Date: Mon, 22 Oct 2018 21:32:45 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: Andriy Gapon <avg@FreeBSD.org>, Glen Barber <gjb@freebsd.org> Cc: FreeBSD stable <freebsd-stable@freebsd.org> Subject: Re: krpc: unbootable ZFS-on-root after major upgrade to 11.2 Message-ID: <8b31ed45-eddb-e93e-57f6-4bc1387d18ff@grosbein.net> In-Reply-To: <c63c24f7-dc7f-785f-ea13-f4a9d7802114@FreeBSD.org> References: <8517429b-9e3b-2ea3-80a6-12fc92106252@grosbein.net> <6627d159-fd52-2d10-2d45-97fd02725adc@FreeBSD.org> <5BC9A2E4.9010306@grosbein.net> <6c2f8adb-c0e7-550b-8595-e7a4768d5157@FreeBSD.org> <f6249da6-db28-6672-5d4f-3e711e98f87e@grosbein.net> <20181022140304.GE13668@FreeBSD.org> <1d5236b8-0269-5dce-3f2e-e7b1910836c6@grosbein.net> <20181022141527.GF13668@FreeBSD.org> <c63c24f7-dc7f-785f-ea13-f4a9d7802114@FreeBSD.org>
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22.10.2018 21:21, Andriy Gapon wrote: >>>>> Glen, maybe that errata record should be deleted. The problem is real but it is long-standing >>>>> and present in 10.x too. >>>>> >>>> >>>> Could you elaborate more on the failure case you originally reported >>>> first? If the problem is real, my feeling is that the errata entry >>>> should stay, just worded differently to reflect the failure case here. >>> >>> zfs.ko depends on krpc.ko. The KRPC code in compiled in GENERIC kernel as dependency >>> of NFS client/server code. The problem arises if all of these are true: >>> >>> 1) a system uses custom kernel with NFS options removed; >>> 2) there is no krpc.ko available due to MODULES_OVERRIDE excluding it; >>> 3) the system boots off ZFS pool. >>> >>> In such case, loader cannot resolve dependency and fails to load zfs.ko >>> and kernel fails to mount root breaking boot sequence. >>> >>> >> >> So, if I understand correctly (and please correct me if I am wrong), the >> majority of the text in the errata note is correct, however needs to be >> tweaked to remove "upgrading from 10.x...". Is this generally correct? Yes. > This is just a typical foot-shooting (and a shortcoming of the kernel build > system that allows such foot-shooting to happen). > I think that there can be other ways in which you can specify inconsistent > kernel options and/or an incorrect subset of modules in MODULES_OVERRIDE to > create missing dependencies for critical modules. > Do we want to issue an errata for each possible misconfiguration? OTOH, we have option krpc in sys/conf/options but it is not mentioned elsewhere: not in the Handbook nor in the sys/conf/NOTES or GENERIC. Not a bit of our documentation mentions that ZFS requires KRPC for last 10 years. One can call it foot-shooting if it is against documentation but that's not the case.
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