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zfs crash on FreeBSD 10.3

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Julian Elischer

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Oct 14, 2016, 3:19:53 AM10/14/16

to freeb...@freebsd.org, freebsd-current

I attempted to add a second partition to an existing FS pool in
FreeBSD 10.3 and the result was a crash..

is there anyone out there with a scratch system (10.3) (or two spare
drives) who can show me this working?

Does it look familiar to anyone?

The drive 'boot0' is being used as the root drive, but we are in
single user mode, so its' read-only at this stage.

=============== cut-n-paste =============

[boot -s]

[...]

Trying to mount root from zfs:p8/image1 []...
Enter full pathname of shell or RETURN for /bin/sh:
PS1="# "
#
#
# ls /dev/gpt
boot0 boot1
# zpool attach -f p8 gpt/boot0 gpt/boot1

Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address = 0x50
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff81717063
stack pointer = 0x28:0xfffffe0169bfc640
frame pointer = 0x28:0xfffffe0169bfc9a0
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 = 3 (txg_thread_enter)
trap number = 12
Panic:Thought about setting the watchdog to 10 Minutes
panic: page fault
cpuid = 1

KDB: stack backtrace:
stack1 db_trace_self_wrapper+0x2a
kdb_backtrace+0x37 vpanic+0xf7
panic+0x67 trap_fatal+0x264
trap_pfault+0x1c2
trap+0x38c
calltrap+0x8
dsl_scan_sync+0x2f3
spa_sync+0x328
txg_sync_thread+0x140
fork_exit+0x135
fork_trampoline+0xe

KDB: enter: panic
[ thread pid 3 tid 100328 ]
Stopped at kdb_enter+0x50: movq $0,0x6bd5cd(%rip)
db> reboot

I will add that after this, every boot hits this problem. (same stack
trace). the box is effectively bricked
(or would be if it weren't just a bhyve image)

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Trond Endrestøl

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Oct 14, 2016, 6:32:30 AM10/14/16

to Julian Elischer, freeb...@freebsd.org, freebsd-current

On Fri, 14 Oct 2016 00:19-0700, Julian Elischer wrote:

> I attempted to add a second partition to an existing FS pool in FreeBSD 10.3
> and the result was a crash..
>
> is there anyone out there with a scratch system (10.3) (or two spare drives)
> who can show me this working?
>
> Does it look familiar to anyone?
>
> The drive 'boot0' is being used as the root drive, but we are in single user
> mode, so its' read-only at this stage.
>
> =============== cut-n-paste =============
>
> [boot -s]
>
> [...]
>
> Trying to mount root from zfs:p8/image1 []...
> Enter full pathname of shell or RETURN for /bin/sh:
> PS1="# "
> #
> #
> # ls /dev/gpt
> boot0 boot1

> # zpool attach -f p8 gpt/boot0 gpt/boot1

Do you really need to force zpool to attach the second partition?
What happens if you omit the -f flag?

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