2) stress-ng --class filesystem,io
Compared the stress-ng output and kernel log between original/patched kernels.
No regressions.
Actually, in Bionic the original kernel didn't even finish stress-ng in ~20
hours, while the patched kernel finished it in ~1.5 hours (in line w/ other the
releases.)
Thus it's apparently an improvement.
For documentation purposes, this seems to be due to the 'fiemap'
stressor in the 'filesystem' class, which had defunct processes when I
checked before cancelling the tests:
$ ps axf
...
2659 ? Ss 0:00 tmux new
2661 pts/2 Ss 0:00 \_ -bash
2692 pts/2 S+ 0:00 | \_ /bin/sh ./run-stressng.sh
2743 pts/2 S+ 0:00 | \_ sudo stress-ng --sequential 2
--class filesystem,io -t 2m
2745 pts/2 SL+ 0:00 | \_ stress-ng --sequential 2
--class filesystem io -t 2m
2852 pts/2 D+ 0:00 | \_ stress-ng --sequential 2
--class filesystem io -t 2m
2854 pts/2 D+ 0:01 | | \_ stress-ng
--sequential 2 --class filesystem io -t 2m
2856 pts/2 D+ 0:01 | | \_ stress-ng
--sequential 2 --class filesystem io -t 2m
2859 pts/2 D+ 0:01 | | \_ stress-ng
--sequential 2 --class filesystem io -t 2m
2860 pts/2 D+ 0:01 | | \_ stress-ng
--sequential 2 --class filesystem io -t 2m
2853 pts/2 D+ 0:00 | \_ stress-ng --sequential 2
--class filesystem io -t 2m
2855 pts/2 Z+ 322:29 | \_ [stress-ng-fiema]
<defunct>
2857 pts/2 Z+ 323:55 | \_ [stress-ng-fiema]
<defunct>
2858 pts/2 Z+ 321:50 | \_ [stress-ng-fiema]
<defunct>
2861 pts/2 Z+ 322:51 | \_ [stress-ng-fiema]
<defunct>
11823 pts/4 Ss 0:00 \_ -bash
...
** Bug watch added: Linux Kernel Bug Tracker #202833
https://bugzilla.kernel.org/show_bug.cgi?id=202833
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https://bugs.launchpad.net/bugs/1902254
Title:
Bionic: btrfs: kernel BUG at /build/linux-
eTBZpZ/linux-4.15.0/fs/btrfs/ctree.c:3233!
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