thin_ll_dum - Segmentation fault

[Dilvish5]

Hello

I'm trying to recover the lvm-thing metadata after a hardware failure using thin_ll_dump, but I'm getting a segmentation fault while running the following command:

thin_ll_dump /dev/mapper/pve-data_meta0 --device-details-root=128146 --data-mapping-root=12754 -o /backup/logs/12754-128146.xml

With other data-mapping-root, everything works ok and all blocks get marked as orphans, but with 12754 (which I assume is the correct one) the application dies after a second with Segmentation fault.
It writes in the output file some data but dies afterwards: 12754-128146.txt

The kernel log looks like this:
core.txt

I'm assuming it's triggering some bug somewhere. The thin_check gives the following error: bad checksum in metadata index block (block 109413)

I'd appreciate any assistance to bypass this issue.

Thank you very much!

[jthornber]

Could you pack the metadata with thin_metadata_pack and send it to me please? I'll take a look on Monday.

…

On Sat, 9 Oct 2021, 18:46 Dilvish5, ***@***.***> wrote: Hello I'm trying to recover the lvm-thing metadata after a hardware failure using thin_ll_dump, but I'm getting a segmentation fault while running the following command: thin_ll_dump /dev/mapper/pve-data_meta0 --device-details-root=128146 --data-mapping-root=12754 -o /backup/logs/12754-128146.xml With other data-mapping-root, everything works ok and all blocks get marked as orphans, but with 12754 (which I assume is the correct one) the application dies after a second with Segmentation fault. It writes in the output file some data but dies afterwards: 12754-128146.txt <https://github.com/jthornber/thin-provisioning-tools/files/7316075/12754-128146.txt> The kernel log looks like this: core.txt <https://github.com/jthornber/thin-provisioning-tools/files/7316078/core.txt> I'm assuming it's triggering some bug somewhere. The thin_check gives the following error: bad checksum in metadata index block (block 109413) I'd appreciate any assistance to bypass this issue. Thank you very much! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#190>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AABOSQ5VUT6EITGICVPA6FLUGB5YFANCNFSM5FVQOJBQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

[mingnus]

Hi,

Here's a quick fix for this issue.
https://github.com/mingnus/thin-provisioning-tools/commits/2021-10-12-thin-ll-dump-fixes

Could you help provide the LVM archives/backups please? They should be stored in /etc/lvm/archive/ and /etc/lvm/backup, so that I could do some analysis according to the volume sizes & dev-ids configurations.

[Dilvish5]

Hello

Sent by email.

Thank you