id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
5111,linux-powerpc : segfault in stage2 compiler,erikd,,"After the patch to fix #4999, the compile gets a bit further and now crashes at:

{{{
""inplace/bin/ghc-stage2""   -H32m -O    -package-name vector-0.7.0.1 -hide-all-packages -i -ilibraries/vector/. -ilibraries/vector/dist-install/build -ilibraries/vector/dist-install/build/autogen -Ilibraries/vector/dist-install/build -Ilibraries/vector/dist-install/build/autogen -Ilibraries/vector/include -Ilibraries/vector/internal   -optP-DVECTOR_BOUNDS_CHECKS -optP-include -optPlibraries/vector/dist-install/build/autogen/cabal_macros.h -package base-4.3.1.0 -package primitive-0.3.1  -O2 -XHaskell98 -XCPP -XDeriveDataTypeable -O2 -XGenerics -no-user-package-conf -rtsopts     -odir libraries/vector/dist-install/build -hidir libraries/vector/dist-install/build -stubdir libraries/vector/dist-install/build -hisuf hi -osuf  o -hcsuf hc -c libraries/vector/./Data/Vector/Fusion/Stream/Monadic.hs -o libraries/vector/dist-install/build/Data/Vector/Fusion/Stream/Monadic.o
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package primitive-0.3.1 ... linking ... done.
Loading package ffi-1.0 ... linking ... done.
Segmentation fault
make[1]: *** [libraries/vector/dist-install/build/Data/Vector/Fusion/Stream/Monadic.o] Error 139
make: *** [all] Error 2
}}}

Compiling with debug on and running under gdb results in:

{{{
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package primitive-0.3.1 ... linking ... done.
Loading package ffi-1.0 ... linking ... done.

Program received signal SIGSEGV, Segmentation fault.
0xf19ea004 in ?? ()
(gdb) bt
#0  0xf19ea004 in ?? ()
#1  0x11a30f58 in schedule (initialCapability=0x93fb0070, task=0x3dc0f1de) at rts/Schedule.c:457
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
}}}

so this is crashing in haskell code, not the RTS.

Tracing this using putStr and friends I've tracked the bug to TcSplice.runMeta. It seems to crash when a thunk is evaluated just as that function returns. I'm still working on tracing back from there.

",bug,closed,normal,_|_,Compiler,7.1,duplicate,,pho@…,Linux,powerpc,Installing GHC failed,,,,,