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Retained memory for a corrupted deferred kernel dump cannot be cleared (Doc ID 2472724.1)

Last updated on MARCH 09, 2021

Applies to:

Solaris Operating System - Version 11.3 to 11.3 [Release 11.0]
Oracle Solaris on x86-64 (64-bit)
Oracle Solaris on SPARC (64-bit)

Symptoms

A system running Solaris 11.3 exhibits a low memory condition.

A previous crash dump image is preserved in memory

The ::memstat output as shown in explorer/disks/zfs/mdb/mdb-memstat.out or as captured by this command:

root# echo ::memstat -v | mdb -k

would look similar to this:

Page Summary Pages Bytes %Tot
---------------------------- ---------------- ---------------- ----
Kernel 2089181 15.9G 3%
Retained 57909588 441.8G 86%    NOTE: This memory is unavailable to user/DB processes
Defdump 1903280 14.5G 3%
ZFS 894678 6.8G 1%
Anon 2332577 17.7G 3%
Exec and libs 121589 949.9M 0%
Page cache 41009 320.3M 0%
OSM 80896 632M 0%
Free (cachelist) 183042 1.3G 0%
Free (freelist) 1421952 10.8G 2%
Total 66977792 511G

The /var/adm/messages file might contain something like this:

savecore: [ID 702911 daemon.error] bad magic 80bf0000

That is an indication that a deferred kernel dump residing in memory is corrupt from savecore's point of view and as such savecore cannot process that dump.

 

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution

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