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SubjectRe: [patch] Real-Time Preemption, -RT-2.6.9-mm1-U10.2
From
Ingo Molnar wrote:
>
> Rui Nuno Capela wrote:
>
>> Regarding the jackd -R issue, I was trying to capture some debug data
>> via netconsole on my laptop (P4/UP) running RT-U10.2, and when the
>> system freezes as reported before, I was able to kick the SysRq+T.
>> But, instead of a task trace list, I get the following:
>>
>> SysRq : <3>BUG: sleeping function called from invalid context IRQ 1(776)
>> at kernel/mutex.c:37
>> in_atomic():1 [00000001], irqs_disabled():1
>> [<c0104ee4>] dump_stack+0x1e/0x20 (20)
>> [<c0114a23>] __might_sleep+0xb2/0xc7 (36)
>> [<c012c0f2>] _mutex_lock+0x39/0x5e (28)
>
>> preempt count: 00000002
>> . 2-level deep critical section nesting:
>> .. entry 1: __sysrq_lock_table+0x12/0x14 [<c01f482b>] /
>> (__handle_sysrq+0x1a/0xed [<c01f482b>])
>> .. entry 2: print_traces+0x16/0x48 [<c0104ee4>] / (dump_stack+0x1e/0x20
>
> does the patch below help?
>
> Ingo
>
> --- linux/drivers/char/sysrq.c.orig
> +++ linux/drivers/char/sysrq.c
> @@ -252,7 +252,7 @@ static struct sysrq_key_op sysrq_kill_op
>
>
> /* Key Operations table and lock */
> -static DECLARE_RAW_SPINLOCK(sysrq_key_table_lock);
> +static DECLARE_SPINLOCK(sysrq_key_table_lock);
> #define SYSRQ_KEY_TABLE_LENGTH 36
> static struct sysrq_key_op *sysrq_key_table[SYSRQ_KEY_TABLE_LENGTH] = {
> /* 0 */ &sysrq_loglevel_op,
>

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
[<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)
[<c027f913>] refill_skbs+0x13/0x6d (20)
[<c027fa38>] find_skb+0x5d/0x9d (24)
[<c027fb60>] netpoll_send_udp+0x3b/0x298 (48)
[<e0136047>] write_msg+0x47/0x5c [netconsole] (36)
[<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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