As discussed in this week's ext4 concall, I'm seeing a regression for generic/347 in the data=journal test case when running xfstests-bld on 4.17. The test fails with the following output: QA output created by 347 +/sbin/e2fsck: Unknown code ____ 251 while recovering journal of /dev/mapper/thin-vol The failure bisects to: errseq: Always report a writeback error once (b4678df184b3) This patch landed in v4.17-rc4. When it's reverted in v4.17, it's no longer possible to reproduce the error. Thanks, Eric