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Remove zl_issuer_lock from zil_suspend(). #15103

Merged
merged 1 commit into from
Jul 25, 2023
Merged

Remove zl_issuer_lock from zil_suspend(). #15103

merged 1 commit into from
Jul 25, 2023

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amotin
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@amotin amotin commented Jul 24, 2023

This locking was recently added as part of #14979. But appears it is illegal to take zl_issuer_lock while holding dp_config_rwlock, taken by dsl_pool_hold(). It causes deadlock with sync thread in spa_sync_upgrades(). On a second throught though, we should not need this locking, since zil_commit_impl() we call below takes zl_issuer_lock, that should sufficiently protect zl_suspend reads, combined with other logic from #14979.

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Performance enhancement (non-breaking change which improves efficiency)
  • Code cleanup (non-breaking change which makes code smaller or more readable)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
  • Documentation (a change to man pages or other documentation)

Checklist:

@amotin
Remove zl_issuer_lock from zil_suspend().
5395d11 
This locking was recently added as part of openzfs#14979. But appears it
is illegal to take zl_issuer_lock while holding dp_config_rwlock,
taken by dsl_pool_hold().  It causes deadlock with sync thread in
spa_sync_upgrades().  On a second throught though, we should not
need this locking, since zil_commit_impl() we call below takes
zl_issuer_lock, that should sufficiently protect zl_suspend reads,
combined with other logic from openzfs#14979.

Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
@amotin amotin requested a review from behlendorf July 24, 2023 19:37
@amotin amotin added the Status: Code Review Needed Ready for review and testing label Jul 24, 2023
@amotin amotin requested a review from grwilson July 24, 2023 19:45
@amotin
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amotin commented Jul 24, 2023

It should fix this: http://build.zfsonlinux.org/builders/CentOS%209%20x86_64%20%28TEST%29/builds/858/steps/shell_4/logs/console

@amotin amotin mentioned this pull request Jul 25, 2023
Merged
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@behlendorf behlendorf added Status: Accepted Ready to integrate (reviewed, tested) and removed Status: Code Review Needed Ready for review and testing labels Jul 25, 2023
@behlendorf behlendorf merged commit 2848de1 into openzfs:master Jul 25, 2023
@amotin amotin deleted the zil_suspend_fix branch July 25, 2023 16:10
amotin added a commit to amotin/zfs that referenced this pull request Jul 25, 2023
@amotin
Remove zl_issuer_lock from zil_suspend().
676fc30 
This locking was recently added as part of openzfs#14979. But appears it
is illegal to take zl_issuer_lock while holding dp_config_rwlock,
taken by dsl_pool_hold().  It causes deadlock with sync thread in
spa_sync_upgrades().  On a second thought, we should not
need this locking, since zil_commit_impl() we call below takes
zl_issuer_lock, that should sufficiently protect zl_suspend reads,
combined with other logic from openzfs#14979.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes openzfs#15103
behlendorf pushed a commit that referenced this pull request Jul 25, 2023
@amotin @behlendorf
Remove zl_issuer_lock from zil_suspend().
991834f 
This locking was recently added as part of #14979. But appears it
is illegal to take zl_issuer_lock while holding dp_config_rwlock,
taken by dsl_pool_hold().  It causes deadlock with sync thread in
spa_sync_upgrades().  On a second thought, we should not
need this locking, since zil_commit_impl() we call below takes
zl_issuer_lock, that should sufficiently protect zl_suspend reads,
combined with other logic from #14979.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #15103
@behlendorf behlendorf mentioned this pull request Jul 25, 2023
Open
lundman pushed a commit to openzfsonwindows/openzfs that referenced this pull request Dec 12, 2023
@amotin @lundman
Remove zl_issuer_lock from zil_suspend().
d892ae0 
This locking was recently added as part of openzfs#14979. But appears it
is illegal to take zl_issuer_lock while holding dp_config_rwlock,
taken by dsl_pool_hold().  It causes deadlock with sync thread in
spa_sync_upgrades().  On a second thought, we should not
need this locking, since zil_commit_impl() we call below takes
zl_issuer_lock, that should sufficiently protect zl_suspend reads,
combined with other logic from openzfs#14979.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes openzfs#15103
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@behlendorf behlendorf behlendorf approved these changes

@grwilson grwilson Awaiting requested review from grwilson

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