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btrfs kernel panic prevents boot of Ubuntu 18.04. How to fix?

Asked by Richard H.

I ran

# btrfs bal start -dusage=50

which failed with ENOSPC.
Almost immediately after that, the whole system hangs. The pointer responses to the mouse, but nothing else was happening. I switched to the console, which shows some kernel panic output, including:

RIP: btrfs_root_node+0x10/0x50 [btrfs] RSP: fffb7dd01947ad8

This is my primary filesystem. So now, I cannot boot. I get the same kernel panic when I try.

How can I fix the corrupted filesystem without losing data so I can boot it again?

Thanks!

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Manfred Hampl (m-hampl) said : 		#1

If booting in recovery mode does not work, then you have to boot into a live system from an installer in the "try Ubuntu without installing" mode and try repairing your file system in that mode.

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