linux-kernel - Re: Qemu & KVM bug

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Message-ID: <Pine.LNX.4.64.0802131621440.7699@twin.jikos.cz>
Date:	Wed, 13 Feb 2008 16:24:53 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Zdenek Kabelac <zdenek.kabelac@...il.com>
cc:	linux-kernel@...r.kernel.org, Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: Qemu & KVM bug

On Wed, 13 Feb 2008, Zdenek Kabelac wrote:

> I get this bug in my log whenever I start qemu-kvm - I do not use kqemu 
> module - so it's with plain kernel modules. If more details are needed - 
> just ask. (Cpu; C2D)
> BUG: sleeping function called from invalid context at kernel/rwsem.c:48
> in_atomic():1, irqs_disabled():0
> INFO: lockdep is turned off.
> Pid: 26600, comm: qemu-kvm Not tainted 2.6.25-rc1 #29

This has been obviously caused by Marcelo's (added to CC) commit 
10589a4699b, which added down_write(mmap_sem) to alloc_apic_access_page(), 
which is called with preempt disabled from vmx_create_vcpu().

-- 
Jiri Kosina
SUSE Labs

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