217363 2020-10-05 21:35:49 -0700 REGRESSION(r267763): [GTK][WPE] Broken main thread assertion in MemoryPressureMonitor 2021-02-04 00:48:14 -0800 1 1 1 Unclassified WebKit WebKit Misc. WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 lmoura lmoura aboya bugs-noreply cgarcia clopez webkit-bug-importer oldest_to_newest 1695022 0 410609 lmoura 2020-10-05 21:35:49 -0700 Created attachment 410609 js/throw-large-string-oom.html trace Some tests affected: imported/w3c/web-platform-tests/xhr/sync-no-timeout.any.html js/throw-large-string-oom.html (all the time, running ~10 iterations to reproduce locally) scrollbars/scrollbar-selectors.html (only once) Sample trace (full attached): Thread 1 (Thread 0x7fa8ba7ff700 (LWP 29320)): #0 0x00007fa8cac8e9ab in WTFCrash () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18 #1 0x0000000000428bba in () #2 0x00007fa8cd3b6ea5 in _ZN6WebKit19NetworkProcessProxy19allNetworkProcessesEv () at /app/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37 #3 0x00007fa8cd2b657a in _ZN6WebKit14WebProcessPool23sendMemoryPressureEventEb () at /app/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37 #4 0x00007fa8cd40c483 in _ZZN6WebKit21MemoryPressureMonitor5startEvENK3$_7clEv () at /app/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37 #5 0x00007fa8cd40bc76 in () at /app/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37 #6 0x00007fa8caca9570 in _ZN3WTF6Thread10entryPointEPNS0_16NewThreadContextE () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18 #7 0x00007fa8cad04026 in _ZN3WTFL19wtfThreadEntryPointEPv () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18 #8 0x00007fa8c783f4d2 in start_thread (arg=<optimized out>) at pthread_create.c:477 #9 0x00007fa8c53a34d3 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 It's asserting the isMain() check in NetworkProcessProxy.cpp networkProcessesSet(), added by r267763 (line 89 in https://trac.webkit.org/changeset/267763/webkit#file47). 1700920 1 clopez 2020-10-22 20:38:18 -0700 This test is also crashing in more bots than in gtk-release-wayland bot. And it also times out sometimes. This is a summary of what happened on the bots recently: gtk-release: crashed 171 times on the last 4000 runs gtk-debug: crashed 1 times and timed out 296 times on the last 4000 runs wpe-release crashed 97 times and timed out 11 times on the last 4000 runs wpe-debug: timed out 330 times on the last 4000 runs 1700923 2 clopez 2020-10-22 20:50:01 -0700 (In reply to Carlos Alberto Lopez Perez from comment #1) > This test is also crashing in more bots than in gtk-release-wayland bot. > > And it also times out sometimes. > > This is a summary of what happened on the bots recently: > > gtk-release: crashed 171 times on the last 4000 runs > gtk-debug: crashed 1 times and timed out 296 times on the last 4000 runs > wpe-release crashed 97 times and timed out 11 times on the last 4000 runs > wpe-debug: timed out 330 times on the last 4000 runs With "this test" I wanted to mean here the test js/throw-large-string-oom.html For the other 2 I no longer see them crashing. Updated expectations on r268903 1713547 3 aboya 2020-12-10 08:14:53 -0800 I have reproduced this in the minibrowser as well. I was attaching gdb to the WebProcess in a computer with very limited RAM. This caused enough RAM to be used to trigger the memory pressure handler in the MiniBrowser, and it crashed there. Here is the backtrace, same as reported before, but resolving the pointers: ASSERTION FAILED: RunLoop::isMain() #0 WTFCrash() () at ../../Source/WTF/wtf/Assertions.cpp:295 #1 0x00007f6bdd2309b7 in CRASH_WITH_INFO(...) () at