FreeTDS Development Group

[Frediano Ziglio <freddy77 AT gmail.com>]

Yes, definitely a feature in git but not on 0.91

Frediano

2013/10/26 Frediano Ziglio <freddy77 AT gmail.com>:
> Could be a race condition related to thread support. Surely development 
> version has free thread support for odbc, not sure this feature was 
> supported on 0.91. UnixOdbc make our library safer even without, not iOdbc. 
> I'll check it
>
> Frediano Ziglio
>
> Il giorno 25/ott/2013, alle ore 12:53, Edwin Boatswain 
> <eboatswain AT itrsgroup.com> ha scritto:
>
>> Hello,
>>
>> I’m hoping someone has seen or can provide some insight into the 
>> following.  We have an issue where one of our customers is interfacing to 
>> an MS SQL Server database from a Linux Virtual Machine.  To accomplish 
>> this we’re using FreeTDS 0.91 and iODBC 3.52.8.  On our reproduction of 
>> their environment, replaying the customer’s own data, this works fine.  
>> The customer however is seeing intermittent crashes with a stack trace 
>> that looks like this:
>>
>> Program terminated with signal 11, Segmentation fault.
>> #0  tds_free_results (res_info=0x6f726300) at mem.c:528
>> 528     mem.c: No such file or directory.
>>         in mem.c
>> (gdb) where
>> #0  tds_free_results (res_info=0x6f726300) at mem.c:528
>> #1  0xf4e12def in tds_free_param_results (param_info=0x6f726300) at 
>> mem.c:479
>> #2  0xf4e12604 in tds_free_input_params (dyn=0x93e8898) at mem.c:132
>> #3  0xf4e07dc7 in _SQLExecute (stmt=0x9f61520) at odbc.c:3074
>> #4  0xf4e0809c in SQLExecute (hstmt=0x9f61520) at odbc.c:3256
>> #5  0xf4e5b456 in SQLExecute_Internal (hstmt=0x9f61458) at execute.c:373
>> #6  0xf4e5b6cd in SQLExecute (hstmt=0x9f61458) at execute.c:459
>> #7  0x08b64370 in IodbcCursor::Execute (this=0xa09e460, 
>> nPlaceHolderCount=2,
>>     ppPlaceHolders=0x9c3f5f0) at odbcClient.cpp:1718
>> #8  0x08b4a713 in SACommand::Execute (this=0xa09e408) at SQLAPI.cpp:3889
>> #9  0x08b2da7c in DBConnection::wexecutePrepared (this=0x9f3e0ec)
>>     at ../../src/DBConnection.cpp:1142
>> #10 0x08b369b0 in DBConnection::run (this=0x9f3e0ec)
>>     at ../../src/DBConnection.cpp:1792
>> #11 0x08b37c47 in DBConnectionBlockingRun (arg=0x9f3e0ec)
>>     at ../../src/DBConnection.cpp:1839
>> #12 0xf71dd879 in start_thread () from /lib/libpthread.so.0
>> #13 0xf6f9cffe in clone () from /lib/libc.so.6
>> Backtrace stopped: Not enough registers or memory available to unwind 
>> further
>>
>> I was wondering if there any known issues in this area or perhaps someone 
>> has seen this before?
>>
>> Regards,
>> Edwin Boatswain
>>
>> --
>> Edwin Boatswain ● Software Developer ● ITRS Group Ltd
>>
>>
>>
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