Crash in libgstreamer when loading URL with embedded video

[lukexi]

When attempting to load dynamicland.org an Ultralight gstreamer thread crashes with this backtrace:

(lldb) bt
* thread #34, name = 'matroskademux0:', stop reason = signal SIGSEGV: address access protected (fault address: 0x7f93800630c0)
  * frame #0: 0x00007f94991dfbd7 libc.so.6`___lldb_unnamed_symbol4335 + 1047
    frame #1: 0x00007f949313d45b libgstreamer-full-1.0.so`gst_queue2_create_read + 784
    frame #2: 0x00007f949313b44f libgstreamer-full-1.0.so`gst_queue2_get_range + 122
    frame #3: 0x00007f9493163762 libgstreamer-full-1.0.so`gst_pad_get_range_unchecked + 201
    frame #4: 0x00007f9493163b1f libgstreamer-full-1.0.so`gst_pad_pull_range + 289
    frame #5: 0x00007f949315ae6a libgstreamer-full-1.0.so`gst_proxy_pad_getrange_default + 46
    frame #6: 0x00007f9493163762 libgstreamer-full-1.0.so`gst_pad_get_range_unchecked + 201
    frame #7: 0x00007f9493163b1f libgstreamer-full-1.0.so`gst_pad_pull_range + 289
    frame #8: 0x00007f9493163762 libgstreamer-full-1.0.so`gst_pad_get_range_unchecked + 201
    frame #9: 0x00007f9493163b1f libgstreamer-full-1.0.so`gst_pad_pull_range + 289
    frame #10: 0x00007f94933aad64 libgstreamer-full-1.0.so`gst_matroska_demux_search_cluster + 311
    frame #11: 0x00007f94933aa8b0 libgstreamer-full-1.0.so`gst_matroska_demux_loop + 287
    frame #12: 0x00007f9493173e66 libgstreamer-full-1.0.so`gst_task_func + 324
    frame #13: 0x00007f9492c6347b libglib-2.0.so.0`g_thread_pool_thread_proxy + 126
    frame #14: 0x00007f9492c626e1 libglib-2.0.so.0`g_thread_proxy + 58
    frame #15: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #16: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11

[lukexi]

Backtrace of all threads, which might be more useful!

thread #1, name = 'lua'
    frame #0: 0x00007f9496a9f3f8 libWebCore.so`JSC::Scope::collectFreeVariables(JSC::Scope*, bool) + 728
    frame #1: 0x00007f9496aab43d libWebCore.so`JSC::Parser<JSC::Lexer<char16_t> >::popScopeInternal(JSC::ScopeRef&, bool) + 61
    frame #2: 0x00007f9496b282c8 libWebCore.so`bool JSC::Parser<JSC::Lexer<char16_t> >::parseFunctionInfo<JSC::ASTBuilder>(JSC::ASTBuilder&, JSC::FunctionNameRequirements, JSC::SourceParseMode, bool, JSC::ConstructorKind, JSC::SuperBinding, int, JSC::ParserFunctionInfo<JSC::ASTBuilder>&, JSC::Parser<JSC::Lexer<char16_t> >::FunctionDefinitionType, WTF::Optional<int>)::'lambda'()::operator()() const + 1032
    frame #3: 0x00007f9496b25f34 libWebCore.so`bool JSC::Parser<JSC::Lexer<char16_t> >::parseFunctionInfo<JSC::ASTBuilder>(JSC::ASTBuilder&, JSC::FunctionNameRequirements, JSC::SourceParseMode, bool, JSC::ConstructorKind, JSC::SuperBinding, int, JSC::ParserFunctionInfo<JSC::ASTBuilder>&, JSC::Parser<JSC::Lexer<char16_t> >::FunctionDefinitionType, WTF::Optional<int>) + 3684
    frame #4: 0x00007f9496b58981 libWebCore.so`JSC::ASTBuilder::Statement JSC::Parser<JSC::Lexer<char16_t> >::parseFunctionDeclaration<JSC::ASTBuilder>(JSC::ASTBuilder&, JSC::Parser<JSC::Lexer<char16_t> >::ExportType, JSC::DeclarationDefaultContext, WTF::Optional<int>) + 433
    frame #5: 0x00007f9496b57e45 libWebCore.so`JSC::ASTBuilder::Statement JSC::Parser<JSC::Lexer<char16_t> >::parseStatementListItem<JSC::ASTBuilder>(JSC::ASTBuilder&, JSC::Identifier const*&, unsigned int*) + 917
    frame #6: 0x00007f9496ab0fb1 libWebCore.so`JSC::ASTBuilder::SourceElements JSC::Parser<JSC::Lexer<char16_t> >::parseSourceElements<JSC::ASTBuilder>(JSC::ASTBuilder&, JSC::SourceElementsMode) + 305
    frame #7: 0x00007f9496b5ca16 libWebCore.so`JSC::ASTBuilder::Statement JSC::Parser<JSC::Lexer<char16_t> >::parseBlockStatement<JSC::ASTBuilder>(JSC::ASTBuilder&) + 534
    frame #8: 0x00007f9496b5c3a2 libWebCore.so`JSC::ASTBuilder::Statement JSC::Parser<JSC::Lexer<char16_t> >::parseStatement<JSC::ASTBuilder>(JSC::ASTBuilder&, JSC::Identifier const*&, unsigned int*) + 178
    frame #9: 0x00007f9496b57ca3 libWebCore.so`JSC::ASTBuilder::Statement JSC::Parser<JSC::Lexer<char16_t> >::parseStatementListItem<JSC::ASTBuilder>(JSC::ASTBuilder&, JSC::Identifier const*&, unsigned int*) + 499
    frame #10: 0x00007f9496ab0f59 libWebCore.so`JSC::ASTBuilder::SourceElements JSC::Parser<JSC::Lexer<char16_t> >::parseSourceElements<JSC::ASTBuilder>(JSC::ASTBuilder&, JSC::SourceElementsMode) + 217
    frame #11: 0x00007f9496aac239 libWebCore.so`JSC::Parser<JSC::Lexer<char16_t> >::parseInner(JSC::Identifier const&, JSC::SourceParseMode, JSC::ParsingContext, WTF::Optional<int>) + 1145
