[GHC] #15136: High CPU when asynchronous exception and unblocking retry on TVar raced

[GHC]

#15136: High CPU when asynchronous exception and unblocking retry on TVar raced
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        Reporter:  nshimaza          |                Owner:  osa1
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.6.1
       Component:  Runtime System    |              Version:  8.4.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by osa1):

 * owner:  (none) => osa1


Comment:

 I'll try implementing comment:5 see how it goes. This code path is not
 tested enough so I'll also try to port some of concurrency tests that use
 MVar and async exceptions (exercising `raiseAsync()`) to STM.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15136#comment:8>
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