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

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Date:	Wed, 2 May 2007 00:10:00 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Tilman Schmidt <tilman@...p.cc>, Kay Sievers <kay.sievers@...y.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Hugh Dickins <hugh@...itas.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: 2.6.21-rc7-mm2 crash: Eeek! page_mapcount(page) went negative!
 (-1)

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.

Who's reviewing this stuff?  The patch headers indicate that no mailing list was
cc'ed?
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