D28682.diff
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	diff --git a/sys/contrib/openzfs/module/zfs/arc.c b/sys/contrib/openzfs/module/zfs/arc.c
	--- a/sys/contrib/openzfs/module/zfs/arc.c
	+++ b/sys/contrib/openzfs/module/zfs/arc.c
	@@ -9062,6 +9062,7 @@
	l2arc_write_callback_t *cb = NULL;
	zio_t pio, wzio;
	uint64_t guid = spa_load_guid(spa);
	+ l2arc_dev_hdr_phys_t *l2dhdr = dev->l2ad_dev_hdr;

	ASSERT3P(dev->l2ad_vdev, !=, NULL);

	@@ -9293,7 +9294,8 @@
	* Although we did not write any buffers l2ad_evict may
	* have advanced.
	*/
	- l2arc_dev_hdr_update(dev);
	+ if (dev->l2ad_evict != l2dhdr->dh_evict)
	+ l2arc_dev_hdr_update(dev);

	return (0);
	}