[llvm-dev] Segfault in llc 3.8.0 building GHC

[Shea Levy via llvm-dev]

I found a fix! The first hunk of https://reviews.llvm.org/D17533
(lib/CodeGen/TargetFrameLoweringImpl.cpp) on top of 3.8.1 does the
trick.

Does llvm do patch releases of old versions?

Davide Italiano <davide at freebsd.org> writes:

> 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
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>
> 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
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