EROFS Disables LZ4 Rolling Decompression Due To Data Corruption Possibility
The EROFS file system has temporarily disabled its LZ4 rolling decompression feature ahead of the Linux 7.3-rc3 kernel release. This decision was made after AWS identified rare instances of data corruption caused by uncontrolled backward memory copies in the current LZ4 implementation. The change prioritizes data correctness over the memory efficiency benefits previously provided by the rolling window optimization.
- ▪AWS engineers discovered that specific LZ4 datasets could result in corrupted data on systems using EROFS.
- ▪The root cause is identified as uncontrolled backward memory copies in the kernel's LZ4 code, which violates the assumptions of the rolling decompression optimization.
- ▪Disabling the feature increases the runtime memory footprint, as the system can no longer rely on a bounded rolling window of temporary pages.
- ▪The rolling decompression capability may be revived in the future if the official LZ4 code is updated to ensure forward copying or if EROFS maintains its own implementation.
- ▪This fix is included in the Linux 7.3-rc3 kernel release to ensure data integrity for production environments.
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| Publication time | Sat, 12 Sep 2026 20:33:00 -0400 |
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EROFS Disables LZ4 Rolling Decompression Due To Data Corruption Possibility Written by Michael Larabel in Linux Storage on 12 September 2026 at 08:33 PM EDT. Add A Comment The EROFS read-only file-system popular for embedded systems, containers, and other use-cases has resorted to temporarily disabling its LZ4 rolling decompression support due to data corruption concerns. Ahead of the Linux 7.3-rc3 kernel release due out on Sunday, EROFS has mid-cycle deemed it necessary to disable the LZ4 rolling data decompression capability it supported. Today's EROFS merge noted: "The most impactful fix here is to disable LZ4 rolling decompression for now.
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