[Bugs] [Bug 1235927] New: memory corruption in the way we maintain migration information in inodes.

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1235927

            Bug ID: 1235927
           Summary: memory corruption in the way we maintain migration
                    information in inodes.
           Product: GlusterFS
           Version: mainline
         Component: distribute
          Assignee: bugs at gluster.org
          Reporter: rgowdapp at redhat.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Description of problem:
In dht_migration_complete_check_task,

        ret = inode_ctx_reset1 (inode, this, &tmp_miginfo);
        if (tmp_miginfo) {
                GF_FREE (tmp_miginfo);
                goto out;
        }

However, another fop might be still using miginfo while we free it. The correct
way to solve this is to use refcounting mechanism of memory management.

Version-Release number of selected component (if applicable):


How reproducible:

Found through code-review. Its a race that can happen while doing parallel
operations on a file during migration. Since its a race, it might not be
reproducible consistently

Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:

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