from the log, this could be the reason that caused timeout. 17:58:06 INFO - [Child 1320] ###!!! ASSERTION: no SHEntry for a non-transient viewer?: 'NS_IsAboutBlank(mCurrentURI)', file /home/worker/workspace/build/src/docshell/base/nsDocShell.cpp, line 11467 17:59:10 INFO - #01: nsDocShell::OnLoadingSite [docshell/base/nsDocShell.cpp:11625] 17:59:10 INFO - #02: nsDocShell::CreateContentViewer [docshell/base/nsDocShell.cpp:9100] 17:59:10 INFO - #03: nsDSURIContentListener::DoContent [docshell/base/nsDSURIContentListener.cpp:129] 17:59:10 INFO - #04: nsDocumentOpenInfo::TryContentListener [uriloader/base/nsURILoader.cpp:724] 17:59:10 INFO - #05: nsDocumentOpenInfo::DispatchContent [uriloader/base/nsURILoader.cpp:398] 17:59:10 INFO - #06: nsDocumentOpenInfo::OnStartRequest [uriloader/base/nsURILoader.cpp:261] 17:59:10 INFO - #07: mozilla::net::HttpChannelChild::DoOnStartRequest [netwerk/protocol/http/HttpChannelChild.cpp:526] 17:59:10 INFO - #08: mozilla::net::HttpChannelChild::OnStartRequest [netwerk/protocol/http/HttpChannelChild.cpp:443] 17:59:10 INFO - #09: mozilla::net::StartRequestEvent::Run [netwerk/protocol/http/HttpChannelChild.cpp:340] 17:59:10 INFO - #10: mozilla::net::ChannelEventQueue::RunOrEnqueue [mfbt/UniquePtr.h:288] 17:59:10 INFO - #11: mozilla::net::HttpChannelChild::RecvOnStartRequest [netwerk/protocol/http/HttpChannelChild.cpp:392] 17:59:10 INFO - #12: mozilla::net::PHttpChannelChild::OnMessageReceived [obj-firefox/ipc/ipdl/PHttpChannelChild.cpp:649] 17:59:10 INFO - #13: mozilla::ipc::MessageChannel::DispatchAsyncMessage [ipc/glue/MessageChannel.h:552] 17:59:10 INFO - #14: mozilla::ipc::MessageChannel::DispatchMessage [ipc/glue/MessageChannel.cpp:1598] 17:59:10 INFO - #15: mozilla::ipc::MessageChannel::OnMaybeDequeueOne [ipc/glue/MessageChannel.cpp:1552] 17:59:10 INFO - #16: nsRunnableMethodImpl<bool (mozilla::ipc::MessageChannel::*)(), false, true>::Run [xpcom/glue/nsThreadUtils.h:759] 17:59:10 INFO - #17: mozilla::ipc::MessageChannel::DequeueTask::Run [ipc/glue/MessageChannel.h:498] 17:59:10 INFO - #18: nsThread::ProcessNextEvent [xpcom/threads/nsThread.cpp:1073] 17:59:10 INFO - #19: NS_ProcessNextEvent [xpcom/glue/nsThreadUtils.cpp:290] 17:59:10 INFO - #20: mozilla::ipc::MessagePump::Run [ipc/glue/MessagePump.cpp:132] 17:59:10 INFO - #21: MessageLoop::RunInternal [ipc/chromium/src/base/message_loop.cc:236] 17:59:10 INFO - #22: MessageLoop::Run [ipc/chromium/src/base/message_loop.cc:493] 17:59:10 INFO - #23: nsBaseAppShell::Run [widget/nsBaseAppShell.cpp:158] 17:59:10 INFO - #24: XRE_RunAppShell [toolkit/xre/nsEmbedFunctions.cpp:832] 17:59:10 INFO - #25: mozilla::ipc::MessagePumpForChildProcess::Run [ipc/glue/MessagePump.cpp:285] 17:59:10 INFO - #26: MessageLoop::RunInternal [ipc/chromium/src/base/message_loop.cc:236] 17:59:10 INFO - #27: MessageLoop::Run [ipc/chromium/src/base/message_loop.cc:493] 17:59:10 INFO - #28: XRE_InitChildProcess [toolkit/xre/nsEmbedFunctions.cpp:666] 17:59:10 INFO - #29: content_process_main [ipc/contentproc/plugin-container.cpp:227] 17:59:10 INFO - #30: libc.so.6 + 0x2176d 17:59:10 INFO - #31: _start

Hi Baku From the log (Comment 2), I am still not sure the assertion is the root cause here, but those failures only occured in debug build, and the assert is also only enabled in debug build (NS_Assert inside #ifdef DEBUG), so I suspect they are related. It looks like that container tab doesn't have correct SessionHistory after SessionRestore(more specifically, after nsISessionStore.setWindowState). Also in my local test, if I make all tabs are normal tabs(i.e., userContextId: 0), I won't see the assertion. I guess there's something wrong with SessionHistory in container tab, can you provide some suggestions here? Thanks

Yoshi, sorry for the delay. Can you reproduce this bug locally? Is it easy to reproduce? I don't know the reason why we have this issue, but I'll try to reproduce it locally.

(In reply to Andrea Marchesini [:baku] from comment #6) > Yoshi, sorry for the delay. > > Can you reproduce this bug locally? Is it easy to reproduce? Hi Baku I can see the assertion (NS_Assert) from comment 2 locally everytime I run this test, although the tests still pass successfully. Anyway, thanks for your help, I'll keep looking into this, if I have further information will ask for your suggestion then. :)

There have been no orange reports in over 2 months. Is this still an issue? Can it be reproduced, or can we close worksforme?

Actually it has not happened over 3 months. I am going to close it. Anyone feel free to reopen if you can reproduce it.