[GHC] #12009: ASSERTION FAILED: file rts/LdvProfile.c, line 48

[GHC]

#12009: ASSERTION FAILED: file rts/LdvProfile.c, line 48
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        Reporter:  erikd             |                Owner:  erikd
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  7.10.3
      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 erikd):

 * cc: carter (added)


Comment:

 Oh wow, just realised that the profiling code is not thread safe!!!!!

 The function `LDV_recordDead` mutates global variable `censuses` which
 does not have any locking around it. Only figured this out because the
 following assert (in `LDV_recordDead`) was being triggered.

 {{{
     ASSERT(censuses[t].void_total < censuses[t].not_used);
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12009#comment:7>
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