netdev - Re: [PATCH]: Schedule correct qdisc in watchdog.

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Date:	Mon, 18 Aug 2008 15:45:29 +0300
From:	Denys Fedoryshchenko <denys@...p.net.lb>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH]: Schedule correct qdisc in watchdog.

Patch applied, got another warning.

[  413.646102]
[  413.646102] =========================
[  413.646102] [ BUG: held lock freed! ]
[  413.646102] -------------------------
[  413.646102] pppd/4105 is freeing memory f6fe6e00-f6fe6eff, with a lock 
still held there!
[  413.646102]  (&qdisc_rx_lock){-+..}, at: [<c026e3ab>] 
shutdown_scheduler_queue+0x1c/0x2e
[  413.646102] 3 locks held by pppd/4105:
[  413.646102]  #0:  (all_ppp_mutex){--..}, at: [<f8a671ae>] 
ppp_shutdown_interface+0x17/0xb0 [ppp_generic]
[  413.646102]  #1:  (rtnl_mutex){--..}, at: [<c026967a>] rtnl_lock+0xf/0x11
[  413.647102]  #2:  (&qdisc_rx_lock){-+..}, at: [<c026e3ab>] 
shutdown_scheduler_queue+0x1c/0x2e
[  413.647102]
[  413.647102] stack backtrace:
[  413.647102] Pid: 4105, comm: pppd Not tainted 
2.6.27-rc3-build-0031-12578-g96d2031-dirty #32
[  413.647102]  [<c02ba6f7>] ? printk+0xf/0x18
[  413.647102]  [<c013db8f>] debug_check_no_locks_freed+0xce/0xff
[  413.647102]  [<c01643ce>] kfree+0x78/0xc8
[  413.647102]  [<c026e38b>] ? qdisc_destroy+0x8c/0x90
[  413.647102]  [<c026e38b>] qdisc_destroy+0x8c/0x90
[  413.647102]  [<c026e3b2>] shutdown_scheduler_queue+0x23/0x2e
[  413.647102]  [<c026e3fa>] dev_shutdown+0x3d/0x59
[  413.647102]  [<c0262240>] rollback_registered+0x128/0x1b1
[  413.647102]  [<c02622fb>] unregister_netdevice+0x32/0x6e
[  413.647102]  [<c0262349>] unregister_netdev+0x12/0x1a
[  413.647102]  [<f8a671f3>] ppp_shutdown_interface+0x5c/0xb0 [ppp_generic]
[  413.647102]  [<f8a6742c>] ppp_release+0x2c/0x5a [ppp_generic]
[  413.647102]  [<c0167db8>] __fput+0x99/0x136
[  413.647102]  [<c0167e6c>] fput+0x17/0x19
[  413.647102]  [<c016593b>] filp_close+0x47/0x51
[  413.647102]  [<c01659b8>] sys_close+0x73/0xad
[  413.647102]  [<c0103861>] sysenter_do_call+0x12/0x35
[  413.647102]  =======================

On Monday 18 August 2008, Jarek Poplawski wrote:
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