Reported for Fennec 4.0b2. http://crash-stats.mozilla.com/report/index/96b19170-7558-425e-a9ce-9d0132101104 Somehow we have a null entry in the header array? I find that very difficult to believe. Frame Module Signature [Expand] Source 0 libxul.so nsTArray<nsHttpHeaderArray::nsEntry>::IndexOf<nsHttpAtom, nsHttpHeaderArray::nsEntry::MatchHeader> nsTArray.h:331 1 libxul.so nsHttpHeaderArray::LookupEntry netwerk/protocol/http/nsHttpHeaderArray.cpp:228 2 libxul.so nsHttpHeaderArray::GetHeader netwerk/protocol/http/nsHttpHeaderArray.cpp:111 3 libxul.so nsHttpChannel::AddCacheEntryHeaders netwerk/protocol/http/nsHttpResponseHead.h:83 4 libxul.so nsHttpChannel::InitOfflineCacheEntry netwerk/protocol/http/nsHttpChannel.cpp:2929 5 libxul.so nsHttpChannel::CallOnStartRequest netwerk/protocol/http/nsHttpChannel.cpp:792 6 libxul.so nsHttpChannel::ContinueOnStartRequest3 netwerk/protocol/http/nsHttpChannel.cpp:3864 7 libxul.so nsHttpChannel::ContinueOnStartRequest2 netwerk/protocol/http/nsHttpChannel.cpp:3855 8 libxul.so nsHttpChannel::OnStartRequest netwerk/protocol/http/nsHttpChannel.cpp:3828 9 libxul.so nsInputStreamPump::OnStateStart netwerk/base/src/nsInputStreamPump.cpp:441 10 libxul.so nsInputStreamPump::OnInputStreamReady netwerk/base/src/nsInputStreamPump.cpp:397 11 libxul.so nsInputStreamReadyEvent::Run xpcom/io/nsStreamUtils.cpp:112 12 libxul.so nsThread::ProcessNextEvent xpcom/threads/nsThread.cpp:609 13 libxul.so NS_ProcessNextEvent_P nsThreadUtils.cpp:250 14 libxul.so nsThread::Shutdown xpcom/threads/nsThread.cpp:491 15 libxul.so nsSocketTransportService::Shutdown netwerk/base/src/nsSocketTransportService2.cpp:465 16 libxul.so nsIOService::SetOffline netwerk/base/src/nsIOService.cpp:729 17 libxul.so nsIOService::Observe netwerk/base/src/nsIOService.cpp:920 18 libxul.so nsObserverList::NotifyObservers xpcom/ds/nsObserverList.cpp:130 19 libxul.so nsObserverService::NotifyObservers xpcom/ds/nsObserverService.cpp:182 20 libxul.so nsXREDirProvider::DoShutdown toolkit/xre/nsXREDirProvider.cpp:798 21 libxul.so ScopedXPCOMStartup::~ScopedXPCOMStartup toolkit/xre/nsAppRunner.cpp:1113 22 libxul.so XRE_main toolkit/xre/nsAppRunner.cpp:3712 23 fennec main mobile/app/nsBrowserApp.cpp:155 24 libc-2.5.so libc-2.5.so@0x14973 25 fennec Output mobile/app/nsBrowserApp.cpp:77

I was just hitting this crash in Fennec. I was on Gmail, the connection was really bad (Mozilla Guest), so I reloaded, then Fennec crashed.

More Crashes: https://crash-stats.mozilla.com/report/list?range_value=7&range_unit=days&date=2011-10-31%2012%3A00%3A00&signature=nsTArray%3CnsHttpHeaderArray%3A%3AnsEntry%2C%20nsTArrayDefaultAllocator%3E%3A%3AIndexOf%3CnsHttpAtom%2C%20nsHttpHeaderArray%3A%3AnsEntry%3A%3AMatchHeader%3E%20%7C%20nsHttpHeaderArray%3A%3ALookupEntry&version=Fennec%3A9.0a2

Still seems to occur : https://crash-stats.mozilla.com/report/list?product=FennecAndroid&query_search=signature&query_type=contains&query=nsHttpHeaderArray%3A%3ALookupEntry&reason_type=contains&date=01%2F18%2F2012%2015%3A10%3A37&range_value=30&range_unit=days&hang_type=any&process_type=any&do_query=1&signature=nsTArray%3CnsHttpHeaderArray%3A%3AnsEntry%2C%20nsTArrayDefaultAllocator%3E%3A%3AIndexOf%3CnsHttpAtom%2C%20nsHttpHeaderArray%3A%3AnsEntry%3A%3AMatchHeader%3E%20|%20nsHttpHeaderArray%3A%3ALookupEntry

Crash still occurs : https://crash-stats.mozilla.com/query/query?product=FennecAndroid&version=ALL%3AALL&range_value=30&range_unit=days&date=02%2F09%2F2012+10%3A16%3A25&query_search=signature&query_type=contains&query=nsTArray&reason=&build_id=&process_type=any&hang_type=any&do_query=1

this should be fixed by bug 1247982.