On Wed, Aug 29, 2012 at 12:00:47AM +0300, Sergey Senozhatsky wrote:
> x86: use new exception_enter()/exception_exit() API in
> do_device_not_available()
>
> RCU can be in extended quiescent state when do_device_not_available() called.
>
> [ 676.400274] RCU used illegally from idle CPU!
> [ 676.400274] rcu_scheduler_active = 1, debug_locks = 0
> [ 676.400278] RCU used illegally from extended quiescent state!
> [ 676.400282] 2 locks held by sed/9468:
> [ 676.400285] #0: (&rq->lock){-.-.-.}, at: [<ffffffff814c67cf>]
> __schedule+0x1c0/0x992
> [ 676.400304] #1: (rcu_read_lock){.+.+..}, at: [<ffffffff8106a880>]
> cpuacct_charge+0x27/0x1e0
> [ 676.400321]
> [ 676.400329] Call Trace:
> [ 676.400340] [<ffffffff8108933a>] lockdep_rcu_suspicious+0x109/0x112
> [ 676.400347] [<ffffffff8106a8f7>] cpuacct_charge+0x9e/0x1e0
> [ 676.400353] [<ffffffff8106a880>] ? cpuacct_charge+0x27/0x1e0
> [ 676.400359] [<ffffffff814c67cf>] ? __schedule+0x1c0/0x992
> [ 676.400366] [<ffffffff8106d525>] update_curr+0x159/0x200
> [ 676.400375] [<ffffffff8100a04f>] ? init_fpu+0x4e/0x8f
> [ 676.400382] [<ffffffff8106e0da>] put_prev_task_fair+0x2a/0xac
> [ 676.400388] [<ffffffff814c69a7>] __schedule+0x398/0x992
> [ 676.400397] [<ffffffff810b4f0a>] ? rcu_irq_exit+0x83/0x99
> [ 676.400404] [<ffffffff814c8bf0>] ? retint_restore_args+0x13/0x13
> [ 676.400411] [<ffffffff810889e9>] ? lock_is_held+0x2d/0xa5
> [ 676.400414] [<ffffffff8100a04f>] ? init_fpu+0x4e/0x8f
> [ 676.400417] [<ffffffff81065d0a>] __cond_resched+0x28/0x34
> [ 676.400420] [<ffffffff814c701a>] _cond_resched+0x2e/0x35
> [ 676.400425] [<ffffffff8111cad4>] kmem_cache_alloc+0x4c/0x1c5
> [ 676.400430] [<ffffffff810021ff>] ? math_state_restore+0x1f/0xdc
> [ 676.400433] [<ffffffff8100a04f>] init_fpu+0x4e/0x8f
> [ 676.400437] [<ffffffff8100220e>] math_state_restore+0x2e/0xdc
> [ 676.400440] [<ffffffff814c982e>] do_device_not_available+0xe/0x10
> [ 676.400445] [<ffffffff814d161b>] device_not_available+0x1b/0x20
>
>
> Signed-off-by: Sergey Senozhatsky <sergey.senozhat...@gmail.com>
>
> ---
>
> arch/x86/kernel/traps.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
> index ab82cbd..dff3e72 100644
> --- a/arch/x86/kernel/traps.c
> +++ b/arch/x86/kernel/traps.c
> @@ -654,7 +654,9 @@ do_device_not_available(struct pt_regs *regs, long
> error_code)
> return;
> }
> #endif
> + exception_enter(regs);
> math_state_restore(); /* interrupts still off */
> + exception_enter(regs);
Shouldn't that be exception_exit actually?
--
Regards/Gruss,
Boris.
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