Hi Matthew, Commit b4678df184b: "errseq: Always report a writeback error once" appears to be causing xfstests regressions. For ext4, running "gce-xfstests -c 4k -g auto" will result in reliable shared/298 failures which go away if I revert b4678df184b. Darrick has also reported occasional generic/047 failures, which I have seen at least once as well. I believe two are linked, because after instrumenting mke2fs in shared/298, the failure is happening after creating a new 300 MB file: dd if=/dev/zero of=$img_file bs=1M count=300 &> /dev/null creating a new loop device loop_dev=$(_create_loop_device $img_file) ... and then run mke2fs on that loop device. The instrumentation of mke2fs shows that the first fsync() on /dev/loop0 (in lib/ext2fs/closefs.c) which is failing with EIO. I haven't had a chance to really drill down on it, but I think what is going on is there is some former test which exercises an error path (using dm_error, or some such), and somehow the errseq_t for the loop device isn't getting reset, or the inode for the underlying backing file, had an unitialized errseq_t. Can you take a closer look at this? Thanks, - Ted
