On Jun 17, 2011, at 2:40 PM, Laurent Daudelin wrote: > One of my user sent me a crash log with an excerpt here: > > ... > Exception Type: EXC_BAD_ACCESS (SIGSEGV) > Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000027 > ... > Thread 4 Crashed: Dispatch queue: com.apple.root.default-priority > 0 libobjc.A.dylib 0x00007fff85ea115c objc_msgSend_vtable2 > + 12 > 1 com.apple.Foundation 0x00007fff827f79a5 -[NSCFString > isEqualToString:] + 63 > ... > > It's a part of my code that compares NSStrings. Of course, nobody besides him > are able to reproduce this. > > My question: what could cause a crash in function 'objc_msgSend_vtable2'?
Short answer: for any of the same reasons that cause a crash in objc_msgSend(). The vtable versions of objc_msgSend() are specialized optimizations for a few of the most frequently-called methods. objc_msgSend_vtable2 is currently optimizing the -class method. Presumably one of the two string objects was invalid and -isEqualToString: was trying to check which class the bad object belonged to. -- Greg Parker gpar...@apple.com Runtime Wrangler _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
