IQ server becomes unresponsive intermittently with following message in .srvlog/.stderr.
It can be seen with or without an IQ upgrade.
However, the issue is more likely to occur after upgrading from 16.1 SP02 PL17 to 16.1 SP04 PL03.
=> "Task 144a16870(Request task 467) is trying get forbid mutex held by task 14569a5b0(Request task 474) for more than 60000 ms"
According to customer, problem symptoms are like below,
- cpu usage is 0 % during the issue
- no connection is allowed during the issue
- persists symptom for about 1 ~ 2 minutes once the issue occurs
- lot's of jobs are canceled during the issue
Suspect stacks ,
---------- tid# ..... ----------
.. timestampnow(??) + 0x14
.. a_db_message::set_text( ...
.. a_db_message::a_db_message( ,..
.. DBMsgList::AddMessage ...
.. MessageDispatcher::Send( ..
.. ForbidMutexSet::get(unsigned int) ..
- SAP IQ16.1 SP04.03
- SAP HANA Dynamic Tiering 2.0 Rev 47
'get forbid mutex' , 'Cancellation request received' , 'ForbidMutexSet::get' , 'ForbidMutexSet' , , KBA , BC-SYB-IQ , Sybase IQ , Bug Filed
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