Re: ghc-stage2 —interactive segfaults on Mac OS X 10.11.6 (build flavour = prof)

[Alfredo Di Napoli]

Ok, I had success by removing “-debug” in favour of “-DDEBUG”. After
compiling GHC I fired GDB and this is the output:

Starting program:
/Users/adinapoli/programming/haskell/ghc/inplace/lib/bin/ghc-stage2
-B/Users/adinapoli/programming/haskell/ghc/inplace/lib --interactive
GHCi, version 8.3.20170413: http://www.haskell.org/ghc/  :? for help
[New Thread 0x120f of process 19786]
[New Thread 0x1403 of process 19786]
[New Thread 0x1503 of process 19786]
[New Thread 0x1603 of process 19786]

Thread 1 received signal SIGSEGV, Segmentation fault.
0x0000000104cdd81a in ocInit_MachO () at rts/linker/MachO.c:141
141         if(NULL != oc->info->nlist) {

Maybe it does ring a bell to any of you. In case not, I’m happy to continue
digging.

A.

On 14 April 2017 at 21:19, Alfredo Di Napoli <alfredo.dinapoli at gmail.com>
wrote:

> Hey Ben,
>
> yes, it’s consistently reproducible. I have tried compiling GHC from
> scratch by adding `-dcore-lint` and `-debug` to GhcStage2HcOpts in my mk/
> build.mk, but eventually the build process failed with:
>
> ld: library not found for -lHSrts_thr_debug_p
>
> Any idea what am I doing wrong? Next I’m going to try enabling `-DDEBUG`
> only as described here:
>
> https://ghc.haskell.org/trac/ghc/wiki/Debugging/Compiler
>
> To see if I get any further.
>
> Thanks!
>
> A.
>
>
> On 13 April 2017 at 19:01, Ben Gamari <ben at smart-cactus.org> wrote:
>
>> Alfredo Di Napoli <alfredo.dinapoli at gmail.com> writes:
>>
>> > Hey all,
>> >
>> > I’m trying to compile GHC HEAD (cloning from master) with the `prof`
>> build
>> > flavour on a Mac OS X 10.11.6 machine and I have noticed that, despite
>> > ghc-stage2 works as expected, when invoked with —interactive it starts
>> > before crashing with a segmentation fault:
>> >
>> > ```
>> > ☁  compiler [master] ⚡ ../inplace/bin/ghc-stage2 --interactive
>> > GHCi, version 8.3.20170413: http://www.haskell.org/ghc/  :? for help
>> > [1]    79176 segmentation fault  ../inplace/bin/ghc-stage2 --interactive
>> > ```
>> >
>> > Did it happen to somebody else or it’s just me? Shall I try throwing
>> gdb at
>> > it to try and see what’s going on?
>>
>> Hmm, interesting. I've not seen crashes like this locally nor in CI. It
>> would be great if you could try to get some insight. Is this crash
>> perfectly reproducible?
>>
>> It may be worth adding -dcore-lint to GhcStage2HcOpts to ensure the code
>> we are producing is sane.
>>
>> Cheers,
>>
>> - Ben
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.haskell.org/pipermail/ghc-devs/attachments/20170414/1f4f27c6/attachment.html>