Malloc error break

set a breakpoint in malloc_error_break to debug

For me here getting error :

Like this: malloc: * error for object 0x7f8480743a00: pointer being freed was not allocated * set a breakpoint in malloc_error_break to debug

After adding malloc_error_break in Symbolic Breakpoint in Breakpoint Navigator getting same error

2 Answers 2

For memory errors of this sort, ASAN (address sanitizer) can often be a helpful tool. It instruments your code so that it can catch incorrect uses of malloc & free where they happen, rather than later when they blow up. And it records the history of allocation & free events for a given address, so for instance if you had a double free, it would show you both free points.

You turn this on by editing the Run Scheme in Xcode, going to the Diagnostics tab, and turning on Address Sanitizer. This will require a rebuild, and the instrumented binaries will run a little slower, but generally not so much slower that you can’t get your program to the point of failure.

You can set a single «all exceptions breakpoint» like you can see here Exception Breakpoint in Xcode to find where the exception really comes from.

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Debugging in VS Code with lldb, how do I set a breakpoint on a symbol I don’t have source for?

I have some kind of memory management bug that, of course, happens randomly every 3 days or so under 100% load. This is on OSX, but it’s all plain, portable C++11:

I’m using Visual Studio Code and the debugger is lldb; what I do not know is -how- to set a breakpoint on malloc_error_break so I can look at the call stack when it happens.

VS Code lets you set breakpoints at source code lines, but I do not have source code for that system library code, just the symbol. But if I could break there, regardless of not having source for that function, I could inspect the call stack.

So, how to set a breakpoint in lldb under Visual Studio Code on OSX High Sierra at an arbitrary symbol without source code?

3 Answers 3

If you go to Debug->New Breakpoint->Function Breakpoint, you can add this breakpoint by entering the function name (malloc_error_break).

Not sure about the Visual Studio Code part, but in lldb you can do it with:

Eventhough the question is quite old I think it might still be interesting for others. Also, I’m assuming you actually want to do what your code is telling you to do (set a breakpoint in malloc_error_break) as opposed to the more general task of ‘setting a breakpoint on a symbol you don’t have source for’. If that’s the case, consider updating your question title ac

@buszkiraly’s answer is close, but actually related to Visual Studio. In Visual Studio Code you find the setting in the menu under Run > New Breakpoint > Function Breakpoint . However, this only seems to do anything if you already have an active debugging session!

If you do have one open, you can also just click on the + icon in the lower left corner.

In both cases you should see something like the image below

Then just type malloc_error_break and hit enter to get.

Now running your code with a debugger attached should break when reaching the

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How to find the cause of a malloc «double free» error?

I’m programming an application in Objective-C and I’m getting this error:

MyApp(2121,0xb0185000) malloc: *** error for object 0x1068310: double free
*** set a breakpoint in malloc_error_break to debug

It is happening when I release an NSAutoreleasePool and I can’t figure out what object I’m releasing twice.

How do I set his breakpoint?

Is there a way to know what is this «object 0x1068310»?

13 Answers 13

When an object is «double-freed», the most common cause is that you’re (unnecessarily) releasing an autoreleased object, and it is later autoreleased when the containing autorelease pool is emptied.

I’ve found that the best way to track down the extra release is to use the NSZombieEnabled environment variable for the affected executable in Xcode. For a quick rundown of how to use it, check out this CocoaDev wiki page. (In addition to this page, Apple has documented some incredibly obscure yet useful tips for debugging code in Xcode, some of which have saved my bacon more than a few times. I suggest checking out this Technical Note on developer.apple.com — link jumps to the section on Cocoa’s Foundation framework).

Edit: You can often track the offending object down within the Xcode debugger, but it’s often much easier if you use Instruments to assist you. From Xcode, choose Run → Start With Performance Tool → Object Allocations and you should be able to trace the offending object back to where it was created. (This will work best if you’re enabled zombies as discussed above.) Note: Snow Leopard adds a Zombies tool to Instruments, accessible from the Run menu as well. Might be worth the $29 alone! 😉

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how to set a breakpoint malloc_error_break lldb

When i run my program, I have this error :

a.out(56815,0x10bb2c5c0) malloc: *** error for object 0x7fe5ea402a90: pointer being freed was not allocated a.out(56815,0x10bb2c5c0) malloc: *** set a breakpoint in malloc_error_break to debug

how i can set a breakpoint to malloc_error_break with lldb ?

thanks for the help

1 Answer 1

is the lldb command for setting a breakpoint by symbol name.

