Mike Snitzer <snitzer@xxxxxxxxxx> writes: > On Thu, Nov 20 2014 at 3:30pm -0500, > Michael S. Tsirkin <mst@xxxxxxxxxx> wrote: > >> On Thu, Nov 20, 2014 at 02:00:59PM -0500, Mike Snitzer wrote: >> > virtio_blk incorrectly established -1U as the default for these >> > queue_limits. Set these limits to sane default values to avoid crashing >> > the kernel. > ... >> > Attempting to mkfs.xfs against a thin device from this thin-pool quickly >> > resulted in fs/direct-io.c:dio_send_cur_page()'s BUG_ON. >> >> Why exactly does it BUG_ON? >> Did some memory allocation fail? > > No idea, kernel log doesn't say.. all it has is "kernel BUG" pointing to > fs/direct-io.c:dio_send_cur_page()'s BUG_ON. > > I could dig deeper on _why_ but honestly, there really isn't much point. There is *always* a point in understanding the code you are modifying. > virtio-blk doesn't get to live in fantasy-land just because it happens > to think it is limitless. Calm down please. We don't have a sector limit. We have a segment limit, which is set above this line. Cheers, Rusty. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
