Memory corruption regression with kernel 3.0.101-0.35 and using pagecache limit
This document (7015898) is provided subject to the disclaimer at the end of this document.
Environment
SUSE Linux Enterprise Server for SAP Applications
Situation
After
updating to kernel 3.0.101-0.35 systems are susceptible to crashes if
Pagecache limit is set. Corruption of memory pointers happens during file cache reclaim resulting in null pointers and other exceptions. Limiting the page cache ensures that the reclaim process will be run often and thus ensures the system will crash. Stack traces vary so are not referenced.
The system _will_ crash if the following conditions are met.
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- kernel version is 3.0.101-0.35 - pagecache limit is set (vm.pagecache_limit_mb)
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Note that limiting the kernel pagecache is only supported on SLES for SAP.
PRE.cjk { font-family: "Droid Sans Fallback",monospace; }P { margin-bottom: 0.08in; }A:link { }Example of checking to see if the pagecache limit is set (a non-zero value means it is).
myhost:~ # sysctl -a | grep vm.pagecache_limit_mb vm.pagecache_limit_mb = 4096
Resolution
Update to kernel 3.0.101-0.40 to resolve the issue available here.
Disclaimer
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- Document ID:7015898
- Creation Date: 17-Nov-2014
- Modified Date:28-Sep-2022
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- SUSE Linux Enterprise Server
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