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Date:      Sun, 01 Jun 2014 17:00:55 -0700
From:      Mike Carlson <mike@bayphoto.com>
To:        freebsd-fs@freebsd.org
Subject:   Re: ZFS Kernel Panic on 10.0-RELEASE
Message-ID:  <538BBEB7.4070008@bayphoto.com>
In-Reply-To: <5388E5B4.3030002@bayphoto.com>
References:  <5388D64D.4030400@bayphoto.com> <EC2EA442-56FC-46B4-A1E2-97523029B7B3@mail.turbofuzz.com> <5388E5B4.3030002@bayphoto.com>

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On 5/30/2014 1:10 PM, Mike Carlson wrote:
> On 5/30/2014 12:48 PM, Jordan Hubbard wrote:
>> On May 30, 2014, at 12:04 PM, Mike Carlson <mike@bayphoto.com> wrote:
>>
>>> Over the weekend, we had upgraded one of our servers from=20
>>> 9.1-RELEASE to 10.0-RELEASE, and then the zpool was upgraded (from=20
>>> 28 to 5000)
>>>
>>> Tuesday afternoon, the server suddenly rebooted (kernel panic), and=20
>>> as soon as it tried to remount all of its ZFS volumes, it panic'd=20
>>> again.
>> What=92s the panic text?  That=92s pretty crucial in figuring out whet=
her=20
>> this is recoverable (e.g. if it=92s spacemap corruption related,=20
>> probably not).
>>
>> - Jordan
>>
>>
>>
> I had linked the pictures I took of the console, but here is my manual =

> reproduction:
>
>    Fatal trap 12: page fault while in kernel mode
>    cpuid =3D 7; apic id =3D 07
>    fault virtual address    =3D 0x4a0
>    fault code               =3D supervisor read data, page not present
>    instruction pointer      =3D 0x20:0xffffffff81a7f39f
>    stack pointer            =3D 0x28:0xfffffe1834789570
>    frame pointer            =3D 0x28:0xfffffe18347895b0
>    code segment             =3D base 0x0, limit 0xfffff, type 0x1b
>                              =3D DPL 0, pres 1, long 1, def32 0, gran 1=

>    processor eflags         =3D interrupt enabled, resume, IOPL =3D 0
>    current process          =3D 1849 (txg_thread_enter)
>    trap number              =3D 12
>    panic: page fault
>    cpuid =3D 7
>    KDB: stack backtrace:
>    #0 0xffffffff808e7dd0 at kdb_backtrace+0x60
>    #1 0xffffffff808af8b5 at panic+0x155
>    #2 0xffffffff80c8e629 at trap_fatal+0x3a2
>    #3 0xffffffff80c8e969 at trap_pfault+0x2c9
>    #4 0xffffffff80c8e0f6 at trap+0x5e6
>    #5 0xffffffff80c75392 at calltrap+0x8
>    #6 0xffffffff81a53b5a at dsl_dataset_block_kill+0x3a
>    #7 0xffffffff81a50967 at dnode_sync+0x237
>    #8 0xffffffff81a48fcb at dmu_objset_sync_dnodes+0x2b
>    #9 0xffffffff81a48e4d at dmo_objset_sync+0x1ed
>    #10 0xffffffff81a5d29a at dsl_pool_sync+0xca
>    #11 0xffffffff81a78a4e at spa_sync+0x52e
>    #12 0xffffffff81a81925 at txg_sync_thread+0x375
>    #13 0xffffffff8088198a at fork_exit+0x9a
>    #14 0xffffffff80c758ce at fork_trampoline+0xe
>    uptime: 46s
>    Automatic reboot in 15 seconds - press a key on the console to abort=

>
This just happened again to another server. We upgraded two servers on=20
the same morning, and now both of them exhibit this corrupted zfs volume =

and panic behavior.

Out of all the volumes, one of them is causing the panic, and the panic=20
message is nearly identical.

I have 4 snapshots over the last 24 hours, so hopefully a snapshot from=20
noon today can be sent to a new volume ( zfs send | zfs recv )

I guess I can now rule out it being a hardware issue, this is clearly=20
problem related to the upgrade (freebsd-update  was used). I first=20
thought the first system had a bad upgrade, perhaps a mix and match of=20
9.2 binaries running on a 10 kernel, but I used the 'freebsd-update IDS' =

command to verify the integrity of the install, and it looked good, the=20
only differences were config files in /etc/ that we manage.




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