Reproducing a build failure

[Simon Peyton Jones]

Friends

In !14410, specifically on Fedora, I get this build failure
<https://gitlab.haskell.org/ghc/ghc/-/jobs/2225860>.  Some kind of crash in
some invocation of Haddock to make the docs for ghc-internal.

Question: how can I reproduce this failure on my own machine?  It builds
fine for me.

Thanks

Simon


Error when running Shake build system:
at want, called at src/Main.hs:127:44 in main:Main
* Depends on: binary-dist
at need, called at src/Rules/BinaryDist.hs:311:13 in main:Rules.BinaryDist
* Depends on: binary-dist-dir
at need, called at src/Rules/BinaryDist.hs:168:9 in main:Rules.BinaryDist
* Depends on: docs
at need, called at src/Rules/Documentation.hs:137:9 in
main:Rules.Documentation
* Depends on: _build/doc/html/index.html
at need, called at src/Rules/Documentation.hs:214:9 in
main:Rules.Documentation
* Depends on: _build/doc/html/libraries/index.html
at need, called at src/Rules/Documentation.hs:251:9 in
main:Rules.Documentation
* Depends on:
_build/doc/html/libraries/ghc-internal-9.1400.0-9f99/ghc-internal.haddock
at cmd, called at src/Builder.hs:404:5 in main:Builder
* Raised the exception:
Development.Shake.cmd, system command failed
Command line: _build/stage1/bin/haddock --verbosity=0 -B_build/stage1/lib
--lib=_build/stage1/lib
--odir=_build/doc/html/libraries/ghc-internal-9.1400.0-9f99
--dump-interface=_build/doc/html/libraries/ghc-internal-9.1400.0-9f99/ghc-internal.haddock
--html '--title=ghc-internal-9.1400.0: Basic libraries'
--prologue=_build/doc/html/libraries/ghc-internal-9.1400.0-9f99/haddock-prologue.txt
--optghc=-D__HADDOCK_VERSION__=2300
--hide=GHC.Internal.Data.Typeable.Internal
--hide=GHC.Internal.IO.Handle.Lock.Common
--hide=GHC.Internal.IO.Handle.Lock.Flock
--hide=GHC.Internal.IO.Handle.Lock.LinuxOFD
--hide=GHC.Internal.IO.Handle.Lock.NoOp
--hide=GHC.Internal.IO.Handle.Lock.Windows
--hide=GHC.Internal.StaticPtr.Internal --hide=GHC.Internal.Event.Arr
--hide=GHC.Internal.Event.Array --hide=GHC.Internal.Event.Internal
--hide=GHC.Internal.Event.Internal.Types --hide=GHC.Internal.Event.IntTable
--hide=GHC.Internal.Event.IntVar --hide=GHC.Internal.Event.PSQ
--hide=GHC.Internal.Event.Unique --hide=GHC.Internal.Unicode.Bits
--hide=GHC.Internal.Unicode.Char.DerivedCoreProperties
--hide=GHC.Internal.Unicode.Char.UnicodeData.GeneralCategory
--hide=GHC.Internal.Unicode.Char.UnicodeData.SimpleLowerCaseMapping
--hide=GHC.Internal.Unicode.Char.UnicodeData.SimpleTitleCaseMapping
--hide=GHC.Internal.Unicode.Char.UnicodeData.SimpleUpperCaseMapping
--hide=GHC.Internal.Unicode.Version
--hide=GHC.Internal.System.Environment.ExecutablePath
--hide=GHC.Internal.Bignum.Backend.GMP --hide=GHC.Internal.Event.Control
--hide=GHC.Internal.Event.EPoll --hide=GHC.Internal.Event.KQueue
--hide=GHC.Internal.Event.Manager --hide=GHC.Internal.Event.Poll
--hide=GHC.Internal.Event.Thread --hide=GHC.Internal.Event.TimerManager
--optghc=-hisuf --optghc=dyn_hi --optghc=-osuf --optghc=dyn_o
--optghc=-hcsuf --optghc=dyn_hc --optghc=-fPIC --optghc=-dynamic
--optghc=-hide-all-packages --optghc=-no-user-package-db
'--optghc=-package-env -' '--optghc=-this-unit-id
ghc-internal-9.1400.0-9f99' '--optghc=-this-package-name ghc-internal'
'--optghc=-package-id rts-1.0.3' --optghc=-i
--optghc=-i/builds/ghc/ghc/_build/stage1/libraries/ghc-internal/build
--optghc=-i/builds/ghc/ghc/_build/stage1/libraries/ghc-internal/build/autogen
--optghc=-i/builds/ghc/ghc/libraries/ghc-internal/src
--optghc=-Irts/include
--optghc=-I_build/stage1/libraries/ghc-internal/build
--optghc=-I_build/stage1/libraries/ghc-internal/build/include
--optghc=-Ilibraries/ghc-internal/include
--optghc=-I/builds/ghc/ghc/rts/include
--optghc=-I/builds/ghc/ghc/_build/stage1/rts/build/include
--optghc=-optP-include
--optghc=-optP_build/stage1/libraries/ghc-internal/build/autogen/cabal_macros.h
--optghc=-optP-DBIGNUM_GMP --optghc=-outputdir
--optghc=_build/stage1/libraries/ghc-internal/build --optghc=-this-unit-id
--optghc=ghc-internal --optghc=-Wcompat
--optghc=-Wnoncanonical-monad-instances --optghc=-XHaskell2010
--optghc=-XNoImplicitPrelude --optghc=-no-global-package-db
--optghc=-package-db=/builds/ghc/ghc/_build/stage1/inplace/package.conf.d
--optghc=-ghcversion-file=rts/include/ghcversion.h
--optghc=-ghcversion-file=rts/include/ghcversion.h --optghc=-this-unit-id
--optghc=ghc-internal --optghc=-Wcompat
--optghc=-Wnoncanonical-monad-instances --optghc=-XHaskell2010
--optghc=-XNoImplicitPrelude --optghc=-no-global-package-db
--optghc=-package-db=/builds/ghc/ghc/_build/stage1/inplace/package.conf.d
--optghc=-ghcversion-file=rts/include/ghcversion.h
--optghc=-ghcversion-file=rts/include/ghcversion.h
--optghc=-Wno-deprecated-flags --optghc=-Wno-trustworthy-safe +RTS
-t_build/stage1/haddock-timing-files/ghc-internal.t --machine-readable -RTS
--hyperlinked-source --hoogle --quickjump
@/tmp/extra-file-54706448418404-4067-11690
Exit code: 1
Stderr:
<no location info>: error:
panic! (the 'impossible' happened)
GHC version 9.14.0.20250710:
idDetails
a_alNe
Call stack:
CallStack (from HasCallStack):
pprPanic, called at compiler/GHC/Types/Var.hs:1079:43 in
ghc-9.14.0.20250710-7d78:GHC.Types.Var
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