linux-kernel - Re: BUG: sleeping function called from invalid context at arch/powerpc/kernel/rtas.c:463

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Message-ID: <44E9624D.4060203@cn.ibm.com>
Date:	Mon, 21 Aug 2006 15:35:41 +0800
From:	Yao Fei Zhu <walkinair@...ibm.com>
To:	Nathan Lynch <ntl@...ox.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: BUG: sleeping function called from invalid context at arch/powerpc/kernel/rtas.c:463

Nathan Lynch wrote:

>Hi,
>
>Yao Fei Zhu wrote:
>  
>
>>Hi, all
>>
>>Online and offline cpus in 2.6.18-rc4/PPC64 will trigger Call Trace
>>like this,
>>
>>[root@...de11 ~]# echo 0 > /sys/devices/system/cpu/cpu0/online
>>[root@...de11 ~]# dmesg -c
>>BUG: sleeping function called from invalid context at 
>>arch/powerpc/kernel/rtas.c:463
>>in_atomic():0, irqs_disabled():1
>>Call Trace:
>>[C0000000725EB9C0] [C00000000000FB70] .show_stack+0x68/0x1b0 (unreliable)
>>[C0000000725EBA60] [C000000000053EB4] .__might_sleep+0xd8/0xf4
>>[C0000000725EBAE0] [C00000000001D5D8] .rtas_busy_delay+0x20/0x5c
>>[C0000000725EBB70] [C00000000001DC00] .rtas_set_indicator+0x6c/0xcc
>>[C0000000725EBC10] [C000000000049130] .xics_migrate_irqs_away+0x6c/0x20c
>>[C0000000725EBCD0] [C000000000048EEC] .pSeries_cpu_disable+0x98/0xb4
>>[C0000000725EBD50] [C000000000029A24] .__cpu_disable+0x44/0x58
>>[C0000000725EBDC0] [C000000000082030] .take_cpu_down+0x10/0x38
>>[C0000000725EBE40] [C000000000090000] .do_stop+0x16c/0x20c
>>[C0000000725EBEE0] [C000000000078EBC] .kthread+0x128/0x178
>>[C0000000725EBF90] [C0000000000271DC] .kernel_thread+0x4c/0x68
>>    
>>
>
>
>The fix for this was committed to Linus's tree after 2.6.18-rc4; look for
>
>[POWERPC] Fix might-sleep warning on removing cpus
>
>in the change history.
>-
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>  
>
Yes, tested the fix, thanks.

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