Memory allocation problems on RHEL 6.3 kernel version 2.6.32-279.el6.x86_64

[shhuiw]

Some info needed:
*  Output of 'getconf PAGESIZE' [or PAGE_SIZE] on 2 systems
*  Output of 'free' before and after the application run on the 2 systems
*  Output of 'top' on the 2 systems
*  Does the application call mlock on the mmaped area?

--

Regards,
shhuiw




At 2014-07-14 03:04:50, "Amit Agarwal" <amit at amit-agarwal.co.in> wrote:
>On 14-07-2014 12:20, shhuiw wrote:
>> Will you please show us your application code, if possible? Or at 
>> least the mmap part.
>The application code is proprietary, so I cannot disclose that.
>
>For the mmap part, we are not doing mmap explicitly in our code, rather 
>the binary is linked to some dynamic library (here in the strace that I 
>took, it was oracle client).  Application crashes while doing mmap for 
>the oracle library, here is the trace:
>
>
>----- Call Stack Trace -----
>calling              call     entry                argument values in hex
>location             type     point                (? means dubious value)
>-------------------- -------- -------------------- 
>----------------------------
>mmap(offset=33230848, len=2068480) failed with errno=12 for the file 
>./libclntsh.so.11.1
>mmap(offset=33230848, len=2068480) failed with errno=12 for the file 
>./libclntsh.so.11.1
>kpedbg_dmp_stack()+  call     556FC244             FFE3D814 ? 0 ?
>219
>kpeDbgCrash()+72     call     556F06E4             0 ? 5 ? FFE3D8E4 ? 
>A42C90 ?
>                                                    4 ? FFE3D890 ?
>56AA4FDF             call     55701184             0 ? 5 ? 56E2AEFC ? 2 
>? 4 ?
>                                                    50 ? 4 ? FFE3E8FD ?
>56785C74             call     00000000             FFE3D8F4 ? 56F27E60 ?
><stripped>  signal   00000000             B ? FFE3EDAC ? FFE3EE2C ?
>PKc()+255
><stripped>  call     _ZN11CThreadDataC1E  FFE3F2C8 ? FFE3F32E ? 13 ?
><stripped>           PKc()                5720C14A ? 57144297 ? 0 ?
>)+127
>start_thread()+201   call     00000000             92ECDD8 ? FFE3FB70 ?
>                                                    FFE3FB70 ? FFE3FB70 ?
>clone()+94           call     00000000             FFE3FB70 ? 0 ? 0 ? 0 
>? 0 ?
>                                                    0 ?
>
>We have tried by reducing the footprint for our application by 
>decreasing the application caching of some data and see that the 
>application can come up properly until the VIRT in top command output is 
>about 2.8GB after which application starts crashing.
>
>> So that we can figure out the testcase to reproduce on our boxes.
>
>-- 
>Thanks,
>-aka
>http://blog.amit-agarwal.co.in
>
>
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