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Date:      Fri, 30 Aug 2013 01:17:18 -0700
From:      Patrick <gibblertron@gmail.com>
To:        freebsd-hackers@freebsd.org
Subject:   Re: Fatal trap 12 going from 8.2 to 8.4 with ZFS
Message-ID:  <CA%2BdWbmbHKqvR%2BAwVpKe1QPf6HzKj4dcx3j-sOGLThgo_9kQWXQ@mail.gmail.com>
In-Reply-To: <521FBE05.6020007@FreeBSD.org>
References:  <CA%2BdWbmYhXubU23XY4vCvfYA4MNrEOCSGCDTm2s7wF_NB1pktOA@mail.gmail.com> <521FBE05.6020007@FreeBSD.org>

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On Thu, Aug 29, 2013 at 2:32 PM, Andriy Gapon <avg@freebsd.org> wrote:
> on 29/08/2013 19:37 Patrick said the following:
>> I've got a system running on a VPS that I'm trying to upgrade from 8.2
>> to 8.4. It has a ZFS root. After booting the new kernel, I get:
>>
>> Fatal trap 12: page fault while in kernel mode
>> cpuid = 0; apic id = 00
>> fault virtual address   = 0x40
>> fault code              = supervisor read data, page not present
>> instruction pointer     = 0x20:0xffffffff810d7691
>> stack pointer           = 0x28:0xffffff800001ba60
>> frame pointer           = 0x28:0xffffff800001ba90
>> code segment            = base 0x0, limit 0xfffff, type 0x1b
>>                         = DPL 0, pres 1, long 1, def32 0, gran 1
>> processor eflags        = interrupt enabled, resume, IOPL = 0
>> current process         = 1 (kernel)
>> trap number             = 12
>> panic: page fault
>> cpuid = 0
>> KDB: stack backtrace:
>> #0 0xffffffff8066cb96 at kdb_backtrace+0x66
>> #1 0xffffffff8063925e at panic+0x1ce
>> #2 0xffffffff809c21d0 at trap_fatal+0x290
>> #3 0xffffffff809c255e at trap_pfault+0x23e
>> #4 0xffffffff809c2a2e at trap+0x3ce
>> #5 0xffffffff809a9624 at calltrap+0x8
>> #6 0xffffffff810df517 at vdev_mirror_child_select+0x67
>
> If possible, please run 'kgdb /path/to/8.4/kernel' and then in kgdb do 'list
> *vdev_mirror_child_select+0x67'

Hmmmm...

(kgdb) list *vdev_mirror_child_select+0x67
No symbol table is loaded.  Use the "file" command.

Do I need to build the kernel from source myself? This kernel is what
freebsd-update installed during part 1 of the upgrade.

Patrick



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