linux-kernel - Re: WARNING: at lib/kref.c:33 kref

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Date:	Sat, 10 Nov 2007 19:27:37 -0500
From:	Erez Zadok <ezk@...sunysb.edu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Erez Zadok <ezk@...sunysb.edu>, linux-kernel@...r.kernel.org,
	Dave Hansen <haveblue@...ibm.com>, Greg KH <greg@...ah.com>
Subject: Re: WARNING: at lib/kref.c:33 kref_get() (-mm 2007-11-06-02-32++) 

In message <20071110145452.f6cf6326.akpm@...ux-foundation.org>, Andrew Morton writes:
> On Fri, 9 Nov 2007 21:12:47 -0500 Erez Zadok <ezk@...sunysb.edu> wrote:
> 
> > Setup: FC6 system with MM snapshot broken-out-2007-11-06-02-32
> 
> That's a bit old.
> 
> > and these two
> > patches added:
> > 
> > r-o-bind-mounts-track-number-of-mount-writer-fix-buggy-loop.patch
> > r-o-bind-mounts-track-number-of-mount-writer-fix-buggy-loop-checkpatch-fixes.patch
> > 
> > Booting the machine, waiting a few minutes (not logging in or doing anything
> > else).  I get:
> > 
> > WARNING: at lib/kref.c:33 kref_get()
> >  [<c020282a>] show_trace_log_lvl+0x12/0x25
> >  [<c0203024>] show_trace+0xd/0x10
> >  [<c0203120>] dump_stack+0x15/0x17
> >  [<c02c7f85>] kref_get+0x26/0x30
> >  [<c02c731b>] kobject_get+0x12/0x17
> >  [<c02c7770>] kobject_add+0x97/0x162
> >  [<c02164e5>] uids_user_create+0x41/0x5d
> >  [<c0216850>] alloc_uid+0xc9/0x171
> >  [<c0219b50>] set_user+0x1f/0x93
> >  [<c021b445>] sys_setuid+0x4b/0xcb
> >  [<c02021fe>] sysenter_past_esp+0x5f/0x91
> >  =======================
> > 
> > There's no other indication where the setuid(2) came from, perhaps cron?
> > 
> 
> I have a feeling that this was reported before and that Dave and/or Greg
> looked into it.  Were those two patches which Dave sent yesterday applied?

Yes, both of Dave's patches were applied.  I'll give the latest -mm a try
first and see report comes up.

> It might be worth checking my current tree:
> http://userweb.kernel.org/~akpm/mmotm/

The above URL is very useful.  Thanks!

I've got comments on my experience w/ the above URL, but I'll send those as
separate emails shortly.

Erez.
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