On Tue, Jun 17, 2008 at 5:20 PM, Michael Buesch <[EMAIL PROTECTED]> wrote:
> On Tuesday 17 June 2008 22:59:52 David Ellingsworth wrote:
>> I ran into this error today from a kernel I built last night based on
>> the latest wireless-testing branch. Correct me if I'm wrong, but it
>> looks to be b43legacy related. I'm a bit new to kernel debugging but
>> can try to provide additional information if instructions on how to do
>> so are provided.
>
> No, this is a mac80211 bug
>
>> --------------------------------------------------------------------------------------
>> dmesg output:
>> --------------------------------------------------------------------------------------
>> WARNING: at kernel/softirq.c:141 local_bh_enable+0x1f/0x59()
>> Modules linked in: ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4
>> nf_conntrack ip_tables x_tables radeon drm binfmt_misc ppdev lp
>> dm_snapshot dm_mirror dm_log dm_mod b43legacy mac80211 cfg80211
>> led_class snd_ali5451 snd_ac97_codec ac97_bus snd_pcm_oss
>> snd_mixer_oss ati_agp ibmcam usbvideo ssb pcmcia snd_pcm snd_timer
>> evdev videodev v4l1_compat container battery ac button firmware_class
>> agpgart i2c_ali1535 snd video output parport_pc parport yenta_socket
>> rsrc_nonstatic pcmcia_core psmouse serio_raw i2c_ali15x3 i2c_core
>> soundcore snd_page_alloc pcspkr reiserfs ide_cd_mod cdrom ide_disk
>> alim15x3 natsemi ide_pci_generic ide_core ohci_hcd usbcore thermal
>> processor fan
>> Pid: 1371, comm: b43legacy Not tainted 2.6.26-rc6-wl #1
>> [<c0113be7>] warn_on_slowpath+0x40/0x66
>> [<c0111c60>] check_preempt_wakeup+0xa2/0xc0
>> [<c0120d0d>] autoremove_wake_function+0xc/0x2b
>> [<c010fc44>] __wake_up_common+0x2d/0x52
>> [<c011126e>] __wake_up+0xf/0x15
>> [<c0113f89>] wake_up_klogd+0x2b/0x2d
>> [<c01981ed>] scnprintf+0x1f/0x2b
>> [<c0117477>] local_bh_enable+0x1f/0x59
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> This function does not like being run with IRQs disabled.
> WARN_ON_ONCE(irqs_disabled());
>
>> [<dcf44045>] __sta_info_unlink+0xa9/0x134 [mac80211]
>> [<dcf4453f>] sta_info_unlink+0x9/0xd [mac80211]
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> This function disables interrupts
>
>> [<dcf48968>] ieee80211_associated+0x9f/0x148 [mac80211]
>> [<dcf4b463>] ieee80211_sta_work+0x4cb/0x64f [mac80211]
>> [<c0110392>] update_curr+0x3d/0x52
>> [<c01104ee>] dequeue_entity+0xf/0x8d
>> [<c0111979>] dequeue_task_fair+0x13/0x27
>> [<c010fab2>] dequeue_task+0xa/0x14
>> [<c0249b01>] schedule+0x22e/0x24a
>> [<dcf4af98>] ieee80211_sta_work+0x0/0x64f [mac80211]
>> [<c011e7a7>] run_workqueue+0x63/0xca
>> [<c011ec96>] worker_thread+0x0/0xb7
>> [<c011ed42>] worker_thread+0xac/0xb7
>> [<c0120d01>] autoremove_wake_function+0x0/0x2b
>> [<c011ec96>] worker_thread+0x0/0xb7
>> [<c0120ba6>] kthread+0x36/0x5c
>> [<c0120b70>] kthread+0x0/0x5c
>> [<c010390b>] kernel_thread_helper+0x7/0x10
>
>
> I'm not sure _why_ local_bh_enable() doesn't like getting called
> with interrupts disabled.
> The code is a bit weird:
>
> 134 void local_bh_enable(void)
> 135 {
> 136 #ifdef CONFIG_TRACE_IRQFLAGS
> 137 unsigned long flags;
> 138
> 139 WARN_ON_ONCE(in_irq());
> 140 #endif
> 141 WARN_ON_ONCE(irqs_disabled());
> 142
> 143 #ifdef CONFIG_TRACE_IRQFLAGS
> 144 local_irq_save(flags);
> 145 #endif
> 146 /*
> 147 * Are softirqs going to be turned on now:
> 148 */
> 149 if (softirq_count() == SOFTIRQ_OFFSET)
> 150 trace_softirqs_on((unsigned
> long)__builtin_return_address(0));
> 151 /*
> 152 * Keep preemption disabled until we are done with
> 153 * softirq processing:
> 154 */
> 155 sub_preempt_count(SOFTIRQ_OFFSET - 1);
> 156
> 157 if (unlikely(!in_interrupt() && local_softirq_pending()))
> 158 do_softirq();
> 159
> 160 dec_preempt_count();
> 161 #ifdef CONFIG_TRACE_IRQFLAGS
> 162 local_irq_restore(flags);
> 163 #endif
> 164 preempt_check_resched();
> 165 }
> 166 EXPORT_SYMBOL(local_bh_enable);
>
>
>
> --
> Greetings Michael.
>
Thanks for clarifying. Is this something that might be caused by a
missing configuration option in my kernel?
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