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If a pool enables the SPACEMAP_HISTOGRAM feature shortly before being exported, we can enter a situation that causes a kernel panic. Any metaslabs that are loaded during the final dirty txg and haven't already been condensed will cause metaslab_sync to proceed after the final dirty txg so that the condense can be performed, which there are assertions to prevent. Because of the nature of this issue, there are a number of ways we can enter this state. Rather than try to prevent each of them one by one, potentially missing some edge cases, we instead cut it off at the point of intersection; by preventing metaslab_sync from proceeding if it would only do so to perform a condense and we're past the final dirty txg, we preserve the utility of the existing asserts while preventing this particular issue. Reviewed-by: Matt Ahrens <matt@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Paul Dagnelie <pcd@delphix.com> Closes #9185 Closes #9186 Closes #9231 Closes #9253 |
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