[Bug 996] PDK:20.11.1: net/ena crash while fetching xstats

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=996

            Bug ID: 996
           Summary: PDK:20.11.1: net/ena crash while fetching xstats
           Product: DPDK
           Version: 20.11
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: ethdev
          Assignee: dev at dpdk.org
          Reporter: amohakud at paloaltonetworks.com
  Target Milestone: ---

I am facing one issue in net/ena driver while fetching extended stats (xstats).
The DPDK seems to segfault with below backtrace. 

DPDK Version: 20.11.1
ENA version: 2.2.1


Using host libthread_db library "/lib64/libthread_db.so.1".

Core was generated by `/opt/dpfs/usr/local/bin/brdagent'.

Program terminated with signal SIGSEGV, Segmentation fault.

#0  __memmove_avx_unaligned_erms () at
../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:232

232             VMOVU   %VEC(0), (%rdi)

[Current thread is 1 (Thread 0x7fffed93a400 (LWP 5060))]



Thread 1 (Thread 0x7fffed93a400 (LWP 5060)):

#0  __memmove_avx_unaligned_erms () at
../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:232

#1  0x00007ffff3c246df in ena_com_handle_admin_completion () from
../lib64/../../lib64/libdpdk.so.20

#2  0x00007ffff3c1e7f5 in ena_interrupt_handler_rte () from
../lib64/../../lib64/libdpdk.so.20

#3  0x00007ffff3519902 in eal_intr_thread_main () from
/../lib64/../../lib64/libdpdk.so.20

#4  0x00007ffff510714a in start_thread (arg=<optimized out>) at
pthread_create.c:479

#5  0x00007ffff561ff23 in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95







Background:

This used to work fine with DPDK-19.11.3 , that means there was no crash
observed with the 19.11.3 DPDK version, but now after upgrading to DPDK
20.11.1, DPDK is crashing with the above trace. It looks to me as a DPDK issue.

I could see multiple fixes/patches in the net/ena area, but not able to
identify which patch would exactly fix this issue.

For example:
http://git.dpdk.org/dpdk/diff/?h=releases&id=aab58857330bb4bd03f6699bf1ee716f72993774
https://inbox.dpdk.org/dev/20210430125725.28796-6-mk@semihalf.com/T/#me99457c706718bb236d1fd8006ee7a0319ce76fc


Could you please help here and let me know what patch could fix this issue.

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