[llvm-dev] Segfault in llc 3.8.0 building GHC

[Justin Bogner via llvm-dev]

Shea Levy via llvm-dev <llvm-dev at lists.llvm.org> writes:
> 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?

We do have point releases, but I don't know if there are any more
planned for the 3.8.x series. Tom (cc'd) would know.

> 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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