Bug 457413 - box OOM's under heavy mmap usage.
box OOM's under heavy mmap usage.
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel (Show other bugs)
All Linux
high Severity high
: rc
: ---
Assigned To: Rik van Riel
CAI Qian
Depends On:
Blocks: 580953
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Reported: 2008-07-31 10:54 EDT by Josef Bacik
Modified: 2013-01-09 16:22 EST (History)
3 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2010-07-12 09:13:18 EDT
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RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Josef Bacik 2008-07-31 10:54:09 EDT
+++ This bug was initially created as a clone of Bug #457411 +++

While investigating a locking order bug that resulted in a hang (bz 439548) it
was discovered that when the locking bug was fixed and the testcase was able to
continue that it would cause an OOM kill.  This problem is reproduceable upstream.

The testcase is simple, untar it, edit the VAR file to point at a blank
partition/volume that it will use, and then do sh run.sh and it will start, at
some point you will see things getting killed.  I'm also attaching a txt file
with a sample of the OOM messages I got (on an upstream kernel).

-- Additional comment from jbacik@redhat.com on 2008-07-31 10:52 EST --
Created an attachment (id=313105)

-- Additional comment from jbacik@redhat.com on 2008-07-31 10:53 EST --
Created an attachment (id=313106)
oom messages
Comment 1 RHEL Product and Program Management 2009-06-15 17:02:45 EDT
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
Comment 3 Rik van Riel 2010-07-08 19:21:57 EDT
The test case (modified a little to run in my 1GB RAM virtual machine) has been running for the past 2 hours.  So far the VM seems unimpressed with the load :)

It helps that the mlocked pages are moved onto the unevictable list and the page cache and anonymous pages are both on their own lists.  Not having the 2/3 of memory that is mlocked getting in the way of the pageout scan really helps...
Comment 4 Rik van Riel 2010-07-08 23:14:04 EDT
After 7 hours of run time, the system is still doing fine.  I'll leave it running for several more days, but don't expect that RHEL 6 will need a fix for this issue.
Comment 5 Rik van Riel 2010-07-12 09:13:18 EDT
I guess I forgot to change the BZ status.  The bug appears to be fixed in RHEL 6 :)

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