linux-kernel - Re: BUG: Bad page map in process udevd (anon

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Date:	Fri, 18 Feb 2011 09:41:25 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Octavian Purdila <opurdila@...acom.com>,
	David Miller <davem@...emloft.net>,
	Ingo Molnar <mingo@...e.hu>, Michal Hocko <mhocko@...e.cz>,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: BUG: Bad page map in process udevd (anon_vma: (null)) in
 2.6.38-rc4

So I confirm previous kernels had a bug too in rollback_registered()

The "single" list was left as is before exiting.

default_device_exit_batch() seems OK, because the rtnl_unlock() acted as
a barrier in this respect : devices were removed from dev_kill_list
before exiting default_device_exit_batch()

Following this mail, please find two patches.

One from Linus to address bug introduced in commit 443457242beb6
(net: factorize
sync-rcu call in unregister_netdevice_many) in 2.6.38-rc1

A second one to address old bugs, so that stable teams can fix previous
kernels (2.6.33 and up)
Offending commit was 9b5e383c11b08784 (net: Introduce
unregister_netdevice_many())

Of course this second patch is also needed for current linux-2.6

Thanks


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