[dm-devel] fuzzing bcachefs with dm-flakey
Matthew Wilcox
willy at infradead.org
Mon May 29 21:14:51 UTC 2023
On Mon, May 29, 2023 at 04:59:40PM -0400, Mikulas Patocka wrote:
> Hi
>
> I improved the dm-flakey device mapper target, so that it can do random
> corruption of read and write bios - I uploaded it here:
> https://people.redhat.com/~mpatocka/testcases/bcachefs/dm-flakey.c
>
> I set up dm-flakey, so that it corrupts 10% of read bios and 10% of write
> bios with this command:
> dmsetup create flakey --table "0 `blockdev --getsize /dev/ram0` flakey /dev/ram0 0 0 1 4 random_write_corrupt 100000000 random_read_corrupt 100000000"
I'm not suggesting that any of the bugs you've found are invalid, but 10%
seems really high. Is it reasonable to expect any filesystem to cope
with that level of broken hardware? Can any of our existing ones cope
with that level of flakiness? I mean, I've got some pretty shoddy USB
cables, but ...
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