Hello. I have a program that uses the webkit engine (gtk+ port) for intense-rendering. I have about 10 threads, each with it's own webkit instance. While there's no problem when only two instances are active. But when I increase the instances, the program segfaults. I got the following backtrace from gdb: =================================================================== Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0xb56f6720 (LWP 20719)] 0xb7d852dc in JSC::Heap::heapAllocate<(JSC::Heap::HeapType)0> () from /usr/lib/libwebkit-1.0.so.1 Current language: auto; currently asm (gdb) bt #0 0xb7d852dc in JSC::Heap::heapAllocate<(JSC::Heap::HeapType)0> () from /usr/lib/libwebkit-1.0.so.1 #1 0xb7b87822 in WebCore::JSHTMLImageElement::createPrototype () from /usr/lib/libwebkit-1.0.so.1 #2 0xb7b72d6f in WebCore::createImageWrapper () from /usr/lib/libwebkit-1.0.so.1 #3 0xb7b75552 in WebCore::createJSHTMLWrapper () from /usr/lib/libwebkit-1.0.so.1 #4 0xb7657332 in WebCore::toJS () from /usr/lib/libwebkit-1.0.so.1 #5 0xb765124a in WebCore::constructImage () from /usr/lib/libwebkit-1.0.so.1 #6 0xb7cb1b0d in JSC::Machine::privateExecute () from /usr/lib/libwebkit-1.0.so.1 #7 0xb7cb8ed7 in JSC::Machine::execute () from /usr/lib/libwebkit-1.0.so.1 #8 0xb7d7ebee in JSC::Interpreter::evaluate () from /usr/lib/libwebkit-1.0.so.1 #9 0xb7660310 in WebCore::ScriptController::evaluate () from /usr/lib/libwebkit-1.0.so.1 #10 0xb784256c in WebCore::FrameLoader::executeScript () from /usr/lib/libwebkit-1.0.so.1 #11 0xb7801702 in WebCore::HTMLTokenizer::scriptExecution () from /usr/lib/libwebkit-1.0.so.1 #12 0xb7802919 in WebCore::HTMLTokenizer::scriptHandler () from /usr/lib/libwebkit-1.0.so.1 #13 0xb780337a in WebCore::HTMLTokenizer::parseSpecial () from /usr/lib/libwebkit-1.0.so.1 #14 0xb7805661 in WebCore::HTMLTokenizer::parseTag () from /usr/lib/libwebkit-1.0.so.1 #15 0xb78080c7 in WebCore::HTMLTokenizer::write () from /usr/lib/libwebkit-1.0.so.1 #16 0xb782d919 in WebCore::FrameLoader::write () from /usr/lib/libwebkit-1.0.so.1 #17 0xb782ddd7 in WebCore::FrameLoader::addData () from /usr/lib/libwebkit-1.0.so.1 #18 0xb7620415 in WebKit::FrameLoaderClient::committedLoad () from /usr/lib/libwebkit-1.0.so.1 #19 0xb7829a77 in WebCore::FrameLoader::committedLoad () from /usr/lib/libwebkit-1.0.so.1 #20 0xb781b40c in WebCore::DocumentLoader::commitLoad () from /usr/lib/libwebkit-1.0.so.1 #21 0xb7829e73 in WebCore::FrameLoader::receivedData () from /usr/lib/libwebkit-1.0.so.1 #22 0xb7847d46 in WebCore::MainResourceLoader::addData () from /usr/lib/libwebkit-1.0.so.1 #23 0xb784eb12 in WebCore::ResourceLoader::didReceiveData () from /usr/lib/libwebkit-1.0.so.1 #24 0xb7847e9d in WebCore::MainResourceLoader::didReceiveData () from /usr/lib/libwebkit-1.0.so.1 #25 0xb784e7f8 in WebCore::ResourceLoader::didReceiveData () from /usr/lib/libwebkit-1.0.so.1 #26 0xb79cbec4 in WebCore::writeCallback () from /usr/lib/libwebkit-1.0.so.1 #27 0xb6b97285 in ?? () from /usr/lib/libcurl-gnutls.so.4 #28 0xb6b8cd02 in ?? () from /usr/lib/libcurl-gnutls.so.4 #29 0xb6ba0b70 in ?? () from /usr/lib/libcurl-gnutls.so.4 #30 0xb6bb088d in ?? () from /usr/lib/libcurl-gnutls.so.4 #31 0xb6bb0bd9 in curl_multi_perform () from /usr/lib/libcurl-gnutls.so.4 #32 0xb79ccc58 in WebCore::ResourceHandleManager::downloadTimerCallback () from /usr/lib/libwebkit-1.0.so.1 #33 0xb79cdbbb in WebCore::Timer<WebCore::ResourceHandleManager>::fired () from /usr/lib/libwebkit-1.0.so.1 #34 0xb78d622b in WebCore::TimerBase::fireTimers () from /usr/lib/libwebkit-1.0.so.1 ---Type <return> to continue, or q <return> to quit--- #35 0xb78d6577 in WebCore::TimerBase::sharedTimerFired () from /usr/lib/libwebkit-1.0.so.1 #36 0xb7afc44e in WebCore::timeout_cb () from /usr/lib/libwebkit-1.0.so.1 #37 0xb6defe26 in ?? () from /usr/lib/libglib-2.0.so.0 #38 0xb6def6f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0 #39 0xb6df2da3 in ?? () from /usr/lib/libglib-2.0.so.0 #40 0xb6df32c2 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0 #41 0xb72cc299 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0 #42 0x0804ab13 in main (argc=2, argv=0xbf9ea774) at main.c:123 ===================================================================
I've disabled updating to gtk+ and even make a gdk_threads_enter()/_leave() when opening pages. Do I have to protect the webkit instance with other functions? It seems the memory management of webkit fails. Please help. Greets, Luka
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