linux-kernel - Re: 2.6.21-rc7-mm2 crash: Eeek! page_mapcount(page) went negative! (-1)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 2 May 2007 14:14:11 +0200
From:	"Kay Sievers" <kay.sievers@...y.org>
To:	"Greg KH" <gregkh@...e.de>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Tilman Schmidt" <tilman@...p.cc>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, "Nick Piggin" <nickpiggin@...oo.com.au>,
	"Hugh Dickins" <hugh@...itas.com>
Subject: Re: 2.6.21-rc7-mm2 crash: Eeek! page_mapcount(page) went negative! (-1)

On 5/2/07, Greg KH <gregkh@...e.de> wrote:
> On Wed, May 02, 2007 at 12:10:00AM -0700, Andrew Morton wrote:
> > On Wed, 02 May 2007 09:01:22 +0200 Tilman Schmidt <tilman@...p.cc> wrote:
> >
> > > Am 30.04.2007 21:46 schrieb Andrew Morton:
> > > > Not really - everything's tangled up.  A bisection search on the
> > > > 2.6.21-rc7-mm2 driver tree would be the best bet.
> > >
> > > And the winner is:
> > >
> > > gregkh-driver-driver-core-make-uevent-environment-available-in-uevent-file.patch
> > >
> > > Reverting only that from 2.6.21-rc7-mm2 gives me a working kernel
> > > again.
> >
> > cripes.
> >
> > +static ssize_t show_uevent(struct device *dev, struct device_attribute *attr,
> > +                          char *buf)
> > +{
> > +       struct kobject *top_kobj;
> > +       struct kset *kset;
> > +       char *envp[32];
> > +       char data[PAGE_SIZE];
> >
> > That won't work too well with 4k stacks.

Yeah, sorry.

> Wait, even though this isn't good, it shouldn't have been hit by anyone,
> that file used to not be readable, so I doubt userspace would have been
> trying to read it...
>
> Tilman, what version of HAL and udev do you have on your machine?
>
> Kay, did you get the 'read the uevent file' code already into udev
> and/or HAL?

Only udevtest uses this at the moment, but that is only used for debugging.
It's probably the brain-dead libsysfs, which opens and reads every
file in /sys, even when nobody is interested in the data.

Thanks,
Kay
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/