This bug was filed from the Socorro interface and is report bp-7fc0196b-949f-4cb6-84d5-72c530171109. ============================================================= Top 10 frames of crashing thread: 0 xul.dll mozilla::net::Http2Session::FlushOutputQueue netwerk/protocol/http/Http2Session.cpp:590 1 @0x6ea11fee3f 2 xul.dll mozilla::net::Http2Session::ReadSegmentsAgain netwerk/protocol/http/Http2Session.cpp:2805 3 xul.dll mozilla::net::nsHttpConnection::OnSocketWritable netwerk/protocol/http/nsHttpConnection.cpp:1805 4 xul.dll mozilla::net::nsHttpConnection::OnOutputStreamReady netwerk/protocol/http/nsHttpConnection.cpp:2312 5 xul.dll mozilla::net::nsSocketOutputStream::OnSocketReady netwerk/base/nsSocketTransport2.cpp:563 6 xul.dll mozilla::net::nsSocketTransport::OnSocketReady netwerk/base/nsSocketTransport2.cpp:2199 7 xul.dll mozilla::net::nsSocketTransportService::DoPollIteration netwerk/base/nsSocketTransportService2.cpp:1215 8 xul.dll mozilla::net::nsSocketTransportService::Run netwerk/base/nsSocketTransportService2.cpp:947 9 xul.dll nsThread::ProcessNextEvent xpcom/threads/nsThread.cpp:1037 ============================================================= Application Basics: Name: Firefox Version: 58.0a1 Build ID: 20171108110838 Update Channel: nightly User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0 OS: Windows_NT 10.0

This looks similar to bug 1402014, except we actually have ReadSegmentsAgain on the stack here (so mSegmentReader, et al *should* be totally legit). This does have the patch from that bug, though. this happens on the same line, so it would appear that this is the same crash, and the patch is just not an appropriate fix.

dup of sec bug -> restrict access, especially given the comments about that bug