DPDK:20.11.1: net/ena crash while fetching xstats

[Amiya Mohakud]

Hi Michal/DPDK-Experts,

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.


Regards
Amiya
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