Date: Tue, 20 Apr 2010 04:26:28 GMT From: Alexey Illarionov <littlesavage@orionet.ru> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/145865: kernel memory leak with disabled devd and hw.bus.devctl_disable=1 Message-ID: <201004200426.o3K4QSpt021807@www.freebsd.org> Resent-Message-ID: <201004200430.o3K4U55K049890@freefall.freebsd.org>
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>Number: 145865
>Category: kern
>Synopsis: kernel memory leak with disabled devd and hw.bus.devctl_disable=1
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Apr 20 04:30:05 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: Alexey Illarionov
>Release: 7.3-STABLE
>Organization:
>Environment:
7.3-STABLE FreeBSD 7.3-STABLE #1: Mon Apr 19 05:25:53 MSD 2010 i386
>Description:
The 7.3-STABLE kernel leaks memory when devd is disabled even when hw.bus.devctl_disable=1.
The same problem exists on recent 8 stable with hw.bus.devctl_queue=0 and hw.bus.devctl_disable=1
I have mpd5 server with about 400 online users. After about month of uptime there was a kernel panic:
panic: kmem_malloc(16384): kmem_map too small: 335544320 total allocated
vmstat points to high bus memory usage:
bus 4891890 191093K - 4907302 16,32,64,128,1024
>How-To-Repeat:
1. Turn off devd:
# /etc/rc.d/devd stop
# sysctl hw.bus.devctl_disable=1
2. Create some kernel events and watch for memory:
# vmstat -m | awk '$1=="bus"{print $1,$2,$3}'
bus 1053 50K
# for i in `jot - 1 50` ; do ifconfig gre$i create ; ifconfig gre$i destroy ; done
# vmstat -m | awk '$1=="bus"{print $1,$2,$3}'
bus 1153 57K
# for i in `jot - 1 50` ; do ifconfig gre$i create ; ifconfig gre$i destroy ; done
# vmstat -m | awk '$1=="bus"{print $1,$2,$3}'
bus 1254 63K
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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