linux-kernel - Re: mISDN: WARNING: at kernel/softirq.c:124 local_bh

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Message-Id: <20090604195948.9c7af254.akpm@linux-foundation.org>
Date:	Thu, 4 Jun 2009 19:59:48 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mathias Kretschmer <psoting@...4.net>
Cc:	linux-kernel@...r.kernel.org, isdn@...ux-pingi.de,
	netdev@...r.kernel.org
Subject: Re: mISDN: WARNING: at kernel/softirq.c:124
 local_bh_enable+0x8f/0xb0()

(cc's added)

On Fri, 5 Jun 2009 00:07:12 +0200 Mathias Kretschmer <psoting@...4.net> wrote:

> Hi *,
> 
> the following pops up from time to time when I place a call (might also 
> happened on incoming calls). 
> 
> machine is an AMD K8 dual core running a x86_64 2.6.29.4-grsec kernel.
> 
> please, let me know if you need more details.
> 
> cheers,
> 
> Mathias
> 
> [88563.318126] ------------[ cut here ]------------
> [88563.318129] WARNING: at kernel/softirq.c:124 local_bh_enable+0x8f/0xb0()
> [88563.318130] Hardware name: empty
> [88563.318132] Modules linked in: usbtouchscreen dvb_usb_cinergyT2 dummy 
> bonding snd_emu10k1 snd_rawmidi snd_ac97_codec ath9k ac97_bus snd_pcm 
> snd_page_alloc snd_util_mem forcedeth snd_hwdep
> [88563.318141] Pid: 826, comm: mISDN_hfc-pci.1 Not tainted 2.6.29.4-grsec #13
> [88563.318142] Call Trace:
> [88563.318147]  [<ffffffff8025909a>] warn_slowpath+0xea/0x160
> [88563.318149]  [<ffffffff8025ee0f>] local_bh_enable+0x8f/0xb0
> [88563.318152]  [<ffffffff8065f284>] sk_filter+0x44/0xa0
> [88563.318154]  [<ffffffff8064548d>] sock_queue_rcv_skb+0x5d/0x120
> [88563.318156]  [<ffffffff8060410f>] mISDN_send+0x4f/0xa0
> [88563.318159]  [<ffffffff8060790e>] l2up_create+0x7e/0x100
> [88563.318161]  [<ffffffff8060b6e0>] l2_got_tei+0x0/0x90
> [88563.318163]  [<ffffffff8060b722>] l2_got_tei+0x42/0x90
> [88563.318164]  [<ffffffff80602d32>] mISDN_FsmEvent+0x82/0x100
> [88563.318167]  [<ffffffff8060cb00>] tei_id_assign+0x0/0x120
> [88563.318168]  [<ffffffff80602d32>] mISDN_FsmEvent+0x82/0x100
> [88563.318170]  [<ffffffff8060e373>] mgr_send+0x4d3/0x660
> [88563.318172]  [<ffffffff8061ac8e>] hfcpci_l2l1D+0x19e/0x2f0
> [88563.318174]  [<ffffffff80606591>] mISDNStackd+0x431/0x680
> [88563.318177]  [<ffffffff80270950>] autoremove_wake_function+0x0/0x30
> [88563.318179]  [<ffffffff80606160>] mISDNStackd+0x0/0x680
> [88563.318181]  [<ffffffff80270547>] kthread+0x47/0x80
> [88563.318183]  [<ffffffff802226fa>] child_rip+0xa/0x20
> [88563.318185]  [<ffffffff80270500>] kthread+0x0/0x80
> [88563.318186]  [<ffffffff802226f0>] child_rip+0x0/0x20
> [88563.318188] ---[ end trace 2a7bb9b2f669de5a ]---
> 

hm, tricky, who disabled interrupts?  It could be

	spin_lock_irqsave(&hc->lock, flags);

in hfcpci_l2l1D().
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