On Jun 17, 2011, at 15:22, Greg Parker wrote: > 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.
Thanks for the speedy reply, Greg. What do you mean exactly by "invalid"? Bad pointers? Pointers on instances of different classes? Or both? -Laurent. -- Laurent Daudelin AIM/iChat/Skype:LaurentDaudelin http://www.nemesys-soft.com/ Logiciels Nemesys Software laur...@nemesys-soft.com _______________________________________________ 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
