Date: Wed, 12 Jul 2017 13:20:55 -0700 From: Peter Wemm <peter@wemm.org> To: Current <current@freebsd.org> Subject: Caveat emptor: Beware of ZFS on HEAD Message-ID: <2830123.MIUbdsJfkU@overcee.wemm.org>
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[-- Attachment #1 --] We mostly run HEAD in the freebsd.org cluster. Sometime in the last few weeks an ugly zfs problem has surfaced. If a redundant volume is degraded, zfs panics on boot. If a drive fails while running, or is manually put offline, zfs panics the same way. I do not have a smoking gun, but I am suspicious of the June 28th commits (starting at r320156) and their follow-ups. eg: r320452. https://bugs.freebsd.org/220691 I believe single disk systems will *not* be affected by this - the panic only happens when a raidz (and presumably mirror) degrades. Your laptop etc should be fine. I apologize for being vague - I do not know more. Folks running HEAD should take appropritate precautions (eg: keeping a known-good kernel.old and modules around). This is always advisable when running HEAD anyway, particularly so now. For us, a kernel.old from June 18th worked fine. -- Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com; KI6FJV UTF-8: for when a ' or ... just won\342\200\231t do\342\200\246 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEBgrA0Vr/vfNVuPoUNdaXCeyAngQFAllmhKcACgkQNdaXCeyA ngQbVwgAwFUY7+xntVLNfUgK3SchTvxkDCMXO0YecLmdFHCtWSeuxpvV+EUJoOs7 hnZXy7IxRTh92F9g3dRh4M9ifsgE7ubgD/o/vcDR0uprsBQVEUECTaVL9sTRwm6A 9eyVKHnfiB3YmT7GdQCW45zyYotXLJ6vDb4m322V8tgonMv9k1lmIqQfYy6tpFyO YOwlVWBEc+9XcjQIys5t0ZkNinzv0wP+rv89fYBRsx1W4byY33oi6KikQ2ccT7VB eBM509hLoaFlSgcxIe+kZ6pssMAEqhQ+ADD7uggnTMylnxNwH0zflV0u42jOZiQX 1aCc10De/RvTfj4jFXCFRfxFV4qptw== =XwTW -----END PGP SIGNATURE-----
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