[Bugs] [Bug 1423373] New: Crash in index xlator because of race in inode_ctx_set and inode_ref

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1423373

            Bug ID: 1423373
           Summary: Crash in index xlator because of race in inode_ctx_set
                    and inode_ref
           Product: GlusterFS
           Version: mainline
         Component: libglusterfsclient
          Assignee: bugs at gluster.org
          Reporter: pgurusid at redhat.com
                CC: bugs at gluster.org



Description of problem:
Some regression test cases in afr were failing because of this bug.

RCA:
    Currently inode ref count is gaurded by inode_table->lock, and
    inode_ctx is gauarded by inode->lock. With the new patch [1]
    inode_ref was modified to change the inode_ctx to track the ref
    count per xlator. Thus inode_ref performed under inode_table->lock
    is modifying inode_ctx which has to be modified only under inode->lock

Solution:
    When a inode is created, inode_ctx holder is allocated for all the xlators.
    Hence in case of inode_ctx_set instead of using the first free index in
    inode ctx holder, we can have predecided index for every xlator in the
graph.



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


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