Re: [Caml-list] memory corruption using C stub

[David Allsopp <dra-news@metastack.com>]

> On 11 Jun 2017, at 12:38, Alexey Egorov <alex.only.d@gmail.com> wrote:
> 
> OK, I'm minimized this function as much as possible and it's still
> crashing - https://pastebin.com/MZ0Qkh9B
> Now I'm thinking that is compiler's bug on windows...

Are you able to post the OCaml side of your minimised code? Which port of OCaml are you using?


David


> 2017-06-10 20:33 GMT+05:00 Alexey Egorov <alex.only.d@gmail.com>:
>> Hello,
>> 
>> I have an OCaml application with some C code which (I believe) is the
>> reason of some random crashes.
>> 
>> Here is the code - https://pastebin.com/FVtLphZu
>> This function reads file at given offset, divides data into chunks and
>> compute checksums and compression ratio:
>>  external compute_data_props
>>    : string -> int -> int -> int -> (int * int * float) list =
>> "compute_data_props"
>> 
>> The problem is, after some calls to this stub, application is crashing
>> at random places in OCaml code.
>> I can't figure out what's going wrong, but replacing this stub with
>> dummy function (which does nothing but returns some predefined list)
>> eliminates the problem.
>> 
>> What can we do to debug it? We are using OCaml 4.04.1 and Windows 10,
>> and there is no other C stubs in our codebase.
>> 
>> Thanks!
> 
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