ghc 7.10.1 hard lock on exit with shake, OS X 10.10

[Evan Laforge]

Oops, no it wasn't.  Still getting lock-ups with 7.10.1.20150612,
though they are rare.

But this report seems not so useful since I don't really know how to
make progress on reducing and reproducing.  Maybe it's best to wait to
see if any other reports come in.  A large company doing many builds a
day would see this a lot, so unless it's somehow specific to my
configuration, eventually more reports should come in.

On Tue, Jun 16, 2015 at 11:19 PM, Evan Laforge <qdunkan at gmail.com> wrote:
> I've been trying the 7.10.2 testing release for the last few days, and
> so far no lock-ups.
> Maybe that was it!
>
> On Tue, Jun 2, 2015 at 11:29 PM, Austin Seipp <austin at well-typed.com> wrote:
>> Perhaps #10317 is related?
>>
>> https://ghc.haskell.org/trac/ghc/ticket/10317
>>
>> You might try building with the latest ghc-7.10 branch.
>>
>> On Wed, Jun 3, 2015 at 12:27 AM, Evan Laforge <qdunkan at gmail.com> wrote:
>>> On Tue, Jun 2, 2015 at 7:20 PM, Carter Schonwald
>>> <carter.schonwald at gmail.com> wrote:
>>>> could you share a minimal program that reproduces the problem?
>>>
>>> That's the thing, it's a thousand line shakefile that builds a 100k
>>> line program, and it's happening only rarely now.  Since it happens so
>>> rarely it seems really difficult to prune away bits to see if it still
>>> happens.  I suppose since the building is all just running commands,
>>> the source it's building doesn't matter, but since it's a build, it
>>> runs a different sequence of commands every time.  I suppose I could
>>> "stub out" the program by replacing ghc with a shell script that
>>> sleeps and touches the output files, but it feels like I could spend
>>> days on it because there are tons of little details.
>>>
>>> I'm pretty sure it's related to the threaded runtime, because it
>>> doesn't happen without -threaded.  I could try with -debug, but that
>>> probably turns off -threaded too, so no more problem.  Shake is
>>> heavily threaded and nondeterministic.  I haven't seen other shake
>>> users report it though.
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>>>
>>
>>
>>
>> --
>> Regards,
>>
>> Austin Seipp, Haskell Consultant
>> Well-Typed LLP, http://www.well-typed.com/