RFR(s): 8205583: Crash in ConcurrentHashTable do_bulk_delete_locked_for

David Holmes david.holmes at oracle.com
Tue Jun 26 01:32:30 UTC 2018

Hi Robbin,

Do you have any idea on what exact circumstances caused this bug to be 
exposed? I'm a little concerned that my mach5 testing accidentally 
tripped over it while our proper testing has not!


On 26/06/2018 4:26 AM, Robbin Ehn wrote:
> Hi all, please review.
> Webrev: http://cr.openjdk.java.net/~rehn/8205583/v0/webrev/index.html
> Issue: https://bugs.openjdk.java.net/browse/JDK-8205583
> The problem is that the cancel-able cleaning operation is unaware of 
> rehash.
> The cleaning starts, pauses for a safepoint which does the rehash, 
> destroying
> the old table. When the cleaning continues after the safepoint it will 
> continue
> to do so in the destroyed table.
> The cancelability of the cleaning operation is not needed and just creates
> complicity. In this change-set I remove that functionality, which means 
> a rehash
> will be postponed until the cleaning have finished. (identical as for 
> growing)
> Passed 700 runs of the test that produced the error and tier 1-3.
> Thanks, Robbin

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