Help with in-place upgrade from R4.2 to R4.3

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Boryeu Mao

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May 20, 2026, 5:16:04 PM (4 days ago) May 20

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During Stage 3, on the midst of upgrading xfce4 packages (specifically genmon-plugin), the process encountered Buffer I/O errors on the device of the root file system, along with a whole slew of writing warnings and errors on the same device. When the dust is settled, dom0 remains (somewhat) functioning, but the root filesystem was thrown into ‘emergency_ro’ mode, at about 87% full. Right before the Buffer I/O errors started, dmesg reported switching root-pool to out-of-data-space mode (for both queue IO and error IO), which unfortunately meant little to me. ‘mount -o remount,we’ did not report anything but the fs remained read-only. ‘lvconvert —merge’ of the R42Backup snapshot that was created by the update script returns a message to the effect that merging into the old snapshot origin qubes_dom0/root is not supported. While dom0 is partially working, the system is essentially stuck. Any help to get me out of the jam will be most appreciated. TIA.

Boryeu Mao

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May 23, 2026, 3:11:42 PM (yesterday) May 23

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The problem was the insufficient size of root-pool. The system is now close to being ready for another go at upgrade-in-place.