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During device removal stress tests, we noticed that we were tripping the assertion that mg_initialized was true. After investigation, it was determined that the mg in question was the embedded log metaslab group for a newly added vdev; the normal mg had been initialized (by metaslab_sync_reassess, via vdev_sync_done). However, because the spa config alloc lock is not held as writer across both calls to metaslab_sync_reassess, it is possible for an allocation to happen between the two metaslab_groups being initialized. Because the metaslab code doesn't check the group in question, just the vdev's main mg, it is possible to get past the initial check in vdev_allocatable and later fail due to the assertion. We simply remove the assertions. We could also consider locking the ALLOC lock around the reassess calls in vdev_sync_done, but that risks deadlocks. We could check the actual target mg in vdev_allocatable, but that risks racing with a passivation that comes in after that check but before the assertion. We still won't be able to actually allocate from the metaslab group if no metaslabs are ready, so this change shouldn't break anything. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Wilson <george.wilson@delphix.com> Signed-off-by: Paul Dagnelie <pcd@delphix.com> Closes #15818 |
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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.
Official Resources
- Documentation - for using and developing this repo
- ZoL Site - Linux release info & links
- Mailing lists
- OpenZFS site - for conference videos and info on other platforms (illumos, OSX, Windows, etc)
Installation
Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.
Contribute & Develop
We have a separate document with contribution guidelines.
We have a Code of Conduct.
Release
OpenZFS is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197
Supported Kernels
- The
METAfile contains the officially recognized supported Linux kernel versions. - Supported FreeBSD versions are any supported branches and releases starting from 12.4-RELEASE.