Fatal trap 12 after upgrading from 8.2 to 8.4

Patrick gibblertron at gmail.com
Tue Aug 27 18:36:29 UTC 2013

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
#7 0xffffffff810dfacc at vdev_mirror_io_start+0x24c
#8 0xffffffff810f7c52 at zio_vdev_io_start+0x232
#9 0xffffffff810f76f3 at zio_execute+0xc3
#10 0xffffffff810f77ad at zio_wait+0x2d
#11 0xffffffff8108991e at arc_read+0x6ce
#12 0xffffffff8109d9d4 at dmu_objset_open_impl+0xd4
#13 0xffffffff810b4014 at dsl_pool_init+0x34
#14 0xffffffff810c7eea at spa_load+0x6aa
#15 0xffffffff810c90b2 at spa_load_best+0x52
#16 0xffffffff810cb0ca at spa_open_common+0x14a
#17 0xffffffff810a892d at dsl_dir_open_spa+0x2cd
Uptime: 3s
Cannot dump. Device not defined or unavailable.

I've booted back into the 8.2 kernel without any problems, but I'm
wondering if anyone can suggest what I should try to get this working?
I used freebsd-update to upgrade, and this was after the first
"freebsd-update install" where it installs the kernel.

My /boot/loader.conf has:



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