Deadlock in CGContextDrawPDFPage in iOS8
| Originator: | constantine | ||
| Number: | rdar://18778790 | Date Originated: | 27-Oct-2014 |
| Status: | Open | Resolved: | |
| Product: | iOS | Product Version: | iOS 8 |
| Classification: | Reproducible: | Always |
Steps to Reproduce: 1. Add custom font to XCode project. 2. in application:didFinishLaunchingWithOptions: draw a pdf file into some context. 3. Deadlock. Sample project: https://www.dropbox.com/s/6xuhl2myi03clp6/PDFDeadlock.zip?dl=0 Summary: When project has custom font, application is deadlocked in CGContextDrawPDFPage with following stack: #0 0x38d57540 in semaphore_wait_trap () #1 0x38de2434 in _os_semaphore_wait () #2 0x0018a6fa in dispatch_once_f () #3 0x2b1d1e4e in CGFontCreate () #4 0x2b1d1dbe in CGFontCreateFontsWithPath () #5 0x2b21047e in CGFontCreateFontsWithURL () #6 0x3227df4e in AddFontsFromURLOrPath () #7 0x32281a3a in __Initialize_block_invoke () #8 0x0018a630 in dispatch_once_f () #9 0x3227d7a2 in Initialize () #10 0x001899c6 in _dispatch_client_callout () #11 0x0018a630 in dispatch_once_f () #12 0x2b1d1e4e in CGFontCreate () #13 0x2b20ab4a in CGFontCreateWithDataProviderAndData () #14 0x2b23a87e in CGPDFFontCIDType2Load () #15 0x2b29cb76 in load_font () #16 0x2b29cb4c in load_font () #17 0x2b29cc3c in CGPDFFontGetMutator () #18 0x2b24f372 in draw_glyphs () #19 0x2b2330ee in cid_draw () #20 0x2b232f84 in CGPDFTextLayoutDrawGlyphs () #21 0x2b269074 in op_Tj () #22 0x2b24d4e0 in pdf_scanner_handle_xname () #23 0x2b24d084 in CGPDFScannerScan () #24 0x2b29ce8c in CGPDFDrawingContextDrawPage () #25 0x2b2193fa in pdf_page_draw_in_context () #26 0x2b20840c in CGContextDrawPDFPage () #27 0x00061e36 in -[AppDelegate deadlockWithURL:] #28 0x00047d74 in -[AppDelegate application:didFinishLaunchingWithOptions:] Notes: It only happens on iPhone 5 (Maybe 5S). Calling [UIFont systemFontOfSize:12]; before drawing PDF fixes the problem.
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