[lttng-dev] Valgrind Memory Error in lttng-relayd

[Jérémie Galarneau]

Hi,

Thanks for the detailed report. Can you provide a sequence of steps that
leads to this problem?
Also, did you modify lttng-relayd at all to be able to run valgrind? I seem
to remember valgrind not supporting clone().

Thanks,
Jérémie

On Thu, Jul 2, 2015 at 12:42 PM, Aravind HT <aravind.ht at gmail.com> wrote:

> Possible Solution :
>
> The following changes seem to be missing from the actual code
>
>
> http://git.lttng.org/?p=lttng-tools.git;a=commitdiff;h=cd2ef1ef1d54ced9e4d0d03b865bb7fc6a905f80
>
>
> only the connection.h changes have been absorbed, while the main.c changes
> left out.
>
> On Mon, Jun 29, 2015 at 11:51 PM, Aravind HT <aravind.ht at gmail.com> wrote:
>
>> Hi,
>>
>> I ran valgrind on lttng-relayd for a soft hang issue that I had reported
>> earlier.
>> http://lists.lttng.org/pipermail/lttng-dev/2015-May/024533.html
>>
>> Below are the list of errors that I found.
>>
>> ==793== Thread 4:
>> ==793== Invalid write of size 8
>> ==793==    at 0x406038: cds_list_add (list.h:53)
>> ==793==    by 0x409442: queue_stream (main.c:1175)
>> ==793==    by 0x409AB7: relay_add_stream (main.c:1274)
>> ==793==    by 0x40C47A: relay_process_control (main.c:2099)
>> ==793==    by 0x40DBB1: relay_thread_worker (main.c:2574)
>> ==793==    by 0x5BDAFE2: start_thread (pthread_create.c:312)
>> ==793==    by 0x5ED8AFC: clone (clone.S:111)
>> ==793==  Address 0x6e09040 is 64 bytes inside a block of size 312 free'd
>> ==793==    at 0x4C2898C: free (in
>> /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
>> ==793==    by 0x418EF8: rcu_destroy_stream (stream.c:33)
>> ==793==    by 0x5079C94: ??? (in /usr/lib64/liburcu.so.2.0.0)
>> ==793==    by 0x5BDAFE2: start_thread (pthread_create.c:312)
>> ==793==    by 0x5ED8AFC: clone (clone.S:111)
>> ==793==
>>
>> Are there any known bugs/fixes for these ?
>>
>>
>> Regards,
>> Aravind.
>>
>>
>
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>


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