Strange data corruption with HEAD

Since at least 5f37e0c7 ghc has failed to build for me. The failure occurs early in the final stage build, showing up as,

"inplace/bin/ghc-stage2" -fPIC -dynamic  -H32m -O    -hide-all-packages -i -iutils/haddock/src -iutils/haddock/dist/build -iutils/haddock/dist/build/autogen -Iutils/haddock/dist/build -Iutils/haddock/dist/build/autogen    -optP-DIN_GHC_TREE -optP-include -optPutils/haddock/dist/build/autogen/cabal_macros.h -package Cabal-1.17.0 -package array-0.4.0.1 -package base-4.6.0.0 -package containers-0.5.0.0 -package directory-1.2.0.0 -package filepath-1.3.0.1 -package ghc-7.7.20121024 -package pretty-1.1.1.0 -package xhtml-3000.2.1 -package deepseq-1.3.0.1  -funbox-strict-fields -O2 -Wall -fwarn-tabs -XHaskell2010 -XCPP -XDeriveDataTypeable -XScopedTypeVariables -XMagicHash  -no-user-package-db -rtsopts      -odir utils/haddock/dist/build -hidir utils/haddock/dist/build -stubdir utils/haddock/dist/build -hisuf dyn_hi -osuf  dyn_o -hcsuf dyn_hc -c utils/haddock/src/Haddock/GhcUtils.hs -o utils/haddock/dist/build/Haddock/GhcUtils.dyn_o
/m/vinci7/data1/dietz/ghc/ghc/inplace/lib/settings: openFile: does not exist (No such file or directory)

Investigation with strace shows that the path passed to open() has been corrupted,

open("/m/vinci7/data1/dietz/ghc/ghc/inplace/lib/settin@\270\215\240\347\277\212", O_RDONLY|O_NOCTTY|O_NONBLOCK) = -1 ENOENT (No such file or directory)

Furthermore, the stage 1 testsuite fails immediately,

$ make
../mk/boilerplate.mk:149: ../mk/ghcconfig_m_vinci7_data1_dietz_ghc_ghc_inplace_bin_ghc-stage2.mk: No such file or directory
../mk/ghc-config "/m/vinci7/data1/dietz/ghc/ghc/inplace/bin/ghc-stage2" >"../mk/ghcconfig_m_vinci7_data1_dietz_ghc_ghc_inplace_bin_ghc-stage2.mk"; if [ $? != 0 ]; then rm -f "../mk/ghcconfig_m_vinci7_data1_dietz_ghc_ghc_inplace_bin_ghc-stage2.mk"; exit 1; fi
ghc-config: b���羌
make: *** [../mk/ghcconfig_m_vinci7_data1_dietz_ghc_ghc_inplace_bin_ghc-stage2.mk] Error 1

I am using gcc 4.4.6 and have tried both self-built ghc 7.4.2 and ghc 7.6.1 for stage 0.

Trac metadata

Trac field	Value
Version
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture