Possible bug related to stm and exceptions

Ryan Yates fryguybob at gmail.com
Thu Oct 17 13:35:36 UTC 2013

The bug that Luite and I uncovered is
http://ghc.haskell.org/trac/ghc/ticket/7930.  It would not be related.
 There was a bug relating to `catchSTM` that was fixed recently:
http://ghc.haskell.org/trac/ghc/ticket/8035.  And another related to
profiling: http://ghc.haskell.org/trac/ghc/ticket/8298.  I doubt either of
these is related.  I'm happy to help narrow things down.


On Thu, Oct 17, 2013 at 4:39 AM, Simon Marlow <marlowsd at gmail.com> wrote:

> On 17/10/2013 03:01, Andreas Voellmy wrote:
>> Hi all,
>> I have a program that uses STM heavily and also performs lots of foreign
>> calls. I've noticed that sometimes the program uses 100% CPU
>> indefinitely and uses lots of memory - I see it go up to about 5GB
>> before I kill it. I've grabbed some preliminary samples of stack traces
>> and see lots stm related stuff (e.g. lots of stg_atomically_frame_info
>> and stmCommitTransaction entries).  I can pretty reliably get the
>> behavior to happen now by closing a socket that my Haskell program is
>> trying to recv from. When this causes an exception to be raised
>> (something like "recv: resource vanished (Connection reset by peer)") ,
>> then this behavior gets triggered.  I haven't pinned down the bug yet,
>> but I'm suspecting it is STM related - somehow the exception causes some
>> STM transaction to go wrong.
>> Are there any known bugs that sound similar to this?
>> BTW, this is with GHC 7.6.3 from a recent HP release on OS X.
> Please create a ticket and dump all the information you have in it. There
> might be something we can tell from the stack trace, but if not we'll need
> a way to reproduce it.
> Cheers,
> Simon
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