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Memory exhaustion leading to system hang on Solaris 10u11 (or kernel 147147-26) with ZFS (Doc ID 1573006.1)

Last updated on JULY 24, 2018

Applies to:

Solaris Operating System - Version 10 1/13 U11 and later
Information in this document applies to any platform.

Symptoms

The system hangs due to memory exhaustion, the hang may be preceded by messages indicating there's a shortage of memory such as

  "error Couldn't fork: Resource temporarily unavailable"

Review of a forced system crash dump will likely show a large portion of the systems memory used by the kernel and threads stuck waiting on memory which may include threads with stacks such as this

 genunix:cv_wait+0x38()
 genunix:delay_common+0x80()
 genunix:delay+0x88()
 unix:page_resv+0x78()
 unix:segkmem_xalloc+0x74()
 unix:segkmem_alloc_vn+0xc0()
 genunix:vmem_xalloc+0x5c8()
 genunix:vmem_alloc+0x1d4()
 genunix:kmem_slab_create+0x44()
 genunix:kmem_slab_alloc+0x30()
 genunix:kmem_cache_alloc+0x2dc()
 ..

 

Changes

The issue can affect SPARC and x64 systems running Solaris 10u11 using ZFS. 

  SPARC systems with kernel patch 147147-26 or later and without ZFS patch 150125-03. 

  x64 systems with kernel patch 147148-26 or later and without ZFS patch 149637-04.

The issue may be triggered by a backup on small memory systems (2gb), on larger memory systems the trigger may be an IO load particularly one that sequentially accesses datasets with different recordsizes.

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution

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