Date: Thu, 23 Jul 2015 17:14:27 -0700 From: "Chris H" <bsd-lists@bsdforge.com> To: <freebsd-stable@freebsd.org> Subject: Re: 10.2-Beta i386..what's wrong..? Message-ID: <5b6f2cf186cc3ba5b968316049714f9f@ultimatedns.net> In-Reply-To: <20150723234805.GK84931@FreeBSD.org> References: <55B17B7A.4080402@gmail.com>, <20150723234805.GK84931@FreeBSD.org>
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On Thu, 23 Jul 2015 23:48:06 +0000 Glen Barber <gjb@FreeBSD.org> wrote > On Thu, Jul 23, 2015 at 07:40:42PM -0400, Jason Unovitch wrote: > > >> ..uh top quoting.. > > >> > > >> Trying to mount root from zfs:zroot/ROOT/default []. > > >> > > >> Fatal double fault: > > >> eip = 0xc0b416f5 > > >> esp = 0xe2673000 > > >> ebp = 0xe2673008 > > >> cpuid =0; apic id = 00 > > >> panic: double fault > > >> cpuid = 0 > > >> KDB stack backtrace: > > >> #0 0xc0b72832 at kdb_backtrace+0x52 > > >> #1 0xc0b339cb at vpanic+0x11b > > >> #2 0xc0b338ab at panic+0x1b > > >> #3 0xc10556 at dblfault_handler+0xab > > >> Uptime: 11s > > >> .. > > > > > >Looks like the panic I received on my Soekris Net6501-70. > > > > > >Fixed in stable/10 in r285759: > > >https://svnweb.freebsd.org/changeset/base/285759 > > > > > >Fixed in stable/9 in r285760: > > >https://svnweb.freebsd.org/changeset/base/285760 > > > > > > > Herbert, in https://bugs.FreeBSD.org/201642 I had tracked down the commit > > that caused the issue on our Soekris 6501s. Only between r284297 -> > > r285662 in HEAD and between r284998 -> r285756 in stable/10 should be > > affected. > > >>>Ok, it is 10.2-BETA so I've tried 10.1-Release next...exactly the same, > > >>>ok tried 9.3-RELEASE .. the same! > > > > Holm, if you are seeing this on 9.3-RELEASE and 10.1-RELEASE I'm not > > entirely convinced the cause is the same. > > > > ZFS on i386 requires KSTACK_PAGES=4 in the kernel configuration to work > properly, as noted in the 10.1-RELEASE errata (and release notes, if > I remember correctly). > > We cannot set KSTACK_PAGES=4 in GENERIC by default, as it is too > disruptive. If you are using ZFS on i386, you *must* build your own > kernel for this. It is otherwise unsupported by default. Shouldn't there be a GENERIC kernel with the KSTACK_PAGES=4 option defined, available? Maybe with one of the bootonly MEMSTICKS, or something? I know, it's (mostly) crazy to attempt ZFS on an i386. But it's pretty difficult for someone on 8.x to build a 9.x, or 10.x kernel. If all they've got is i386 hardware. Just a thought. --Chris > > Glen
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