[GHC] #12019: Profiling option -hb is not thread safe

[GHC]

#12019: Profiling option -hb is not thread safe
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        Reporter:  erikd             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11978, #12009    |  Differential Rev(s):  Phab:D2516
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"d1b4fec12250e608ca8a863ba4ef911084c468ef/ghc"
 d1b4fec1/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="d1b4fec12250e608ca8a863ba4ef911084c468ef"
 Mark T11978a as broken due to #12019

 Test Plan: `validate --slow`

 Reviewers: austin

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2536

 GHC Trac Issues: #12019
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12019#comment:12>
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