[DPDK/core Bug 1944] Crash due to corruption from data race in page prefault in alloc_seg()

[DPDK/core Bug 1944] Crash due to corruption from data race in page prefault in alloc_seg()

[bugzilla]

http://bugs.dpdk.org/show_bug.cgi?id=1944

            Bug ID: 1944
           Summary: Crash due to corruption from data race in page
                    prefault in alloc_seg()
           Product: DPDK
           Version: 24.11
          Hardware: All
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: dev@dpdk.org
          Reporter: michal.sieron@nokia.com
  Target Milestone: ---

Hi, recently we caught a data corruption seemingly caused by a page prefault in
`alloc_seg()` function from `lib/eal/linux/eal_memalloc.c`:
> *(volatile int *)addr = *(volatile int *)addr;

Internal investigation showed that `rte_eal_init()` from a secondary process
was indirectly calling this function, which in rare cases led to data
corruption.
In our case it resulted in a scheduler crash:
> EAL: PANIC in eth_event_queue_callback():
> Cannot restart RxQ(p:1,q:0) after max trying times 4, abort!

The issue is reported for v24.11, but I don't think it is tied to this specific
version and is a general problem since that prefault was added in v18.05.

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