[LU-15979] writing client eviction due to mds failover

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Severity: 3
• Assignee: Vladimir Saveliev
• Reporter: Vladimir Saveliev

Description

This is another scenario for LU-12347 not covered by https://review.whamcloud.com/44151

    cl_io_loop
      cl_io_lock                    <- ldlm lock is taken here
      cl_io_start
        vvp_io_write_start
        ...
          __generic_file_aio_write
            file_remove_privs
              security_inode_need_killpriv
              ...
                ll_xattr_get_common
                ...
                  mdc_intent_lock   <- enqueue rpc is sent here
      cl_io_unlock                  <- ldlm lock is released

    If enqueue rpc is delayed, the client may get evicted as not
    cancelling lock taken in cl_io_lock.