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

[Moritz Angermann]

Hi,

that looks pretty much like I broke that :-(
Do you have a backtrace? The info structs should be filled properly by ocInit_MachO when loading object code.

The nlist would point to the symbol names list. However I believe that either oc is already NULL, in which case you should have never reached that point, or info is NULL, in which case ocInit seems to not have been called.

I'll try to reproduce this today.

Cheers,
 Moritz

Sent from my iPhone

> On 15 Apr 2017, at 3:33 AM, Alfredo Di Napoli <alfredo.dinapoli at gmail.com> wrote:
> 
> 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
>>> 
>> 
> 
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