Fix Blackboard thread-safety bugs and XML null pointer dereference#1116
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facontidavide merged 4 commits intomasterfrom Feb 9, 2026
Merged
Fix Blackboard thread-safety bugs and XML null pointer dereference#1116facontidavide merged 4 commits intomasterfrom
facontidavide merged 4 commits intomasterfrom
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New control node that executes a try-child and, on failure, runs a catch-child as recovery. Supports configurable catch_on_halt behavior, async children, and re-entry after RUNNING states. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Add null check for subtree_id when <SubTree> in <TreeNodesModel> is missing the ID attribute — now throws descriptive RuntimeError instead of crashing with UB (null pointer as map key) - Fix variable name shadowing: rename inner-loop 'name' to 'port_name' to avoid shadowing the outer structured binding Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Fix 6 data races in Blackboard, verified with ThreadSanitizer (clang-21): - set() new-entry path: wrote value/sequence_id/stamp without entry_mutex after createEntryImpl — add scoped_lock on entry_mutex - set() existing-entry path: held raw reference after unlocking storage_mutex_, risking use-after-free if concurrent unset() erases the entry — copy shared_ptr before unlocking - cloneInto(): read/wrote entry members without entry_mutex — add scoped_lock on src and dst entry mutexes - ImportBlackboardFromJSON(): wrote entry->value without any lock — add scoped_lock on entry_mutex - debugMessage(): iterated storage_ without storage_mutex_ — add unique_lock - getKeys(): iterated storage_ without storage_mutex_ — add unique_lock Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Switch storage_mutex_ from std::mutex to std::shared_mutex so that concurrent readers (getEntry, getKeys, debugMessage, set initial lookup, cloneInto snapshot) no longer block each other. Write operations (createEntryImpl, unset, clear, cloneInto insert/erase) still take exclusive locks. Also remove the dead entry_mutex_ recursive_mutex and its deprecated entryMutex() accessor — no callers exist in the codebase. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
set()new-entry path: missingentry_mutexlock when writing value/sequence_id/stampset()existing-entry path: use-after-free risk from raw reference afterstorage_mutex_unlockcloneInto(): missing per-entry locks when copying entry members + lock-order inversion (potential deadlock) betweenstorage_mutex_andentry_mutex— restructured into 3-phase approach that never holds both locks simultaneouslyImportBlackboardFromJSON(): unprotected write toentry->valuedebugMessage(): iteratesstorage_withoutstorage_mutex_getKeys(): iteratesstorage_withoutstorage_mutex_loadSubtreeModelnull pointer dereference when<SubTree>in<TreeNodesModel>is missing theIDattributeloadSubtreeModelTest plan
RuntimeErrorinstead of crashing🤖 Generated with Claude Code