    frame #12: 0x00007f94963e7cc1 libWebCore.so`std::unique_ptr<JSC::FunctionNode, std::default_delete<JSC::FunctionNode> > JSC::Parser<JSC::Lexer<char16_t> >::parse<JSC::FunctionNode>(JSC::ParserError&, JSC::Identifier const&, JSC::SourceParseMode, JSC::ParsingContext, WTF::Optional<int>) + 161
    frame #13: 0x00007f94963e736c libWebCore.so`std::unique_ptr<JSC::FunctionNode, std::default_delete<JSC::FunctionNode> > JSC::parse<JSC::FunctionNode>(JSC::VM*, JSC::SourceCode const&, JSC::Identifier const&, JSC::JSParserBuiltinMode, JSC::JSParserStrictMode, JSC::JSParserScriptMode, JSC::SourceParseMode, JSC::SuperBinding, JSC::ParserError&, JSC::JSTextPosition*, JSC::ConstructorKind, JSC::DerivedContextType, JSC::EvalContextType, JSC::DebuggerParseData*) + 588
    frame #14: 0x00007f94963e6363 libWebCore.so`JSC::UnlinkedFunctionExecutable::unlinkedCodeBlockFor(JSC::VM&, JSC::SourceCode const&, JSC::CodeSpecializationKind, WTF::OptionSet<JSC::CodeGenerationMode>, JSC::ParserError&, JSC::SourceParseMode) + 195
    frame #15: 0x00007f9496d241ec libWebCore.so`JSC::ScriptExecutable::newCodeBlockFor(JSC::CodeSpecializationKind, JSC::JSFunction*, JSC::JSScope*, JSC::Exception*&) + 1068
    frame #16: 0x00007f9496d24d92 libWebCore.so`JSC::ScriptExecutable::prepareForExecutionImpl(JSC::VM&, JSC::JSFunction*, JSC::JSScope*, JSC::CodeSpecializationKind, JSC::CodeBlock*&) + 82
    frame #17: 0x00007f9496a5c5dc libWebCore.so`JSC::LLInt::setUpCall(JSC::ExecState*, JSC::CodeSpecializationKind, JSC::JSValue, JSC::LLIntCallLinkInfo*) + 1020
    frame #18: 0x00007f9496a44687 libWebCore.so`llint_op_call + 264
    frame #19: 0x00007ffd04b863d0
    frame #20: 0x00007f944e970e78
    frame #21: 0x00007f9496a44695 libWebCore.so`llint_op_call + 278
    frame #22: 0x00007f9496a44695 libWebCore.so`llint_op_call + 278
    frame #23: 0x00007f9496a44695 libWebCore.so`llint_op_call + 278
    frame #24: 0x00007f9496a44695 libWebCore.so`llint_op_call + 278
    frame #25: 0x00007f9496a44695 libWebCore.so`llint_op_call + 278
    frame #26: 0x00007f9496a44695 libWebCore.so`llint_op_call + 278
    frame #27: 0x00007f9496a44695 libWebCore.so`llint_op_call + 278
    frame #28: 0x00007f9496a44695 libWebCore.so`llint_op_call + 278
    frame #29: 0x00007f9496a44695 libWebCore.so`llint_op_call + 278
    frame #30: 0x00007f9496a44695 libWebCore.so`llint_op_call + 278
    frame #31: 0x00007f9496a2dadd libWebCore.so`vmEntryToJavaScript + 200
    frame #32: 0x00007f9496937eca libWebCore.so`JSC::Interpreter::executeProgram(JSC::SourceCode const&, JSC::ExecState*, JSC::JSObject*) + 10858
    frame #33: 0x00007f9496bb4d0c libWebCore.so`JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) + 316
    frame #34: 0x00007f9495221e86 libWebCore.so`WebCore::JSExecState::profiledEvaluate(JSC::ExecState*, JSC::ProfilingReason, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) + 86
    frame #35: 0x00007f9495221cde libWebCore.so`WebCore::ScriptController::evaluateInWorld(WebCore::ScriptSourceCode const&, WebCore::DOMWrapperWorld&, WebCore::ExceptionDetails*) + 206
    frame #36: 0x00007f94954390a4 libWebCore.so`WebCore::ScriptElement::executeClassicScript(WebCore::ScriptSourceCode const&) + 532
    frame #37: 0x00007f949540677c libWebCore.so`WebCore::LoadableClassicScript::execute(WebCore::ScriptElement&) + 124
    frame #38: 0x00007f9495439307 libWebCore.so`WebCore::ScriptElement::executeScriptAndDispatchEvent(WebCore::LoadableScript&) + 183
    frame #39: 0x00007f949543ec88 libWebCore.so`WebCore::ScriptRunner::timerFired() + 600
    frame #40: 0x00007f94958820d0 libWebCore.so`WebCore::ThreadTimers::sharedTimerFiredInternal() + 176
    frame #41: 0x00007f9496352ce9 libWebCore.so`WTF::RunLoop::iterateWithMaxDuration(WTF::Seconds) + 1737
    frame #42: 0x00007f94981b4cca libUltralight.so`ultralight::RendererImpl::Update() + 170
    frame #43: 0x00007f949819e1ff libUltralight.so`ulUpdate + 687
    frame #44: 0x00007f948f0fe81e 6e09833dea70173b.so`rt_f4(L=0x000055880b19f2b0) at rt-GBHUvR.c:59:9
    frame #45: 0x000055880969e328 lua`luaD_call(L=0x000055880b19f2b0, func=0x00005588113bde10, nresults=0) at ldo.c:482:11
    frame #46: 0x00005588096b1432 lua`luaV_execute(L=0x000055880b19f2b0, ci=<unavailable>) at lvm.c:1632:9
    frame #47: 0x000055880969e3ab lua`luaD_call(L=<unavailable>, func=<unavailable>, nresults=<unavailable>) at ldo.c:504:7 [artificial]
    frame #48: 0x000055880969e42c lua`luaD_callnoyield(L=0x000055880b19f2b0, func=0x00005588113bdd30, nResults=-1) at ldo.c:526:3
