From: Andrew Morton <akpm@linux-foundation•org>
To: Patrick McHardy <kaber@trash•net>
Cc: netdev@vger•kernel.org, bugme-daemon@bugzilla•kernel.org,
devzero@web•de, Robert Olsson <robert.olsson@its•uu.se>,
"Denis V. Lunev" <den@openvz•org>
Subject: Re: [Bugme-new] [Bug 10737] New: pktgen procfs problem
Date: Sat, 17 May 2008 21:56:41 -0700 [thread overview]
Message-ID: <20080517215641.acb94677.akpm@linux-foundation.org> (raw)
In-Reply-To: <482F88DE.8090508@trash.net>
On Sun, 18 May 2008 03:39:42 +0200 Patrick McHardy <kaber@trash•net> wrote:
> Andrew Morton wrote:
> > (switched to email. Please respond via emailed reply-to-all, not via the
> > bugzilla web interface).
> >
> > On Sat, 17 May 2008 13:59:25 -0700 (PDT) bugme-daemon@bugzilla•kernel.org wrote:
> >
> >
> >> http://bugzilla.kernel.org/show_bug.cgi?id=10737
> >>
> >> Summary: pktgen procfs problem
> >> Product: Networking
> >> Version: 2.5
> >> KernelVersion: 2.6.26-rc2
> >> Platform: All
> >> OS/Version: Linux
> >> Tree: Mainline
> >> Status: NEW
> >> Severity: normal
> >> Priority: P1
> >> Component: Other
> >> AssignedTo: acme@ghostprotocols•net
> >> ReportedBy: devzero@web•de
> >>
> >>
> >> Latest working kernel version: n/a
> >> Earliest failing kernel version: 2.6.26-rc2
> >> Distribution: suse 10.1
> >> Hardware Environment: p4 + gigabyte i915g MoBo
> >> Software Environment:
> >> Problem Description:
> >> pktgen module ocaasional seems to leak procfs entry
> >>
> >> May 18 00:00:34 test kernel: [ 2663.373955] pktgen v2.69: Packet Generator for
> >> packet performance testing.
> >> May 18 00:00:34 test kernel: [ 2663.384819] remove_proc_entry: removing
> >> non-empty directory 'net/pktgen', leaking at least 'kpktgend_1'
> >>
> >
> > ^^
> >
> > Possibly we were always leaking this procfs entry, and newly-added
> > procfs diagnostics are now detecting it.
> >
>
> I've been looking into the same problem, without much success so
> far. The problem appears to affect any /proc/net file, but not
> files outside of /proc/net, so I'm guessing its net-ns related.
> A testcase found by Ben Greear is opening the file multiple times:
>
> # /tmp/open /proc/net/kpktgen_0
>
> => refcnt goes to 1
>
> ^C
>
> => refcnt goes to 0
>
> Without ^C and opening the file a second time:
>
> # /tmp/open /proc/net/kpktgen_0
>
> => refcnt goes to 2 (sometimes also 11)
>
> ^C
>
> => refcnt stays at previous value.
>
> The refcnt even leaks if the file can't be successfully opened,
> for example because of lacking permissions.
urgh. Is any of this known to be post-2.6.25?
next prev parent reply other threads:[~2008-05-18 4:57 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-10737-10286@http.bugzilla.kernel.org/>
2008-05-17 21:10 ` [Bugme-new] [Bug 10737] New: pktgen procfs problem Andrew Morton
2008-05-18 1:39 ` Patrick McHardy
2008-05-18 4:56 ` Andrew Morton [this message]
2008-05-18 12:06 ` Patrick McHardy
2008-05-18 13:24 ` Patrick McHardy
2008-05-18 15:31 ` Patrick McHardy
2008-05-19 7:54 ` Denis V. Lunev
2008-05-19 10:34 ` Patrick McHardy
2008-05-20 0:26 ` Ben Greear
2008-05-20 1:14 ` Eric W. Biederman
2008-05-20 8:25 ` Robert Olsson
2008-05-19 21:34 ` Eric W. Biederman
2008-05-19 22:19 ` Ben Greear
2008-05-19 15:19 Alexey Dobriyan
-- strict thread matches above, loose matches on Subject: below --
2008-05-19 16:03 Alexey Dobriyan
2008-05-19 22:21 Alexey Dobriyan
2008-05-19 22:45 ` Robert Olsson
2008-05-20 21:57 Alexey Dobriyan
2008-05-20 21:17 ` Robert Olsson
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