ZFS pool panic: overlapping segment error diagnosis

The weird errors you see when your root partition is full, TikTok uses a lot of bandwidth by preloading videos, and dealing with a ZFS pool that won’t import.

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We were asked about dealing with a ZFS pool that won’t import.

Importing corrupted pool causes PANIC

Klara added additional diagnostics to ZFS to help investigate this issue, that shipped as part of 2.3.4

Klara also has a work-around to get past the errors, but it is likely to result in data loss if there are overlapping segments, or the leaking of free space when segments are not entirely removed (not to be attempted without a developer present)