Stage has request in progress

[rossabaker]

Not reliably reproducible:

[error]   ! behave and not deadlock on failures with parTraverse (618 ms)
[error]    org.http4s.client.blaze.Http1Connection$InProgressException$: Stage has request in progress (Http1Connection.scala:-1)
[error] org.http4s.client.blaze.Http1Connection$InProgressException$.<clinit>(Http1Connection.scala)
[error] org.http4s.client.blaze.Http1Connection.$anonfun$runRequest$1(Http1Connection.scala:108)
[error] cats.effect.internals.IORunLoop$.liftedTree1$1(IORunLoop.scala:93)
[error] cats.effect.internals.IORunLoop$.cats$effect$internals$IORunLoop$$loop(IORunLoop.scala:93)
[error] cats.effect.internals.IORunLoop$.startCancelable(IORunLoop.scala:41)
[error] cats.effect.internals.IOBracket$$anon$1.run(IOBracket.scala:95)
[error] cats.effect.internals.Trampoline.cats$effect$internals$Trampoline$$immediateLoop(Trampoline.scala:70)
[error] cats.effect.internals.Trampoline.startLoop(Trampoline.scala:36)
[error] cats.effect.internals.TrampolineEC$JVMTrampoline.super$startLoop(TrampolineEC.scala:93)
[error] cats.effect.internals.TrampolineEC$JVMTrampoline.$anonfun$startLoop$1(TrampolineEC.scala:93)
[error] cats.effect.internals.TrampolineEC$JVMTrampoline.startLoop(TrampolineEC.scala:93)
[error] cats.effect.internals.Trampoline.execute(Trampoline.scala:43)
[error] cats.effect.internals.TrampolineEC.execute(TrampolineEC.scala:44)
[error] cats.effect.internals.IOBracket$BracketStart.apply(IOBracket.scala:60)
[error] cats.effect.internals.IOBracket$BracketStart.apply(IOBracket.scala:41)
[error] cats.effect.internals.IORunLoop$.cats$effect$internals$IORunLoop$$loop(IORunLoop.scala:134)
[error] cats.effect.internals.IORunLoop$.start(IORunLoop.scala:34)
[error] cats.effect.internals.IOBracket$.$anonfun$apply$1(IOBracket.scala:36)
[error] cats.effect.internals.IOBracket$.$anonfun$apply$1$adapted(IOBracket.scala:33)
[error] cats.effect.internals.IORunLoop$RestartCallback.start(IORunLoop.scala:328)
[error] cats.effect.internals.IORunLoop$.cats$effect$internals$IORunLoop$$loop(IORunLoop.scala:117)
[error] cats.effect.internals.IORunLoop$RestartCallback.signal(IORunLoop.scala:336)
[error] cats.effect.internals.IORunLoop$RestartCallback.apply(IORunLoop.scala:357)
[error] cats.effect.internals.IORunLoop$RestartCallback.apply(IORunLoop.scala:303)
[error] cats.effect.internals.IOShift$Tick.run(IOShift.scala:36)

[rossabaker]

Fixed by #2258.