    frame #49: 0x000055880969d528 lua`luaD_rawrunprotected(L=0x000055880b19f2b0, f=(lua`f_call at lapi.c:997:26), ud=0x00007ffd04b87df8) at ldo.c:148:3
    frame #50: 0x000055880969e9ac lua`luaD_pcall(L=0x000055880b19f2b0, func=<unavailable>, u=0x00007ffd04b87df8, old_top=1232, ef=<unavailable>) at ldo.c:749:12
    frame #51: 0x000055880969a4cb lua`lua_pcallk(L=0x000055880b19f2b0, nargs=1, nresults=-1, errfunc=2, ctx=<unavailable>, k=<unavailable>) at lapi.c:1023:14
    frame #52: 0x00005588096bb4c5 lua`luaB_xpcall(L=0x000055880b19f2b0) at lbaselib.c:472:12
    frame #53: 0x000055880969e328 lua`luaD_call(L=0x000055880b19f2b0, func=0x00005588113bdcf0, nresults=2) at ldo.c:482:11
    frame #54: 0x00005588096b1432 lua`luaV_execute(L=0x000055880b19f2b0, ci=<unavailable>) at lvm.c:1632:9
    frame #55: 0x000055880969e3ab lua`luaD_call(L=<unavailable>, func=<unavailable>, nresults=<unavailable>) at ldo.c:504:7 [artificial]
    frame #56: 0x00005588096b1432 lua`luaV_execute(L=0x000055880b19f2b0, ci=<unavailable>) at lvm.c:1632:9
    frame #57: 0x000055880969e3ab lua`luaD_call(L=<unavailable>, func=<unavailable>, nresults=<unavailable>) at ldo.c:504:7 [artificial]
    frame #58: 0x00005588096b1432 lua`luaV_execute(L=0x000055880b19f2b0, ci=<unavailable>) at lvm.c:1632:9
    frame #59: 0x000055880969e3ab lua`luaD_call(L=<unavailable>, func=<unavailable>, nresults=<unavailable>) at ldo.c:504:7 [artificial]
    frame #60: 0x00005588096b1432 lua`luaV_execute(L=0x000055880b19f2b0, ci=<unavailable>) at lvm.c:1632:9
    frame #61: 0x000055880969e3ab lua`luaD_call(L=<unavailable>, func=<unavailable>, nresults=<unavailable>) at ldo.c:504:7 [artificial]
    frame #62: 0x00005588096b1432 lua`luaV_execute(L=0x000055880b19f2b0, ci=<unavailable>) at lvm.c:1632:9
    frame #63: 0x000055880969e3ab lua`luaD_call(L=<unavailable>, func=<unavailable>, nresults=<unavailable>) at ldo.c:504:7 [artificial]
    frame #64: 0x00005588096b1432 lua`luaV_execute(L=0x000055880b19f2b0, ci=<unavailable>) at lvm.c:1632:9
    frame #65: 0x000055880969e3ab lua`luaD_call(L=<unavailable>, func=<unavailable>, nresults=<unavailable>) at ldo.c:504:7 [artificial]
    frame #66: 0x00005588096b1432 lua`luaV_execute(L=0x000055880b19f2b0, ci=<unavailable>) at lvm.c:1632:9
    frame #67: 0x000055880969e3ab lua`luaD_call(L=<unavailable>, func=<unavailable>, nresults=<unavailable>) at ldo.c:504:7 [artificial]
    frame #68: 0x00005588096b1432 lua`luaV_execute(L=0x000055880b19f2b0, ci=<unavailable>) at lvm.c:1632:9
    frame #69: 0x000055880969e3ab lua`luaD_call(L=<unavailable>, func=<unavailable>, nresults=<unavailable>) at ldo.c:504:7 [artificial]
    frame #70: 0x00005588096b1432 lua`luaV_execute(L=0x000055880b19f2b0, ci=<unavailable>) at lvm.c:1632:9
    frame #71: 0x000055880969e3ab lua`luaD_call(L=<unavailable>, func=<unavailable>, nresults=<unavailable>) at ldo.c:504:7 [artificial]
    frame #72: 0x00005588096b1432 lua`luaV_execute(L=0x000055880b19f2b0, ci=<unavailable>) at lvm.c:1632:9
    frame #73: 0x000055880969e3ab lua`luaD_call(L=<unavailable>, func=<unavailable>, nresults=<unavailable>) at ldo.c:504:7 [artificial]
    frame #74: 0x00005588096b1432 lua`luaV_execute(L=0x000055880b19f2b0, ci=<unavailable>) at lvm.c:1632:9
    frame #75: 0x000055880969e3ab lua`luaD_call(L=<unavailable>, func=<unavailable>, nresults=<unavailable>) at ldo.c:504:7 [artificial]
    frame #76: 0x00005588096b1432 lua`luaV_execute(L=0x000055880b19f2b0, ci=<unavailable>) at lvm.c:1632:9
    frame #77: 0x000055880969e3ab lua`luaD_call(L=<unavailable>, func=<unavailable>, nresults=<unavailable>) at ldo.c:504:7 [artificial]
    frame #78: 0x000055880969e42c lua`luaD_callnoyield(L=0x000055880b19f2b0, func=0x000055880b19f960, nResults=-1) at ldo.c:526:3
    frame #79: 0x000055880969d528 lua`luaD_rawrunprotected(L=0x000055880b19f2b0, f=(lua`f_call at lapi.c:997:26), ud=0x00007ffd04b889e8) at ldo.c:148:3
    frame #80: 0x000055880969e9ac lua`luaD_pcall(L=0x000055880b19f2b0, func=<unavailable>, u=0x00007ffd04b889e8, old_top=80, ef=<unavailable>) at ldo.c:749:12
    frame #81: 0x000055880969a4cb lua`lua_pcallk(L=0x000055880b19f2b0, nargs=2, nresults=-1, errfunc=3, ctx=<unavailable>, k=0x0000000000000000) at lapi.c:1023:14
    frame #82: 0x0000558809696e4b lua`pmain [inlined] docall(L=0x000055880b19f2b0, narg=2, nres=-1) at lua.c:139:12
    frame #83: 0x0000558809696dee lua`pmain at lua.c:228:14
