[Bugs] [Bug 1527699] New: rdma transport may access an obsolete item in gf_rdma_device_t->all_mr, and causes glusterfsd/glusterfs process crash.

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1527699

            Bug ID: 1527699
           Summary: rdma transport may access an obsolete item in
                    gf_rdma_device_t->all_mr, and causes
                    glusterfsd/glusterfs process crash.
           Product: GlusterFS
           Version: 3.13
         Component: rdma
          Keywords: Bugfix
          Severity: urgent
          Assignee: bugs at gluster.org
          Reporter: srangana at redhat.com
                CC: bugs at gluster.org, rkavunga at redhat.com,
                    wangyi at storswift.com
        Depends On: 1522651



+++ This bug was initially created as a clone of Bug #1522651 +++

Description of problem:
        In the rdma.c file, gf_rdma_device_t->all_mr is a
__gf_rdma_arena_mr(include RDMA Memory Region(MR) content) kind of list in the
rdma rpc-transport.
        The rdma rpc-transport will add/delete items to the
gf_rdma_device_t->all_mr when MRs register, deregister, and free.
        Because gf_rdma_device_t->all_mr is used by different threads and it is
not mutex protected, rdma transport maybe access obsolete items in it.

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


How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:
        At a heavy condition, the items in the gf_rdma_device_t->all_mr should
be released by threads. As a result, glusterfsd/glusterfs process will crash.

Expected results:
        gf_rdma_device_t->all_mr must be mutex protected.

Additional info:
        None


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1522651
[Bug 1522651] rdma transport may access an obsolete item in
gf_rdma_device_t->all_mr, and causes glusterfsd/glusterfs process crash.
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