Re: fuzzing bcachefs with dm-flakey

[Mikulas Patocka <mpatocka@redhat.com>]

On Thu, 1 Jun 2023, Darrick J. Wong wrote:

> On Mon, May 29, 2023 at 04:59:40PM -0400, Mikulas Patocka wrote:
>
> > #!/bin/sh -ex
> > umount /mnt/test || true
> > dmsetup remove_all || true
> > rmmod brd || true
> > SRC=/usr/src/git/bcachefs-tools
> > while true; do
> >         modprobe brd rd_size=1048576
> >         bcachefs format --replicas=2 /dev/ram0 /dev/ram1
> >         dmsetup create flakey --table "0 `blockdev --getsize /dev/ram0` linear /dev/ram0 0"
> >         mount -t bcachefs /dev/mapper/flakey:/dev/ram1 /mnt/test
> >         dmsetup load flakey --table "0 `blockdev --getsize /dev/ram0` flakey /dev/ram0 0 0 1 4 random_write_corrupt 100000000 random_read_corrupt 100000000"
> 
> Hey, that's really neat!
> 
> Any chance you'd be willing to get the dm-flakey changes merged into
> upstream so that someone can write a recoveryloop fstest to test all the
> filesystems systematically?
> 
> :D
> 
> --D

Yes, we will merge improved dm-flakey in the next merge window.

Mikulas