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Prevent metaslab_sync panic due to spa_final_dirty_txg

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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
This commit is contained in:
Paul Dagnelie
2019-08-30 09:28:31 -07:00
committed by Brian Behlendorf
parent e2fcfa70e3
commit 475aa97cab
2 changed files with 12 additions and 7 deletions
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tests/runfiles/linux.run
+3 -5
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@@ -481,15 +481,13 @@ tests = ['zpool_trim_attach_detach_add_remove',
tags = ['functional', 'zpool_trim']
[tests/functional/cli_root/zpool_upgrade]
tests = ['zpool_upgrade_001_pos',
tests = ['zpool_upgrade_001_pos', 'zpool_upgrade_002_pos',
'zpool_upgrade_003_pos', 'zpool_upgrade_004_pos',
'zpool_upgrade_005_neg', 'zpool_upgrade_006_neg',
'zpool_upgrade_007_pos', 'zpool_upgrade_008_pos',
'zpool_upgrade_009_neg']
tags = ['functional', 'cli_root', 'zpool_upgrade']
# Disabled pending resolution of #9185 and #9186.
# 'zpool_upgrade_002_pos', 'zpool_upgrade_003_pos', 'zpool_upgrade_004_pos',
# 'zpool_upgrade_007_pos', 'zpool_upgrade_008_pos',
[tests/functional/cli_user/misc]
tests = ['zdb_001_neg', 'zfs_001_neg', 'zfs_allow_001_neg',
'zfs_clone_001_neg', 'zfs_create_001_neg', 'zfs_destroy_001_neg',