3764437 - Canceling a complex query causes server crash after user cancellation - SAP IQ

Canceling a complex, long‑running query causes the server to crash and produce a stack trace.
A signal 11 is raised and reported in an "IQ abort" message (for example: caught signal 11 at stcxtlib/st_server.cxx:2490).

Stack trace examples reference components such

hs_btCache::~hs_btCache
s_subohcBTCursor<s_btfdiskblock,s_btfitem>::__Destruct
s_keyRangeWorkDesc::~s_keyRangeWorkDesc
s_keyRangeWorkDesc::__dftdt
unknown
s_keyRangeWorkAllocatorBase::~s_keyRangeWorkAllocatorBase
s_BTkeyRangeWorkAllocator::~s_BTkeyRangeWorkAllocator
s_ohcKeyRangeWorkAllocator::~s_ohcKeyRangeWorkAllocator
dfo_cOrderByParaIn::ShutdownSink
dfo::DestroyLastLeaf
dfo_Root::~dfo_Root
st_cursor::__Destruct
st_cursor::~st_cursor
st_cursorIQtoSA::~st_cursorIQtoSA
df_dmlcommand::~df_dmlcommand
df_OpenCursor::__dftdt
unknown
unknown
hos_attnexception::doThrow

• SAP IQ 16.1 

cancel query crash, server crash on cancel, signal 11, hos_attnexception, sqlcode -299, sqlstate 57014, stack trace, order by parallel, dfo root, hs_btcache, key range work allocator, cursor active, multiplex coordinator, aix, request logging , KBA , BC-SYB-IQ , Sybase IQ , Problem