linux-kernel - Re: kmemleak false positive?

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Message-ID: <20090625193145.GA2600@redhat.com>
Date:	Thu, 25 Jun 2009 15:31:45 -0400
From:	Dave Jones <davej@...hat.com>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: kmemleak false positive?

On Thu, Jun 25, 2009 at 06:00:02PM +0100, Catalin Marinas wrote:
 > On Thu, 2009-06-25 at 11:40 -0400, Dave Jones wrote:
 > > Here's another case (with stack scanning on btw) which looks odd..
 > > 
 > >  kmemleak: unreferenced object 0xd86ba000 (size 16):
 > >  kmemleak:   comm "init", pid 1, jiffies 4294683556
 > >  kmemleak:   backtrace:
 > >  kmemleak:     [<c04fd8b3>] kmemleak_alloc+0x193/0x2b8
 > >  kmemleak:     [<c04f5e73>] kmem_cache_alloc+0x11e/0x174
 > >  kmemleak:     [<c05cdfdc>] avtab_insertf+0xd6/0x140
 > >  kmemleak:     [<c05ce3d7>] avtab_read_item+0x26a/0x284
 > >  kmemleak:     [<c05ce5a5>] avtab_read+0x82/0xe5
 > >  kmemleak:     [<c05d0618>] policydb_read+0x40c/0x1028
 > >  kmemleak:     [<c05d459d>] security_load_policy+0x57/0x37c
 > >  kmemleak:     [<c05c9995>] sel_write_load+0xb2/0x54a
 > >  kmemleak:     [<c0500186>] vfs_write+0x9f/0x10f
 > >  kmemleak:     [<c05002e1>] sys_write+0x58/0x8d
 > >  kmemleak:     [<c040a8eb>] sysenter_do_call+0x12/0x38
 > >  kmemleak:     [<ffffffff>] 0xffffffff
 > > 
 > > I looked over the SELinux code, and couldn't see an obvious leak.
 > > Eric Paris came to the same conclusion.
 > 
 > How long does a memory scanning take (i.e. time cat debug/kmemleak) on
 > your platform? Another tweak is to increase MSECS_MIN_AGE to something
 > like 1 minute or more. Especially on SMP, some newly allocated objects
 > may be in registers and reported as leaks.
 
0.00user 16.15system 0:33.38elapsed 48%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+158minor)pagefaults 0swaps

This is a VIA C3 with 512MB of RAM.

	Dave
 
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