Re: 2.6.29-rc3: weird process after resume

[Takashi Iwai]

At Wed, 4 Feb 2009 18:56:45 -0800,
Andrew Morton wrote:
> 
> On Wed, 4 Feb 2009 18:31:42 -0800 Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> 
> > On Wed, 04 Feb 2009 17:45:13 -0800 Alex Romosan <romosan@xxxxxxxxxxxxxxx> wrote:
> > 
> > > Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> writes:
> > > 
> > > > On Wed, 04 Feb 2009 09:25:20 -0800
> > > > Alex Romosan <romosan@xxxxxxxxxxxxxxx> wrote:
> > > >
> > > >> this is on a thinkpad t61p with an intel core2 cpu. i just noticed
> > > >> that after resuming from suspending to memory i get a weirdly named
> > > >> process. i did a ps before and after and the only difference was that
> > > >> before i had this process:
> > > >> 
> > > >>   [hda0/1]
> > > >> 
> > > >> and after this one:
> > > >> 
> > > >>   [__?__;??____D__"?______]
> > > >> 
> > > >> with everything else being the same. the laptop seems to be working
> > > >> fine and the problem could have been there for a while but i just
> > > >> didn't notice it. i am including my .config file. let me know if you
> > > >> need anything else.
> > > >
> > > > Were earlier kernels OK?  If so, which version?
> > > 
> > > i just tried 2.6.28 and there was no [hda0] kernel thread. 2.6.29-rc1
> > > and rc2 never resumed from suspend so i couldn't really try it.
> > > 
> > > > What the heck is that kernel thread anyway?  It looks like something
> > > > derived from an IDE device.
> > > 
> > > i have no idea. hda is the cdrom (the disk is sata and shows up as
> > > sda).
> > > 
> > 
> > <rummages through a 68MB diff for a while>
> > 
> > <finds a plum>
> > 
> > +       snprintf(qname, sizeof(qname), "hda%d", card->number);
> > +       bus->workq = create_workqueue(qname);
> > +       if (!bus->workq) {
> > +               snd_printk(KERN_ERR "cannot create workqueue %s\n", qname);
> > +               kfree(bus);
> > +               return -ENOMEM;
> > +       }
> > 
> > so it's not IDE after all.
> > 
> > commit 6acaed38a32e8571e92cfc832b971f9e4450c207
> > Author:     Takashi Iwai <tiwai@xxxxxxx>
> > AuthorDate: Mon Jan 12 10:09:24 2009 +0100
> > Commit:     Takashi Iwai <tiwai@xxxxxxx>
> > CommitDate: Mon Jan 12 10:33:56 2009 +0100
> > 
> >     ALSA: hda - Use own workqueue
> > 
> 
> btw.  Please use create_singlethread_workqueue() if at all possible.  I
> don't think we need a thread per CPU here.

Sorry I always forget that...

Alex, could you try the patch below?  It's now in sound git tree:
   git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6.git


thanks,

Takashi

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