[infinispan-issues] [JBoss JIRA] (ISPN-2728) AbstractCacheTransaction.hasLockOrIsLockBackup may cause NPE

[Radim Vansa (JIRA)]

Radim Vansa created ISPN-2728:
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             Summary: AbstractCacheTransaction.hasLockOrIsLockBackup may cause NPE
                 Key: ISPN-2728
                 URL: https://issues.jboss.org/browse/ISPN-2728
             Project: Infinispan
          Issue Type: Bug
            Reporter: Radim Vansa
            Assignee: Mircea Markus


{{AbstractCacheTransaction.hasLockOrIsLockBackup}} can be called from non-synchronized context (particularly from the {{AbstractTxLockingInterceptor}} when iterating through all transactions from older topology). If the transaction is committed in parallel, {{AbstractCacheTransaction.clearLockedKeys}} is called which nulls the volatile field {{lockedKeys}}.
{code}
lockedKeys != null && lockedKeys.contains(key)
{code}
Contains a race condition - lockedKey may be nulled between the checks.
Similar with {{backupKeyLocks}} but these are never nulled.

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