On Fri, 4 Sep 2020, Mikulas Patocka wrote: > Hmm, so I've found another bug in dax mode. > > If you extract the Linux kernel tree on dax-based ext2 filesystem (use the > real ext2 driver, not ext4), and then you run make twice, the second > invocation will rebuild everything. It seems like a problem with > timestamps. > > mount -t ext2 -o dax /dev/pmem0 /mnt/ext2/ > cd /mnt/ext2/usr/src/git/linux-2.6 > make clean > make -j12 > make -j12 <--- this rebuilds the whole tree, althought it shouldn't > > I wasn't able to bisect it because this bug seems to be present in every > kernel I tried (back to 4.16.0). Ext4 doesn't seem to have this bug. > > Mikulas I've found out the root cause for this bug (XFS has it too) and I'm sending patches. Mikulas
