kernel: panic: softdep_sync_buf: Unknown type jnewblk

António Trindade antonio.trindade at
Sun Jan 29 14:32:04 UTC 2012


I'm pretty sure this will be considered almost as spam, but I reactivated SU+J a day and half ago and it still did not panic.
However, I also activated dumpdev, so I'll be prepared to provide additional information in case of a panic.

Cumprimentos/Best regards/Mit freundlichen Grüßen,
António Trindade
Antonio <dot> Trindade <at>

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On 2012/01/29, at 08:09, Kirk McKusick wrote:

>> Date: Fri, 27 Jan 2012 09:39:34 +0100
>> From: Yamagi Burmeister <lists at>
>> To: freebsd at
>> Cc: antonio.trindade at, freebsd-fs at, dougb at,
>>        freebsd-stable at
>> Subject: Re: kernel: panic: softdep_sync_buf: Unknown type jnewblk
>> Hi :)
>> On Thu, 26 Jan 2012 17:54:30 -0800
>> Jeremy Chadwick <freebsd at> wrote:
>>> I'll also point out, though the OP isn't using snapshots, that it's
>>> confirmed use of snapshots on SU+J can result in a full filesystem hang.
>>> Confirmation is from Kirk McKusick (author of SU and designer of SU+J):
>>> Something really needs to be done about this combination of problems.
>>> Since SU+J is the default choice for all UFS filesystems on 9.0-RELEASE,
>>> the only solution I can think of is to send a massive announcement to
>>> relevant mailing lists, AND put something on the home page
>>> about these issues.
>> The problem was analyzed but no immediate solution found. Therefor
>> snapshots on filesystems with SU+J (but not SU alone) were disabled
>> by Kirk McKusick in SVN r230250. The MFC to 9-STABLE has still to
>> be done. Maybe this fix is a candidate for an errata notice / patch,
>> distributed by freebsd-update?
> With revision 230725 I have MFC'ed to 9 the above change to disable
> snapshots when running SU+J. Hopefully Jeff and I will manage to get
> a fix for snapshots so as to be able to run them reliably with SU+J.
> The above change is not relevant to 8 or earlier systems, so this MFC
> will not be applied to them.
> 	Kirk McKusick

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