DerivedSources/ForwardingHeaders/wtf/Assertions.h:713 #2 0x00007f6bde1df52c in WebKit::networkProcessesSet() () at ../../Source/WebKit/UIProcess/Network/NetworkProcessProxy.cpp:90 #3 0x00007f6bde1df5ad in WebKit::NetworkProcessProxy::allNetworkProcesses() () at ../../Source/WebKit/UIProcess/Network/NetworkProcessProxy.cpp:98 #4 0x00007f6bdde8063a in WebKit::WebProcessPool::sendMemoryPressureEvent(bool) (this=0x7f6bc44d6000, isCritical=false) at ../../Source/WebKit/UIProcess/WebProcessPool.cpp:443 #5 0x00007f6bde2d4e53 in operator()() const (__closure=0x7f6bc44fa6a8) at ../../Source/WebKit/UIProcess/linux/MemoryPressureMonitor.cpp:383 #6 0x00007f6bde2d60a6 in WTF::Detail::CallableWrapper<WebKit::MemoryPressureMonitor::start()::<lambda()>, void>::call(void) (this=0x7f6bc44fa6a0) at DerivedSources/ForwardingHeaders/wtf/Function.h:52 #7 0x00007f6bdd233fd3 in WTF::Function<void ()>::operator()() const (this=0x7f6b7dbfac30) at DerivedSources/ForwardingHeaders/wtf/Function.h:83 #8 0x00007f6bce715839 in WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) (newThreadContext=0x7f6bc44eb410) at ../../Source/WTF/wtf/Threading.cpp:179 #9 0x00007f6bce7a6191 in WTF::wtfThreadEntryPoint(void*) (context=0x7f6bc44eb410) at ../../Source/WTF/wtf/posix/ThreadingPOSIX.cpp:213 #10 0x00007f6bc87674d2 in start_thread (arg=<optimized out>) at pthread_create.c:477 #11 0x00007f6bc64852a3 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Note this is the code that starts and runs the MemoryPressureMonitor, very clearly on its own thread. void MemoryPressureMonitor::start() { if (m_started) return; m_started = true; Thread::create("MemoryPressureMonitor", [] { [...] while (true) { [...] if (usedPercentage >= s_memoryPresurePercentageThreshold) { [...] for (auto* processPool : WebProcessPool::allProcessPools()) processPool->sendMemoryPressureEvent([...]); Then WebProcessPool::sendMemoryPressureEvent() needs to traverse allNetworkProcesses() void WebProcessPool::sendMemoryPressureEvent([...]) { [...] for (auto networkProcess : NetworkProcessProxy::allNetworkProcesses()) But networkProcessesSet() assumes it will only ever be used in the main thread, which is not the case here. static HashSet<NetworkProcessProxy*>& networkProcessesSet() { ASSERT(RunLoop::isMain()); static NeverDestroyed<HashSet<NetworkProcessProxy*>> set; return set; } 1725454 4 419219 lmoura 2021-02-03 19:42:15 -0800 Created attachment 419219 Patch 1725546 5 ews-feeder 2021-02-04 00:47:39 -0800 Committed r272362: <https://trac.webkit.org/changeset/272362> All reviewed patches have been landed. Closing bug and clearing flags on attachment 419219. 1725548 6 webkit-bug-importer 2021-02-04 00:48:14 -0800 <rdar://problem/73970229> 410609 2020-10-05 21:35:49 -0700 2020-10-05 21:35:49 -0700 js/throw-large-string-oom.html trace throw-large-string-oom-crash-log.txt text/plain 16406 lmoura Y3Jhc2ggbG9nIGZvciBXZWJLaXRUZXN0UnVubmVyIChwaWQgMjkyNzQpOgoKRVJST1I6IFRoZSBn ZGIgcHJvY2VzcyBleGl0ZWQgd2l0aCBub24temVybyByZXR1cm4gY29kZSBOb25lCgpbTmV3IExX UCAyOTMyMF0KW05ldyBMV1AgMjkzMjJdCltOZXcgTFdQIDYzMDFdCltOZXcgTFdQIDI5Mjc0XQpb TmV3IExXUCAyOTI4NV0KW05ldyBMV1AgMjkzMTJdCltOZXcgTFdQIDI5MzE0XQpbTmV3IExXUCAy OTMyMV0KW05ldyBMV1AgMjkzMTVdCltOZXcgTFdQIDI5Mjg2XQpbTmV3IExXUCAyOTMxNl0KW05l dyBMV1AgMjkzMDhdCltOZXcgTFdQIDI5MzI0XQpbVGhyZWFkIGRlYnVnZ2luZyB1c2luZyBsaWJ0 aHJlYWRfZGIgZW5hYmxlZF0KVXNpbmcgaG9zdCBsaWJ0aHJlYWRfZGIgbGlicmFyeSAiL3Vzci9s aWIveDg2XzY0LWxpbnV4LWdudS9saWJ0aHJlYWRfZGIuc28uMSIuCkNvcmUgd2FzIGdlbmVyYXRl ZCBieSBgL2FwcC93ZWJraXQvV2ViS2l0QnVpbGQvUmVsZWFzZS9iaW4vV2ViS2l0VGVzdFJ1bm5l 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