Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-U10.2

From: Rui Nuno Capela (rncbc_at_rncbc.org)
Date: 10/23/04

  • Next message: Bernd Petrovitsch: "Re: Linux v2.6.9 and GPL Buyout" 
    Date:	Sat, 23 Oct 2004 13:30:17 +0100 (WEST)
To: "Ingo Molnar" <mingo@elte.hu>

    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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