Hi Sudheer,
Thanks for the quick response.
I tried with your suggested code snippet but Address sanitizer doesn’t detect
the leak.
I even tried with gdb by introducing break point at __asan_report_error.
Vamsi
> On Nov 10, 2016, at 1:58 PM, Sudheer Vinukonda <sudheervinuko...@yahoo.com>
> wrote:
>
> Not sure if the *leak* in your test code below is detectable..since your
> program is exiting after allocating the memory (system should automatically
> reclaim the memory on process exit).
>
> You may try to modify it to something more explicit like the below -
>
>> #include <stdlib.h>
>> void dummy() {
>> char *c = (char*) malloc(20);
> c = (char*) malloc(100);
>> }
>> int main() {
>> dummy();
>> while(1) {}
>> }
>
>
>
> On Nov 10, 2016, at 1:43 PM, Vamsi Ambati <va...@neumob.com
> <mailto:va...@neumob.com>> wrote:
>
>>
>> I am trying to resolve a memory leak issue with ATS 7.0 version.
>> We are using ATS from the CDN perspective and developed 3 plugins.
>> DevOps complains that traffic_server process gradually consumes lot of
>> memory and does release back which is a sign of memory leak.
>> I tried with Valgrind but it didn’t work because of LUA and one of our ATS
>> community member suggested to use Address Sanitizer.
>> I followed exactly the steps mentioned Debugging Traffic Server using ASAN
>> <https://cwiki.apache.org/confluence/download/attachments/56066455/summit_asan.pptx?version=1&modificationDate=1429916307000&api=v2>.
>>
>> I have build the traffic server with CXXFLAGS=-fno-omit-frame-pointer
>> -fsanitize=address
>> Verified that traffic_server is build with ASAN library by 'ldd
>> bin/traffic_server’
>> Restarted the traffic server with 'service nm-trafficserver restart'.
>>
>> I have adopted three approaches to catch the memory leak
>>
>> Approach 1:
>> Just running the traffic server(with -f option) and continuously sending
>> HTTP requests using wrk (from another machine) by attaching
>> to a gdb .
>> ' gdb $(pidof traffic_server)’
>> break __asan_report_error.
>>
>> Issue: I didn’t hit this function from the memory leak perspective.
>>
>> Approach 2:
>> I have run the traffic server with PROXY_AUTO_EXIT and sending the http
>> requests
>> PROXY_AUTO_EXIT=30 ASAN_OPTIONS=detect_leaks=1:verbosity=2
>> bin/traffic_server -f
>>
>> Issue: Tool didn’t complain any thing about the memory leak.
>>
>>
>> Approach 3:
>> I have created simple code explicitly introducing the memory leak
>>
>> #include <stdlib.h>
>> void dummy() {
>> malloc(20);
>> }
>> int main() {
>> dummy();
>> return 0;
>> }
>>
>> Compiled with g++ -fsanitize=address add.cpp
>> Executed like ASAN_OPTIONS=detect_leaks=1 ./a.out
>>
>> Issue: Tool didn’t detect this memory leak.
>>
>>
>> Production System Configuration:
>>
>> 16Gb Ram with 8 cores VM.
>> gcc --version
>> gcc (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4
>>
>> Did any one encounter this ASAN issue on Ubuntu 14.04 ? If so, how did
>> they resolve it ?
>> Any other suggestions how to narrow down the memory leak issue with ATS ?
>>
>>
>>
>> Regards
>> Vamsi
>>
>> PS: I am new to the community and new to Apache traffic server open source
>> module too.
>>
>>
>>
>>
