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Date:      Fri, 13 Mar 2015 21:38:01 +0100 (CET)
From:      Michael Fuckner <michael@fuckner.net>
To:        Chris H <bsd-lists@bsdforge.com>, Adrian Chadd <adrian@freebsd.org>
Cc:        "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Oliver Pinter <oliver.pinter@hardenedbsd.org>, freebsd-hardware@freebsd.org
Subject:   Re: Server with 3TB Crashing at boot
Message-ID:  <1037310890.395652.1426279081703.JavaMail.open-xchange@ptangptang.store>
In-Reply-To: <72adbbf534c673c111c0b8cec018318b@ultimatedns.net>
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> Chris H <bsd-lists@bsdforge.com> hat am 13. M=C3=A4rz 2015 um 21:28 gesch=
rieben:
>
>
> On Fri, 13 Mar 2015 20:49:44 +0100 (CET) Michael Fuckner <michael@fuckner=
.net>
> wrote
>
> > > Adrian Chadd <adrian@freebsd.org> hat am 13. M=C3=A4rz 2015 um 19:02
> > > geschrieben:
> >
> > Hi!
> >
> > > boot_verbose=3DYES looks to be right.
> >
> > root@s4l:~ # grep verbose /boot/defaults/loader.conf
> > verbose_loading=3D"NO" # Set to YES for verbose loader output
> >
> > OK, this confused me :-(
> In case it's still not clear:
> The values your copy of loader.conf located as /boot/loader.conf
> overrides the values set in /boot/defaults/loader.conf
>=20
that is clear to me, but I was confused by verbose_loading vs boot_verbose
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Date: Fri, 13 Mar 2015 21:42:04 +0100 (CET)
From: Michael Fuckner <michael@fuckner.net>
Reply-To: Michael Fuckner <michael@fuckner.net>
To: Steven Hartland <killing@multiplay.co.uk>, Ryan Stone <rysto32@gmail.com>
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Subject: Re: Server with 3TB Crashing at boot
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> Ryan Stone <rysto32@gmail.com> hat am 13. M=C3=A4rz 2015 um 20:40 geschri=
eben:
>
>
> On Fri, Mar 13, 2015 at 2:27 PM, Steven Hartland <killing@multiplay.co.uk=
>
> wrote:
>
> > Looks like that's panicing when allocating the zfs dbuf hash table, whi=
ch
> > by my calculation should be requesting 8GB for a 4TB physmem?
> >
>
> Interesting observation. Michael, can you try booting with this patch
> applied? There is a bug in the kernel when we attempt to malloc() more
> than 4GB.
>
> https://people.freebsd.org/~rstone/patches/vm_64bit_malloc.diff
Now I can kldload zfs without exploding kernel. I'll do some more tests
tomorrow, but this looks fine!
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Subject: Re: Server with 3TB Crashing at boot
From: Ryan Stone <rysto32@gmail.com>
To: Michael Fuckner <michael@fuckner.net>
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On Fri, Mar 13, 2015 at 4:42 PM, Michael Fuckner <michael@fuckner.net>
wrote:

>   Now I can kldload zfs without exploding kernel. I'll do some more tests
> tomorrow, but this looks fine!
>

Excellent news!  I'd be interested to know whether this fixes the panics
that you saw when zfs.ko was loaded by the bootloader.  It's definitely
possible, as the symptoms of this bug are likely to be random memory
corruption after zfs initializes, but your crash happened pretty early on
and I'm not sure whether zfs would have had a chance to do anything that
early.

Thanks for all of the work that you did to debug this.



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