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 ...