    frame #84: 0x0000558809696cff lua`pmain(L=0x000055880b19f2b0) at lua.c:603:7
    frame #85: 0x000055880969e328 lua`luaD_call(L=0x000055880b19f2b0, func=0x000055880b19f920, nresults=1) at ldo.c:482:11
    frame #86: 0x000055880969e42c lua`luaD_callnoyield(L=0x000055880b19f2b0, func=0x000055880b19f920, nResults=1) at ldo.c:526:3
    frame #87: 0x000055880969d528 lua`luaD_rawrunprotected(L=0x000055880b19f2b0, f=(lua`f_call at lapi.c:997:26), ud=0x00007ffd04b88c48) at ldo.c:148:3
    frame #88: 0x000055880969e9ac lua`luaD_pcall(L=0x000055880b19f2b0, func=<unavailable>, u=0x00007ffd04b88c48, old_top=16, ef=<unavailable>) at ldo.c:749:12
    frame #89: 0x000055880969a4cb lua`lua_pcallk(L=0x000055880b19f2b0, nargs=2, nresults=1, errfunc=0, ctx=<unavailable>, k=0x0000000000000000) at lapi.c:1023:14
    frame #90: 0x000055880969677b lua`main(argc=4, argv=0x00007ffd04b88db8) at lua.c:629:12
    frame #91: 0x00007f94990af290 libc.so.6`___lldb_unnamed_symbol3142 + 128
    frame #92: 0x00007f94990af34a libc.so.6`__libc_start_main + 138
    frame #93: 0x0000558809696645 lua`_start + 37
  thread #2, name = 'lua:disk$0'
    frame #0: 0x00007f949910f306 libc.so.6`___lldb_unnamed_symbol3470 + 198
    frame #1: 0x00007f9499111b20 libc.so.6`pthread_cond_wait + 496
    frame #2: 0x00007f944e2cd4dc libvulkan_intel.so`___lldb_unnamed_symbol6988 + 140
    frame #3: 0x00007f944e2cbebc libvulkan_intel.so`___lldb_unnamed_symbol6975 + 28
    frame #4: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #5: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #3, name = 'WSI swapchain q'
    frame #0: 0x00007f949910f306 libc.so.6`___lldb_unnamed_symbol3470 + 198
    frame #1: 0x00007f9499111e24 libc.so.6`pthread_cond_timedwait + 548
    frame #2: 0x00007f944e1ac778 libvulkan_intel.so`___lldb_unnamed_symbol5670 + 280
    frame #3: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #4: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #6, name = 'lua'
    frame #0: 0x00007f949910f306 libc.so.6`___lldb_unnamed_symbol3470 + 198
    frame #1: 0x00007f9499111b20 libc.so.6`pthread_cond_wait + 496
    frame #2: 0x00007f9497ecee81 libstdc++.so.6`std::condition_variable::wait(std::unique_lock<std::mutex>&) [inlined] __gthread_cond_wait(__mutex=<unavailable>, __cond=<unavailable>) at gthr-default.h:865:38
    frame #3: 0x00007f9497ecee78 libstdc++.so.6`std::condition_variable::wait(std::unique_lock<std::mutex>&) at std_mutex.h:155:23
    frame #4: 0x00007f9497ea41fe libstdc++.so.6`__gnu_cxx::__nothrow_wait_cv::wait(this=<unavailable>, lock=<unavailable>) at compatibility-condvar.cc:75:33
    frame #5: 0x00007f9498291bf2 libUltralightCore.so`ultralight::ThreadSafeQueue<std::unique_ptr<ultralight::ThreadPoolImpl::IThreadTask, std::default_delete<ultralight::ThreadPoolImpl::IThreadTask> > >::waitPop(std::unique_ptr<ultralight::ThreadPoolImpl::IThreadTask, std::default_delete<ultralight::ThreadPoolImpl::IThreadTask> >&) + 114
    frame #6: 0x00007f9498291b4b libUltralightCore.so`ultralight::ThreadPoolImpl::worker() + 59
    frame #7: 0x00007f9497ed62f3 libstdc++.so.6`execute_native_thread_routine at thread.cc:82:18
    frame #8: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #9: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #7, name = 'lua'
    frame #0: 0x00007f949910f306 libc.so.6`___lldb_unnamed_symbol3470 + 198
    frame #1: 0x00007f9499111b20 libc.so.6`pthread_cond_wait + 496
    frame #2: 0x00007f9497ecee81 libstdc++.so.6`std::condition_variable::wait(std::unique_lock<std::mutex>&) [inlined] __gthread_cond_wait(__mutex=<unavailable>, __cond=<unavailable>) at gthr-default.h:865:38
    frame #3: 0x00007f9497ecee78 libstdc++.so.6`std::condition_variable::wait(std::unique_lock<std::mutex>&) at std_mutex.h:155:23
    frame #4: 0x00007f9497ea41fe libstdc++.so.6`__gnu_cxx::__nothrow_wait_cv::wait(this=<unavailable>, lock=<unavailable>) at compatibility-condvar.cc:75:33
    frame #5: 0x00007f9498291bf2 libUltralightCore.so`ultralight::ThreadSafeQueue<std::unique_ptr<ultralight::ThreadPoolImpl::IThreadTask, std::default_delete<ultralight::ThreadPoolImpl::IThreadTask> > >::waitPop(std::unique_ptr<ultralight::ThreadPoolImpl::IThreadTask, std::default_delete<ultralight::ThreadPoolImpl::IThreadTask> >&) + 114
    frame #6: 0x00007f9498291b4b libUltralightCore.so`ultralight::ThreadPoolImpl::worker() + 59
    frame #7: 0x00007f9497ed62f3 libstdc++.so.6`execute_native_thread_routine at thread.cc:82:18
