Re: BTRFS error (device dm-0): block=711870922752 write time tree block corruption detected

[Samir Benmendil]

On Feb 17, 2021 at 16:56, Samir Benmendil wrote:

On 17 February 2021 13:45:02 GMT+00:00, Hugo Mills <h...@carfax.org.uk> wrote:

On Wed, Feb 17, 2021 at 01:26:40PM +0000, Samir Benmendil wrote:

Any advice on what to do next would be appreciated.

  The first thing to do is run memtest for a while (I'd usually
recomment at least overnight) to identify your broken RAM module and
replace it. Don't try using the machine normally until you've done
that.

I'll keep it running for a while longer.

Memtest just finished it's first pass with no errors, but printed a note regarding vulnerability to high freq row hammer bit flips.

    [root@hactar ~]# btrfs check --readonly /dev/mapper/home_ramsi
    Opening filesystem to check...
    Checking filesystem on /dev/mapper/home_ramsi
    UUID: 1e0fea36-a9c9-4634-ba82-1afc3fe711ea
    [1/7] checking root items
    [2/7] checking extents
    [3/7] checking free space cache
    [4/7] checking fs roots
    [5/7] checking only csums items (without verifying data)
    [6/7] checking root refs
    [7/7] checking quota groups skipped (not enabled on this FS)
    found 602514441102 bytes used, no error found
    total csum bytes: 513203560
    total tree bytes: 63535939584
    total fs tree bytes: 58347077632
    total extent tree bytes: 4500455424
    btree space waste bytes: 15290027113
    file data blocks allocated: 25262661455872
    referenced 4022677716992


Thanks again for your help Hugo.

Samir

2nd pass flagged a few errors, removed one of the RAM module, tested again and it passed. I then booted and ran `btrfs check --readonly` with no errors.

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