kv/kvserver: TestBackpressureNotAppliedWhenReducingRangeSize failed

[cockroach-teamcity]

kv/kvserver.TestBackpressureNotAppliedWhenReducingRangeSize failed with artifacts on release-21.2 @ f9252df4856ff1397d62da811a672ceb05814a78:

=== RUN   TestBackpressureNotAppliedWhenReducingRangeSize
    test_log_scope.go:79: test logs captured to: /go/src/github.com/cockroachdb/cockroach/artifacts/logTestBackpressureNotAppliedWhenReducingRangeSize438892551
    test_log_scope.go:80: use -show-logs to present logs inline
=== CONT  TestBackpressureNotAppliedWhenReducingRangeSize
    client_replica_backpressure_test.go:307: -- test log scope end --
test logs left over in: /go/src/github.com/cockroachdb/cockroach/artifacts/logTestBackpressureNotAppliedWhenReducingRangeSize438892551
--- FAIL: TestBackpressureNotAppliedWhenReducingRangeSize (18.40s)
=== RUN   TestBackpressureNotAppliedWhenReducingRangeSize/backpressure_when_near_limit_on_new_node
    client_replica_backpressure_test.go:305: 
        	Error Trace:	client_replica_backpressure_test.go:305
        	Error:      	Not equal: 
        	            	expected: *errors.errorString(&errors.errorString{s:"context canceled"})
        	            	actual  : *pgconn.contextAlreadyDoneError(&pgconn.contextAlreadyDoneError{err:(*errors.errorString)(0xc0000b2290)})
        	Test:       	TestBackpressureNotAppliedWhenReducingRangeSize/backpressure_when_near_limit_on_new_node
    --- FAIL: TestBackpressureNotAppliedWhenReducingRangeSize/backpressure_when_near_limit_on_new_node (5.68s)

Reproduce

To reproduce, try:

make stressrace TESTS=TestBackpressureNotAppliedWhenReducingRangeSize PKG=./pkg/kv/kvserver TESTTIMEOUT=5m STRESSFLAGS='-timeout 5m' 2>&1

Parameters in this failure:

• GOFLAGS=-json

/cc @cockroachdb/kv ajwerner

This test on roachdash | Improve this report!

[tbg]

I think this just needs a backport of #69928.

[tbg]

It already got backported, but only after this issue was posted: #70125
So this is good to close.