[slime-devel] Deadlock at the repl

Nikodemus Siivola nikodemus at random-state.net
Thu Mar 29 15:46:17 UTC 2012

On 10 March 2012 23:44, Helmut Eller <heller at common-lisp.net> wrote:

> Can you reproduce it with something other than SBCL?  It's known that
> SBCL's dispatch caches are deadlock prone.

This is an example of the kind of deadlock I was referring to a while
ago when I said that the flushing timeout was there for a reason.

The deadlock is this:

Compiler thread tries to output a compiler note. Holds world lock,
wants the slime's stream lock.

Auto flush thread tries to compile a dispatch function. Holds the
slime's stream lock, wants world lock.

...not saying that SBCL is behaving well here, but the deadlock is due
to interaction with slime's stream lock and the auto-flusher -- and
was fixed earlier.


 -- Nikodemus

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