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Date: Sat, 23 Oct 2004 14:45:01 +0100 (WEST)
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-U10.2
From: "Rui Nuno Capela" <rncbc@rncbc.org>
To: "Ingo Molnar" <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org, "Lee Revell" <rlrevell@joe-job.com>,
       mark_h_johnson@raytheon.com, "K.R. Foley" <kr@cybsft.com>,
       "Bill Huey" <bhuey@lnxw.com>, "Adam Heath" <doogie@debian.org>,
       "Florian Schmidt" <mista.tapas@gmx.net>,
       "Thomas Gleixner" <tglx@linutronix.de>,
       "Michal Schmidt" <xschmi00@stud.feec.vutbr.cz>,
       "Fernando Pablo Lopez-Lezcano" <nando@ccrma.stanford.edu>,
       "Alexander Batyrshin" <abatyrshin@ru.mvista.com>
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Ingo Molnar wrote:
>
> Rui Nuno Capela wrote:
>
>> > does the patch below help?
>
>> Nope. Same result:
>
>> SysRq : <3>BUG: sleeping function called from invalid context IRQ 1(776)
>> at kernel/mutex.c:37
>> in_atomic():0 [00000000], irqs_disabled():1
>
> interrupts are disabled. You used a -RT-U10.2/3 kernel, and have
> CONFIG_REALTIME enabled, right? Do you have this in
> drivers/net/netconsole.c, line 77:
>
>  #ifdef PREEMPT_REALTIME
>          /*
>           * A bit hairy. Netconsole uses mutexes (indirectly) and
>           * thus must have interrupts enabled:
>           */
>          local_irq_enable();
>  #endif
>
> correct? Could you do this a few lines below:
>
>                 WARN_ON_RT(irqs_disabled());
>                 netpoll_send_udp(&np, msg, frag);
>                 WARN_ON_RT(irqs_disabled());
>
> to figure out who disables interrupts. Also, could you add the same two
> lines to net/core/netpoll.c, line 83:
>
>         WARN_ON_RT(irqs_disabled());
>         np->dev->poll_controller(np->dev);
>         WARN_ON_RT(irqs_disabled());
>
> and send me either the full bootlog, or the _first_ such BUG message
> you'll be getting. Which network controller is this?
>

OK. All affirmative. NIC is natsemi.

Here it is:

SysRq : IRQ 1/776: BUG in write_msg at drivers/net/netconsole.c:87
 [<c0104ee4>] dump_stack+0x1e/0x20 (20)
 [<e00ef0ab>] write_msg+0xab/0xf4 [netconsole] (52)
 [<c0117804>] __call_console_drivers+0x51/0x60 (32)
 [<c0117910>] call_console_drivers+0x6d/0x147 (40)
 [<c0117caf>] release_console_sem+0x48/0x100 (36)
 [<c0117bd5>] vprintk+0x127/0x174 (36)
 [<c0117aac>] printk+0x18/0x1a (16)
 [<c01f4835>] __handle_sysrq+0x38/0xed (40)
 [<c01ee426>] kbd_event+0xeb/0xfa (40)
 [<c025f694>] input_event+0x160/0x3d4 (44)
 [<c02620a2>] atkbd_report_key+0x3b/0x95 (32)
 [<c0262358>] atkbd_interrupt+0x25c/0x590 (60)
 [<c01f6fbe>] serio_interrupt+0x4f/0xa5 (44)
 [<c01f78b7>] i8042_interrupt+0xb8/0x1b8 (40)
 [<c0131dbc>] handle_IRQ_event+0x48/0x79 (32)
 [<c01325dd>] do_hardirq+0x86/0x123 (40)
 [<c0132712>] do_irqd+0x98/0xc9 (36)
 [<c012b7d7>] kthread+0x9c/0xc9 (48)
 [<c0102305>] kernel_thread_helper+0x5/0xb (548454420)
preempt count: 00000001
. 1-level deep critical section nesting:
.. entry 1: print_traces+0x16/0x48 [<c0104ee4>] / (dump_stack+0x1e/0x20
[<c0104ee4>])

BUG: sleeping function called from invalid context IRQ 1(776) at
kernel/mutex.c:37
in_atomic():0 [00000000], irqs_disabled():1
 [<c0104ee4>] dump_stack+0x1e/0x20 (20)
 [<c0114a23>] __might_sleep+0xb2/0xc7 (36)
 [<c012c0f2>] _mutex_lock+0x39/0x5e (28)
 [<c012c13a>] _mutex_lock_irqsave+0x11/0x15 (12)
 [<c027f9bc>] refill_skbs+0x13/0x6d (20)
 [<c027fae1>] find_skb+0x5d/0x9d (24)
 [<c027fc09>] netpoll_send_udp+0x3b/0x298 (48)
 [<e00ef050>] write_msg+0x50/0xf4 [netconsole] (52)
 [<c0117804>] __call_console_drivers+0x51/0x60 (32)
 [<c0117910>] call_console_drivers+0x6d/0x147 (40)
 [<c0117caf>] release_console_sem+0x48/0x100 (36)
 [<c0117bd5>] vprintk+0x127/0x174 (36)
 [<c0117aac>] printk+0x18/0x1a (16)
 [<c01f4835>] __handle_sysrq+0x38/0xed (40)
 [<c01ee426>] kbd_event+0xeb/0xfa (40)
 [<c025f694>] input_event+0x160/0x3d4 (44)
 [<c02620a2>] atkbd_report_key+0x3b/0x95 (32)
 [<c0262358>] atkbd_interrupt+0x25c/0x590 (60)
 [<c01f6fbe>] serio_interrupt+0x4f/0xa5 (44)
 [<c01f78b7>] i8042_interrupt+0xb8/0x1b8 (40)
 [<c0131dbc>] handle_IRQ_event+0x48/0x79 (32)
 [<c01325dd>] do_hardirq+0x86/0x123 (40)
 [<c0132712>] do_irqd+0x98/0xc9 (36)
 [<c012b7d7>] kthread+0x9c/0xc9 (48)
 [<c0102305>] kernel_thread_helper+0x5/0xb (548454420)
preempt count: 00000001
. 1-level deep critical section nesting:
.. entry 1: print_traces+0x16/0x48 [<c0104ee4>] / (dump_stack+0x1e/0x20
[<c0104ee4>])


Bye.
-- 
rncbc aka Rui Nuno Capela
rncbc@rncbc.org

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