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Subject: Nonfunctional ethernet (was Re: 2.6.21-rc7-mm1 +
	sysfs-oops-workaround.patch -- INFO: possible recursive locking detected)
From: "Antonino A. Daplas" <adaplas@gmail.com>
To: Tejun Heo <htejun@gmail.com>
Cc: Miles Lane <miles.lane@gmail.com>, Andrew Morton <akpm@osdl.org>,
       LKML <linux-kernel@vger.kernel.org>
In-Reply-To: <1177512528.4856.15.camel@daplas>
References: <a44ae5cd0704242215w1b474c52r7860f0d49bc64d6c@mail.gmail.com>
	 <462EE4B7.6000708@gmail.com>  <1177512528.4856.15.camel@daplas>
Content-Type: text/plain
Date: Thu, 26 Apr 2007 07:45:02 +0800
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On Wed, 2007-04-25 at 22:48 +0800, Antonino A. Daplas wrote:
> On Wed, 2007-04-25 at 14:18 +0900, Tejun Heo wrote:
> > Miles Lane wrote:

> eth0 renamed to eth54
> BUG: atomic counter underflow at:
>  [<c0104378>] show_trace_log_lvl+0x1a/0x30
>  [<c0104ec9>] show_trace+0x12/0x14
>  [<c0104f22>] dump_stack+0x16/0x18
>  [<c01bd575>] _atomic_dec_and_lock+0x29/0x4c
>  [<c0174388>] dput+0x34/0x103
>  [<c019d181>] sysfs_drop_dentry+0x141/0x149
>  [<c019d212>] sysfs_hash_and_remove+0x89/0x10e
>  [<c019f1fc>] sysfs_remove_link+0xe/0x10
>  [<c0221839>] device_rename+0x110/0x181
>  [<c025420a>] dev_change_name+0x11e/0x1ca
>  [<c02545e6>] dev_ifsioc+0x330/0x3d7
>  [<c0254d25>] dev_ioctl+0x350/0x46e
>  [<c0249792>] sock_ioctl+0x1be/0x1ca
>  [<c016f3c0>] do_ioctl+0x1c/0x53
>  [<c016f5e3>] vfs_ioctl+0x1ec/0x203
>  [<c016f643>] sys_ioctl+0x49/0x62
>  [<c0103cde>] sysenter_past_esp+0x5f/0x99
>  =======================

The above tracing was caused by CONFIG_SYSFS_DEPRECATED=y and by setting
this to n, the tracing disappeared..  Still, all my network cards are
non-functional.  Entries in /sys/class/net are bogus:

/ # cd /sys/class/net/
/sys/class/net # ls
eth1  eth44  eth54  lo

/sys/class/net # cd eth1
-bash: cd: eth1: No such file or directory

/sys/class/net # ls -l eth1
lrwxrwxrwx 1 root root 0 Apr 26 07:15 eth1 ->
../../devices/pci0000:00/0000:00:12.0/net/eth0

/sys/class/net # cd ../../devices/pci0000\:00/0000\:00\:12.0/net/eth0
-bash: cd: ../../devices/pci0000:00/0000:00:12.0/net/eth0: No such file
or directory

Do you know of any patches I need to revert/apply?  Anyway, I have to
boot back to this kernel and find out more what's going on.

Tony