RFR: 8215206: VtableStubs::find_stub is not appropriately protected by VtableStubs_lock
erik.osterlund at oracle.com
Tue Dec 11 11:10:54 UTC 2018
In VtableStubs::find_stub we first perform a lookup in the table to
check for already created stubs under the VtableStubs_lock, then if not
found we create a new stub without the lock held, and then insert it
under the VtableStubs_lock without checking for entries inserted between
the lookup and insertion.
If the VtableStubs_lock is to protect the table (which is the
intention), the lock should not be unlocked before lookup and insert.
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