I just noticed something I didn't see before, namely that the doco says to call asl_open once for each thread, which I'm not doing. I guess this most likely is the cause.
________________________________ From: Jeremy Pereira <a...@jeremyp.net> To: Chris Idou <idou...@yahoo.com>; Cocoa Forum <cocoa-dev@lists.apple.com> Cc: Jeremy Pereira <a...@jeremyp.net> Sent: Fri, 20 November, 2009 9:35:01 PM Subject: Re: asl_log aborts the program? On 20 Nov 2009, at 06:33, Chris Idou wrote: > > > I've got a report from a user of my program crashing. > > In the console they are getting this: > > 11/19/09 3:08:46 PM[0x0-0x18a18a]Progname[8699]Progname(8699,0x1167b0000) > malloc: *** error for object 0x100563870: pointer being freed was not > allocated > 11/19/09 3:08:46 PM[0x0-0x18a18a] Progname[8699]*** set a breakpoint in > malloc_error_break to debug > > > Thread 2 Crashed: > 0 libSystem.B.dylib 0x00007fff87a7784d usleep$NOCANCEL + 0 > 1 libSystem.B.dylib 0x00007fff87a96e3c abort + 93 > 2 libSystem.B.dylib 0x00007fff879ae155 free + 128 > 3 libSystem.B.dylib 0x00007fff879fa16e asl_set_query + 572 > 4 libSystem.B.dylib 0x00007fff87a16239 asl_send + 824 > 5 libSystem.B.dylib 0x00007fff87a15e56 asl_vlog + 570 > 6 libSystem.B.dylib 0x00007fff87a15c19 asl_log + 153 > 7 Progname.CocoaTools 0x0000000104567101 -[Log > vlogLevel:format:arguments:] + 270 > 8 Progname.CocoaTools 0x000000010456730c -[Log notice:] + 164 > ....etc > > Does this look like an Apple bug? It looks to me like the asl subsystem is > freeing something it shouldn't and aborting the program. > Normally when I see crashes involving calls to methods with format strings, I immediately assume that the arguments following the the format string do not match the format specifiers in the format string. e.g. if -[Log notice:] is declared like this -(void) notice: (NSString*) format, ...; [log notice: @"blah blah blah %@ %s", "blah"]; The above line has an NSObject missing from its argument list. There's also [log notice: someNSStringofIndeterminateOrigin]; which may crash if the string contains format specifiers e.g. if it is a URL with % escapes in it. So you probably want to check your calls to -[Log notice:]. > > > __________________________________________________________________________________ > Win 1 of 4 Sony home entertainment packs thanks to Yahoo!7. > Enter now: http://au.docs.yahoo.com/homepageset/ > _______________________________________________ > > 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/adc%40jeremyp.net > > This email sent to a...@jeremyp.net ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ __________________________________________________________________________________ Win 1 of 4 Sony home entertainment packs thanks to Yahoo!7. Enter now: http://au.docs.yahoo.com/homepageset/ _______________________________________________ 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
