[lttng-dev] not able to read 32-bit app traces running on a 64-bit system with relayd

[Jérémie Galarneau]

On Tue, Dec 2, 2014 at 1:10 PM, Anand Neeli <anand.neeli at gmail.com> wrote:
> Hi Jérémie,
> Thanks for verifying this.
>
> Is this a issue with relayd? or babeltrace?
> Coz i see this only with 32-bit applications running on a 64-bit system,
> along with relay of traces using relayd

It's caused by a bug in the communication between the session and
consumer daemons of different bitness.
I'm working on a fix which will be back-ported to 2.4, 2.5 and 2.6.

I'll keep you posted as soon as it is available.

Regards,
Jérémie

>
> Thanks,
> Anand Neeli
>
> On Tue, Dec 2, 2014 at 11:03 PM, Jérémie Galarneau
> <jeremie.galarneau at efficios.com> wrote:
>>
>> On Tue, Dec 2, 2014 at 8:01 AM, Anand Neeli <anand.neeli at gmail.com> wrote:
>> > Hi All,
>> > I have verified that i'm able to read the attached 32-bit and 64-bit
>> > traces
>> > using eclipse trace compass.
>> > Where as babeltrace fails to read 32-bit traces.
>> > Can anyone please let me know what could be the issue here.
>> >
>>
>> Deleting the index folder of the 32 bit trace seems to make it
>> possible for babeltrace to read the trace... Reproducible on
>> Babeltrace master.
>>
>> Would you mind opening a bug report against Babeltrace on bugs.lttng.org?
>>
>> Thanks,
>> Jérémie
>>
>> > Thanks,
>> > Anand Neeli
>> >
>> > ---------- Forwarded message ----------
>> > From: Anand Neeli <anand.neeli at gmail.com>
>> > Date: Thu, Nov 27, 2014 at 5:01 PM
>> > Subject: not able to read 32-bit app traces running on a 64-bit system
>> > with
>> > relayd
>> > To: "lttng-dev at lists.lttng.org" <lttng-dev at lists.lttng.org>
>> >
>> >
>> > Hi All,
>> > I'm running both 32-bit and 64-bit app's on a 64-bit system.  I have
>> > consumerd's build for both 32-bit and 64-bits (followed
>> > http://lttng.org/docs/#doc-instrumenting-32-bit-app-on-64-bit-system)
>> >
>> > I'm seeing problem in reading 32-bit app traces, although it is logging
>> > something and logfile size in lttng-traces/ is increasing.
>> > I have compiled same app for 64-bit and it works fine.
>> >
>> > One more point here is that, this happens only when relaying traces.
>> > Without
>> > using relayd and by using local tracing i dont see any issues.
>> >
>> > Attached are the logs from 32-bit and 64-bit app's. There sizes are same
>> > except the files in index/
>> >
>> > I'm using 2.4.1 lttng and tried 1.2.0 and 1.2.1 version of babeltrace.
>> >
>> > Can anyone please tell me how can i avoid this problem.
>> >
>> > Thanks,
>> > Anand Neeli
>> >
>> >
>> > _______________________________________________
>> > lttng-dev mailing list
>> > lttng-dev at lists.lttng.org
>> > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
>> >
>>
>>
>>
>> --
>> Jérémie Galarneau
>> EfficiOS Inc.
>> http://www.efficios.com
>
>



-- 
Jérémie Galarneau
EfficiOS Inc.
http://www.efficios.com