Re: upgrading to 12.2.6 damages cephfs (crc errors)

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The problem seems similar to https://tracker.ceph.com/issues/23871
which was fixed in mimic but not luminous:

fe5038c7f9 osd/PrimaryLogPG: clear data digest on WRITEFULL if skip_data_digest

.. dan
On Fri, Jul 13, 2018 at 12:45 PM Dan van der Ster <dan@xxxxxxxxxxxxxx> wrote:
>
> Hi,
>
> Following the reports on ceph-users about damaged cephfs after
> updating to 12.2.6 I spun up a 1 node cluster to try the upgrade.
> I started with two OSDs on 12.2.5, wrote some data.
> Then I restarted the OSDs one by one while continuing to write to the
> cephfs mountpoint.
> Then I restarted the (single) MDS, and it is indeed damaged with a crc error:
>
> 2018-07-13 12:38:55.261379 osd.1 osd.1 137.138.62.86:6805/35320 2 :
> cluster [ERR] 2.15 full-object read crc 0xed77af7c != expected
> 0x1a1d319d on 2:aa448500:::500.00000000:head
> 2018-07-13 12:38:55.285994 osd.0 osd.0 137.138.62.86:6801/34755 2 :
> cluster [ERR] 2.13 full-object read crc 0xa73a97ef != expected
> 0x3e6fdb4a on 2:c91d4a1d:::mds0_inotable:head
>
> I think it goes without saying that nobody should upgrade a cephfs to
> 12.2.6 until this is understood.
>
> -- Dan
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