    frame #8: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #9: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #8, name = 'lua'
    frame #0: 0x00007f949910f306 libc.so.6`___lldb_unnamed_symbol3470 + 198
    frame #1: 0x00007f9499111b20 libc.so.6`pthread_cond_wait + 496
    frame #2: 0x00007f9497ecee81 libstdc++.so.6`std::condition_variable::wait(std::unique_lock<std::mutex>&) [inlined] __gthread_cond_wait(__mutex=<unavailable>, __cond=<unavailable>) at gthr-default.h:865:38
    frame #3: 0x00007f9497ecee78 libstdc++.so.6`std::condition_variable::wait(std::unique_lock<std::mutex>&) at std_mutex.h:155:23
    frame #4: 0x00007f9497ea41fe libstdc++.so.6`__gnu_cxx::__nothrow_wait_cv::wait(this=<unavailable>, lock=<unavailable>) at compatibility-condvar.cc:75:33
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    frame #3: 0x00007f94962fcfe4 libWebCore.so`WTF::ParkingLot::parkConditionallyImpl(void const*, WTF::ScopedLambda<bool ()> const&, WTF::ScopedLambda<void ()> const&, WTF::TimeWithDynamicClockType const&) + 2324
    frame #4: 0x00007f9494b0bf14 libWebCore.so`bool WTF::Condition::waitUntil<WTF::Lock>(WTF::Lock&, WTF::TimeWithDynamicClockType const&) + 164
    frame #5: 0x00007f9494b2d59f libWebCore.so`webKitWebSrcCreate(_GstPushSrc*, _GstBuffer**) + 527
    frame #6: 0x00007f949319fc62 libgstreamer-full-1.0.so`gst_base_src_get_range + 269
    frame #7: 0x00007f949319f854 libgstreamer-full-1.0.so`gst_base_src_loop + 839
    frame #8: 0x00007f9493173e66 libgstreamer-full-1.0.so`gst_task_func + 324
    frame #9: 0x00007f9492c6347b libglib-2.0.so.0`g_thread_pool_thread_proxy + 126
    frame #10: 0x00007f9492c626e1 libglib-2.0.so.0`g_thread_proxy + 58
    frame #11: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #12: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #28, name = 'source:src'
    frame #0: 0x00007f949910f306 libc.so.6`___lldb_unnamed_symbol3470 + 198
    frame #1: 0x00007f9499111e24 libc.so.6`pthread_cond_timedwait + 548
    frame #2: 0x00007f9496350af5 libWebCore.so`WTF::ThreadCondition::timedWait(WTF::Mutex&, WTF::WallTime) + 133
    frame #3: 0x00007f94962fcfe4 libWebCore.so`WTF::ParkingLot::parkConditionallyImpl(void const*, WTF::ScopedLambda<bool ()> const&, WTF::ScopedLambda<void ()> const&, WTF::TimeWithDynamicClockType const&) + 2324
    frame #4: 0x00007f9494b0bf14 libWebCore.so`bool WTF::Condition::waitUntil<WTF::Lock>(WTF::Lock&, WTF::TimeWithDynamicClockType const&) + 164
    frame #5: 0x00007f9494b2d59f libWebCore.so`webKitWebSrcCreate(_GstPushSrc*, _GstBuffer**) + 527
    frame #6: 0x00007f949319fc62 libgstreamer-full-1.0.so`gst_base_src_get_range + 269
    frame #7: 0x00007f949319f854 libgstreamer-full-1.0.so`gst_base_src_loop + 839
    frame #8: 0x00007f9493173e66 libgstreamer-full-1.0.so`gst_task_func + 324
    frame #9: 0x00007f9492c6347b libglib-2.0.so.0`g_thread_pool_thread_proxy + 126
    frame #10: 0x00007f9492c626e1 libglib-2.0.so.0`g_thread_proxy + 58
    frame #11: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #12: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #29, name = 'source:src'
    frame #0: 0x00007f949910f306 libc.so.6`___lldb_unnamed_symbol3470 + 198
    frame #1: 0x00007f9499111e24 libc.so.6`pthread_cond_timedwait + 548
    frame #2: 0x00007f9496350af5 libWebCore.so`WTF::ThreadCondition::timedWait(WTF::Mutex&, WTF::WallTime) + 133
    frame #3: 0x00007f94962fcfe4 libWebCore.so`WTF::ParkingLot::parkConditionallyImpl(void const*, WTF::ScopedLambda<bool ()> const&, WTF::ScopedLambda<void ()> const&, WTF::TimeWithDynamicClockType const&) + 2324
    frame #4: 0x00007f9494b0bf14 libWebCore.so`bool WTF::Condition::waitUntil<WTF::Lock>(WTF::Lock&, WTF::TimeWithDynamicClockType const&) + 164
    frame #5: 0x00007f9494b2d59f libWebCore.so`webKitWebSrcCreate(_GstPushSrc*, _GstBuffer**) + 527
    frame #6: 0x00007f949319fc62 libgstreamer-full-1.0.so`gst_base_src_get_range + 269
    frame #7: 0x00007f949319f854 libgstreamer-full-1.0.so`gst_base_src_loop + 839
    frame #8: 0x00007f9493173e66 libgstreamer-full-1.0.so`gst_task_func + 324
    frame #9: 0x00007f9492c6347b libglib-2.0.so.0`g_thread_pool_thread_proxy + 126
    frame #10: 0x00007f9492c626e1 libglib-2.0.so.0`g_thread_proxy + 58
    frame #11: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #12: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #30, name = 'source:src'
    frame #0: 0x00007f949910f306 libc.so.6`___lldb_unnamed_symbol3470 + 198
    frame #1: 0x00007f9499111e24 libc.so.6`pthread_cond_timedwait + 548
