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Fix rare cksum errors after rebuild

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Currently, after rebuild (aka sequential resilver), checksum
errors can be seen sometimes on the spare vdev or draid spare.
On my laptop, it happens from 2 to 4 times of running
redundancy_draid_spare1 test in a loop for 100 times.

It looks like there's a race in vdev_rebuild_thread() when the
rebuild of space map ranges is finished and we re-enable
allocations from the metaslab too soon: a new allocations may
happen from that metaslab before txg with the rebuilt ranges is
sync-ed, causing undesirable interference.

Solution: wait for the txg to be sync-ed before enabling metaslab.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Akash B <akash-b@hpe.com>
Signed-off-by: Andriy Tkachuk <atkachuk@wasabi.com>
Closes #18307
Closes #18319
Closes #18473
This commit is contained in:
Andriy Tkachuk
2026-05-01 20:15:27 +01:00
committed by Tony Hutter
parent b0c1dcb531
commit 76fd64ac9f
3 changed files with 11 additions and 8 deletions
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include/sys/vdev_rebuild.h
+1
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@@ -70,6 +70,7 @@ typedef struct vdev_rebuild {
zfs_range_tree_t *vr_scan_tree;
kmutex_t vr_io_lock; /* inflight IO lock */
kcondvar_t vr_io_cv; /* inflight IO cv */
uint64_t vr_last_txg; /* last used txg */
/* In-core state and progress */
uint64_t vr_scan_offset[TXG_SIZE];