Re: segmentation violations

Hi Fred,

Are you able to post the code that is causing the problem? And of course,
the age old question: what did you change? :-) That may help diagnose why
this has turned up now -- and potentially help resolve the problem for
others as well.

Anthony

On Mon, Oct 24, 2016 at 4:50 PM, Fred Yankowski <[email protected]> wrote:

> Last week I started getting segmentation-violation crashes from cx_Oracle
> after using it without problems for years. I cannot figure out what changed
> and broke things. I hope you all can help me fix it.
>
> I'm testing with a fresh installation of cx_Oracle with the latest Oracle
> client libs that I could find:
>
> OS:  RHEL 6.8
>
> Python:  2.7.8, built from source.
>
> cx_Oracle: 5.2.1
>
> Oracle instantclient libs: 12.1.0.2.0
>
>
> What I'm seeing now via a simple test driver is that the first call to
> cx_Oracle.connect() works. I'm able to get a cursor, execute the query, and
> get the results. But when I call connect() a second time I get a SIGSEGV.
> When I run the test driver different times I get slightly different errors.
>
> ORA-24550: signal received: [si_signo=11] [si_errno=0] [si_code=1]
> [si_int=0] [si_ptr=(nil)] [si_addr=0x870000]
> *** glibc detected *** python: free(): invalid pointer: 0x000000000073c150
> ***
>
>
> Or
>
>
> ORA-24550: signal received: [si_signo=11] [si_errno=0] [si_code=1]
> [si_int=0] [si_ptr=(nil)] [si_addr=0x354]
> *** glibc detected *** python: double free or corruption (out):
> 0x00000000006f5f40 ***
>
>
> When I enable faulthandler I get a short trace in my test driver python
> code that just shows it failing in the connect() call.
>
>
> When I load the core file into gdb I get only a short backtrace, possibly
> because debug info is missing from some critical libs:
>
>
> #0 0x0000003c9ee0f6ab in raise () from /lib64/libpthread.so.0
> #1 <signal handler called>
> #2 0x00007f4122578e3f in __intel_ssse3_rep_memcpy () from
> /usr/lib/oracle/12.1/client64/lib/libclntsh.so.12.1
> #3 0x00007f4122571cc6 in _intel_fast_memcpy.P () from
> /usr/lib/oracle/12.1/client64/lib/libclntsh.so.12.1
> #4 0x00007f4121b113f6 in nsc2addr () from /usr/lib/oracle/12.1/client64/
> lib/libclntsh.so.12.1
> #5 0x0000000000000000 in ?? ()
>
>
>
> Any suggestions on what I should do to fix this?
>
>
>
> --
> Fred Yankowski
> [email protected] +1-630-907-5019
>
>
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>

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