That breakpoint will stop you at the point where the errant free occurred, which is some information. It may be for instance that you have a code path where you don’t initialize something that you later free. The backtrace when you hit malloc_error_break will show you what you are trying to free, so you can trace back why it didn’t get initialized.

If the problem ends up being more complicated (a double-free for instance), that’s going to be a little harder to track down from the stop point, since you can’t tell from there where the first free was. In that case, it’s definitely worthwhile to rebuild your program with ASAN enabled and run it again in the debugger. In the case of double free’s and such-like since ASAN records the whole malloc history of the program, it can tell you every time the errant pointer was handled by the malloc system, making the error easier to spot. It also does a bunch of pre-flight checks and can often catch memory errors early on. And at a surprisingly small performance cost as well.

There’s more on ASAN here:

If it’s too difficult to rebuild with ASAN you can use the MallocStackLoggingNoCompact environment variable and then use the malloc_history program to print the errors. There’s more info about that in the «malloc» manpage, e.g.:

But if you are planning to do more than a little development, it’s a good idea to get familiar with ASAN. It makes tracking down allocation & deallocation errors much easier.

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Getting Error : malloc: *** error for object 0xc79e430: double free *** set a breakpoint in malloc_error_break to debug

I am getting this error in my iPhone app.

Error : DemoApp(1874,0xb024f000) malloc: * error for object 0xc79e430: double free * set a breakpoint in malloc_error_break to debug

In that View I am using JSON code and after parsing data displayed accordingly but after few minutes application gets crashed. Can any one help me. Thank your

2 Answers 2

For any EXC_BAD_ACCESS or double free errors, you are usually trying to send a message to a released object. The BEST way to track these down is use NSZombieEnabled.

This works by never actually releasing an object, but by wrapping it up as a «zombie» and setting a flag inside it that says it normally would have been released. This way, if you try to access it again, it still know what it was before you made the error, and with this little bit of information, you can usually backtrack to see what the issue was.

It especially helps in background threads when the Debugger sometimes craps out on any useful information.

VERY IMPORTANT TO NOTE however, is that you need to 100% make sure this is only in your debug code and not your distribution code. Because nothing is ever release, your app will leak and leak and leak. To remind me to do this, I put this log in my appdelegate:

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Wondering if any progress was made with this? I’m getting the same error.

I’m running rails 3.0.9, ruby 1.9.2, spork 0.9.0.rc9, osx lion.

This is the kind of output I’m seeing in the spork terminal.

Spork is ready and listening on 8989!
Running tests with args ["--color", "--format", "doc", "spec/controllers/users/user_clinical_trials_controller_spec.rb"]...
ruby(22457,0x104ab2000) malloc: *** error for object 0x7fd5818864d0: incorrect checksum for freed object - object was probably modified after being freed.
*** set a breakpoint in malloc_error_break to debug
Done.

As a side note, I’m actually trying to do an upgrade on a code base from ree 1.8.7. The specs seem to run fine in the normal process but crash with the above message on almost every run of particular specs when using spork. There doesn’t, however, seem to be a consistent point where this happens, it’s a bit random. Most of the time it just exits the test run with no output in the client terminal, but as noted the above is displayed in the server terminal. Occasional, the entire spork process with exit, below is some output I took from one of the times this happened.