    frame #2: 0x00007f9496350af5 libWebCore.so`WTF::ThreadCondition::timedWait(WTF::Mutex&, WTF::WallTime) + 133
    frame #3: 0x00007f94962fcfe4 libWebCore.so`WTF::ParkingLot::parkConditionallyImpl(void const*, WTF::ScopedLambda<bool ()> const&, WTF::ScopedLambda<void ()> const&, WTF::TimeWithDynamicClockType const&) + 2324
    frame #4: 0x00007f9494b0bf14 libWebCore.so`bool WTF::Condition::waitUntil<WTF::Lock>(WTF::Lock&, WTF::TimeWithDynamicClockType const&) + 164
    frame #5: 0x00007f9494b2d59f libWebCore.so`webKitWebSrcCreate(_GstPushSrc*, _GstBuffer**) + 527
    frame #6: 0x00007f949319fc62 libgstreamer-full-1.0.so`gst_base_src_get_range + 269
    frame #7: 0x00007f949319f854 libgstreamer-full-1.0.so`gst_base_src_loop + 839
    frame #8: 0x00007f9493173e66 libgstreamer-full-1.0.so`gst_task_func + 324
    frame #9: 0x00007f9492c6347b libglib-2.0.so.0`g_thread_pool_thread_proxy + 126
    frame #10: 0x00007f9492c626e1 libglib-2.0.so.0`g_thread_proxy + 58
    frame #11: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #12: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #31, name = 'typefind:sink'
    frame #0: 0x00007f949918c59d libc.so.6`syscall + 29
    frame #1: 0x00007f9492c7fb5a libglib-2.0.so.0`g_cond_wait + 50
    frame #2: 0x00007f9493173e38 libgstreamer-full-1.0.so`gst_task_func + 278
    frame #3: 0x00007f9492c6347b libglib-2.0.so.0`g_thread_pool_thread_proxy + 126
    frame #4: 0x00007f9492c626e1 libglib-2.0.so.0`g_thread_proxy + 58
    frame #5: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #6: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #32, name = 'typefind:sink'
    frame #0: 0x00007f949918c59d libc.so.6`syscall + 29
    frame #1: 0x00007f9492c7fb5a libglib-2.0.so.0`g_cond_wait + 50
    frame #2: 0x00007f9493173e38 libgstreamer-full-1.0.so`gst_task_func + 278
    frame #3: 0x00007f9492c6347b libglib-2.0.so.0`g_thread_pool_thread_proxy + 126
    frame #4: 0x00007f9492c626e1 libglib-2.0.so.0`g_thread_proxy + 58
    frame #5: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #6: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #33, name = 'matroskademux1:'
    frame #0: 0x00007f949918c59d libc.so.6`syscall + 29
    frame #1: 0x00007f9492c7fb5a libglib-2.0.so.0`g_cond_wait + 50
    frame #2: 0x00007f94931a3494 libgstreamer-full-1.0.so`gst_data_queue_push + 156
    frame #3: 0x00007f9493136482 libgstreamer-full-1.0.so`gst_multi_queue_chain + 352
    frame #4: 0x00007f9493162de9 libgstreamer-full-1.0.so`gst_pad_chain_data_unchecked + 163
    frame #5: 0x00007f94931632c0 libgstreamer-full-1.0.so`gst_pad_push_data + 210
    frame #6: 0x00007f949316315b libgstreamer-full-1.0.so`gst_pad_push + 165
    frame #7: 0x00007f94933adf89 libgstreamer-full-1.0.so`gst_matroska_demux_parse_blockgroup_or_simpleblock + 6618
    frame #8: 0x00007f94933ab25c libgstreamer-full-1.0.so`gst_matroska_demux_parse_id + 769
    frame #9: 0x00007f94933aa811 libgstreamer-full-1.0.so`gst_matroska_demux_loop + 128
    frame #10: 0x00007f9493173e66 libgstreamer-full-1.0.so`gst_task_func + 324
    frame #11: 0x00007f9492c6347b libglib-2.0.so.0`g_thread_pool_thread_proxy + 126
    frame #12: 0x00007f9492c626e1 libglib-2.0.so.0`g_thread_proxy + 58
    frame #13: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #14: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
* thread #34, name = 'matroskademux0:', stop reason = signal SIGSEGV: address access protected (fault address: 0x7f93800630c0)
  * frame #0: 0x00007f94991dfbd7 libc.so.6`___lldb_unnamed_symbol4335 + 1047
    frame #1: 0x00007f949313d45b libgstreamer-full-1.0.so`gst_queue2_create_read + 784
    frame #2: 0x00007f949313b44f libgstreamer-full-1.0.so`gst_queue2_get_range + 122
    frame #3: 0x00007f9493163762 libgstreamer-full-1.0.so`gst_pad_get_range_unchecked + 201
    frame #4: 0x00007f9493163b1f libgstreamer-full-1.0.so`gst_pad_pull_range + 289
    frame #5: 0x00007f949315ae6a libgstreamer-full-1.0.so`gst_proxy_pad_getrange_default + 46
    frame #6: 0x00007f9493163762 libgstreamer-full-1.0.so`gst_pad_get_range_unchecked + 201
    frame #7: 0x00007f9493163b1f libgstreamer-full-1.0.so`gst_pad_pull_range + 289
    frame #8: 0x00007f9493163762 libgstreamer-full-1.0.so`gst_pad_get_range_unchecked + 201
    frame #9: 0x00007f9493163b1f libgstreamer-full-1.0.so`gst_pad_pull_range + 289
    frame #10: 0x00007f94933aad64 libgstreamer-full-1.0.so`gst_matroska_demux_search_cluster + 311
