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arc: avoid possible deadlock in arc_read

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In l2arc_evict(), the config lock may be acquired in reverse order
(e.g., first the config lock (writer), then a hash lock) unlike in
arc_read() during scenarios like L2ARC device removal. To avoid
deadlocks, if the attempt to acquire the config lock (reader) fails
in arc_read(), release the hash lock, wait for the config lock, and
retry from the beginning.

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes #17071
This commit is contained in:
Ameer Hamza
2025-02-26 00:32:12 +05:00
committed by GitHub
parent 701093c44f
commit ab3db6d15d
6 changed files with 40 additions and 16 deletions
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module/zfs/spa.c
+1 -1
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@@ -2778,7 +2778,7 @@ spa_load_verify_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
* When damaged consider it to be a metadata error since we cannot
* trust the BP_GET_TYPE and BP_GET_LEVEL values.
*/
if (!zfs_blkptr_verify(spa, bp, BLK_CONFIG_NEEDED, BLK_VERIFY_LOG)) {
if (zfs_blkptr_verify(spa, bp, BLK_CONFIG_NEEDED, BLK_VERIFY_LOG)) {
atomic_inc_64(&sle->sle_meta_count);
return (0);
}