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https://issues.apache.org/jira/browse/IMPALA-5031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16893006#comment-16893006
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ASF subversion and git services commented on IMPALA-5031:
---------------------------------------------------------
Commit 1c18a46c16484c596404f8d2661585ce0e53e187 in impala's branch
refs/heads/master from Jim Apple
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=1c18a46 ]
IMPALA-5031: Fix undefined behavior: ptr overflow
In expr.add, the standard says:
When an expression that has integral type is added to or
subtracted from a pointer, the result has the type of the pointer
operand. ... If both the pointer operand and the result point to
elements of the same array object, or one past the last element of
the array object, the evaluation shall not produce an overflow;
otherwise, the behavior is undefined.
This is triggered in the end-to-end tests.h The interesting part of
the backtrace is:
exec/parquet/hdfs-parquet-scanner.cc:1405:45: runtime error: pointer
index expression with base 0x00001300e0e9 overflowed to
0xffffffff1300e0ea
#0 HdfsParquetScanner::ProcessFooter()
exec/parquet/hdfs-parquet-scanner.cc:1405:45
#1 HdfsParquetScanner::Open(ScannerContext*)
exec/parquet/hdfs-parquet-scanner.cc:186:26
#2 HdfsScanNodeBase::CreateAndOpenScannerHelper(
HdfsPartitionDescriptor*, ScannerContext*,
scoped_ptr<HdfsScanner>*) exec/hdfs-scan-node-base.cc:721:59
#3 HdfsScanNodeMt::CreateAndOpenScanner(HdfsPartitionDescriptor*,
ScannerContext*, scoped_ptr<HdfsScanner>*)
exec/hdfs-scan-node-mt.cc:127:19
#4 HdfsScanNodeMt::GetNext(RuntimeState*, RowBatch*, bool*)
exec/hdfs-scan-node-mt.cc:97:21
Change-Id: I81c7db75b564045106edf3d46e2c4a62be77359f
Reviewed-on: http://gerrit.cloudera.org:8080/13889
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
> UBSAN clean and method for testing UBSAN cleanliness
> ----------------------------------------------------
>
> Key: IMPALA-5031
> URL: https://issues.apache.org/jira/browse/IMPALA-5031
> Project: IMPALA
> Issue Type: Task
> Components: Backend, Infrastructure
> Affects Versions: Impala 2.9.0
> Reporter: Jim Apple
> Assignee: Jim Apple
> Priority: Minor
>
> http://releases.llvm.org/3.8.0/tools/clang/docs/UndefinedBehaviorSanitizer.html
> builds are supported after https://gerrit.cloudera.org/#/c/6186/, but
> Impala's test suite triggers many errors under UBSAN. Those errors should be
> fixed and then there should be a way to run the test suite under UBSAN and
> fail if there were any errors detected.
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