linux-kernel - Re: [linux-pm] PM: cannot hibernate -- BUG at kernel/workqueue.c:3659

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Date:	Fri, 27 Jan 2012 02:01:55 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Jiri Slaby <jirislaby@...il.com>, Tejun Heo <tj@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Baohua.Song@....com,
	"pavel@....cz" <pavel@....cz>,
	Linux PM mailing list <linux-pm@...r.kernel.org>
Subject: Re: [linux-pm] PM: cannot hibernate -- BUG at kernel/workqueue.c:3659

On Thursday, January 26, 2012, Jiri Slaby wrote:
> On 01/26/2012 12:51 AM, Rafael J. Wysocki wrote:
> > IOW, Jiri, does the patch below help?
> 
> Yeah, this fixes the issue as well. Thanks.

Cool, thanks for the confirmation!

> > [BTW, the freeze_tasks()'s kerneldoc seems to be outdated.  Tejun?]
> > 
> > ---
> >  include/linux/freezer.h |    2 ++
> >  kernel/power/process.c  |   19 +++++++++++++++++++
> >  kernel/power/user.c     |    1 +
> >  3 files changed, 22 insertions(+)
> > 
> > Index: linux/include/linux/freezer.h
> > ===================================================================
> > --- linux.orig/include/linux/freezer.h
> > +++ linux/include/linux/freezer.h
> > @@ -39,6 +39,7 @@ extern bool __refrigerator(bool check_kt
> >  extern int freeze_processes(void);
> >  extern int freeze_kernel_threads(void);
> >  extern void thaw_processes(void);
> > +extern void thaw_kernel_threads(void);
> >  
> >  static inline bool try_to_freeze(void)
> >  {
> > @@ -174,6 +175,7 @@ static inline bool __refrigerator(bool c
> >  static inline int freeze_processes(void) { return -ENOSYS; }
> >  static inline int freeze_kernel_threads(void) { return -ENOSYS; }
> >  static inline void thaw_processes(void) {}
> > +static inline void thaw_kernel_threads(void) {}
> >  
> >  static inline bool try_to_freeze(void) { return false; }
> >  
> > Index: linux/kernel/power/process.c
> > ===================================================================
> > --- linux.orig/kernel/power/process.c
> > +++ linux/kernel/power/process.c
> > @@ -188,3 +188,22 @@ void thaw_processes(void)
> >  	printk("done.\n");
> >  }
> >  
> > +void thaw_kernel_threads(void)
> > +{
> > +	struct task_struct *g, *p;
> > +
> > +	pm_nosig_freezing = false;
> > +	printk("Restarting kernel threads ... ");
> > +
> > +	thaw_workqueues();
> > +
> > +	read_lock(&tasklist_lock);
> > +	do_each_thread(g, p) {
> > +		if (p->flags & (PF_KTHREAD | PF_WQ_WORKER))
> > +			__thaw_task(p);
> > +	} while_each_thread(g, p);
> > +	read_unlock(&tasklist_lock);
> > +
> > +	schedule();
> > +	printk("done.\n");
> > +}
> > Index: linux/kernel/power/user.c
> > ===================================================================
> > --- linux.orig/kernel/power/user.c
> > +++ linux/kernel/power/user.c
> > @@ -274,6 +274,7 @@ static long snapshot_ioctl(struct file *
> >  		swsusp_free();
> >  		memset(&data->handle, 0, sizeof(struct snapshot_handle));
> >  		data->ready = 0;
> > +		thaw_kernel_threads();
> >  		break;
> >  
> >  	case SNAPSHOT_PREF_IMAGE_SIZE:
> 
> 
> 

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