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Details

Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: 5.12.2, 5.13.0, 5.15.4
Affects Version/s: 5.12
Component/s: WebEngine
Labels:
None

Platform/s:

Linux/X11, macOS
Epic Link:
WebEngine: CI and Autotests
Commits:
5ac98b606c1c297b34887f5d6bd51c8dda515f65 (qt/qtwebengine/5.12)

Description

Failed build example:

https://testresults.qt.io/coin/integration/qt/qtwebengine/tasks/1543928633

According to grafana it fails almost since the beging like this:

agent:2018/11/06 11:17:28 build.go:193: FAIL! : tst_QWebEnginePage::dynamicFrame() Compared values are not the same agent:2018/11/06 11:17:28 build.go:193: Actual (toPlainTextSync(&page).trimmed()): "" agent:2018/11/06 11:17:28 build.go:193: Expected (QStringLiteral("foo")) : "foo" agent:2018/11/06 11:17:28 build.go:193: Loc: [tst_qwebenginepage.cpp(4484)]

Running test with verbose logging reveals that sometimes additional garbage collection is triggered and iframe is just deleted leaving page content basically empty:

********* Start testing of tst_QWebEnginePage *********
Config: Using QtTest library 5.12.0, Qt 5.12.0 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 8.2.1 20181127)
PASS   : tst_QWebEnginePage::initTestCase()
[1720:1720:0107/112649.238258:INFO:cpu_info.cc(46)] Available number of cores: 8
[1720:1720:0107/112649.238650:VERBOSE1:zygote_main_linux.cc(217)] ZygoteMain: initializing 0 fork delegates
[1715:1715:0107/112649.299923:VERBOSE1:webrtc_internals.cc(125)] Could not get the download directory.
[1738:1738:0107/112649.407276:VERBOSE2:thread_state.cc(621)] [state:0x7f5d32a3f000] ScheduleGCIfNeeded
[1738:1738:0107/112649.407364:VERBOSE2:thread_state.cc(621)] [state:0x7f5d32a3f000] ScheduleGCIfNeeded
[1738:1738:0107/112649.408328:VERBOSE2:thread_state.cc(621)] [state:0x7f5d32a3f000] ScheduleGCIfNeeded
[1738:1738:0107/112649.408415:VERBOSE2:thread_state.cc(621)] [state:0x7f5d32a3f000] ScheduleGCIfNeeded
[1738:1738:0107/112649.408466:VERBOSE2:thread_state.cc(621)] [state:0x7f5d32a3f000] ScheduleGCIfNeeded
[1738:1738:0107/112649.408524:VERBOSE2:thread_state.cc(621)] [state:0x7f5d32a3f000] ScheduleGCIfNeeded
[1738:1738:0107/112649.409410:VERBOSE2:thread_state.cc(621)] [state:0x7f5d32a3f000] ScheduleGCIfNeeded
[1738:1738:0107/112649.409887:VERBOSE2:thread_state.cc(621)] [state:0x7f5d32a3f000] ScheduleGCIfNeeded
[1738:1738:0107/112649.410078:VERBOSE2:thread_state.cc(621)] [state:0x7f5d32a3f000] ScheduleGCIfNeeded
[1715:1725:0107/112649.410618:VERBOSE1:network_delegate.cc(32)] NetworkDelegate::NotifyBeforeURLRequest: qrc:/resources/dynamicFrame.html
[1715:1731:0107/112649.416590:VERBOSE1:gles2_cmd_decoder.cc(3598)] GL_EXT_packed_depth_stencil supported.
[1738:1738:0107/112649.428277:VERBOSE2:thread_state.cc(578)] [state:0x7f5d32a3f000] SchedulePageNavigationGCIfNeeded: estimatedRemovalRatio=0.75
[1738:1738:0107/112649.428810:VERBOSE2:thread_state.cc(621)] [state:0x7f5d32a3f000] ScheduleGCIfNeeded
[1738:1738:0107/112649.430225:VERBOSE2:thread_state.cc(621)] [state:0x7f5d32a3f000] ScheduleGCIfNeeded
[1738:1738:0107/112649.432101:VERBOSE2:thread_state.cc(621)] [state:0x7f5d32a3f000] ScheduleGCIfNeeded
[1738:1738:0107/112649.432829:VERBOSE2:thread_state.cc(621)] [state:0x7f5d32a3f000] ScheduleGCIfNeeded
[1738:1738:0107/112649.437749:VERBOSE1:local_window_proxy.cc(236)] A context is created NOT from snapshot
[1715:1731:0107/112649.439684:VERBOSE1:gles2_cmd_decoder.cc(3598)] GL_EXT_packed_depth_stencil supported.
[1715:1725:0107/112649.441334:VERBOSE1:network_delegate.cc(32)] NetworkDelegate::NotifyBeforeURLRequest: qrc:/resources/invalid
[1738:1738:0107/112649.443281:VERBOSE1:local_window_proxy.cc(236)] A context is created NOT from snapshot
[1715:1715:0107/112649.449975:VERBOSE1:navigator_impl.cc(140)] Failed Provisional Load: qrc:/resources/invalid, error_code: -3, error_description: , showing_repost_interstitial: 0, frame_id: 4
[1738:1738:0107/112649.462114:VERBOSE2:thread_state.cc(578)] [state:0x7f5d32a3f000] SchedulePageNavigationGCIfNeeded: estimatedRemovalRatio=0.14
[1738:1738:0107/112649.464390:VERBOSE2:thread_state.cc(523)] [state:0x7f5d32a3f000] ScheduleV8FollowupGCIfNeeded: v8_gc_type=MinorGC
[1738:1738:0107/112649.465227:VERBOSE1:local_window_proxy.cc(236)] A context is created NOT from snapshot
FAIL!  : tst_QWebEnginePage::dynamicFrame() Compared values are not the same
   Actual   (toPlainTextSync(&page).trimmed()): ""
   Expected (QStringLiteral("foo"))           : "foo"
   Loc: [/home/kiburtse/qt/rel/qtwebengine/tests/auto/widgets/qwebenginepage/tst_qwebenginepage.cpp(4485)]
PASS   : tst_QWebEnginePage::cleanupTestCase()
Totals: 2 passed, 1 failed, 0 skipped, 0 blacklisted, 348ms
********* Finished testing of tst_QWebEnginePage *********
[1715:1719:0107/112649.471710:VERBOSE1:sandbox_ipc_linux.cc(77)] SandboxIPCHandler stopping.

Network pane of devtools also shows status code difference of frame load: canceled and failed. This is also reproducible with chromium 71, and not with firefox.