when stopping GPRS connection , framworkd does not respond to most queries and blocks

[zoff99]

when stopping GPRS connection , framworkd does not respond to most queries and blocks

this is what i do:

root@om-gta02:~# mdbus -s org.freesmartphone.ogsmd /org/freesmartphone/GSM/Device org.freesmartphone.GSM.PDP.DeactivateContext 2> /dev/null

root@om-gta02:~# mdbus -s org.freesmartphone.ogsmd  2> /dev/null
/
    

on other shell i look with strace:

root@om-gta02:~# ps aux|grep -e mdbus -e frame
root      1631  6.3 16.2  60516 19652 ?        Ssl  17:16   8:26 python /usr/bin/frameworkd
root      2774 11.9  4.5   9340  5452 pts/4    S+   19:28   0:02 python /usr/bin/mdbus -s org.freesmartphone.ogsmd

root@om-gta02:~# strace -p 2774
Process 2774 attached - interrupt to quit
restart_syscall(<... resuming interrupted call ...>

root@om-gta02:~# strace -p 1631
Process 1631 attached - interrupt to quit
futex(0x1bca90, FUTEX_WAIT, 0, NULL^C <unfinished ...>

everything just blocks and freezes up

only fix it to restart mdbus and frameworkd

[tdilo]

frameworkd.log excerpt up to the point where it freezes

[tdilo]

another hang

[tdilo]

frameworkd.log where it continues normally

[tdilo]

Since updating two Debian installations (on two machines) to the latest (packaged) fsousaged, fso-abyss and openmoko-panel-plugin, I am also experiencing this bug. It does not happen every time the GPRS connection is disabled, but it is very rare that I need more than three tries to get frameworkd and dbus (I think) to freeze up, either by using mdbus or o-p-p to control the GPRS connection.

I've been using the latest packaged frameworkd with o-p-p 0.9, the old muxer and ousaged for quite some time and the freeze did not occur in that scenario. I did some quick tests while on the road and the hanging still happens when either using the old muxer, ousaged and no panel plugin running. It seems that neither of the new components alone are causing the bug directly.

As my knowledge of the inner workings of the whole system (and my spare time) is rather limited, I attached some log excerpts of both successful and unsuccessful GPRS connection shutdowns; In one case, a normal gprs disconnect (normal4.txt) is followed directly by a hang on the next connect-disconnect cylce (hang3.txt). The other logs are in no particular order.

The hang only seems to occur when calypso answers with both OK and NO CARRIER to whatever is sent to it before - the normal connection shutdowns don't contain NO CARRIER in the response:

<MiscChannel? via /dev/pts/1>: sending 21 bytes: 'AT+CGACT=0;+CGATT=0\r\n'

"bad" calypso response: <MiscChannel? via /dev/pts/1>: got 20 bytes: '\r\nOK\r\n\r\nNO CARRIER\r\n' "good" calypso response: <MiscChannel? via /dev/pts/1>: got 6 bytes: '\r\nOK\r\n'

I couldn't reproduce the bug with both frameworkd and dbus running through strace. Maybe just bad luck.

[sim]

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[mickey]

Unfortunately we did not call waitpid(), hence there was a certain likelyness of ppp being zombiefied.

commit 93673aa09cafc8fb5cfc3cb4055a73e25e595b70 Author: Michael 'Mickey' Lauer <mickey@…> Date: Tue May 11 00:40:37 2010 +0200

processguard: attempt to fix zombie at process shutdown