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SubjectRe: BUG: sleeping function called from invalid context at mm/slub.c:793
On 01/10/2011 09:31 PM, Kirill A. Shutemov wrote:
> On Mon, Jan 10, 2011 at 10:52:05AM -0600, Christoph Lameter wrote:
> >
> > On Mon, 10 Jan 2011, Kirill A. Shutemov wrote:
> >
> > > Every time I run qemu with KVM enabled I get this in dmesg:
> > >
> > > [ 182.878328] BUG: sleeping function called from invalid context at mm/slub.c:793
> > > [ 182.878339] in_atomic(): 1, irqs_disabled(): 0, pid: 4992, name: qemu
> > > [ 182.878355] Pid: 4992, comm: qemu Not tainted 2.6.37+ #31
> > > [ 182.878361] Call Trace:
> > > [ 182.878381] [<c104e317>] ? __might_sleep+0xd0/0xd7
> > > [ 182.878394] [<c10ec337>] ? slab_pre_alloc_hook.clone.39+0x23/0x27
> > > [ 182.878404] [<c10ece27>] ? kmem_cache_alloc+0x22/0xc8
> > > [ 182.878414] [<c1030221>] ? init_fpu+0x44/0x7b
> >
> > fpu_alloc() does call kmem_cache_alloc with GFP_KERNEL although we are in
> > an atomic context.
>
> Something like this?
>
> ---
> From 7c6fbfed72e7d22cbdf7393f9711d521e0fbb4a6 Mon Sep 17 00:00:00 2001
> From: Kirill A. Shutemov<kirill@shutemov.name>
> Date: Mon, 10 Jan 2011 21:24:23 +0200
> Subject: [PATCH] x86, fpu_alloc(): call kmem_cache_alloc() with GFP_ATOMIC
>
> [ 182.878328] BUG: sleeping function called from invalid context at mm/slub.c:793
> [ 182.878339] in_atomic(): 1, irqs_disabled(): 0, pid: 4992, name: qemu
> [ 182.878355] Pid: 4992, comm: qemu Not tainted 2.6.37+ #31
> [ 182.878361] Call Trace:
> [ 182.878381] [<c104e317>] ? __might_sleep+0xd0/0xd7
> [ 182.878394] [<c10ec337>] ? slab_pre_alloc_hook.clone.39+0x23/0x27
> [ 182.878404] [<c10ece27>] ? kmem_cache_alloc+0x22/0xc8
> [ 182.878414] [<c1030221>] ? init_fpu+0x44/0x7b
> [ 182.878426] [<c130cc29>] ? do_device_not_available+0x0/0x1b
> [ 182.878435] [<c1030221>] ? init_fpu+0x44/0x7b
> [ 182.878444] [<c102a588>] ? math_state_restore+0x24/0x47
> [ 182.878453] [<c130cc39>] ? do_device_not_available+0x10/0x1b
> [ 182.878462] [<c130c4ab>] ? error_code+0x67/0x6c
> [ 182.878475] [<c1012340>] ? kvm_load_guest_fpu+0xa1/0xaa
> [ 182.878484] [<c1013364>] ? kvm_arch_vcpu_ioctl_run+0x798/0xbe8
> [ 182.878496] [<c1004523>] ? kvm_vcpu_ioctl+0x105/0x46e
> [ 182.878508] [<c107dce0>] ? get_futex_key+0x73/0x132
> [ 182.878517] [<c107e352>] ? futex_wake+0xb6/0xc0
> [ 182.878527] [<c107f8d6>] ? do_futex+0x87/0x669
> [ 182.878535] [<c100441e>] ? kvm_vcpu_ioctl+0x0/0x46e
> [ 182.878545] [<c1101ebf>] ? do_vfs_ioctl+0x4a0/0x4d1
> [ 182.878554] [<c130e348>] ? do_page_fault+0x2eb/0x316
> [ 182.878564] [<c1101f36>] ? sys_ioctl+0x46/0x68
> [ 182.878572] [<c130bdc0>] ? syscall_call+0x7/0xb
> [ 182.878585] [<c1300000>] ? aer_probe+0x1da/0x274
>
> Signed-off-by: Kirill A. Shutemov<kirill@shutemov.name>
> ---
> arch/x86/include/asm/i387.h | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h
> index ef32890..8b896dd 100644
> --- a/arch/x86/include/asm/i387.h
> +++ b/arch/x86/include/asm/i387.h
> @@ -426,7 +426,7 @@ static inline int fpu_alloc(struct fpu *fpu)
> {
> if (fpu_allocated(fpu))
> return 0;
> - fpu->state = kmem_cache_alloc(task_xstate_cachep, GFP_KERNEL);
> + fpu->state = kmem_cache_alloc(task_xstate_cachep, GFP_ATOMIC);
> if (!fpu->state)
> return -ENOMEM;
> WARN_ON((unsigned long)fpu->state& 15);

If this fails, a task will be killed. I'll patch kvm to ensure that the
fpu is initialized.

--
error compiling committee.c: too many arguments to function



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