FIX: A Backup Log with the NO_TRUNCATE Option May Cause an Access Violation (319693)

SYMPTOMS

For a suspect database, you can back up the current transaction log by using the Transact-SQL NO_TRUNCATE option.

When you try to do so, if the database is suspect because the secondary data file is not available, the query may fail with the following messages in SQL Query Analyzer: The following stack dump is written to the SQL Server 7.0 RTM error log file:

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   Short Stack Dump
   0x41091082 Module(ums+1082) (UmsListBase::InsertTail+19) 
   0x410913aa Module(ums+13aa) (UmsList<UmsTimerRequest,0>::InsertTail+1c)     
   0x41091379 Module(ums+1379) (UmsQueue<UmsUserContext,0>::EnqueueTail+13)    
   0x410915e8 Module(ums+15e8) (UmsEvent::Wait+4c)                            
   0x0057c28b Module(sqlservr+17c28b) (FCBIoRequestDispenser::GetIoreq+4c)     
   0x00409bd3 Module(sqlservr+9bd3) (FCB::AsyncRead+13)                        
   0x00409eea Module(sqlservr+9eea) (DBTABLE::ScatterRead+65)                  
   0x00409e73 Module(sqlservr+9e73) (bufgetfromdisk+1c3)                       
   0x00402954 Module(sqlservr+2954) (bufget+13c)                               
   0x00405229 Module(sqlservr+5229) (getpage2+68)                              
   0x00404e8f Module(sqlservr+4e8f) (srchindex+131)                            
   0x00407392 Module(sqlservr+7392) (prepscan+ce)                              
   0x00407230 Module(sqlservr+7230) (LinkedPageSupplier::FirstPage+1d)         
   0x0040700c Module(sqlservr+700c) (LinkedPageSupplier::GetNextPage+41f)      
   0x00406e90 Module(sqlservr+6e90) (SDES::GetBiDi+1c2)                        
   0x004102b7 Module(sqlservr+102b7) (createdes+28c)                           
   0x00402cdb Module(sqlservr+2cdb) (opentabid+1b2)                            
   0x00406052 Module(sqlservr+6052) (CSysScan::OpenScan+b4)                    
   0x00405da8 Module(sqlservr+5da8) (CSysScan::StartScan+93)                   
   0x004c43eb Module(sqlservr+c43eb) (CFileGroupScan::FStartScanAll+20)        
   0x0071b9a6 Module(sqlservr+31b9a6) (BackupOperation::LoadFileGroupList+36)  
   0x006f64cd Module(sqlservr+2f64cd) (BackupOperation::SnapshotMetadata+1d8)  
   0x006fe313 Module(sqlservr+2fe313) (BackupEntry::BackupLog+3ec)            
   0x005e0821 Module(sqlservr+1e0821) (CStmtDumpXact::XretExecute+5b)         
   0x00419efa Module(sqlservr+19efa) (CMsqlExecContext::ExecuteStmts+118)     
   0x00419a0f Module(sqlservr+19a0f) (CMsqlExecContext::Execute+16b)          
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