Source: zfs-linux Version: 2.0.1-1 Severity: grave Tags: upstream Justification: causes data loss X-Debbugs-Cc: aeru...@aerusso.net
See Brian Behlendof's comment at [1], in the merge request for commit 3f81aba76, referencing the analysis of the bug report [2]. In summary: a kernel buffer iterator can be advanced beyond its end. On kernels 5.12 and later, a safety mechanism has been created that detects this error, but as of 5.10, this mechanism is not present (AFAICT). The aforementioned commit addresses the issue, and has also been applied to 2.0.5-staging (as 3e0bc63e1). As of now, no released version of ZFS addresses this issue. There is a suggestion that this could lead to memory corruption, which seems plausible. The lack of widespread data loss under ZFS 2.0 to date suggests that any corruption is relatively minor. [1] https://github.com/openzfs/zfs/pull/12155#issuecomment-850935748 [2] https://github.com/openzfs/zfs/issues/12041
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