IDS 12.10.FC12W1 Memory block header corruption
Mark Scranton reported growing shared memory block header corruption on IDS 12.10.FC12W1 on AIX 7.1, sometimes leaving an unrepairable pool and needing a restart. Art Kagel asked whether clients used shared memory; they were all TCP. SangGyu Jeong pointed to similar defect IT30342 and suggested contacting IBM. Unresolved.
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We are having more and more issues around shmem block header corruption with IDS 12.10.FC12W1. Sometimes the bad pool gets repaired, sometimes not. If not, the engine will eventually stop accepting new connections, so we bounce the hard way of course. Anyone else experiencing similar? I've created more PMRs (TS) in the last 6 months than in the last few years once we moved to IDS 12.10. Platform is AIX 7.1. Below is a snippet: 01/23/20 07:02:58 Memory block header corruption detected in mt_shm_malloc_segid 9 01/23/20 07:03:02 Found during mt_shm_free 1, error seen 1 times since last print to the log 01/23/20 07:03:02 Pool '8350181' (0x7000002aa2b6040) 01/23/20 07:03:02 Bad block header 0x7000002f106b860 01/23/20 07:03:02 Assert Failed: Memory block header corruption detected in mt_shm_free 1 01/23/20 07:03:02 IBM Informix Dynamic Server Version 12.10.FC12W1 01/23/20 07:03:02 Who: Session(8350181, <user redacted> 62586972, 70000023904f108) Thread(19565549, sqlexec, 7000001a2226b58, 93) File: mtshpool.c Line: 2763 01/23/20 07:03:02 Results: Unable to repair pool Thanks! Mark Scranton mark@markscranton.com ------------------------------ Mark Scranton ------------------------------ #Informix
Are clients shared memory or networked? Art Art S. Kagel, President and Principal Consultant ASK Database Management www.askdbmgt.com Blog: http://informix-myview.blogspot.com/ Disclaimer: Please keep in mind that my own opinions are my own opinions and do not reflect on the IIUG, nor any other organization with which I am associated either explicitly, implicitly, or by inference. Neither do those opinions reflect those of other individuals affiliated with any entity with which I am affiliated nor those of the entities themselves.
All TCP. Not the shmem limit you might be thinking of ... ------------------------------ Mark Scranton ------------------------------
Wasn't thinking of limits, just that any share memory connected app running as "informix" is capable of corrupting shared memory! But since it's network, not that. Art Art S. Kagel, President and Principal Consultant ASK Database Management www.askdbmgt.com Blog: http://informix-myview.blogspot.com/ Disclaimer: Please keep in mind that my own opinions are my own opinions and do not reflect on the IIUG, nor any other organization with which I am associated either explicitly, implicitly, or by inference. Neither do those opinions reflect those of other individuals affiliated with any entity with which I am affiliated nor those of the entities themselves.
Hello Mark, It would be more accurate to look at the stack trace together, but it seems that IT30342 is a similar error in 12.10.FC12W1 and above. https://www-01.ibm.com/support/docview.wss?uid=swg1IT30342 I have not seen this case in my customers yet. IBM can determine the exact cause of the error, but have you already contacted IBM? ------------------------------ SangGyu Jeong Software Engineer Infrasoft Seoul Korea, Republic of ------------------------------