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https://issues.apache.org/jira/browse/QPID-8184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16466468#comment-16466468
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Kim van der Riet commented on QPID-8184:
----------------------------------------
Pavel Moravec has discovered the root cause of this issue, see
[https://bugzilla.redhat.com/show_bug.cgi?id=1561819#c18.] It appears that when
using ::readlink(), the string containing the link destination is copied into
the supplied buffer, but without being terminated with a '\0'. In some cases,
there is remaining data in the buffer which when searched from the rear of the
string yields odd results.
The issue appears to be solved by simply terminating the string in the buffer
with a '\0'.
> [linearstore] Recovery intermittently produces JERR_EFP_BADEFPDIRNAME error
> followed by core
> --------------------------------------------------------------------------------------------
>
> Key: QPID-8184
> URL: https://issues.apache.org/jira/browse/QPID-8184
> Project: Qpid
> Issue Type: Bug
> Components: C++ Broker
> Reporter: Kim van der Riet
> Assignee: Kim van der Riet
> Priority: Major
>
> Some users are experiencing difficulty recovering the store, especially when
> there are a large number of queues (several thousand). The log files show
> the following pattern:
> {{JERR_EFP_BADEFPDIRNAME}} in which some arbitrary number which is not
> divisible by 4 is being used as the EFP file size (called EFP directory in
> the log), followed by a segfault:
> {noformat}
> May 4 18:55:00 prodrhs1l qpidd[6240]: 2018-05-04 18:55:00 [Store] warning
> Linear Store: EmptyFilePool create failed: jexception 0x0d03
> EmptyFilePool::fileSizeKbFromDirName() threw JERR_EFP_BADEFPDIRNAME: Bad
> Empty File Pool directory name (must be 'NNNk', where NNN is a number which
> is a multiple of 4) (Partition: 1; EFP directory: '9k')
> May 4 18:55:00 prodrhs1l kernel: qpidd[6240]: segfault at 10 ip
> 00007f4219af8e19 sp 00007ffc227a6350 error 4 in
> linearstore.so[7f4219ac4000+bd000]{noformat}
> In the event that the random number _is_ divisible by 4, a randomly sized
> directory containing no files may appear in the partition EFP.
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