-- control frame ----------
c:0012 p:---- s:0046 b:0046 l:000045 d:000045 CFUNC  :raise
c:0011 p:0083 s:0042 b:0042 l:001820 d:001820 METHOD /Users/blake/.rvm/gems/ruby-1.9.2-p290/gems/spork-0.9.0.rc9/lib/spork/forker.rb:50
c:0010 p:0055 s:0038 b:0038 l:001610 d:001610 METHOD /Users/blake/.rvm/gems/ruby-1.9.2-p290/gems/spork-0.9.0.rc9/lib/spork/run_strategy/forking.rb:17
c:0009 p:0048 s:0032 b:0032 l:000031 d:000031 METHOD /Users/blake/.rvm/gems/ruby-1.9.2-p290/gems/spork-0.9.0.rc9/lib/spork/server.rb:48
c:0008 p:0098 s:0025 b:0025 l:000024 d:000024 METHOD /Users/blake/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/drb/drb.rb:1558
c:0007 p:0146 s:0021 b:0021 l:000020 d:000020 METHOD /Users/blake/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/drb/drb.rb:1518
c:0006 p:0042 s:0017 b:0017 l:0003c8 d:000016 BLOCK  /Users/blake/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/drb/drb.rb:1592
c:0005 p:---- s:0012 b:0012 l:000011 d:000011 FINISH
c:0004 p:---- s:0010 b:0010 l:000009 d:000009 CFUNC  :loop
c:0003 p:0068 s:0007 b:0007 l:0003c8 d:000006 BLOCK  /Users/blake/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/drb/drb.rb:1588
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:---- s:0002 b:0002 l:000001 d:000001 TOP
---------------------------
-- Ruby level backtrace information ----------------------------------------
/Users/blake/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/drb/drb.rb:1588:in `block in main_loop'
/Users/blake/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/drb/drb.rb:1588:in `loop'
/Users/blake/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/drb/drb.rb:1592:in `block (2 levels) in main_loop'
/Users/blake/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/drb/drb.rb:1518:in `perform'
/Users/blake/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/drb/drb.rb:1558:in `perform_without_block'
/Users/blake/.rvm/gems/ruby-1.9.2-p290/gems/spork-0.9.0.rc9/lib/spork/server.rb:48:in `run'
/Users/blake/.rvm/gems/ruby-1.9.2-p290/gems/spork-0.9.0.rc9/lib/spork/run_strategy/forking.rb:17:in `run'
/Users/blake/.rvm/gems/ruby-1.9.2-p290/gems/spork-0.9.0.rc9/lib/spork/forker.rb:50:in `result'
/Users/blake/.rvm/gems/ruby-1.9.2-p290/gems/spork-0.9.0.rc9/lib/spork/forker.rb:50:in `raise'

-- C level backtrace information -------------------------------------------
0   libruby.1.9.1.dylib                 0x0000000109a695c2 rb_vm_bugreport + 210
1   libruby.1.9.1.dylib                 0x0000000109922e64 report_bug + 372
2   libruby.1.9.1.dylib                 0x0000000109923028 rb_bug + 200
3   libruby.1.9.1.dylib                 0x000000010992366e rb_bug_errno + 1598
4   libruby.1.9.1.dylib                 0x0000000109a6effa thread_raise_m + 186
5   libruby.1.9.1.dylib                 0x0000000109a64ad3 vm_call_method + 931
6   libruby.1.9.1.dylib                 0x0000000109a4fe63 vm_exec_core + 4739
7   libruby.1.9.1.dylib                 0x0000000109a58923 vm_exec + 1507
8   libruby.1.9.1.dylib                 0x0000000109a66e61 loop_i + 561
9   libruby.1.9.1.dylib                 0x0000000109928017 rb_rescue2 + 519
10  libruby.1.9.1.dylib                 0x0000000109a4bb26 rb_f_loop + 54
11  libruby.1.9.1.dylib                 0x0000000109a64ad3 vm_call_method + 931
12  libruby.1.9.1.dylib                 0x0000000109a4fe63 vm_exec_core + 4739
13  libruby.1.9.1.dylib                 0x0000000109a58923 vm_exec + 1507
14  libruby.1.9.1.dylib                 0x0000000109a59c9d rb_vm_invoke_proc + 877
15  libruby.1.9.1.dylib                 0x0000000109a71109 thread_start_func_2 + 1673
16  libruby.1.9.1.dylib                 0x0000000109a712cd thread_start_func_1 + 29
17  libsystem_c.dylib                   0x00007fff8d24d8bf _pthread_start + 335
18  libsystem_c.dylib                   0x00007fff8d250b75 thread_start + 13

Click here follow the steps to fix Malloc_error_break C and related errors.

Instructions

Note:
This article was updated on 2023-02-03 and previously published under WIKI_Q210794

What is Malloc_error_break C error?

The Malloc_error_break C error is the Hexadecimal format of the error caused. This is common error code format used by windows and other windows compatible software and driver vendors.

This code is used by the vendor to identify the error caused. This Malloc_error_break C error code has a numeric error number and a technical description. In some cases the error may have more parameters in Malloc_error_break C format .This additional hexadecimal code are the address of the memory locations where the instruction(s) was loaded at the time of the error.

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The Malloc_error_break C error may be caused by windows system files damage. The corrupted system files entries can be a real threat to the well being of your computer.

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