    frame #11: 0x00007f94933aa8b0 libgstreamer-full-1.0.so`gst_matroska_demux_loop + 287
    frame #12: 0x00007f9493173e66 libgstreamer-full-1.0.so`gst_task_func + 324
    frame #13: 0x00007f9492c6347b libglib-2.0.so.0`g_thread_pool_thread_proxy + 126
    frame #14: 0x00007f9492c626e1 libglib-2.0.so.0`g_thread_proxy + 58
    frame #15: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #16: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #35, name = 'multiqueue0:src'
    frame #0: 0x00007f949918c59d libc.so.6`syscall + 29
    frame #1: 0x00007f9492c7fb5a libglib-2.0.so.0`g_cond_wait + 50
    frame #2: 0x00007f949313f0f0 libgstreamer-full-1.0.so`gst_queue_chain_buffer_or_list + 302
    frame #3: 0x00007f9493162de9 libgstreamer-full-1.0.so`gst_pad_chain_data_unchecked + 163
    frame #4: 0x00007f94931632c0 libgstreamer-full-1.0.so`gst_pad_push_data + 210
    frame #5: 0x00007f949316315b libgstreamer-full-1.0.so`gst_pad_push + 165
    frame #6: 0x00007f94931a2d59 libgstreamer-full-1.0.so`gst_base_transform_chain + 329
    frame #7: 0x00007f9493162de9 libgstreamer-full-1.0.so`gst_pad_chain_data_unchecked + 163
    frame #8: 0x00007f94931632c0 libgstreamer-full-1.0.so`gst_pad_push_data + 210
    frame #9: 0x00007f949316315b libgstreamer-full-1.0.so`gst_pad_push + 165
    frame #10: 0x00007f94931a2d59 libgstreamer-full-1.0.so`gst_base_transform_chain + 329
    frame #11: 0x00007f9493162de9 libgstreamer-full-1.0.so`gst_pad_chain_data_unchecked + 163
    frame #12: 0x00007f94931632c0 libgstreamer-full-1.0.so`gst_pad_push_data + 210
    frame #13: 0x00007f949316315b libgstreamer-full-1.0.so`gst_pad_push + 165
    frame #14: 0x00007f949315adf1 libgstreamer-full-1.0.so`gst_proxy_pad_chain_default + 31
    frame #15: 0x00007f9493162de9 libgstreamer-full-1.0.so`gst_pad_chain_data_unchecked + 163
    frame #16: 0x00007f94931632c0 libgstreamer-full-1.0.so`gst_pad_push_data + 210
    frame #17: 0x00007f949316315b libgstreamer-full-1.0.so`gst_pad_push + 165
    frame #18: 0x00007f949315adf1 libgstreamer-full-1.0.so`gst_proxy_pad_chain_default + 31
    frame #19: 0x00007f9493162de9 libgstreamer-full-1.0.so`gst_pad_chain_data_unchecked + 163
    frame #20: 0x00007f94931632c0 libgstreamer-full-1.0.so`gst_pad_push_data + 210
    frame #21: 0x00007f949316315b libgstreamer-full-1.0.so`gst_pad_push + 165
    frame #22: 0x00007f9493162de9 libgstreamer-full-1.0.so`gst_pad_chain_data_unchecked + 163
    frame #23: 0x00007f94931632c0 libgstreamer-full-1.0.so`gst_pad_push_data + 210
    frame #24: 0x00007f949316315b libgstreamer-full-1.0.so`gst_pad_push + 165
    frame #25: 0x00007f94931a2d59 libgstreamer-full-1.0.so`gst_base_transform_chain + 329
    frame #26: 0x00007f9493162de9 libgstreamer-full-1.0.so`gst_pad_chain_data_unchecked + 163
    frame #27: 0x00007f94931632c0 libgstreamer-full-1.0.so`gst_pad_push_data + 210
    frame #28: 0x00007f949316315b libgstreamer-full-1.0.so`gst_pad_push + 165
    frame #29: 0x00007f949315adf1 libgstreamer-full-1.0.so`gst_proxy_pad_chain_default + 31
    frame #30: 0x00007f9493162de9 libgstreamer-full-1.0.so`gst_pad_chain_data_unchecked + 163
    frame #31: 0x00007f94931632c0 libgstreamer-full-1.0.so`gst_pad_push_data + 210
    frame #32: 0x00007f949316315b libgstreamer-full-1.0.so`gst_pad_push + 165
    frame #33: 0x00007f94932727c4 libgstreamer-full-1.0.so`gst_stream_synchronizer_sink_chain + 187
    frame #34: 0x00007f9493162de9 libgstreamer-full-1.0.so`gst_pad_chain_data_unchecked + 163
    frame #35: 0x00007f94931632c0 libgstreamer-full-1.0.so`gst_pad_push_data + 210
    frame #36: 0x00007f949316315b libgstreamer-full-1.0.so`gst_pad_push + 165
    frame #37: 0x00007f949315adf1 libgstreamer-full-1.0.so`gst_proxy_pad_chain_default + 31
    frame #38: 0x00007f9493162de9 libgstreamer-full-1.0.so`gst_pad_chain_data_unchecked + 163
    frame #39: 0x00007f94931632c0 libgstreamer-full-1.0.so`gst_pad_push_data + 210
    frame #40: 0x00007f949316315b libgstreamer-full-1.0.so`gst_pad_push + 165
    frame #41: 0x00007f9493133917 libgstreamer-full-1.0.so`gst_selector_pad_chain + 1303
    frame #42: 0x00007f9493162de9 libgstreamer-full-1.0.so`gst_pad_chain_data_unchecked + 163
    frame #43: 0x00007f94931632c0 libgstreamer-full-1.0.so`gst_pad_push_data + 210
    frame #44: 0x00007f949316315b libgstreamer-full-1.0.so`gst_pad_push + 165
    frame #45: 0x00007f949315adf1 libgstreamer-full-1.0.so`gst_proxy_pad_chain_default + 31
    frame #46: 0x00007f9493162de9 libgstreamer-full-1.0.so`gst_pad_chain_data_unchecked + 163
