On Thu, Dec 10, 2015 at 04:30:24PM -0500, Chris Mason wrote:
> On Thu, Dec 10, 2015 at 02:35:55PM -0500, Dave Jones wrote:
> > On Thu, Dec 10, 2015 at 02:02:20PM -0500, Chris Mason wrote:
> > > On Tue, Dec 08, 2015 at 11:25:28PM -0500, Dave Jones wrote:
> > > > Not sure if I've already reported this one, but I've been seeing this
> > > > a lot this last couple days.
> > > >
> > > > kernel BUG at mm/page-writeback.c:2654!
> > > > invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN
> > > > CPU: 1 PID: 2566 Comm: trinity-c1 Tainted: G W
> > 4.4.0-rc4-think+ #14
> > > > task: ffff880462811b80 ti: ffff8800cd808000 task.ti: ffff8800cd808000
> > > > RIP: 0010:[<ffffffff8826ff40>] [<ffffffff8826ff40>]
> > clear_page_dirty_for_io+0x180/0x1d0
> > >
> > > Huh, are you able to reproduce at will? From this code path it should
> > > mean somebody else is unlocking a page they don't own.
> >
> > pretty easily yeah. I hit it maybe a couple dozen times yesterday.
> > So if you've got some idea of printk's to spray anywhere I can give
> > that a shot.
>
> I'd rather try to trigger it here. Going to have to add some way to
> record which stack trace last unlocked and/or freed the page.
I'm using..
trinity -q -l off -C8 -a64 -x fsync -x fdatasync -x syncfs -x sync
--enable-fds=testfile,pseudo
interestingly, if I just use 'testfile' by itself, I can't reproduce it.
(That means "create a bunch a few files in current dir and use their fds")
the "pseudo" bit means "also use fds from /proc, /sys and /dev".
strange.
(also, using trinity.git rather than the last version released, though
I doubt it makes a difference in this case)
Dave
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