Description of problem:

run `sadf -x` against specified sadd file dumped core due to segfault 

Version-Release number of selected component (if applicable):

sysstat-11.7.3-5.el8.x86_64

How reproducible:


Steps to Reproduce:

1.install sysstat package on a system with timezone UTC

# yum install sysstat
# date --set=16:00:00
Fri Dec 25 16:00:00 UTC 2020

2.start sysstat service, confirm /var/log/sa/sa25 is created

# systemctl start sysstat
# ls /var/log/sa/sa25
/var/log/sa/sa25

3.Before sysstat-collector.service starts for the first time,
run :

# sadf -x sa25 > sa25.xml
Segmentation fault (core dumped) <==

/var/log/messages:
~~~
sadf[8714]: segfault at 55c93f40afe0 ip 00007fbf5b60659a sp 00007ffcacc91c38 error 4 in libc-2.28.so[7fbf5b4a8000+1b9000]

Process 8714 (sadf) of user 0 dumped core.#012#012Stack trace of thread 8714:#012#0  0x00007fbf5b60659a __memmove_avx_unaligned_erms (libc.so.6)#012#1  0x000055c93daf45eb copy_structures (sadf)#012#2  0x000055c93dac141a logic1_display_loop (sadf)#012#3  0x000055c93dac1f4e read_stats_from_file (sadf)#012#4  0x000055c93dabf337 main (sadf)#012#5  0x00007fbf5b4cb873 __libc_start_main (libc.so.6)#012#6  0x000055c93dabfafe _start (sadf)
~~~

After sysstat-collector.service starts for the first time,
the issue doesn't happen again. 

4.However, if change timezone to Asia/Tokyo before sysstat-collector.service starts for the first time.

# timedatectl set-timezone Asia/Tokyo
# date
Sat Dec 26 01:01:48 JST 2020

At this time, sa26 is created, which has no problem. 
However, `sadf -x sa25` is executed when collecting sosreport, it dumps core during sosreport collection each time.

Actual results:

sadf segfault at 55f14d8e7fe0 ip 00007f61dabc859a sp 00007ffe1d4623c8 error 4 in libc-2.28.so

Expected results:

sadf doesn't dump core

Additional info: