segfault when opening LV2 UI while having Odin2 LV2 UI open in a DAW

[alex-tee]

happens in both ardour and zrythm

valgrind output:

==1555156== Memcheck, a memory error detector
==1555156== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==1555156== Using Valgrind-3.16.1 and LibVEX; rerun with -h for copyright info
==1555156== Command: build/src/zrythm --dummy --buf-size=16000
==1555156== Parent PID: 1514
==1555156== 
--1555156-- WARNING: unhandled amd64-linux syscall: 315
--1555156-- You may be able to write your own handler.
--1555156-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
--1555156-- Nevertheless we consider this a bug.  Please report
--1555156-- it at http://valgrind.org/support/bug_reports.html.
--1555156-- WARNING: unhandled amd64-linux syscall: 439
--1555156-- You may be able to write your own handler.
--1555156-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
--1555156-- Nevertheless we consider this a bug.  Please report
--1555156-- it at http://valgrind.org/support/bug_reports.html.
--1555156-- WARNING: unhandled amd64-linux syscall: 439
--1555156-- You may be able to write your own handler.
--1555156-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
--1555156-- Nevertheless we consider this a bug.  Please report
--1555156-- it at http://valgrind.org/support/bug_reports.html.
--1555156-- WARNING: unhandled amd64-linux syscall: 439
--1555156-- You may be able to write your own handler.
--1555156-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
--1555156-- Nevertheless we consider this a bug.  Please report
--1555156-- it at http://valgrind.org/support/bug_reports.html.
==1555156== Invalid read of size 8
==1555156==    at 0x7A7CC2AD: juce::Image::convertedToFormat(juce::Image::PixelFormat) const (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A7FED9B: juce::DropShadow::drawForImage(juce::Graphics&, juce::Image const&) const (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9BBC62: FullInterface::paintBackground(juce::Graphics&) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9BC0FB: FullInterface::checkBackground() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9BC5C4: FullInterface::resized() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A854838: juce::Component::sendMovedResizedMessages(bool, bool) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9E891D: HelmEditor::resized() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A854838: juce::Component::sendMovedResizedMessages(bool, bool) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9E8867: HelmEditor::HelmEditor(HelmPlugin&) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A963943: HelmPlugin::createEditor() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A6FEE9B: juce::AudioProcessor::createEditorIfNeeded() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A6D8C4B: JuceLv2UIWrapper::JuceLv2UIWrapper(juce::AudioProcessor*, void (*)(void*, unsigned int, unsigned int, unsigned int, void const*), void*, void**, _LV2_Feature const* const*, bool) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==  Address 0x4f2fc7a0 is 8 bytes after a block of size 8 alloc'd
==1555156==    at 0x483EDEF: operator new(unsigned long) (vg_replace_malloc.c:342)
==1555156==    by 0x6CB13CF4: make_unique<juce::SoftwareImageType> (unique_ptr.h:962)
==1555156==    by 0x6CB13CF4: juce::SoftwarePixelData::createType() const (juce_Image.cpp:116)
==1555156==    by 0x7A7CC291: juce::Image::convertedToFormat(juce::Image::PixelFormat) const (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A7FED9B: juce::DropShadow::drawForImage(juce::Graphics&, juce::Image const&) const (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9BBC62: FullInterface::paintBackground(juce::Graphics&) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9BC0FB: FullInterface::checkBackground() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9BC5C4: FullInterface::resized() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A854838: juce::Component::sendMovedResizedMessages(bool, bool) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9E891D: HelmEditor::resized() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A854838: juce::Component::sendMovedResizedMessages(bool, bool) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9E8867: HelmEditor::HelmEditor(HelmPlugin&) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A963943: HelmPlugin::createEditor() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156== 
==1555156== Jump to the invalid address stated on the next line
==1555156==    at 0x100000008: ???
