https://bugs.documentfoundation.org/show_bug.cgi?id=172160
--- Comment #4 from [email protected] --- Bug Report / Case Synopsis Environment: OS: Windows 11 Home (64-bit, Version 25H2, Build 26200.8457) Hardware: Intel Core i3-8100 CPU @ 3.60GHz, 8.00 GB RAM Storage: Local Dual-Drive System (SSD + HDD configuration) Original LibreOffice Behavior: Working within a large Master Document (.odm) managing approximately 37 sub-documents (.odt), totaling over 110,000 words. Description of Event & Symptoms Abrupt Un-linking of Sub-Documents: During an active local writing and editing session, approximately 10 individual sub-documents suddenly vanished entirely from the Navigator hierarchy panel. The files were verified to be completely intact on the local file system, but the Master Document completely dropped their references from its active index. UI Rendering and Focus Failures: Subsequent attempts to reload the Master Document (.odm) resulted in severe interface lockups. The Navigator panel interface lost its "Master Document View" capabilities. Crucial structural tools—including the Insert (File) icon and chronological arrangement arrows—disappeared or became completely greyed out, even though the window title bar explicitly identified the file extension as .odm. Sub-document Focus Trap: When forced to open via recovery, the UI erroneously trapped the main viewing window in a read-only view of a single blank sub-document section, misreporting the global document statistics as 0 words, 0 characters on Page 1 of 1, despite the underlying .odm file structure still retaining a size profile consistent with its cached data. Technical Artifacts & Suspected Root Cause Registry Corruption: Investigation into the user profile directories revealed that the master configuration file registrymodifications.xcu was forced to do a background write operation immediately preceding the crash. File Inspection: Upon opening the updated registrymodifications.xcu file in a text editor, severe formatting anomalies and non-textual "hash/garbage data" were present in the middle of the XML document layout, indicating an interrupted or corrupted plain-text write operation. Race Condition / Cloud Lock: The directory containing the .xcu file exhibited an active green checkmark overlay from a background file synchronization/backup utility. It is highly suspected that a microsecond race condition occurred: LibreOffice attempted a massive plain-text configuration write while the system sync utility simultaneously locked the file for indexing, causing a catastrophic memory flush that truncated the Master Document's UI pointers. Current Status The user has bypassed the corrupted document environment by performing a clean upgrade to LibreOffice 26.2.3 (Windows x86-64) and recreating the master framework from scratch to maintain workflow continuity. Because the original environment has been altered, the corrupted configuration file has been isolated, and the workflow has shifted to the updated version, no further debugging steps, log captures, or reproduction trials can be provided by the reporter for this specific ticket instance. The QA team may close this ticket or use these notes to investigate background file-locking vulnerabilities during intense .xcu write actions. -- You are receiving this mail because: You are the assignee for the bug.
