dbus_connection_send_with_reply_and_block eats 100% CPU then eventually times out

[Alex Brooks]

On 01/02/15 03:12, Ralf Habacker wrote:
>
> Am 31.01.2015 um 16:10 schrieb Ralf Habacker:
>>
>> Am 31.01.2015 um 14:49 schrieb Ralf Habacker:
>>>> 5 19:27, "Ralf Habacker" <ralf at habacker.de 
>>>> <mailto:ralf at habacker.de>> wrote:
>>>>
>>>>
>>>>     Am 31.01.2015 um 05:04 schrieb Alex Brooks:
>>>>     > Hi,
>>>>     >
>>>>     > I've been fighting for a long time with what now looks like a
>>>>     libdbus
>>>>     > bug.
>>>>     > I have a cut-down test program which calls a dbus method of
>>>>     > wpa_supplicant at 100Hz, it does this happily for several
>>>>     hours then
>>>>     > at some point the behaviour changes: any future calls sit at
>>>>     100% CPU
>>>>     > for 25sec then time out.
>>>>
>> After running about 54 minutes I got:
>>
>>  counts      time (ms)
>> 300272 3245606 signalInfo rssi=-63
>> 300273 3245616 signalInfo rssi=-63
>> Error: wpa_supplicant DBus error in signalPoll: Did not receive a 
>> reply. Possible causes include: the remote application did not send a 
>> reply, the message bus security policy blocked the reply, the reply 
>> timeout expired, or the network connection was broken.
>>
> second run gave same results:
> ...
>
> 300272 3548324 1 signalInfo rssi=-57
> 300273 3548413 79 signalInfo rssi=-59
> Error: wpa_supplicant DBus error in signalPoll: Did not receive a 
> reply. Possible causes include: the remote application did not send a 
> reply, the message bus security policy blocked the reply, the reply 
> timeout expired, or the network connection was broken.

In my case when it's in this state, it consumes 100% CPU.

> Sounds as a kind of limits reached. The counts are collected as shown 
> below:
>
>     while ( true )
>     {
>         try {
>             int a = timer.elapsed();
>             int rssi = signalPoll( *netDevInterfaceInterface_ );
>             int b = timer.elapsed();
>             cout << i++ << " " << b << " " << (b-a) << " signalInfo 
> rssi=" << rssi << endl;
>         }
>
>> Ralf
>>
>>
>> _______________________________________________
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>> dbus at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/dbus
>


-- 
------------------------------
Dr Alex Brooks
Marathon Targets Pty Ltd
Ph: +61 2 8090 7202
Web: www.marathon-targets.com
------------------------------

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