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Date:      Thu, 23 Nov 2023 15:01:19 -0500
From:      mike tancsa <mike@sentex.net>
To:        Julien Cigar <julien@perdition.city>, infoomatic <infoomatic@gmx.at>
Cc:        questions@freebsd.org
Subject:   Re: OpenZFS 2.2 -> 2.2.1 Block Cloning Bug Data Corruption
Message-ID:  <35b0d223-6b92-4c3e-9331-e356e6977bb0@sentex.net>
In-Reply-To: <hn7mmi5kthzuoohneh3rmz2zxb6gsku7zkkptmnornafygfejc@563asdybzgxo>
References:  <CAFYkXjkb0P71=kDfG_TFz_hi4BbmMWGm5tcWG0Y-5fVCSnEeLw@mail.gmail.com> <iib7hdv4ihdwha6pkp6vkcaqxo2p5zsipzhzdrdvar6jkoma7g@4iz2zprub56t> <86c822d2-751a-43b6-a8ee-068429b5bc24@gmx.at> <hn7mmi5kthzuoohneh3rmz2zxb6gsku7zkkptmnornafygfejc@563asdybzgxo>

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On 11/23/2023 8:36 AM, Julien Cigar wrote:
> On Thu, Nov 23, 2023 at 01:07:33PM +0100, infoomatic wrote:
>> On 23.11.23 12:05, Julien Cigar wrote:
>>> On Thu, Nov 23, 2023 at 02:20:49AM +0100, Tomek CEDRO wrote:
>>>> https://www.phoronix.com/news/OpenZFS-2.2.1-Released
>>> Fortunately block cloning is disabled by default on 14.0-RELEASE,
>>> (see vfs.zfs.bclone_enabled)
>>>
>> I would not be too sure about that, see [1]. It seems just that with
>> this option disabled it is much harder to hit the bug.
>>
>> [1] https://github.com/openzfs/zfs/issues/15526#issuecomment-1823857131
> Ah, thanks for the link..! I hope an EN will be published ASAP then, it
> looks a serious issue..

Am I right in reading
sudo sysctl -w vfs.zfs.dmu_offset_next_sync=0

to work around the issue for now ?

     ---Mike






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