[GHC] #15158: T8089 failing with ghci, threaded1, threaded2, profthreaded

[GHC]

#15158: T8089 failing with ghci, threaded1, threaded2, profthreaded
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        Reporter:  alpmestan         |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  8.5
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Incorrect result  |  (amd64)
  at runtime                         |            Test Case:  T8089
      Blocked By:                    |             Blocking:
 Related Tickets:  #8089, #7325,     |  Differential Rev(s):
  #15064                             |
       Wiki Page:                    |
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Comment (by bgamari):

 It looks to me like there is a bug in the event manager. Specifically, it
 apparently makes no attempt to handle overflow when computing expiration
 times. Namely, `GHC.Event.TimerManager.registerTimeout` has:
 {{{#!hs
 now <- getMonotonicTimeNSec
 let expTime = fromIntegral us * 1000 + now
 }}}

 Even worse, we currently throw away the delay requested by the user,
 meaning it is no longer possible to account for overflow after
 registration.

 This can be fixed, but will require a bit more allocation in timeout
 registration.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15158#comment:2>
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