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When doing a manual TRIM on a zpool, the metaslab being TRIMmed is potentially re-enabled before all queued TRIM zios for that metaslab have completed. Since TRIM zios have the lowest priority, it is possible to get into a situation where allocations occur from the just re-enabled metaslab and cut ahead of queued TRIMs to the same metaslab. If the ranges overlap, this will cause corruption. We were able to trigger this pretty consistently with a small single top-level vdev zpool (i.e. small number of metaslabs) with heavy parallel write activity while performing a manual TRIM against a somewhat 'slow' device (so TRIMs took a bit of time to complete). With the patch, we've not been able to recreate it since. It was on illumos, but inspection of the OpenZFS trim code looks like the relevant pieces are largely unchanged and so it appears it would be vulnerable to the same issue. Reviewed-by: Igor Kozhukhov <igor@dilos.org> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Jason King <jking@racktopsystems.com> Illumos-issue: https://www.illumos.org/issues/15939 Closes #15395 |
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