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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-25081) Nested spill in ShuffleExternalSorter may access a released memory page
Date Fri, 10 Aug 2018 00:14:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-25081?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Apache Spark reassigned SPARK-25081:
------------------------------------

    Assignee: Shixiong Zhu  (was: Apache Spark)

> Nested spill in ShuffleExternalSorter may access a released memory page 
> ------------------------------------------------------------------------
>
>                 Key: SPARK-25081
>                 URL: https://issues.apache.org/jira/browse/SPARK-25081
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.3.1
>            Reporter: Shixiong Zhu
>            Assignee: Shixiong Zhu
>            Priority: Major
>
> This issue is pretty similar to SPARK-21907. 
> "allocateArray" in [ShuffleInMemorySorter.reset|https://github.com/apache/spark/blob/9b8521e53e56a53b44c02366a99f8a8ee1307bbf/core/src/main/java/org/apache/spark/shuffle/sort/ShuffleInMemorySorter.java#L99]
may trigger a spill and cause ShuffleInMemorySorter access the released `array`. Another task
may get the same memory page from the pool. This will cause two tasks access the same memory
page. When a task reads memory written by another task, many types of failures may happen.
Here are some examples I  have seen:
> - JVM crash. (This is easy to reproduce in a unit test as we fill newly allocated and
deallocated memory with 0xa5 and 0x5a bytes which usually points to an invalid memory address)
> - java.lang.IllegalArgumentException: Comparison method violates its general contract!
> - java.lang.NullPointerException at org.apache.spark.memory.TaskMemoryManager.getPage(TaskMemoryManager.java:384)
> - java.lang.UnsupportedOperationException: Cannot grow BufferHolder by size -536870912
because the size after growing exceeds size limitation 2147483632



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