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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