c/mirror_zfs
1
0
Fork 0
mirror of https://git.proxmox.com/git/mirror_zfs.git synced 2026-05-23 19:04:45 +03:00
Code Issues Packages Projects Releases Wiki Activity

arc: avoid possible deadlock in arc_read

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/dsl_scan.c
+1 -1
View File
@@ -2305,7 +2305,7 @@ dsl_scan_recurse(dsl_scan_t *scn, dsl_dataset_t *ds, dmu_objset_type_t ostype,
DMU_USERUSED_OBJECT, tx);
}
arc_buf_destroy(buf, &buf);
} else if (!zfs_blkptr_verify(spa, bp,
} else if (zfs_blkptr_verify(spa, bp,
BLK_CONFIG_NEEDED, BLK_VERIFY_LOG)) {
/*
* Sanity check the block pointer contents, this is handled