fix: NPE error #252
fix: NPE error #252
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🧹 Outside diff range and nitpick comments (1)
pkg/spdk/engine.go (1)
999-1002: LGTM! The nil check prevents NPE during replica addition failures.The added nil check properly guards against null pointer dereference when accessing the replica's Mode field. This fix correctly handles cases where replica addition fails before initializing the status map entry.
Consider extracting the mode update logic into a helper method for better readability:
-if e.ReplicaStatusMap[dstReplicaName] != nil && e.ReplicaStatusMap[dstReplicaName].Mode != types.ModeERR { - e.log.WithError(err).Errorf("Engine failed to start replica %s rebuilding, will mark the rebuilding replica mode from %v to ERR", dstReplicaName, e.ReplicaStatusMap[dstReplicaName].Mode) - e.ReplicaStatusMap[dstReplicaName].Mode = types.ModeERR -} +if err := e.markReplicaModeAsError(dstReplicaName, "failed to start replica rebuilding"); err != nil { + e.log.WithError(err).Errorf("Failed to mark replica %s mode as ERR", dstReplicaName) +}
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pkg/spdk/engine.go(1 hunks)
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pkg/spdk/engine.go (1)
999-1002: Verify similar patterns in the codebase.
While this fix addresses the immediate NPE issue, consider reviewing similar patterns where replica mode is accessed without nil checks.
Run the following script to find similar patterns:
✅ Verification successful
Let me analyze the code further to check for potential nil pointer issues.
Similar patterns are properly protected against nil pointer dereference
After analyzing the codebase, I found that other accesses to ReplicaStatusMap are properly protected:
- Direct field accesses are preceded by nil checks in critical paths
- Functions that operate on replica status have proper nil checks before accessing the map values
- The pattern in the original fix is consistent with existing defensive programming practices in the codebase
Key examples of proper nil checks:
dstReplicaStatus := e.ReplicaStatusMap[dstReplicaName]; if dstReplicaStatus == nil {replicaStatus := e.ReplicaStatusMap[replicaName]; if replicaStatus == nil {if e.ReplicaStatusMap[dstReplicaName] != nil && e.ReplicaStatusMap[dstReplicaName].Mode != types.ModeERR {
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Find similar patterns of accessing replica mode without nil checks
# Look for direct access to Mode field that might need nil checks
# Search for direct mode access patterns
rg -A 2 'ReplicaStatusMap\[[^]]+\]\.Mode'
# Search for potential nil dereference patterns
ast-grep --pattern 'if $map[$key].$field'
Length of output: 2068
Script:
#!/bin/bash
# Search for all ReplicaStatusMap accesses to ensure we don't miss any patterns
rg -A 3 'ReplicaStatusMap\[' pkg/spdk/
# Also search for function signatures that return or handle ReplicaStatusMap entries
ast-grep --pattern 'func $_($_) (*ReplicaStatus, error)'
Length of output: 5562
Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #252 +/- ##
========================================
- Coverage 8.42% 8.38% -0.05%
========================================
Files 21 21
Lines 7158 7159 +1
========================================
- Hits 603 600 -3
- Misses 6475 6478 +3
- Partials 80 81 +1
Flags with carried forward coverage won't be shown. Click here to find out more. ☔ View full report in Codecov by Sentry. |
longhorn/longhorn-9852 Signed-off-by: Chin-Ya Huang <[email protected]>
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Which issue(s) this PR fixes:
Issue longhorn/longhorn#9852
What this PR does / why we need it:
Fix NPE error.
Special notes for your reviewer:
NoneAdditional documentation or context
None