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  • #9296

Closed
Open
Opened Jul 11, 2014 by edsko@edsko.net@trac-edsko

Acquire all_tasks_mutex in forkProcess

In forkProcess we acquire a bunch of mutexes so make sure that when we fork the child doesn't see an inconsistent state of any global data structures. However, we do not acquire the all_tasks_mutex, which means that the child might have an inconsistent view of the all_tasks list.

https://phabricator.haskell.org/D60

Sadly, I do not have a test case illustrating that this is in fact a problem. Found this while working tracking down a deadlock in forkProcess (https://ghc.haskell.org/trac/ghc/ticket/9295).

Trac metadata
Trac field Value
Version 7.8.2
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
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Blocking
CC
Operating system
Architecture
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7.8.4
Milestone
7.8.4 (Past due)
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Reference: ghc/ghc#9296