runtime: add one extra lock ranking partial edge

This adds an assistQueue -> mheapSpecial edge, which can happen via

gcFlushBgCredit [gets assistQueue lock] -> ready() -> ... ->
allocm() -> newobject -> .. mProf_Malloc() ->
setprofilebucket() [gets mheap special lock]

From https://build.golang.org/log/6f8f253f6c3a747de411cfdf78c27980146618be

Change-Id: Icdfba41b49aa704e8f6f20d25271f938afaf52ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/231463
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

diff --git a/src/runtime/lockrank.go b/src/runtime/lockrank.go
index 05fff9579776004631672db356c7165d8a674bf6..5174adc8bff633c0692a06d60d47868a61cb42b2 100644 (file)
--- a/src/runtime/lockrank.go
+++ b/src/runtime/lockrank.go
@@ -223,7 +223,7 @@ var lockPartialOrder [][]lockRank = [][]lockRank{
        lockRankSudog:        {lockRankNotifyList, lockRankHchan},
        lockRankWbufSpans:    {lockRankScavenge, lockRankSweepWaiters, lockRankAssistQueue, lockRankSweep, lockRankSched, lockRankAllg, lockRankPollDesc, lockRankTimers, lockRankItab, lockRankReflectOffs, lockRankHchan, lockRankNotifyList, lockRankTraceStrings, lockRankMspanSpecial, lockRankProf, lockRankRoot, lockRankDefer, lockRankSudog},
        lockRankMheap:        {lockRankScavenge, lockRankSweepWaiters, lockRankAssistQueue, lockRankCpuprof, lockRankSweep, lockRankSched, lockRankAllg, lockRankAllp, lockRankPollDesc, lockRankTimers, lockRankItab, lockRankReflectOffs, lockRankNotifyList, lockRankTraceBuf, lockRankTraceStrings, lockRankHchan, lockRankMspanSpecial, lockRankProf, lockRankGcBitsArenas, lockRankRoot, lockRankMcentral, lockRankStackpool, lockRankStackLarge, lockRankDefer, lockRankSudog, lockRankWbufSpans, lockRankSpanSetSpine},
-       lockRankMheapSpecial: {lockRankScavenge, lockRankCpuprof, lockRankSweep, lockRankSched, lockRankAllg, lockRankAllp, lockRankTimers, lockRankItab, lockRankReflectOffs, lockRankNotifyList, lockRankTraceBuf, lockRankTraceStrings, lockRankHchan},
+       lockRankMheapSpecial: {lockRankScavenge, lockRankAssistQueue, lockRankCpuprof, lockRankSweep, lockRankSched, lockRankAllg, lockRankAllp, lockRankTimers, lockRankItab, lockRankReflectOffs, lockRankNotifyList, lockRankTraceBuf, lockRankTraceStrings, lockRankHchan},
        lockRankGlobalAlloc:  {lockRankProf, lockRankSpine, lockRankSpanSetSpine, lockRankMheap, lockRankMheapSpecial},
 
        lockRankGFree: {lockRankSched},