Date: Fri, 21 Jun 2019 14:27:09 -0600 From: Scott Long <scottl@samsco.org> To: Alan Somers <asomers@freebsd.org>, Chuck Silvers <chs@netflix.com>, Kirk McKusick <mckusick@mckusick.com> Cc: FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: Reducing UFS corruption from unclean shutdowns? Message-ID: <F93827F6-1B99-4BDD-B245-C9594AD28ED7@samsco.org> In-Reply-To: <CAOtMX2jXiaOWpVdEg3_nBYinJWd=iwN_38hQ4eMOocgs8dMWhQ@mail.gmail.com> References: <CAOtMX2jPut4ve-Tr7DyikxXqnmqycyjEUpNmAiwUSXbQrK3iCA@mail.gmail.com> <C3016BDF-4B51-4A59-94F2-CCBD0DC4562E@samsco.org> <CAOtMX2jXiaOWpVdEg3_nBYinJWd=iwN_38hQ4eMOocgs8dMWhQ@mail.gmail.com>
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> On Jun 21, 2019, at 2:09 PM, Alan Somers <asomers@freebsd.org> wrote: > > On Fri, Jun 21, 2019 at 1:56 PM Scott Long <scottl@samsco.org> wrote: >> >> >> >>> On Jun 21, 2019, at 1:49 PM, Alan Somers <asomers@freebsd.org> wrote: >>> >>> I panic my development VM regularly. Each time, I need to fsck the >>> file system. Even if I had run sync(8) just before the panic, I >>> frequently find corruption. What should I change to make sync(8) >>> work, or at least to make corruption rare? It looks like my root file >>> system is using soft-updates+journal. Should I disable those? >>> >> >> What corruption do you regularly see? >> >> Scott > > fsck reports various types of errors, all repairable, like "INODE > CHECK-HASH FAILED", "FREE BLK COUNT(S) WRONG IN SUPERBLK", "SUMMARY > INFORMATION BAD", "BLK(S) MISSING IN BIT MAPS", and "UNREF FILE". If > I don't run fsck, then I get errors when I try to access files. Like > "inode XXX: check-hash failed" and "such and such is marked as an > executable file but could not be run by the operating system". > -Alan The freeblk count and summary information messages are normal and expected. I don’t think that the blks missing message is expected, and the unref file message is definitely a red flag of something that should have been handed with journal recovery. Kirk and Chuck, do you have any insight here? Thanks, Scott
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