[Bug 208805] databases/mysql57-server: SIGSEGV when doing binary upgrade from databases/mysql56-server

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208805

            Bug ID: 208805
           Summary: databases/mysql57-server: SIGSEGV when doing binary
                    upgrade from databases/mysql56-server
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: fredrik.eriksson at loopia.se
                CC: ale at FreeBSD.org, mokhi64 at gmail.com
                CC: ale at FreeBSD.org, mokhi64 at gmail.com

Created attachment 169316
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=169316&action=edit
backtrace of crash

I've encountered this bug on two servers when testing binary upgrades from
5.6.27 to 5.7.10. Each server has 9500+ databases with 200GB+ worth of data.

mysqld crashes with a segfault after a while when running mysql_upgrade or
mysqlcheck --check-upgrade. I can reproduce it every time, and it seems like it
happens after X number of databases/tables/GB since it usually crashes around
the same database.

I've attached a backtrace (that I got using gdb and mysql with debugging
symbols). I think this is an upstream bug, but I start here since I've only
tested it on FreeBSD (and 5.7.10 is not the latest upstream version).

Let me know if there is something more I should test.

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