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https://issues.apache.org/jira/browse/IGNITE-13906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17269529#comment-17269529
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Maxim Muzafarov commented on IGNITE-13906:
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Cherry-picked to 2.10
> Possible deadlock between methods from GridEncryptionManager
> ------------------------------------------------------------
>
> Key: IGNITE-13906
> URL: https://issues.apache.org/jira/browse/IGNITE-13906
> Project: Ignite
> Issue Type: Bug
> Affects Versions: 2.9
> Reporter: Mirza Aliev
> Assignee: Mirza Aliev
> Priority: Major
> Fix For: 2.10
>
>
> It seems that {{GridEncryptionManager}} uses {{metaStorageMux}} and
> {{checkpointReadLock}} in an inconsistent way.
> Sometimes, the implementation acquires the mutex fist and then
> {{checkpointReadLock}}, sometimes vice versa, which may lead to a deadlock.
> Let's consider the following scenario:
> Thread-1: {{removeGroupKey}} acquired {{metaStorageMux}} and trying to get
> {{checkpointReadLock}} (cannot proceed further because of checkpointer)
> Therad-2: {{doChangeMasterKey}} acquired {{checkpointReadLock}} and trying to
> get {{metaStorageMux}} (cannot proceed further due to thread-1)
> Checkpointer-thread: trying to acquire the write lock (cannot get the lock
> due to thread-2)
>
> Possible solutuion: acquire {{metaStorageMux}} before {{checkpointReadLock}}
> in {{doChangeMasterKey}} method
>
>
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