#2786: Blackhole loops are not detected and reported in GHCi
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Reporter: simonmar | Owner:
Type: bug | Status: new
Priority: normal | Milestone: _|_
Component: GHCi | Version: 6.8.3
Severity: normal | Keywords:
Difficulty: Unknown | Testcase:
Architecture: Unknown/Multiple | Os: Unknown/Multiple
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While looking into #2783 I noticed this. It has never worked, and I was
vaguely aware of it, but it seems we don't have a ticket.
{{{
let x = x in x
}}}
in GHCi should report `<<loop>>`. One issue is that the
`interruptTargetThread` global var points to the `ThreadId` running the
expression, which will keep it alive and prevent it from being detected as
deadlocked. But that's not all: I think the expression itself is being
retained by the main thread (perhaps because it is bound to `it`), which
will cause the child thread to also stay alive.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2786>
GHC <http://www.haskell.org/ghc/>
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