malloc: *** error: incorrect checksum for freed object - object was probably modified after being freed

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I have a big problem with my iOS App: it crashes sometimes without detailed debug error. The stack trace is empty. These are the only two lines in the stack trace:

  1. crash start in UIApplicationMain at "symbol stub for: -[_UIHostedTextServiceSession dismissTextServiceAnimated:]".
  2. and report "libsystem_c.dylib`malloc_error_break".

in com.apple.main-thread.

The error on Xcode debugger (with connected device):

malloc: *** error for object 0x208a7614: incorrect checksum for freed object - object was probably modified after being freed.
*** set a breakpoint in malloc_error_break to debug

I have set a breakpoint in malloc_error_break with libsystem_c.dylib without any feedback from debugger. I have no idea to solve this issue.

To find the source of the problem, in Xcode go to Product > Scheme > Edit Scheme, and under Diagnostics tab enable all the Malloc settings and Guard Malloc.

With that, run your application again, and Xcode will stop at the line causing the problem.

Incorrect checksum for freed object on malloc, malloc: *** error for object 0x1001012f8: incorrect checksum for freed object - object was probably modified after being freed. *** set a� [layer1.c:172] error: Aborting layer I decoding after step one. [layer1.c:30] error: Illegal bit allocation value. [layer1.c:172] error: Aborting layer I decoding after step one. Warning: Big change (MPEG version, layer, rate). Frankenstein stream? Note: Illegal Audio-MPEG-Header 0x00000000 at offset 4455. Note: Trying to resync

Since you're in the debugger, you should look at the memory location 0x208a7614 and see what's there. The data in memory may be helpful in figuring out what's going wrong.

What's happening is one of the following:

  1. you are freeing an object twice,

  2. you are freeing a pointer that was never allocated

  3. you are writing through an invalid pointer which previously pointed to an object which was already freed

Since the stack trace is coming up empty, it might be useful to add some debugging log statements to your code at various places to see if you can narrow down where in the code the problem lies. Using the memory tools in Instruments might also help. You could try turning on NSZombies, but this looks like a C allocation problem and not an Objective-C one.

Also, is anything else written to the console before the crash? If so, it may point you to where the problem is coming from.

object was probably modified after…, malloc: *** error for object 0x102801008: incorrect checksum for freed object - object was probably modified after being freed. *** set a breakpoint in� malloc: *** error: incorrect checksum for freed object - object was probably modified after being freed 0 Why might it appear that two memory locations are altered after using malloc() & free()?

hi guys i have found this solution if you are using nib or xib interface and you facing this problem when you want to push a viewcontroller object then some time this error will occur and your app will be crash (specially error in iPad) Here is the solution:

// Format like this

UINavigationController *nav=[[UINavigationController      alloc]initWithRootViewController:yourViewControllerObj];

[self.navigationController  presentViewController:nav animated:true completion:nil];

Don't try to push in this condition.

Memory allocation error, Memory allocation error - incorrect checksum for freed object #871 checksum for freed object 0x104819200: probably modified after being freed. Corrupt value: 0x1baffed00baffedf node(65675,0x1091595c0) malloc: *** set� malloc: *** error: incorrect checksum for freed object – object was probably modified after being freed Posted by: admin December 28, 2017 Leave a comment Questions:

If you have this problem. go to: product->scheme->diagnosis-> then enable mollic gaurd edge and zombie object then close then go product->stop then again product-build and run. best ofluck

Incorrect checksum for freed object, Incorrect checksum for freed object - object was probably modified after via getBinIndex/getBinValue I occasionally get the following native error: java(19594, 0x70000021a000) malloc: *** error for object 0x7fc6a966a258: incorrect checksum for freed I won't be able to fix something that isn't broken! malloc: *** error: incorrect checksum for freed object - object was probably modified after being freed 1 C: core dump when I try to pass my struct into a queue

[SOLVED] "incorrect checksum for freed object" when loading Song , mono(811,0xa36e8000) malloc: *** error for object 0x79e57384: incorrect checksum for freed object - object was probably modified after being freed. *** set a� Same answer, really - something is corrupting memory. The PRINT just happens to be the place it gets reported. Same advice as I gave earlier.

In the 2.0.0-RC1, can you try commenting out lines 280 and 281 in send.c (the call to log_debug).I still can't seem to reproduce on my machine, but I have a guess as to what's happening.

* set a breakpoint in malloc_error_break to debug Mas não estou fazendo nenhum free. A situação é a seguinte: estou trabalhando com uma arvore AVL, a primeira vez que tento inserir um elemento na arvore, funciona tranquilamente.

Comments
  • This is hard. You basically have to inspect the code to find the problem. If you can figure out what kind of object is involved, that helps a lot. (BTW, ARC or manual reference counting?)
  • I'm pretty sure the only utility of setting a breakpoint in malloc_error_break is that it'll give you a chance to look at the corrupted freed object, and the content of the memory may help you trace the point where you're overwriting it.
  • It's a C++ library an the project it's MRC.
  • My friend compiled my C code on a Mac, and it gave this error on runtime. However, it compiled and ran just fine on Linux. It seems to be a Mac-specific issue.
  • Try just clean the project CMD+SHIFT+K. it helped :)
  • It's worth pointing out that Guard Malloc is only available in the simulator and not on a real device. See: developer.apple.com/library/ios/documentation/Performance/…
  • dyld: could not load inserted library '/usr/lib/libgmalloc.dylib' because image not found
  • Enable Guard Malloc worked for me although it's worth noting that it appeared to slow down the simulator significantly, thus I would only turn it on when debugging an actual issue.
  • There's a third possibility suggested by the error message: OP is writing through an invalid pointer which previously pointed to an object which was already freed.
  • Ah, good point. I was thinking the error was displaying on a call to free(), but it's on a call to malloc(). Good catch. I'll update the text to reflect that.
  • Fourth possible cause: Writing past the end of an allocated block into another, currently-unallocated block.
  • If Zombies don't catch anything then Guard Malloc may be able to help.
  • This answer is what saved me in my C program. I had accidentally allocated too small of an array to hold a sprintf result somewhere else in my code. Checking the memory address told me exactly which was the offending string because I was able to recognize its content.