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Message-ID: <4176403B.5@stud.feec.vutbr.cz>
Date: Wed, 20 Oct 2004 12:38:51 +0200
From: Michal Schmidt <xschmi00@stud.feec.vutbr.cz>
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To: Ingo Molnar <mingo@elte.hu>
CC: linux-kernel@vger.kernel.org, Lee Revell <rlrevell@joe-job.com>,
       Rui Nuno Capela <rncbc@rncbc.org>, 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>,
       Fernando Pablo Lopez-Lezcano <nando@ccrma.Stanford.EDU>
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.9-rc4-mm1-U8
References: <20041012195424.GA3961@elte.hu> <20041013061518.GA1083@elte.hu> <20041014002433.GA19399@elte.hu> <20041014143131.GA20258@elte.hu> <20041014234202.GA26207@elte.hu> <20041015102633.GA20132@elte.hu> <20041016153344.GA16766@elte.hu> <20041018145008.GA25707@elte.hu> <20041019124605.GA28896@elte.hu> <20041019180059.GA23113@elte.hu> <20041020094508.GA29080@elte.hu>
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Ingo Molnar wrote:
> i have released the -U8 Real-Time Preemption patch:
> 
>   http://redhat.com/~mingo/realtime-preempt/realtime-preempt-2.6.9-rc4-mm1-U8
> 

I'm getting these BUGs when I use netconsole with Real-Time Preemption 
(but netconsole works):

kjournald starting.  Commit interval 5 seconds
BUG: sleeping function called from invalid context kjournald(775) at 
kernel/mutex.c:25
in_atomic():0 [00000000], irqs_disabled():1
  [<c0105fbe>] dump_stack+0x1e/0x20 (20)
  [<c01194d8>] __might_sleep+0xb8/0xd0 (36)
  [<c0130bc0>] _mutex_lock+0x20/0x40 (20)
  [<c02675f7>] netpoll_send_skb+0x37/0xc0 (28)
  [<c0231081>] write_msg+0x41/0x60 (36)
  [<c011c208>] __call_console_drivers+0x58/0x60 (32)
  [<c011c326>] call_console_drivers+0x96/0x140 (40)
  [<c011c6e1>] release_console_sem+0x71/0x100 (36)
  [<c011c5b6>] vprintk+0x116/0x180 (36)
  [<c011c498>] printk+0x18/0x20 (16)
  [<c01a31af>] kjournald+0x8f/0x250 (140)
  [<c01032d1>] kernel_thread_helper+0x5/0x14 (141484052)
preempt count: 00000001
. 1-level deep critical section nesting:
.. entry 1: print_traces+0x18/0x50 / (dump_stack+0x1e/0x20)

EXT3 FS on hda8, <3>BUG: sleeping function called from invalid context 
mount(786) at kernel/mutex.c:25
in_atomic():0 [00000000], irqs_disabled():1
  [<c0105fbe>] dump_stack+0x1e/0x20 (20)
  [<c01194d8>] __might_sleep+0xb8/0xd0 (36)
  [<c0130bc0>] _mutex_lock+0x20/0x40 (20)
  [<c02675f7>] netpoll_send_skb+0x37/0xc0 (28)
  [<c0231081>] write_msg+0x41/0x60 (36)
  [<c011c208>] __call_console_drivers+0x58/0x60 (32)
  [<c011c302>] call_console_drivers+0x72/0x140 (40)
  [<c011c6e1>] release_console_sem+0x71/0x100 (36)
  [<c011c5b6>] vprintk+0x116/0x180 (36)
  [<c011c498>] printk+0x18/0x20 (16)
  [<c01989f2>] ext3_setup_super+0xd2/0x1c0 (80)
  [<c019a5ed>] ext3_remount+0x12d/0x190 (48)
  [<c015d9b0>] do_remount_sb+0xa0/0xf0 (32)
  [<c0173c6d>] do_remount+0x6d/0xc0 (36)
  [<c01745fb>] do_mount+0x19b/0x1b0 (116)
  [<c01749e7>] sys_mount+0x97/0xe0 (48)
  [<c010518f>] syscall_call+0x7/0xb (-8124)
preempt count: 00000001
. 1-level deep critical section nesting:
.. entry 1: print_traces+0x18/0x50 / (dump_stack+0x1e/0x20)

internal journal


I have hacked the sk98lin driver to support netpoll (I sent the patch to 
netdev), so maybe I did something wrong and these BUGs are my own fault.

Does anybody else use netconsole with Real-Time Preemption?

Michal
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