On Mon, May 11, 2020 at 09:09:57AM +0800, kernel test robot wrote:
>     --- tests/btrfs/095.out	2020-04-09 10:45:28.000000000 +0800
>     +++ /lkp/benchmarks/xfstests/results//btrfs/095.out.bad	2020-05-06 21:13:51.276485703 +0800
>     @@ -1,35 +1,9 @@
>      QA output created by 095
>     -Blocks modified: [135 - 164]
>     -Blocks modified: [768 - 792]
>     +awk: line 19: function strtonum never defined
>     +awk: line 19: function strtonum never defined
>     +awk: line 19: function strtonum never defined
>     +awk: line 19: function strtonum never defined

This looks like a problem with the test setup.