2252135 - IQ Multiplex server hang, stack symbols : "s_bufpool::GetPageFrame" -- SAP IQ

Coordi server got hang after upgrading to ESD5.8 from ESD5.6. ( 07:53:26 ~ 08:29:17)
There are no suspicious clues in iqmsg and srvlog file before server falled to hang status.
The problem lasted more than half an hour. Finally DBA restarted server to resolve the problem.
Dump stack looks very similar with other case CR-791092, 780337.

* Customer stack : Thread 49873019 & 64815339
 
     .. ...
     .. pthread_cond_wait(??, ??) + 0x1a8
     .. hos_cond_wait(??, ??, ??) + 0xbc
     .. pthread_cond_wait(??, ??) + 0x1a8
     .. hos_condvar::Wait() const(??) + 0x4c
     .. s_bufpool::GetPageFrame(int,int,unsigned  ...
     .. s_bufpartition::GetCleanPage(s_bufman_errorInfo*,s_connectionCacheStats*, ...
     .. s_bufpartition::Create(s_bufman_errorInfo*,s_connectionCacheStats*, ...
     .. s_blockmap::CreateDontZero(short,int,hos_cmprstype,unsigned  ...
     .. s_scratchPage::CreateBuf()(??) + 0x78
     .. s_scratchPage::CreateBuf()(??) + 0x24
     .. v2s_bmcontext::bmlev1sgblkselfmv(int)(??, ??) + 0xb8
     .. v2s_bmcontext::bmsgselfappelt(unsigned ...
     .. v2s_bmcontext::bmselfcpytail1(int,unsigned long,int, ...
     .. v2s_bmcontext::bmselfsetrng(s_bm*,unsigned long, ...
     .. s_bm::SetBits(unsigned long,unsigned ...
     .. s_VersioningBlockmap::Allocate
     .. ...

SAP IQ 15.4

"s_bufpool::GetPageFrame"; "s_bufpartition::GetCleanPage" ; , KBA , BC-SYB-IQ , Sybase IQ , Problem