For those interrested in the matter, actual info on the issue can be found here: https://bugzilla.redhat.com/show_bug.cgi?id=1708315 Bottomline is that it seems like using the cache device specifically results in data corruption. On Mon, May 13, 2019 at 12:49 PM Rolf Fokkens <rolf@xxxxxxxxxxxxxx> wrote: > > For those interrested in the matter, actual info on the issue can be found here: https://bugzilla.redhat.com/show_bug.cgi?id=1708315 > > Bottomline is that it seems like using the cache device specifically results in data corruption. > > On Thu, May 9, 2019 at 7:21 PM Rolf Fokkens <rolf@xxxxxxxxxxxxxx> wrote: >> >> Hi, >> >> The reproducability is 100%. It's enough to only upgrade to a Fedora 30 >> kernel on a Fedora 29 system. The next reboot will probably be the last >> reboot ever. >> >> My Fedora bug report is here: >> >> If it's gcc9 related, the cause may be somewhere between "Fedora's >> decision to use gcc9" and "bcache needing a fix". >> >> Rolf >> >> On 5/6/19 7:45 PM, Rolf Fokkens wrote: >> > >> > Hi, >> > >> > I helped in 2013 to get bcache-tools integrated in Fedora 21 >> > (https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx/thread/UEGAUSP377TB3KMUO7XK42KREHOUDZPG/). >> > >> > Ever since it worked like a charm, and bcache laptops (we have several >> > at work) survived upgrading to a next Fedora release flawlessly. Since >> > Fedora 30 this has changed however: laptops using bcache mess up >> > backing store big time. It seems as if the backing device is corrupted >> > by random writes all over the place. It's hard to narrow down the >> > cause of this issue, and I'm still in the process of trial and error. >> > May be later on I'll have more info. >> > >> > Some info: >> > >> > * The laptops are using writeback caching >> > * The laptops have a bcache'd root file system >> > * It seems like the issue is in the Fedora kernel 5.0.10 for Fedora >> > 30, but not kernel 5.0.10 for Fedora 29. >> > * One notable difference between the Fedora 29 and Fedora 30 kernels >> > is that Fedora 30 uses gcc 9 to build the kernel. >> > >> > As mentioned i'm still in the process of narrowing down the cause of >> > the issue. But any suggestions are welcome. >> > >> > Rolf >> > >>
