[dpdk-dev] [Bug 447] ixgbe: ixgbe_dev_link_update_share() leaks memory and memory mappings due to not cleaning up pthreads

[dpdk-dev] [Bug 447] ixgbe: ixgbe_dev_link_update_share() leaks memory and memory mappings due to not cleaning up pthreads

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=447

            Bug ID: 447
           Summary: ixgbe: ixgbe_dev_link_update_share() leaks memory and
                    memory mappings due to not cleaning up pthreads
           Product: DPDK
           Version: 20.02
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: martin.weiser@allegro-packets.com
  Target Milestone: ---

In the patch "net/ixgbe: fix blocking system events"
(819d0d1d57f17aa40321648e99a50b49adc7bdf6) a thread is introduced to
run ixgbe_dev_setup_link_thread_handler().
Unfortunately this thread is not detached and just joined (the very
last one spawned that is) through ixgbe_dev_cancel_link_thread() upon
interface start/stop.

When an application repeatedly calls e.g. rte_eth_link_get_nowait() on
an ixgbe interface with no link this causes a lot of pthreads never to
be cleaned up.
Since each thread holds a mmap to the stack this can quite quickly
exhaust the allowed number of memory mappings for the process.

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