linux-kernel - Re: [ANNOUNCE] 2.6.33.1-rt11

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Date:	Thu, 1 Apr 2010 11:55:04 -0600
From:	Xianghua Xiao <xiaoxianghua@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [ANNOUNCE] 2.6.33.1-rt11 - BUG?

I'm testing 2.6.33.1 on ppc 834x with rt11 patch. After system is up I
keep seeing this same message from dmesg:

> BUG: sleeping function called from invalid context at kernel/rtmutex.c:684
> pcnt: 0 0 in_atomic(): 0, irqs_disabled(): 1, pid: 16, name: events/0
> Call Trace:
> [cf85be80] [c00096cc] show_stack+0x6c/0x1a4 (unreliable)
> [cf85beb0] [c001f928] __might_sleep+0x104/0x108
> [cf85bec0] [c03cb444] rt_spin_lock+0xa0/0xa4
> [cf85bed0] [c0270b6c] lock_tx_qs+0x40/0x68
> [cf85bef0] [c02712cc] adjust_link+0x4c/0x240
> [cf85bf20] [c026d5ec] phy_state_machine+0x3bc/0x628
> [cf85bf40] [c003e69c] worker_thread+0x148/0x1f0
> [cf85bfa0] [c0042ec0] kthread+0x84/0x88
> [cf85bff0] [c00137f8] kernel_thread+0x4c/0x68
> BUG: sleeping function called from invalid context at kernel/rtmutex.c:684
> pcnt: 0 0 in_atomic(): 0, irqs_disabled(): 1, pid: 16, name: events/0
>
> #uname -a
> Linux 2.6.33.1-rt11 #3 PREEMPT RT Thu Apr 1 11:58:25 CDT 2010 ppc unknown
>

This does not hang/lock the system yet...google reported similar 'bug'
on older kernels. Is this a bug from 2.6.33.1-rt11 patch or I have to
change phy.c somehow to avoid it? This traces back to a mutex lock in
phy.c.

Xianghua
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