Dear Julien and Michel, I rebuilt the xorg-server pacakge as explained, and it seems that the system noticed that I was spying it because then it did not crash for a while ;)
But as soon as I relaxed my "save every 5 minutes" policy, the bug stroke back. I logged in by ssh, but did not manage to use gdb: gslc12『~』$ cat gdb-pb gslc12『~』$ sudo gdb -p $(pidof X) Password: GNU gdb 6.4.90-debian Copyright (C) 2006 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 "powerpc-linux-gnu". Attaching to process 3213 /build/buildd/gdb-6.4.90.dfsg/gdb/linux-nat.c:1025: internal-error: linux_nat_attach: Assertion `pid == GET_PID (inferior_ptid) && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP' failed. A problem internal to GDB has been detected, further debugging may prove unreliable. Quit this debugging session? (y or n) Strangely, after this problem, Xorg became immortal : I had to reboot to get rid of it. Obviously I am doing something wrong: can you help me to find out what? Have a nice day, -- Charles Plessy http://charles.plessy.org Wako, Saitama, Japan