2840171 - IPHR error followed by a s_trycatch.cxx Non-Fatal stack at s_buf::DumpOnBufmanError and a s_blockmap.cxx at s_ROBlockmapCursor::Find - SAP IQ

• A simple SELECT query fails with a main Bufman: Incorrect page header read  IPHR error 
  
  
• This results in a Non-Fatal Error Detected at slib/s_trycatch.cxx:3094  and stack at these calls:
  s_buf::DumpOnBufmanError
  s_buf::ReadBufAndVerify
  s_buf::Read
  s_bufpartition::Find
  s_ROBlockmapCursor::Find
  s_bArrayCursor::Find
   
• This is followed by the following bufman errors and s_blockmap stack:
  There was an s_buf::Read() error during s_bufman::Find().
  Warning: s_blockmap is throwing while user locked.
  Informational stack trace from Diagnostic Stacktrace in s_blockmap::ThrowError for user locked blockmap
  at slib/s_blockmap.cxx:13322
  s_blockmap::ThrowError
  s_ROBlockmapCursor::Find
  s_bArrayCursor::Find
  s_bArrayLocater::LoadBlock
  s_bArrayLocater::LoadPage
  s_bArrayLocater::LocateTokenRecord
  hs_dpfetch::ColumnScan3_ByteArr
  vpp_FindIter::DoOneWorkunit
   
• Other errors seen include:
  Exception Thrown from slib/s_blockmap.cxx:15030
  ErrID: 2100 (s_corruptdiskblkhdrexception); SQLCode: -1009039, SQLState: 'QSA39', Severity: 14
  main Bufman: An error was detected on a database page. You may have a damaged index.
  
  

• This issue does not crash the SAP IQ server process.
• No data corruption has resulted from this error,  DBCC sp_iqcheckdb consistency checks reports no errors.
• Reported occurrences of this issue are very rare, and appear random.

• SAP IQ 16.1 SP03 PL06 

sybase, error, fail, CR820069, CR#820069, 820069, exception, bufferman, blockmap, sporadic, oneoff, one-off, damage, verify, checkdb, dbcc, corrupt, clean, upgrade, reproduce, CR821241, CR#821241, 821241, false, positive , KBA , BC-SYB-IQ , Sybase IQ , Bug Filed