[mlpack] EXC_BAD_ACCESS in boost

[Li Dong]

Dear Ryan,

I have cleaned MLPACK dependency for debugging, and the program is OK. I can’t figure out what changes caused MLPACK to have such error.

My codes can be cloned by

git clone --recursive https://github.com/dongli/Lady.git 

and it needs Armadillo-4.100 (use 3D field class), and gcc (>= 4.8).

Run:

$ mkdir build
$ cd build
$ cmake ..
$ make demo_testcase
$ ./demo_testcase

will give you ‘Bus error: 10’ and gdb will give you

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x000000010008a500
0x00000001001e0e7b in boost::math::lanczos::lanczos17m64::lanczos_sum<long double> ()

I don’t know if there is any tool to debug such error.

Thank you for helping!

Li

On Mar 19, 2014, at 3:40 AM, Ryan Curtin <gth671b at mail.gatech.edu> wrote:

> On Mon, Mar 17, 2014 at 04:49:00PM +0800, Li Dong wrote:
>> Hi all,
>> 
>> I am using RangeSearch of MLPACK in my program, and it has no problem
>> several days ago. But I made some changes to my codes these days, and
>> encountered the following error in Debug mode:
>> 
>> iMac:Debug dongli$ lldb ./demo_testcase
>> Current executable set to './demo_testcase' (x86_64).
>> (lldb) r
>> Process 84476 launched: './demo_testcase' (x86_64)
>> Process 84476 stopped
>> * thread #1: tid = 0xbf77f, 0x0000000100216e7b libmlpack.1.0.dylib`long double boost::math::lanczos::lanczos17m64::lanczos_sum<long double>(long double const&) + 59, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=2, address=0x10008a500)
>>    frame #0: 0x0000000100216e7b libmlpack.1.0.dylib`long double boost::math::lanczos::lanczos17m64::lanczos_sum<long double>(long double const&) + 59
>> libmlpack.1.0.dylib`long double boost::math::lanczos::lanczos17m64::lanczos_sum<long double>(long double const&) + 59:
>> -> 0x100216e7b:  fstpt  (%rax)
>>   0x100216e7d:  fldt   0x58f4d(%rip)             ; typeinfo name for boost::exception_detail::error_info_injector<std::domain_error> + 128
>>   0x100216e83:  fstpt  0x10(%rax)
>>   0x100216e86:  fldt   0x58f54(%rip)             ; typeinfo name for boost::exception_detail::error_info_injector<std::domain_error> + 144
>> 
>> In Release mode, there is no such error! My platform is Mac OS X
>> 10.9.2, compiler is clang 5.1.0 in Xcode 5.1, boost version is 1.55.0.
>> 
>> Any idea? Thanks in advance!
> 
> What were the changes that you made to your program?
> 
> Two ideas I have might be to try gcc instead of clang, or to try a
> different Boost version.  I don't think either of those is very likely
> to work, though.  If you can paste some code that causes the error, I
> can try to reproduce it; then, we can work towards a solution.
> 
> Thanks,
> 
> Ryan
> 
> -- 
> Ryan Curtin    | "I am."
> ryan at ratml.org |   - Joe

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