Environment
- Device: iPad Pro 11-inch 2nd gen (iPad8,9 / A12X)
- OS: iPadOS 26.5 (23F77)
- Xcode: 26.3
Issue
App crashes with EXC_BREAKPOINT / SIGKILL when user scrolls through a PDF in PDFView on iPadOS 26.5.
Crash Log (ASI)
"BUG IN CLIENT OF LIBPLATFORM: Trying to recursively lock an os_unfair_lock" Abort Cause 259
Root Cause (from .ips)
Two threads deadlock on os_unfair_lock inside CGPDFPageInsertTableDescriptions:
Thread 0 (main): _os_unfair_lock_recursive_abort CGPDFPageInsertTableDescriptions [PDFPageAnalyzerV2 addTablesFromVisionDocument:documentImage:toPage:withBox:]_block_invoke_2 _dispatch_async_and_wait_invoke ← main thread waiting
Thread (PDFKit.PDFDocument.formFillingQueue): _dispatch_sync_f_slow ← background queue waiting for main thread +[PDFPageAnalyzerV2 addTablesFromVisionDocument:documentImage:toPage:withBox:] +[PDFPageAnalyzerV2 analyzePage:withBox:requestTypes:] -[PDFView visiblePagesChanged:] ← triggered by scrolling
PDFPageAnalyzerV2 dispatches_sync back to the main thread from PDFKit.PDFDocument.formFillingQueue, while the main thread is already blocked in dispatch_async_and_wait for the same operation. This results in a recursive lock on os_unfair_lock in CGPDFPageInsertTableDescriptions → SIGKILL.
Notes
- PDFPageAnalyzerV2 appears to be a new iOS 26 Vision-based table analysis feature
- No public API found in PDFKit headers to disable this analysis
- Workaround: pdfView.usePageViewController(true, withViewOptions: nil) appears to reduce frequency of visiblePagesChanged: triggers
Question
Is there an official API to disable PDFPageAnalyzerV2 table analysis on iOS 26? Is this a known issue with a fix planned?
