Subject: Re: 2.6.26.6-rt11: BUGs (sleeping function called from invalid
 context)
From: Peter Zijlstra <peterz@infradead.org>
To: Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>
Cc: Steven Rostedt <rostedt@goodmis.org>, LKML <linux-kernel@vger.kernel.org>,
       Ingo Molnar <mingo@elte.hu>
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Date: Sat, 08 Nov 2008 09:47:38 +0100
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On Fri, 2008-11-07 at 15:52 -0800, Fernando Lopez-Lezcano wrote:
> On Fri, 2008-11-07 at 22:47 +0100, Peter Zijlstra wrote:
> > On Fri, 2008-11-07 at 13:35 -0800, Fernando Lopez-Lezcano wrote:
> > > On Fri, 2008-11-07 at 20:16 +0100, Peter Zijlstra wrote:
> > > > On Fri, 2008-11-07 at 14:01 -0500, Steven Rostedt wrote:
> > > > > Peter, I think we've seen this before. It is the highmem code sleeping.
> > > > 
> > > > I've been working on an alternative kmap_atomic implementation for -rt,
> > > > the below has been build and booted but not stressed, anybody care to
> > > > give it a spin ?
> > > 
> > > I'll give it a try. Anything in particular I should try to do? Or not
> > > do? Or watch for?
> > 
> > Lots of I/O should stress the i386 highmem stuff. If all is well it
> > works, if not, crashes and splats.
> 
> Crashes and splats on boot... sorry, I don't have a way to capture the
> kernel oops (or whatever happens, I can only see the end of the
> printout)
> 
> -- Fernando
> 
> PS: things left on the screen (top to bottom):
> 
> ? speedstep_detect_processor
> ? __copy_from_user_ll_noccache_nozero
> iov_iter_copy_from_user_atomic
> ? generic_file_buffered_write
> generic_file_buffered_write
> ? avs_has_perm_noaudit
> ? __rt_spin_lock
> ? selinux_inode_need_killpriv
> ? __rt_spin_lock
> mnt_drop_write
> __generic_file_aio_write_nolock
> generic_file_aio_write
> do_sync_write
> ? __enqueue_entity
> ? autoremove_wake_function
> ? selinux_file_oermission
> ? security_file_permission
> ? do_sync_write
> vfs_write
> sys_write
> ? schedule_tail
> ? ret_from_fork
> ? thread_kernel_helper

Oh well, thanks for trying, I guess I need to go run this on real
hardware, which means finding where I left this i386 distro on the test
boxen :-)
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