awk:fatal:cannot_open_file`page_slab'for_reading(No_such_file_or_directory)

[zhoujie2022]

The error is because of multiple shell run at the same time.

normal process is
-> create file(cnt=page-types -Nl -b $1 | tee page_$1 | wc -l) -> get value(page=awk -v line=${rand} 'NR == line {print $1}' page_$1) -> remove file(rm -f page_$1)

but the real is
->thread 1 create page_slab -> thread 2 create page_slab -> thread 1 get value -> thread 1 remove page_slab -> thread 2 get value -> awk:fatal:cannot_open_file`page_slab'for_reading(No_such_file_or_directory)

In pfa/inject:
function get_free_page()
{
local rand=0
cnt=page-types -Nl -b $1 | tee page_$1 | wc -l
if [ $cnt -gt 1 ]; then
rand=$(expr $RANDOM % $cnt + 1)
if [ ${rand} -eq 1 ]; then
# skip the title line of output
((rand++))
fi
page=awk -v line=${rand} 'NR == line {print $1}' page_$1
echo 0x${page}
else
echo 0
fi
rm -f page_$1
}

Change the mce-log/tests/test to do test at one time, and the result is OK.
diff test_org test
49c49
< ./inject $conf &

./inject $conf

./test pfa ""
++++++++++++ running pfa test +++++++++++++++++++
mcelog: no process found
+++ start the injection for page-account.conf +++
inject for page type slab at physical address 0x817c87000 [ NO. 0 ]
inject for page type slab at physical address 0x817c87000 [ NO. 1 ]
+++ start the injection for page-hard.conf +++
inject for page type slab at physical address 0x183319000 [ NO. 0 ]
inject for page type slab at physical address 0x183319000 [ NO. 1 ]
+++ start the injection for page-soft-then-hard.conf +++
inject for page type slab at physical address 0x241c53000 [ NO. 0 ]
+++ start the injection for page-soft.conf +++
inject for page type slab at physical address 0x818a35000 [ NO. 0 ]
inject for page type slab at physical address 0x818a35000 [ NO. 1 ]

./test_org pfa ""
++++++++++++ running pfa test +++++++++++++++++++
mcelog: no process found
+++ start the injection for page-account.conf +++
inject for page type slab at physical address 0x1351c0000 [ NO. 0 ]
inject for page type slab at physical address 0x1351c0000 [ NO. 1 ]
+++ start the injection for page-hard.conf +++
+++ start the injection for page-soft-then-hard.conf +++
inject for page type slab at physical address 0x102788000 [ NO. 0 ]
inject for page type slab at physical address 0x102788000 [ NO. 1 ]
awk: fatal: cannot open file page_slab' for reading (No such file or directory) inject for page type slab at physical address 0x000 [ NO. 0 ] ../../input/GENPAGE: line 15: printf: 0x: invalid hex number ../../input/GENPAGE: line 23: printf: 0x: invalid hex number +++ start the injection for page-soft.conf +++ root@lkp-skl-d05 /lkp/benchmarks/mce-log/tests# awk: fatal: cannot open file page_buddy' for reading (No such file or directory)
inject for page type slab at physical address 0x1a0ee6000 [ NO. 0 ]
inject for page type slab at physical address 0x1a0ee6000 [ NO. 1 ]