@anthoineb Thank you. We have now installed the required packages on all three hypervisors hosting the OpenSearch data VMs:
blktap-3.55.5-6.7.xcpng8.3.x86_64
blktap-debuginfo-3.55.5-6.7.xcpng8.3.x86_64
devtoolset-11-gdb
The debuginfo package was not exposed by our internal yum mirror metadata, but we found the exact matching RPM in the official XCP-ng 8.3 stable-updates repository.
No services or hypervisors were restarted during the installation.
Could you please provide the recommended gdb commands for attaching to the affected tapdisk process and inspecting the blkif ring? In particular, it would be helpful to know which structures, fields and threads should be captured.
We plan to test the attach procedure manually on a healthy tapdisk first. After that, we can add a short pre-reboot diagnostic pause to our recovery controller so that the GDB data can be collected during the next occurrence before the VM is rebooted.