jun 11, 2004 at 11:03:40AM -0700, Wade Richards wrote:
> Hi,
>
> I'm running xserver-xfree86 version 4.3.0.dfsg.1-1 on testing.
>
> I've had my X server crash 4 or 5 times in the past couple of weeks,
> usually when I'm viewing web pages in FireFox. I don't have a sequence
> of steps to reliably reproduce it, but it's happened enough times that I
> am confident it will happen again in the next week or so.
>
> Is there anything that I should do now---before the next crash---to help
> me collect the info needed for a good bug report? Some XFree86 option
> to get the server to dump core when it crashes? Extra verbose logging
> options?
It just so happens I have written up some information along these lines.
I expect to add them to the FAQ before long.
Can you reproduce the problem with xserver-xfree86-dbg? Install the
package and tell debconf you want to use that X server. Then restart
the X server and try to reproduce the bug (should be easy). If it
doesn't crash, let us know. If it does crash, become root, enable
core dumps ("ulimit -c unlimited" in bash), start the X server as
root and run neverball:
# startx $(which x-terminal-emulator) -- :1
(If no X server is running at DISPLAY=:0, you can leave off the "--
:1" part).
This will launch the X server running a lone terminal client with no
window manager. Run neverball from the prompt. If the X server
crashes, it should leave a core dump in /etc/X11.
We then run the GNU Debugger, GDB, on the core file and executable.
We're interested in a backtrace of execution. The X server has a
signal handler in it so it can do things like exit gracefully
(restoring the text console, and so forth), so we're not actually
interested in all the stack frames, those above the signal handler.
Here's an example GDB session I logged after provoking an artificial
server crash (with "kill -SEGV").
% gdb $(which XFree86-debug) core
GNU gdb 6.1-debian
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-linux"...Using host libthread_db library "/lib/libthread_db.so.1".
Core was generated by `/usr/X11R6/bin/X :1'.
Program terminated with signal 6, Aborted.
Reading symbols from /usr/lib/libfreetype.so.6...done.
Loaded symbols for /usr/lib/libfreetype.so.6
Reading symbols from /usr/lib/libz.so.1...done.
Loaded symbols for /usr/lib/libz.so.1
Reading symbols from /lib/libm.so.6...done.
Loaded symbols for /lib/libm.so.6
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
#0 0x400f2721 in kill () from /lib/libc.so.6
(gdb) bt
#0 0x400f2721 in kill () from /lib/libc.so.6
#1 0x400f24c5 in raise () from /lib/libc.so.6
#2 0x400f39e8 in abort () from /lib/libc.so.6
#3 0x08464b8c in ddxGiveUp () at xf86Init.c:1173
#4 0x08464c6b in AbortDDX () at xf86Init.c:1224
#5 0x08508bd7 in AbortServer () at utils.c:436
#6 0x0850a563 in FatalError (f=0x8a26ea0 "Caught signal %d. Server aborting\n") at utils.c:1421
#7 0x0847fbf5 in xf86SigHandler (signo=11) at xf86Events.c:1198
#8 <signal handler called>
#9 0x40199dd2 in select () from /lib/libc.so.6
#10 0x401f8550 in ?? () from /lib/libc.so.6
#11 0x400164a0 in ?? () from /lib/ld-linux.so.2
#12 0xbffff8f0 in ?? ()
#13 0x08502520 in WaitForSomething (pClientsReady=0xbffff944) at WaitFor.c:350
#14 0x084cff54 in Dispatch () at dispatch.c:379
#15 0x084e763c in main (argc=2, argv=0xbffffe04, envp=0xbffffe10) at main.c:469
(gdb) bt full -7
#9 0x40199dd2 in select () from /lib/libc.so.6
No symbol table info available.
#10 0x401f8550 in ?? () from /lib/libc.so.6
No symbol table info available.
#11 0x400164a0 in ?? () from /lib/ld-linux.so.2
No symbol table info available.
#12 0xbffff8f0 in ?? ()
No symbol table info available.
#13 0x08502520 in WaitForSomething (pClientsReady=0xbffff944) at WaitFor.c:350
i = 2
waittime = {tv_sec = 118, tv_usec = 580000}
wt = (struct timeval *) 0xbffff910
timeout = 599999
standbyTimeout = 1199999
suspendTimeout = 1799999
offTimeout = 2399999
clientsReadable = {fds_bits = {0 <repeats 32 times>}}
clientsWritable = {fds_bits = {1, 146318192, -1073743800, 140704020, 147350456, 147350040, 2, 312, 1, 1075418973, -1073743800, 139461033, 147374816, 1, -1073743680, 9, 1073833120, -1073742332,
-1073743784, 139526463, 9, -1073743680, 1, 139458611, 147350456, 147350040, -1073743752, 139529154, 147339744, -1073743680, 1, 1074655182}}
curclient = 147556952
selecterr = 3
nready = 0
devicesReadable = {fds_bits = {1, 1, 6, 146327832, 147350508, 0, 315, 302, 9, 3, 315, 302, 9, 3, 0, 0, 146318192, 1075807568, -1073743880, 137843170, 146125816, 3, 313, 147556952, 0, 15066597, 3,
-1, 147350500, 1, 0, 146319268}}
now = 16069
someReady = 0
#14 0x084cff54 in Dispatch () at dispatch.c:379
clientReady = (int *) 0xbffff944
result = 0
client = 0x8c8c2e0
nready = -1
icheck = (HWEventQueuePtr *) 0x8b45c68
start_tick = 940
#15 0x084e763c in main (argc=2, argv=0xbffffe04, envp=0xbffffe10) at main.c:469
i = 1
j = 2
k = 2
error = -1073742332
xauthfile = 0xbfffffba "/root/.Xauthority"
alwaysCheckForInput = {0, 1}
(gdb) quit
If you could send us something smiliar, that would be great.
--
G. Branden Robinson | It doesn't matter what you are
Debian GNU/Linux | doing, emacs is always overkill.
branden@debian.org | -- Stephen J. Carpenter
http://people.debian.org/~branden/ |
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