mirror_zfs/module
Paul Dagnelie 475aa97cab Prevent metaslab_sync panic due to spa_final_dirty_txg
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
2019-08-30 09:28:31 -07:00
..
avl Update build system and packaging 2018-05-29 16:00:33 -07:00
icp Minor style cleanup 2019-07-16 17:22:31 -07:00
lua Linux 5.3: Fix switch() fall though compiler errors 2019-08-21 09:29:23 -07:00
nvpair Use NV_ENCODE_NATIVE for nvlist encoding variable 2019-04-26 11:24:31 -07:00
spl Use smaller default slack/delta value for schedule_hrtimeout_range() 2019-08-28 14:56:54 -07:00
unicode Update build system and packaging 2018-05-29 16:00:33 -07:00
zcommon Fast Clone Deletion 2019-07-26 10:54:14 -07:00
zfs Prevent metaslab_sync panic due to spa_final_dirty_txg 2019-08-30 09:28:31 -07:00
.gitignore Prepare SPL repo to merge with ZFS repo 2018-05-29 14:51:39 -07:00
Makefile.in Linux 5.3 compat: Makefile subdir-m no longer supported 2019-08-19 15:22:52 -07:00