I'm running a tip of tree Chromium build which includes https://codereview.chromium.org/1977863003 and I hit the following:

Check failed: false. 
#0 0x7f29c61136ae base::debug::StackTrace::StackTrace()
#1 0x7f29c61764cf logging::LogMessage::~LogMessage()
#2 0x7f29c4f1fc95 net::HttpVaryData::MatchesRequest()
#3 0x7f29c5292fc1 net::HttpCache::Transaction::RequiresValidation()
#4 0x7f29c528ed78 net::HttpCache::Transaction::BeginCacheValidation()
#5 0x7f29c528e437 net::HttpCache::Transaction::BeginPartialCacheValidation()
#6 0x7f29c528a12f net::HttpCache::Transaction::DoCacheDispatchValidation()
#7 0x7f29c5283a33 net::HttpCache::Transaction::DoLoop()
#8 0x7f29c528280b net::HttpCache::Transaction::OnIOComplete()
#9 0x7f29c4f42b5b _ZN4base8internal15RunnableAdapterIMN3net18ClientSocketHandleEFviEE3RunIPS3_JiEEEvOT_DpOT0_
#10 0x7f29c51877e5 _ZN4base8internal12InvokeHelperILb1EvNS0_15RunnableAdapterIMN10disk_cache11SimpleIndexEFviEEEE8MakeItSoINS_7WeakPtrIS4_EEJiEEEvS7_T_DpOT0_
#11 0x7f29c5295a1d _ZN4base8internal7InvokerINS_13IndexSequenceIJLm0EEEENS0_9BindStateINS0_15RunnableAdapterIMN3net9HttpCache11TransactionEFviEEEFvPS8_iEJNS_7WeakPtrIS8_EEEEENS0_12InvokeHelperILb1EvSB_EEFviEE3RunEPNS0_13BindStateBaseEOi
#12 0x7f29c4f425d2 base::Callback<>::Run()
#13 0x7f29c50c3ab7 _ZN4base8internal12InvokeHelperILb0EvNS_8CallbackIFviELNS0_8CopyModeE1EEEE8MakeItSoIJRKiEEEvS5_DpOT_
#14 0x7f29c50c3a74 _ZN4base8internal7InvokerINS_13IndexSequenceIJLm0EEEENS0_9BindStateINS_8CallbackIFviELNS0_8CopyModeE1EEES6_JRiEEENS0_12InvokeHelperILb0EvS8_EEFvvEE3RunEPNS0_13BindStateBaseE
#15 0x7f29c60f3aee base::Callback<>::Run()
#16 0x7f29c611918e base::debug::TaskAnnotator::RunTask()
#17 0x7f29c6193cac base::MessageLoop::RunTask()
#18 0x7f29c6193f48 base::MessageLoop::DeferOrRunPendingTask()
#19 0x7f29c61941a2 base::MessageLoop::DoWork()
#20 0x7f29c61ae08e base::MessagePumpLibevent::Run()
#21 0x7f29c619369f base::MessageLoop::RunHandler()
#22 0x7f29c623c664 base::RunLoop::Run()
#23 0x7f29c6192714 base::MessageLoop::Run()
#24 0x7f29c62d3ab9 base::Thread::Run()
#25 0x7f29bf67f246 content::BrowserThreadImpl::IOThreadRun()
#26 0x7f29bf67f5ee content::BrowserThreadImpl::Run()
#27 0x7f29c62d3e09 base::Thread::ThreadMain()
#28 0x7f29c62bef9a base::(anonymous namespace)::ThreadFunc()
#29 0x7f29b3c81182 start_thread
#30 0x7f29b202847d clone