AccessViolationException periodically encountered in AseConnection.Close on a multi-threaded IIS application after connection to ASE times out.
Using the blocked remote i/o method to induce the timeout. That's where the middle tier calls a proc that does a select on a proxy table that has been locked on the remote server in exclusive mode.
Here's the sequence of events:
- Presentation tier to middle tier timeout is 3:15. Middle tier to db tier timeout is 3:00
0:00 middle tier calls proc that reads locked proxy table. DB spid is in remote i/o state, proxied to user account (as expected)
3:15 presentation tier records timeout message
6:02 driver returns error 30046 - "Connection to Sybase server has been lost. Connection died from command timeout. All active transactions have been rolled back." DB spid is still in remote i/o state, proxied to user account . It's interesting to note that error 30046 occurs at about 2x the database timeout. Other tests have shown the same timing.
11:00 lock on remote table is released. DB spid is in recv sleep state, still proxied to user account (expected, since set proxy to MT account could not be executed)
12:46 MT crashes. Message in ASE log: Cannot read, host process disconnected
<< windows application event log, >>
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.AccessViolationException
Faulting application name: Service.exe, version: 126.96.36.199, time stamp: 0x524d07f3
Faulting module name: unknown, version: 0.0.0.0, time stamp: 0x00000000
Exception code: 0xc0000005
Fault offset: 0x206e6f69
Faulting process id: 0x7d4
Faulting application start time: 0x01cebffdfb88d4a3
Faulting application path: Service.exe
Faulting module path: unknown
Report Id: e99cd51a-2c30-11e3-949c-8631cddad159
<< nothing recorded in system event log >
- In a previous test with timing similar to the above, the MT crashed with the message:
<< windows system event log >>
Application popup: Microsoft Visual C++ Runtime Library : Runtime Error!
- pure virtual function call
<< windows application event log >>
Faulting application name: Service.exe, version: 188.8.131.52, time stamp: 0x524bb681
Faulting module name: sybdrvado20.dll, version: 2.157.1101.0, time stamp: 0x52427071
Exception code: 0x40000015
Fault offset: 0x0006cb89
Faulting process id: 0x2f94
Faulting application start time: 0x01cebf3536dc2835
Faulting application path: WCFService.exe
Faulting module path: C:\Windows\TEMP\Sybase.AdoNet4.AseClient.32bits.4.157.1101.0\sybdrvado20.dll
Report Id: a1e0f285-2b61-11e3-b5ad-663a32047475
- SAP Sybase Software Developer Kit (SDK) 15.7 SP110
- Adaptive Server Enterprise ADO.NET Data Provider
- 4.0 Provider ( Sybase.AdoNet4.AseClient.dll )
- .net 4
KBA , BC-SYB-SDK , SDK , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Problem
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