[jira] [Created] (KUDU-2721) CHECK can be hit when there are gaps in present CPU numbers

["Tim Armstrong (JIRA)" <ji...@apache.org>]

Tim Armstrong created KUDU-2721:
-----------------------------------

             Summary: CHECK can be hit when there are gaps in present CPU numbers
                 Key: KUDU-2721
                 URL: https://issues.apache.org/jira/browse/KUDU-2721
             Project: Kudu
          Issue Type: Bug
    Affects Versions: 1.8.0
         Environment: SLES12-SP3
            Reporter: Tim Armstrong
         Attachments: cpus.cc

We saw a case where Impala is crashing in the Kudu client and it seems to be because the "present" string can have multiple ranges in it - "0-15,32-47\n" in this case.  See https://github.com/apache/kudu/blob/148a0c7bec6554724339a2235cbd723fb74be339/src/kudu/gutil/sysinfo.cc#L177

I've attached a small test program based on the code illustrating that the assert gets hit.

I think we should figure out all of the possible formats for the present string and make sure we handle them. Or figure out a different way to get equivalent info.

A workaround for the case that we saw was to disable hyperthreading, which changed the string to being a single range.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)