linux-kernel - Re: BUG: sleeping function called from invalid context at include/linux/freezer.h:45

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Date:	Tue, 10 Jan 2012 11:22:29 +0530
From:	Amit Sahrawat <amit.sahrawat83@...il.com>
To:	Kyungmin Park <kmpark@...radead.org>
Cc:	Pavel Machek <pavel@....cz>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Len Brown <len.brown@...el.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>
Subject: Re: BUG: sleeping function called from invalid context at include/linux/freezer.h:45

On Tue, Jan 10, 2012 at 9:57 AM, Kyungmin Park <kmpark@...radead.org> wrote:
> Dear all
>
> with the latest kernel. I got the below bug message.
> It calls the sleep function. Does it intended operation?
>
> static inline bool try_to_freeze(void)
> {
>        might_sleep();
>        if (likely(!freezing(current)))
>                return false;
>        return __refrigerator(false);
> }
this change is part of this GIT:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=a0acae0e886d44bd5ce6d2f173c1ace0fcf0d9f6

>
> # poweroff
> [    6.852523] BUG: sleeping function called from invalid context at
> include/linux/freezer.h:45
> [    6.859489] in_atomic(): 0, irqs_disabled(): 128, pid: 1, name: init
> [    6.865846] [<c0013508>] (unwind_backtrace+0x0/0xec) from
> [<c0010124>] (do_signal+0x88/0x588)
> [    6.874337] [<c0010124>] (do_signal+0x88/0x588) from [<c001063c>]
> (do_notify_resume+0x18/0x38)
> [    6.882928] [<c001063c>] (do_notify_resume+0x18/0x38) from
> [<c000dc18>] (work_pending+0x24/0x28)
is this the complete backtrace...?
The above backtrace shows that freezing was called from a context
wherein - IRQs are disabled - which resulted in this error.
How about checking ...
BUG_ON(irqs_disabled()); in try_to_freeze()...
not sure though... please check and update me also...
>
> commit e4e11180dfa545233e5145919b75b7fac88638df
> Merge: 37cfc3f adc0e91
> Author: Linus Torvalds <torvalds@...ux-foundation.org>
> Date:   Mon Jan 9 17:37:37 2012 -0800
>
>    Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vi
>
> Thank you,
> Kyungmin Park
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