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Message-ID: <a44ae5cd0609051219p5962b62ek8dd695d3f3c88fa4@mail.gmail.com>
Date: Tue, 5 Sep 2006 12:19:57 -0700
From: "Miles Lane" <miles.lane@gmail.com>
To: "Stefan Richter" <stefanr@s5r6.in-berlin.de>
Subject: Re: 2.6.18-rc5-mm1 + all hotfixes -- INFO: possible recursive locking detected
Cc: "Andrew Morton" <akpm@osdl.org>, linux1394-devel@lists.sourceforge.net,
       LKML <linux-kernel@vger.kernel.org>,
       "Herbert Xu" <herbert@gondor.apana.org.au>
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On 9/5/06, Stefan Richter <stefanr@s5r6.in-berlin.de> wrote:
> Miles Lane wrote:
> > On 9/5/06, Andrew Morton <akpm@osdl.org> wrote:
> >> On Tue, 5 Sep 2006 10:37:51 -0700
> >> "Miles Lane" <miles.lane@gmail.com> wrote:
> >>
> >>> ieee1394: Node changed: 0-01:1023 -> 0-00:1023
> >>> ieee1394: Node changed: 0-02:1023 -> 0-01:1023
> >>> ieee1394: Node suspended: ID:BUS[0-00:1023]  GUID[0080880002103eae]
> >>>
> >>> =============================================
> >>> [ INFO: possible recursive locking detected ]
> >>> 2.6.18-rc5-mm1 #2
> >>> ---------------------------------------------
> >>> knodemgrd_0/2321 is trying to acquire lock:
> >>>  (&s->rwsem){----}, at: [<f8958897>] nodemgr_probe_ne+0x311/0x38d [ieee1394]
> >>>
> >>> but task is already holding lock:
> >>>  (&s->rwsem){----}, at: [<f8959078>] nodemgr_host_thread+0x717/0x883 [ieee1394]
>
> How often does this happen?

It seems to happen each time I plug in my JVC MiniDV camera (model GR-DVL9800U).

> >> That's a 1394 glitch, possibly introduced by git-ieee1394.patch.
> >
> > Would you like me to verify that removing the patch fixes it, or
> > should I wait for the 2.6.18-rc6-mm1 tree?
>
> My patches
> "ieee1394: nodemgr: switch to kthread api, replace reset semaphore" and
> "ieee1394: nodemgr: convert nodemgr_serialize semaphore to mutex"
> may be relevant. They are included in git-ieee1394.patch.
>
> Could you revert them individually and test? It should be possible to
> just "patch -p1 -R < ...." the following patchfiles:
> http://me.in-berlin.de/~s5r6/linux1394/updates/2.6.18-rc5/patches/119-ieee1394-nodemgr-convert-nodemgr_serialize-semaphore-to-mutex.patch
> If the problem persists, also revert
> http://me.in-berlin.de/~s5r6/linux1394/updates/2.6.18-rc5/patches/118-ieee1394-nodemgr-switch-to-kthread-api--replace-reset-semaphore.patch
>
> If that does not help, install them again and unapply all ieee1394
> patches from -mm. If you have the time.

I am setting up to test with the first patch removed.  The patch
doesn't apply cleanly, but I suspect this is no big deal.

patch -p1 -R < /home/miles/119-ieee1394-nodemgr-convert-nodemgr_serialize-semaphore-to-mutex.patch
patching file drivers/ieee1394/nodemgr.c
Hunk #2 succeeded at 1630 (offset 9 lines).
Hunk #3 succeeded at 1659 (offset 9 lines).
Hunk #4 succeeded at 1677 (offset 9 lines).
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