[LAD] ambix vs JUCE, segfault

[Fernando Lopez-Lezcano]

On 04/13/2015 11:24 AM, Paul Davis wrote:
> definitely caused by use of X / GUI toolkit calls from the wrong thread.
> Not legal.

Ok, thanks, staring at code - no idea what to look for (Ambix uses the 
JUCE LV2 wrapper) ...

On my laptop (Fedora 21 instead of Fedora 20, different video chipset) 
the GUI starts fine but it can randomly crash with the same message. 
Race condition that is sometimes triggered?

Anyone our there running the Ambix LV2 plugins successfully? (in, for 
example, Ardour3?)
-- Fernando


> On Mon, Apr 13, 2015 at 2:06 PM, Fernando Lopez-Lezcano
> <nando at ccrma.stanford.edu <mailto:nando at ccrma.stanford.edu>> wrote:
>
>     On 04/13/2015 07:13 AM, Tito Latini wrote:
>
>         On Sun, Apr 12, 2015 at 07:29:41PM -0700, Fernando Lopez-Lezcano
>         wrote:
>
>             Anyone out there using ambix on Linux?
>
>             I'm seeing various instabilities, for example trying out the
>             converter
>             standalone I get a segfault when connecting output ports,
>             and it looks
>             like the Jack JUCE component is doing some unaligned memory
>             copies.
>
>             Any hint on how to fix this?
>
>             I get Ardour crashes if I try to use the converter LV2
>             plugin as well.
>
>             See below for a trace of the standalone binary...
>             Thanks for any help!
>             -- Fernando
>             [...]
>
>
>         I have compiled the git-version and tested with the converter
>         standalone.
>
>         The attached patch should fix this problem.
>
>
>     Thanks Tito!
>     That seems to have fixed that problem. But I'm still having other
>     problems :-(
>
>     On a different machine I see this problem when I try to bring up the
>     LV2 GUI for the encoder plugin in, say, ardour3:
>
>     [xcb] Unknown request in queue while dequeuing
>     [xcb] Most likely this is a multi-threaded client and XInitThreads
>     has not been called
>     [xcb] Aborting, sorry about that.
>     xcb_io.c: 179: dequeue_pending_request: Assertion
>     xcb_xlib_inknown_req_in_deq'__failed
>
>     And then ardour3 crashes.
>     -- Fernando
>
>
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