[Bug 1371] DVD: installation hangs, needs ctrl-c to continue
http://bugs.skolelinux.org/show_bug.cgi?id=1371
--- Comment #38 from Petter Reinholdtsen <pere@hungry.com> 2009-12-13 21:00:37 ---
I've investigated some more, trying to figure out what the problem is.
I believe the problem is that several processes talk to the debconf backend in
parallel, and this is the cause of the race condition.
I've been able to reproduce this error, and also was able to get one successful
installation. Here is an interesting part from the diff of the installation
log between the two installation. (-) marks the hanging installation and (+)
the non-hanging.
in-target: invoke-rc.d nfs-kernel-server reload
in-target: info: LTSP client installation completed successfully
debconf: --> PROGRESS STOP
-main-menu[1067]: (process:26991): /bin/debconf-get:
-main-menu[1067]: (process:26991): return:
-main-menu[1067]: (process:26991): line 4:
-main-menu[1067]: (process:26991): Illegal number: d-i
-main-menu[1067]: (process:26991):
-main-menu[1067]: INFO: Priority changed externally, setting main-menu default
to 'medium' (O
K)
debconf: <-- 0 OK
-debconf: --> GET debconf/priority GET debconf/priority X_SAVE METAGET
debian-installer/ethde
tect/title Description GET auto-install/enable
+main-menu[1067]: (process:27031): /bin/debconf-get:
+main-menu[1067]: (process:27031): return:
+main-menu[1067]: (process:27031): line 4:
+main-menu[1067]: (process:27031): Illegal number: d-i
+main-menu[1067]: (process:27031):
+main-menu[1067]: INFO: Priority changed externally, setting main-menu default
to 'medium' (O
K)
+debconf: --> GET debconf/priority
+debconf: <-- 0 critical
+debconf: --> GET debconf/priority X_SAVE METAGET
debian-installer/ethdetect/title Descriptio
n
debconf: <-- 20 Incorrect number of arguments
+debconf: --> GET auto-install/enable
+debconf: <-- 0 false
debconf: --> METAGET debian-installer/localechooser/title Description
debconf: <-- 0 Velg språk/Choose language
I am pretty sure the X_SAVE action come from a exiting debconf client, and thus
that several processes are talking to debconf at the same time and on the same
pipe.
I've been unable to locate exactly which processes are involved. I tested to
see if the problem was that that the postinst process for ltsp-client-builder
udeb would exit before the ltsp-build-client process called from it, but adding
a wait call before "db_progress STOP" did not solve the problem.
I've written a new tool pipegraph in debian-edu-config to see if I can use it
to locate the processes talking to the debconf backend at the same time. Not
sure if it will lead to anything, but worth a try.
--
Configure bugmail: http://bugs.skolelinux.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.
You are watching all bug changes.
Reply to: