linux-kernel - Re: 2.6.39-rc4+: Kernel leaking memory during FS scanning, regression?

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Date:	Mon, 25 Apr 2011 11:42:25 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
Cc:	kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Subject: Re: 2.6.39-rc4+: Kernel leaking memory during FS scanning, regression?

> On Sun, 24 April 2011 Bruno Prémont <bonbons@...ux-vserver.org> wrote:
> > On an older system I've been running Gentoo's revdep-rebuild to check
> > for system linking/*.la consistency and after doing most of the work the
> > system starved more or less, just complaining about stuck tasks now and
> > then.
> > Memory usage graph as seen from userspace showed sudden quick increase of
> > memory usage though only a very few MB were swapped out (c.f. attached RRD
> > graph).
> 
> Seems I've hit it once again (though detected before system was fully
> stalled by trying to reclaim memory without success).
> 
> This time it was during simple compiling...
> Gathered info below:
> 
> /proc/meminfo:
> MemTotal:         480660 kB
> MemFree:           64948 kB
> Buffers:           10304 kB
> Cached:             6924 kB
> SwapCached:         4220 kB
> Active:            11100 kB
> Inactive:          15732 kB
> Active(anon):       4732 kB
> Inactive(anon):     4876 kB
> Active(file):       6368 kB
> Inactive(file):    10856 kB
> Unevictable:          32 kB
> Mlocked:              32 kB
> SwapTotal:        524284 kB
> SwapFree:         456432 kB
> Dirty:                80 kB
> Writeback:             0 kB
> AnonPages:          6268 kB
> Mapped:             2604 kB
> Shmem:                 4 kB
> Slab:             250632 kB
> SReclaimable:      51144 kB
> SUnreclaim:       199488 kB   <--- look big as well...
> KernelStack:      131032 kB   <--- what???

KernelStack is used 8K bytes per thread. then, your system should have
16000 threads. but your ps only showed about 80 processes.
Hmm... stack leak?


> PageTables:          920 kB
> NFS_Unstable:          0 kB
> Bounce:                0 kB
> WritebackTmp:          0 kB
> CommitLimit:      764612 kB
> Committed_AS:     132632 kB
> VmallocTotal:     548548 kB
> VmallocUsed:       18500 kB
> VmallocChunk:     525952 kB
> AnonHugePages:         0 kB
> DirectMap4k:       32704 kB
> DirectMap4M:      458752 kB
> 


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