[Virtual-pkg-base-maintainers] Bug#443375: additional information

[Christian Gogolin]

To further investigate the Problem I modified "/etc/acpi/prepare.sh" as 
follows.

#!/bin/sh

echo "`date` prepare.sh started" >> /home/cgogolin/tmp/crash.log
sync

# sync harddrives befor anything else is done
sync

for SCRIPT in /etc/acpi/suspend.d/*.sh; do
     echo "`date`  starting script $SCRIPT" >> /home/cgogolin/tmp/crash.log
     sync

     . $SCRIPT
done

echo "`date` prepare.sh done" >> /home/cgogolin/tmp/crash.log
sync


Using this modified file I was able to record this log during the last 
crash.

...
Sat Sep 22 12:20:31 CEST 2007 prepare.sh started
Sat Sep 22 12:20:31 CEST 2007  starting script 
/etc/acpi/suspend.d/05-acpi-lock.sh
Sat Sep 22 12:20:31 CEST 2007  starting script 
/etc/acpi/suspend.d/10-thinkpad-standby-led.sh
Sat Sep 22 12:20:31 CEST 2007  starting script 
/etc/acpi/suspend.d/30-proc-sysfs-save-state.sh
Sat Sep 22 12:20:31 CEST 2007  starting script 
/etc/acpi/suspend.d/50-irda-stop.sh
Sat Sep 22 12:20:31 CEST 2007  starting script 
/etc/acpi/suspend.d/50-time.sh
Sat Sep 22 12:20:34 CEST 2007  starting script 
/etc/acpi/suspend.d/50-tosh-save-brightness.sh
Sat Sep 22 12:20:34 CEST 2007  starting script 
/etc/acpi/suspend.d/55-down-interfaces.sh
Sat Sep 22 12:20:36 CEST 2007  starting script 
/etc/acpi/suspend.d/60-generate-modules-list.sh
Sat Sep 22 12:20:36 CEST 2007  starting script 
/etc/acpi/suspend.d/65-services-stop.sh
Sat Sep 22 12:20:36 CEST 2007  starting script 
/etc/acpi/suspend.d/70-modules-unload.sh
Sat Sep 22 12:20:36 CEST 2007  starting script 
/etc/acpi/suspend.d/75-console-switch.sh


So the crash seams to happen while "75-console-switch.sh" is executed.

If it is this script that causes the system to crash and not an other 
process running simultaneously it should not be too difficult to 
identify the problem.

$ cat 75-console-switch.sh
#!/bin/sh

# And remember which console we're on
CONSOLE=`fgconsole`

# Change away from X, otherwise it'll blow up when we POST the video 
interface
chvt 12


I now consider the program "chvt" to be the primary suspect. I think it 
would fit well into the symptomatology described above. It has something 
to do with video output ant thus might caus the pixel patterns and it is 
called during suspend and hibernation and might (?) es well be called 
during logout.

I repaced the last line of "75-console-switch.sh" with

strace -t -o /home/cgogolin/tmp/chvt.trace chvt 12
sync


hoping that "strace" will manage to write the trace to disc before the 
system locks up.


Although now there is some evidence that this bug is not related to the 
base system but to "chvt" I would like to see this report being kept 
open until there is really _strong_ evidence that "chvt" is the malefactor.

Suppose the problem is in "chvt", if "strace" fails to write the trace 
to disk, is there any other way of getting more information on what 
exactly causes the crash?
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