gdb of crash and ktrace from DragonFly (and remote access to DragonFly for xserver work)

[Jeremy C. Reed]

On Sat, 11 Mar 2006, Matthieu Herrb wrote:

> I'd suggest you try with 'Option "NoTrapSignals" "True"' in the 'ServerFlags'
> section in xorg.conf. This will probably provide a better stack trace.

Thanks.

This is the Xorg core dump of when I attempt to start a client.

(gdb) bt
#0  0x281aec72 in tls_get_addr_common () from /usr/libexec/ld-elf.so.2
#1  0x281b0e6c in ___tls_get_addr () from /usr/libexec/ld-elf.so.2
#2  0x28373ee5 in .cerror () from /usr/lib/libc.so.6
#3  0x28381824 in ?? () from /usr/lib/libc.so.6
#4  0x283112f1 in usleep () from /usr/lib/libc.so.6
#5  0x080d3ed3 in xf86usleep (usec=300000) at ./../shared/libc_wrapper.c:1199
#6  0x284607bb in MouseProc (device=0x822e100, what=0) at mouse.c:1778
#7  0x08079daf in CloseDevice (dev=0x822e100) at devices.c:213
#8  0x08079e80 in CloseDownDevices () at devices.c:294
#9  0x0806c32d in main (argc=1, argv=0xbfbffbcc, envp=0xbfbffbd4) at 
main.c:469

Now with NoTrapSignals, my screen never gets reset. Is there any tool for 
resetting my screen so I can see my console again (without rebooting)?

I have repeated the above (same gdb backtrace with different core dumps) a 
few times. The last time I used a libX11 that was built with 
--disable-xthreads. I ran:

glacier# env LD_LIBRARY_PATH=/home/reed/xorg/lib /home/reed/xorg/bin/xlsclients -display :0
XIO:  fatal IO error 54 (Connection reset by peer) on X server "localhost:0.0"
      after 3 requests (0 known processed) with 0 events remaining.

Then the Xorg display hung. Xorg crashed and I got a core dump (back trace 
is above.

Probably not related, but I can also get consistent segmentation faults 
immediately at Xorg startup when /tmp/.tX0-lock exists at startup (and 
maybe /tmp/.X0-lock also):

(gdb) bt
#0  0x281aec72 in tls_get_addr_common () from /usr/libexec/ld-elf.so.2
#1  0x281b0e6c in ___tls_get_addr () from /usr/libexec/ld-elf.so.2
#2  0x28373ee5 in .cerror () from /usr/lib/libc.so.6
#3  0x081b62c4 in ?? ()
#4  0x08182a9b in LockServer () at utils.c:477
#5  0x081825e1 in OsInit () at osinit.c:208
#6  0x0806bfe3 in main (argc=1, argv=0xbfbffaac, envp=0xbfbffab4) at 
main.c:315
(gdb)

I remove that file and then Xorg starts (and I can move the mouse but no 
clients will run or I get the first core dump as showed above).

 Jeremy C. Reed