Re: 2.6.9-rc2-mm4 ps hang ?

[Badari Pulavarty]

On Fri, 2004-10-01 at 12:09, Andrew Morton wrote:
> Badari Pulavarty <pbadari@xxxxxxxxxx> wrote:
> >
> > I randomly see "ps" hangs on my AMD64 system running 2.6.9-rc2-mm4.
> >  I don't remember seeing this on earlier kernels. Is this something
> >  known/fixed ?
> 
> hm.  I can see that access_process_vm() is doing lock_page() inside
> mmap_sem, which is a ranking bug, but it's not that.
> 
> And I see a distinct lack of flush_foo_page() calls after the by-hand
> modification of the user page.  But it's not that either.
> 
> Can you work out who is holding mmap_sem for writing?
> 

grr.. okay. It hangs randomly. Don't we have code to record the holder
of a sem somewhere ?

Thanks,
Badari

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