On Thu, 9 Jul 2009, Sebastian Moors wrote:
> Hi everyone,
>
> i'm getting a quite reproducable segfault when using the alsa driver.
>
> The following steps work for me to get the bug on different systems:
>
> 1. Start jackd --driver alsa ( so it blocks the alsa device for hydrogen )
> 2. Start hydrogen --driver alsa
> 3. see Backtrace below ..
>
> I can't get it everytime, but it happens one in two times.
> - Sebastian
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x00007ffff5664cb3 in __dynamic_cast () from /usr/lib/libstdc++.so.6
> (gdb) bt
> #0 0x00007ffff5664cb3 in __dynamic_cast () from /usr/lib/libstdc++.so.6
> #1 0x0000000000553850 in H2Core::Sampler::makeTrackOutputQueues (
> this=0x9d9be0) at libs/hydrogen/src/sampler/sampler.cpp:752
I think the attached patch will fix this. However, please don't apply it
to SVN because I'd like to review this section of code. I think I may
have seen another subtle error. I also want to make sure we're not
sharing the pointer with anyone else.
Peace,
Gabriel
diff --git a/libs/hydrogen/src/hydrogen.cpp b/libs/hydrogen/src/hydrogen.cpp
index 1529058..baa0007 100644
--- a/libs/hydrogen/src/hydrogen.cpp
+++ b/libs/hydrogen/src/hydrogen.cpp
@@ -1666,6 +1666,7 @@ void audioEngine_startAudioDrivers()
delete m_pAudioDriver;
m_pAudioDriver = new NullDriver( audioEngine_process );
mx.unlock();
+
AudioEngine::get_instance()->get_sampler()->set_audio_output( m_pAudioDriver );
m_pAudioDriver->init( 0 );
m_pAudioDriver->connect();
}
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