==1555156==    by 0x7A7FED9B: juce::DropShadow::drawForImage(juce::Graphics&, juce::Image const&) const (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9BBC62: FullInterface::paintBackground(juce::Graphics&) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9BC0FB: FullInterface::checkBackground() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9BC5C4: FullInterface::resized() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A854838: juce::Component::sendMovedResizedMessages(bool, bool) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9E891D: HelmEditor::resized() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A854838: juce::Component::sendMovedResizedMessages(bool, bool) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9E8867: HelmEditor::HelmEditor(HelmPlugin&) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A963943: HelmPlugin::createEditor() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A6FEE9B: juce::AudioProcessor::createEditorIfNeeded() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A6D8C4B: JuceLv2UIWrapper::JuceLv2UIWrapper(juce::AudioProcessor*, void (*)(void*, unsigned int, unsigned int, unsigned int, void const*), void*, void**, _LV2_Feature const* const*, bool) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==  Address 0x100000008 is not stack'd, malloc'd or (recently) free'd
==1555156== 
==1555156== Invalid read of size 1
==1555156==    at 0x6686700: x86_64_fallback_frame_state (md-unwind-support.h:63)
==1555156==    by 0x6686700: uw_frame_state_for (unwind-dw2.c:1271)
==1555156==    by 0x668833A: _Unwind_Backtrace (unwind.inc:302)
==1555156==    by 0xAEF730: backtrace_full (in /home/alex/Documents/git/zrythm/build/src/zrythm)
==1555156==    by 0xAEF453: backtrace_print (in /home/alex/Documents/git/zrythm/build/src/zrythm)
==1555156==    by 0x9F289E: _backtrace_get (backtrace.c:333)
==1555156==    by 0x95708B: segv_handler (zrythm_app.c:147)
==1555156==    by 0x66CDF7F: ??? (in /usr/lib/libc-2.33.so)
==1555156==    by 0x100000007: ???
==1555156==    by 0x7A7FED9B: juce::DropShadow::drawForImage(juce::Graphics&, juce::Image const&) const (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9BBC62: FullInterface::paintBackground(juce::Graphics&) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9BC0FB: FullInterface::checkBackground() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9BC5C4: FullInterface::resized() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==  Address 0x100000008 is not stack'd, malloc'd or (recently) free'd
==1555156== 
==1555156== 
==1555156== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==1555156==  Access not within mapped region at address 0x100000008
==1555156==    at 0x6686700: x86_64_fallback_frame_state (md-unwind-support.h:63)
==1555156==    by 0x6686700: uw_frame_state_for (unwind-dw2.c:1271)
==1555156==    by 0x668833A: _Unwind_Backtrace (unwind.inc:302)
==1555156==    by 0xAEF730: backtrace_full (in /home/alex/Documents/git/zrythm/build/src/zrythm)
==1555156==    by 0xAEF453: backtrace_print (in /home/alex/Documents/git/zrythm/build/src/zrythm)
==1555156==    by 0x9F289E: _backtrace_get (backtrace.c:333)
==1555156==    by 0x95708B: segv_handler (zrythm_app.c:147)
==1555156==    by 0x66CDF7F: ??? (in /usr/lib/libc-2.33.so)
==1555156==    by 0x100000007: ???
==1555156==    by 0x7A7FED9B: juce::DropShadow::drawForImage(juce::Graphics&, juce::Image const&) const (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9BBC62: FullInterface::paintBackground(juce::Graphics&) (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9BC0FB: FullInterface::checkBackground() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==    by 0x7A9BC5C4: FullInterface::resized() (in /usr/lib/lv2/helm-synth.lv2/helm-synth.so)
==1555156==  If you believe this happened as a result of a stack
==1555156==  overflow in your program's main thread (unlikely but
==1555156==  possible), you can try to increase the size of the
==1555156==  main thread stack using the --main-stacksize= flag.
==1555156==  The main thread stack size used in this run was 8388608.
==1555156== 
==1555156== HEAP SUMMARY:
==1555156==     in use at exit: 1,215,418,747 bytes in 2,203,548 blocks
==1555156==   total heap usage: 12,304,552 allocs, 10,101,004 frees, 4,971,582,871 bytes allocated
==1555156== 
==1555156== LEAK SUMMARY:
==1555156==    definitely lost: 4,215,833 bytes in 1,037 blocks
==1555156==    indirectly lost: 535,858 bytes in 16,290 blocks
==1555156==      possibly lost: 2,662,412 bytes in 11,985 blocks
==1555156==    still reachable: 1,133,248,057 bytes in 1,347,480 blocks
==1555156==                       of which reachable via heuristic:
==1555156==                         multipleinheritance: 126,776 bytes in 1,926 blocks
==1555156==         suppressed: 70,066,291 bytes in 795,405 blocks
==1555156== Rerun with --leak-check=full to see details of leaked memory
==1555156== 
==1555156== For lists of detected and suppressed errors, rerun with: -s
==1555156== ERROR SUMMARY: 3 errors from 3 contexts (suppressed: 10 from 10)

[x42]

Looks like JUCE symbol conflicts.
Both plugins should be built with hidden and local symbols, and not expose JUCE into the global namespace.

[jcelerier]

also had this crash with the vst version