[llvm-dev] Segfault in llc 3.8.0 building GHC

[Davide Italiano via llvm-dev]

On Fri, Oct 21, 2016 at 6:19 AM, Shea Levy via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> Hi all,
>
> I'm hitting a segfault in llc when trying to build GHC:
> http://sprunge.us/ZVGB. What is the best way to debug this? I'm able to
> bump to 3.8.1 if needed, but GHC tends to break when updating major
> versions due to IR incompatibilities.
>
> Thanks,
> Shea
>
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The stack dump contains the program arguments so you should be able to
reproduce the crash yourself.

0. Program arguments:
/nix/store/izlawmnrzpk5sbr62c757cxay0kdlgam-llvm-3.8.0/bin/llc -O3
-relocation-model=dynamic-no-pic
/private/tmp/nix-build-ghc-8.1.201601019.drv-3/ghc37608_0/ghc_5.bc -o
/private/tmp/nix-build-ghc-8.1.201601019.drv-3/ghc37608_0/ghc_6.lm_s
--enable-tbaa=true -mattr=+v7,+vfp3
[...]
1. Running pass 'Function Pass Manager' on module
'/private/tmp/nix-build-ghc-8.1.201601019.drv-3/ghc37608_0/ghc_5.bc'.
2. Running pass 'Prologue/Epilogue Insertion & Frame Finalization' on
function '@"stg_unmaskAsyncExceptionszh_ret_info$def"'

If you're able to repro, I recommend to get LLVM trunk from svn and
see if you can still reproduce, and report a bug in that case (or if
it doesn't, backport the commit(s) that fixed).

-- 
Davide

"There are no solved problems; there are only problems that are more
or less solved" -- Henri Poincare