printf - Access violation while running app via windbg -

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my application access violation sometimes. runned application through windbg, , stopped in following function . tried _vscprintf instead of vsnprintf, , result same. 'm newbie windbg. appreciated. 

int tsk_sprintf_2(char** str, const char* format, va_list* ap) {     int len = 0;     va_list ap2;     ap2 = *ap;     len = vsnprintf(0, 0, format, *ap); /*-> access violation in point! */    *str = (char*)calloc(1, len+1);    vsnprintf(*str, len, format, ap2);    va_end(ap2);        return len; }

==> following result windbg

managed_stack: !dumpstack -ee  os thread id: 0x5b8 (22)  current frame:  childebp retaddr  caller, callee primary_problem_class:  wrong_symbols bugcheck_str:  application_fault_wrong_symbols last_control_transfer:  1026d3d8 102e14cf  stack_text:       warning: stack unwind information not available. following frames may wrong.      1d3cde7c 1026d3d8 1d3cdea8 0898eeeb 00000000 msvcr100d!vcwprintf_s_l+0x52ef     1d3cded0 1026d46c 00000000 00000000 0898ee88 msvcr100d!vsnprintf_l+0x158     1d3cdeec 0834d927 00000000 00000000 0898ee88 msvcr100d!vsnprintf+0x1c     1d3cdfe8 1002891e 1d3ce0d0 0898ee88 1d3ce1e4 tinysak!tsk_sprintf_2+0x57     1d3ce0f0 10028b77 09a16fe8 0898ee88 00000000 tinywrap!debug_xxx_cb+0x6e     1d3ce1ec 088b697b 09a16fe8 0898ee88 00000444 tinywrap!ddebugcallback::debug_info_cb+0x37     1d3cffb4 7c80b713 1cd10f90 1d2cfb44 7c947d9a tinynet!tnet_transport_mainthread+0x1adb     1d3cffec 00000000 088a2aff 1cd10f90 00000000 kernel32!getmodulefilenamea+0x1b4  symbol_stack_index:  0 symbol_name:  msvcr100d!vcwprintf_s_l+52ef followup_name:  machineowner  module_name: msvcr100d image_name:  msvcr100d.dll stack_command:  ~22s ; kb bucket_id:  wrong_symbols failure_bucket_id:  wrong_symbols_c0000005_msvcr100d.dll!vcwprintf_s_l watson_stageone_url:   followup: machineowner ---------   route.

you're attempting print null pointer: len = vsnprintf(0, 0, format, *ap);; of course, crash. send valid address of output buffer first parameter , valid length second.


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