Sometimes timers (rte_timer) do not expire

https://bugs.dpdk.org/show_bug.cgi?id=191

            Bug ID: 191
           Summary: Sometimes timers (rte_timer) do not expire
           Product: DPDK
           Version: 18.11
          Hardware: x86
                OS: Linux
            Status: CONFIRMED
          Severity: major
          Priority: Normal
         Component: other
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

Created attachment 24
--> https://bugs.dpdk.org/attachment.cgi?id=24&action=edit
sample timer program

Some timers do not expire as expected. Expiry time has passed and timer is still in state pending. Other timers installed after still expire as they should.

Attaching a small test program that installs timers on one core and has them expire on another to reproduce the fault.

A sample output from the program:

Installed 1000000 timers.
Warning: 4 timer(s) did not expire.

It might take a few runs to trigger the fault, and it might also be easier to trigger with a bit of background load on the machine.

Has been reproduced on 18.05 and 18.11

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