Re: [Bug 50181] New: Memory usage doubles after more then 20 hours of uptime.

[Andrew Morton <akpm@linux-foundation.org>]

(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Tue,  6 Nov 2012 15:11:48 +0000 (UTC)
bugzilla-daemon@bugzilla.kernel.org wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=50181
> 
>            Summary: Memory usage doubles after more then 20 hours of
>                     uptime.
>            Product: Memory Management
>            Version: 2.5
>     Kernel Version: 3.7-rc3 and 3.7-rc4
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Other
>         AssignedTo: akpm@linux-foundation.org
>         ReportedBy: sukijaki@gmail.com
>         Regression: Yes
> 
> 
> Created an attachment (id=85721)
>  --> (https://bugzilla.kernel.org/attachment.cgi?id=85721)
> kernel config file
> 
> After 20 hours of uptime, memory usage starts going up. Normal usage for my
> system was around 2.5GB max with all my apps and services up and running. But
> with 3.7-rc3 and now -rc4 kernel, after more then 20 hours of uptime, it starts
> to going up. With kernel before 3.7-rc3, my machine could be up for 10 days and
> not go beyond 2.6GB memory usage.
> 
> If I start some app that uses a lot of memory, when there is already 4 or even
> 6GB used already, insted of freeing the memory, it starts to swap it, and
> everything slows down with a lot of iowait. 
> 
> Here is "free -m" output after 24 hours of uptime:
> 
> free -m
>              total       used       free     shared    buffers     cached
> Mem:          7989       7563        426          0        146       2772
> -/+ buffers/cache:       4643       3345
> Swap:         1953        688       1264
> 
> 
> I know that it is ok for memory to be used this much for buffers and cache, but
> it is not normal not to relase it when it is needed.
> 
> In attachment is my kernel config file.
> 

Sounds like a memory leak.

Please get the machine into this state and then send us

- the contents of /proc/meminfo

- the contents of /proc/slabinfo

- the contents of /proc/vmstat

- as root:

	dmesg -c
	echo m > /proc/sysrq-trigger
	dmesg

thanks.

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