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

[Carter Schonwald]

could you share a minimal program that reproduces the problem?

On Tue, Jun 2, 2015 at 9:36 PM, Evan Laforge <qdunkan at gmail.com> wrote:

> After I upgraded to 7.10.1 I started noticing that my shakefile would
> lock up on exit.  It's after the 'main' function exits, and none of
> the shake tests have a problem, so presumably it's a GHC thing, that
> shake somehow causes to happen.  Only kill -9 gets it to quit.  Here's
> a stack trace from the OS X sampler:
>
> Call graph:
>     2801 Thread_909901   DispatchQueue_2:
> com.apple.libdispatch-manager  (serial)
>       2801 _dispatch_mgr_thread  (in libdispatch.dylib) + 52
> [0x7fff8828ca6a]
>         2801 kevent64  (in libsystem_kernel.dylib) + 10  [0x7fff90ec0232]
>
> Total number in stack (recursive counted multiple, when >=5):
>
> Sort by top of stack, same collapsed (when >= 5):
>         kevent64  (in libsystem_kernel.dylib)        2801
>
>
> I know there aren't a lot of details here, but does this sound
> familiar to anyone?  I can't see anything on
> https://ghc.haskell.org/trac/ghc/wiki/Status/GHC-7.10.2 that looks
> like this.  Is there any way I can get more information I can get to
> report this?
>
> It used to be frequent (once in 10 runs maybe), but later became quite
> infrequent (once in a couple hundred runs, maybe).  I downgraded to
> 7.8.4 and it hasn't happened again.
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