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From "Charles Earl (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-3914) Mismatched free() / delete / delete [] in HadoopPipes
Date Sat, 25 Feb 2012 04:57:46 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3914?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Charles Earl updated MAPREDUCE-3914:
------------------------------------

    Attachment: MAPREDUCE-3914-branch-1.0.patch
                MAPREDUCE-3914-branch-0.23.patch

Patches for Hadoop 1.0 and 0.23
                
> Mismatched free() / delete / delete [] in HadoopPipes
> -----------------------------------------------------
>
>                 Key: MAPREDUCE-3914
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3914
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: pipes
>    Affects Versions: 0.20.205.0, 0.23.0, 1.0.0
>         Environment: Based upon map reduce pipes task executed on Ubuntu 11.10
>            Reporter: Charles Earl
>         Attachments: MAPREDUCE-3914-branch-0.23.patch, MAPREDUCE-3914-branch-1.0.patch
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> When running valgrind on a simple MapReduce pipes job, valgrind identifies a mismatched
new / delete:
> ==20394== Mismatched free() / delete / delete []
> ==20394==    at 0x4C27FF2: operator delete(void*) (vg_replace_malloc.c:387)
> ==20394==    by 0x4328A5: HadoopPipes::runTask(HadoopPipes::Factory const&) (HadoopPipes.cc:1171)
> ==20394==    by 0x424C33: main (ProcessRow.cpp:118)
> ==20394==  Address 0x9c5b540 is 0 bytes inside a block of size 131,072 alloc'd
> ==20394==    at 0x4C2864B: operator new[](unsigned long) (vg_replace_malloc.c:305)
> ==20394==    by 0x431E5D: HadoopPipes::runTask(HadoopPipes::Factory const&) (HadoopPipes.cc:1121)
> ==20394==    by 0x424C33: main (ProcessRow.cpp:118)
> ==20394== 
> ==20394== Mismatched free() / delete / delete []
> ==20394==    at 0x4C27FF2: operator delete(void*) (vg_replace_malloc.c:387)
> ==20394==    by 0x4328AF: HadoopPipes::runTask(HadoopPipes::Factory const&) (HadoopPipes.cc:1172)
> ==20394==    by 0x424C33: main (ProcessRow.cpp:118)
> ==20394==  Address 0x9c7b580 is 0 bytes inside a block of size 131,072 alloc'd
> ==20394==    at 0x4C2864B: operator new[](unsigned long) (vg_replace_malloc.c:305)
> ==20394==    by 0x431E6A: HadoopPipes::runTask(HadoopPipes::Factory const&) (HadoopPipes.cc:1122)
> ==20394==    by 0x424C33: main (ProcessRow.cpp:118)
> The new [] calls in Lines 1121 and 1122 of HadoopPipes.cc:
>         bufin = new char[bufsize];
>         bufout = new char[bufsize];
> should have matching delete [] calls but are instead bracketed my delete on lines 1171
and 1172:
>       delete bufin;
>       delete bufout;
> So these should be replaced by delete[]

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