docs-haddock Hadrian target doesn't work reliably

Starting with a clean build, the following doesn't work:

$ ./hadrian/build.sh -c docs-haddock

However, it does work if you've already run ./hadrian/build.sh -c. Here's a sample --verbose log (this was produced with ./hadrian/build.sh -c --build-root=_qkst-integer-simple --flavour=quickest docs-haddock --integer-simple --verbose, but the problem exhibits even without all the extra options):

Up to date
Up to date
| ContextData oracle: resolving data for 'haddock' (Stage2, v)...
| Configure package 'haddock'
Configuring haddock-2.22.0...
creating
/Users/atheriault/Code/ghc/_qkst-integer-simple/stage2/utils/haddock/build
/Users/atheriault/Code/ghc/_qkst-integer-simple/stage1/bin/ghc --numeric-version
/Users/atheriault/Code/ghc/_qkst-integer-simple/stage1/bin/ghc is version
8.7.20181227
/Users/atheriault/Code/ghc/_qkst-integer-simple/stage0/bin/ghc-pkg --version
/Users/atheriault/Code/ghc/_qkst-integer-simple/stage0/bin/ghc-pkg is version
8.7.20181227
/Users/atheriault/Code/ghc/_qkst-integer-simple/stage1/bin/ghc --supported-languages
/Users/atheriault/Code/ghc/_qkst-integer-simple/stage1/bin/ghc --info
Reading installed packages...
/Users/atheriault/Code/ghc/_qkst-integer-simple/stage0/bin/ghc-pkg dump --global -v0 '--global-package-db=/Users/atheriault/Code/ghc/_qkst-integer-simple/stage1/lib/package.conf.d'
/Users/atheriault/Code/ghc/_qkst-integer-simple/stage1/bin/ghc --print-libdir '-ghcversion-file=/Users/atheriault/Code/ghc/_qkst-integer-simple/generated/ghcversion.h'
CallStack (from HasCallStack):
  die', called at ./Distribution/Simple/Configure.hs:969:20 in Cabal-2.5.0.0-inplace:Distribution.Simple.Configure
  configureFinalizedPackage, called at ./Distribution/Simple/Configure.hs:467:12 in Cabal-2.5.0.0-inplace:Distribution.Simple.Configure
  configure, called at ./Distribution/Simple.hs:596:20 in Cabal-2.5.0.0-inplace:Distribution.Simple
  confHook, called at ./Distribution/Simple/UserHooks.hs:67:5 in Cabal-2.5.0.0-inplace:Distribution.Simple.UserHooks
  configureAction, called at ./Distribution/Simple.hs:178:19 in Cabal-2.5.0.0-inplace:Distribution.Simple
  defaultMainHelper, called at ./Distribution/Simple.hs:148:3 in Cabal-2.5.0.0-inplace:Distribution.Simple
  defaultMainWithHooksNoReadArgs, called at src/Hadrian/Haskell/Cabal/Parse.hs:145:14 in main:Hadrian.Haskell.Cabal.Parse
hadrian: Encountered missing dependencies:
xhtml ==3000.2.*

shakeArgsWith   0.000s    0%                           
Function shake  0.010s    0%                           
Database read   0.317s   12%  ===                      
With database   0.018s    0%                           
Running rules   2.166s   86%  =========================
Total           2.511s   99%                           
Error when running Shake build system:
  at src/Main.hs:58:30-42:
* Depends on: docs-haddock
  at src/Rules/Documentation.hs:79:9-48:
* Depends on: _qkst-integer-simple/docs/html/libraries/index.html
  at src/Rules/Documentation.hs:136:9-24:
* Depends on: _qkst-integer-simple/docs/html/libraries/ghc-prim/ghc-prim.haddock
  at src/Hadrian/Builder.hs:70:5-23:
* Depends on: _qkst-integer-simple/stage2/bin/haddock
  at src/Development/Shake/Internal/Rules/Oracle.hs:157:43-68:
* Depends on: OracleQ (ContextDataKey (Context {stage = Stage2, package = Package {pkgType = Program, pkgName = "haddock", pkgPath = "utils/haddock"}, way = v}))
  at src/Hadrian/Haskell/Cabal/Parse.hs:202:5-36:
* Depends on: _qkst-integer-simple/stage2/utils/haddock/setup-config
* Raised the exception:
ExitFailure 1

Trac metadata

Trac field	Value
Version	8.6.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Build System (Hadrian)
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