    frame #47: 0x00007f94931632c0 libgstreamer-full-1.0.so`gst_pad_push_data + 210
    frame #48: 0x00007f949316315b libgstreamer-full-1.0.so`gst_pad_push + 165
    frame #49: 0x00007f949315adf1 libgstreamer-full-1.0.so`gst_proxy_pad_chain_default + 31
    frame #50: 0x00007f9493162de9 libgstreamer-full-1.0.so`gst_pad_chain_data_unchecked + 163
    frame #51: 0x00007f94931632c0 libgstreamer-full-1.0.so`gst_pad_push_data + 210
    frame #52: 0x00007f949316315b libgstreamer-full-1.0.so`gst_pad_push + 165
    frame #53: 0x00007f94938b6996 libgstreamer-full-1.0.so`gst_video_decoder_clip_and_push_buf + 381
    frame #54: 0x00007f94938b6677 libgstreamer-full-1.0.so`gst_video_decoder_finish_frame + 594
    frame #55: 0x00007f949365788e libgstreamer-full-1.0.so`gst_ffmpegviddec_frame + 2906
    frame #56: 0x00007f9493655f3c libgstreamer-full-1.0.so`gst_ffmpegviddec_handle_frame + 590
    frame #57: 0x00007f94938b9eaf libgstreamer-full-1.0.so`gst_video_decoder_chain_forward + 350
    frame #58: 0x00007f94938ba163 libgstreamer-full-1.0.so`gst_video_decoder_chain + 172
    frame #59: 0x00007f9493162de9 libgstreamer-full-1.0.so`gst_pad_chain_data_unchecked + 163
    frame #60: 0x00007f94931632c0 libgstreamer-full-1.0.so`gst_pad_push_data + 210
    frame #61: 0x00007f949316315b libgstreamer-full-1.0.so`gst_pad_push + 165
    frame #62: 0x00007f9493137883 libgstreamer-full-1.0.so`gst_multi_queue_loop + 958
    frame #63: 0x00007f9493173e66 libgstreamer-full-1.0.so`gst_task_func + 324
    frame #64: 0x00007f9492c6347b libglib-2.0.so.0`g_thread_pool_thread_proxy + 126
    frame #65: 0x00007f9492c626e1 libglib-2.0.so.0`g_thread_proxy + 58
    frame #66: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #67: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #36, name = 'matroskademux1:'
    frame #0: 0x00007f949910f306 libc.so.6`___lldb_unnamed_symbol3470 + 198
    frame #1: 0x00007f9499111b20 libc.so.6`pthread_cond_wait + 496
    frame #2: 0x00007f94936e0e66 libgstreamer-full-1.0.so`frame_worker_thread + 582
    frame #3: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #4: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #37, name = 'matroskademux1:'
    frame #0: 0x00007f949910f306 libc.so.6`___lldb_unnamed_symbol3470 + 198
    frame #1: 0x00007f9499111b20 libc.so.6`pthread_cond_wait + 496
    frame #2: 0x00007f94936e0e66 libgstreamer-full-1.0.so`frame_worker_thread + 582
    frame #3: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #4: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #38, name = 'matroskademux1:'
    frame #0: 0x00007f949910f306 libc.so.6`___lldb_unnamed_symbol3470 + 198
    frame #1: 0x00007f9499111b20 libc.so.6`pthread_cond_wait + 496
    frame #2: 0x00007f94936e0e66 libgstreamer-full-1.0.so`frame_worker_thread + 582
    frame #3: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #4: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #39, name = 'matroskademux1:'
    frame #0: 0x00007f949910f306 libc.so.6`___lldb_unnamed_symbol3470 + 198
    frame #1: 0x00007f9499111b20 libc.so.6`pthread_cond_wait + 496
    frame #2: 0x00007f94936e0e66 libgstreamer-full-1.0.so`frame_worker_thread + 582
    frame #3: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #4: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #40, name = 'matroskademux1:'
    frame #0: 0x00007f949910f306 libc.so.6`___lldb_unnamed_symbol3470 + 198
    frame #1: 0x00007f9499111b20 libc.so.6`pthread_cond_wait + 496
    frame #2: 0x00007f94936e0e66 libgstreamer-full-1.0.so`frame_worker_thread + 582
    frame #3: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #4: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #41, name = 'matroskademux1:'
    frame #0: 0x00007f949910f306 libc.so.6`___lldb_unnamed_symbol3470 + 198
    frame #1: 0x00007f9499111b20 libc.so.6`pthread_cond_wait + 496
    frame #2: 0x00007f94936e0e66 libgstreamer-full-1.0.so`frame_worker_thread + 582
    frame #3: 0x00007f949911274d libc.so.6`___lldb_unnamed_symbol3500 + 717
    frame #4: 0x00007f9499194700 libc.so.6`___lldb_unnamed_symbol3926 + 11
  thread #42, name = 'matroskademux1:'
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    frame #1: 0x00007f9499111b20 libc.so.6`pthread_cond_wait + 496
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  thread #120, name = 'multiqueue8:src'
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[lukexi]

(I'm on Arch Linux with an up-to-date pacman -Syu and the latest release of Ultralight)