Messages in this thread | | | Date | Thu, 6 Mar 2008 14:55:33 +0100 | From | Jens Axboe <> | Subject | Re: Linux 2.6.25-rc4 |
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On Thu, Mar 06 2008, Bartlomiej Zolnierkiewicz wrote: > On Thursday 06 March 2008, Ingo Molnar wrote: > > > > * Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> wrote: > > > > > The problem looks very similar to the one recently reported by Anders: > > > > > > http://lkml.org/lkml/2008/2/22/239 > > > > > > "Trying out 2.6.25-rc2 smartd always causes my box to hang. I can > > > switch vt:s and the keyboard seems to work. > > > > > > Using sysrq-e I noticed a callpath open -> ext3 -> journals -> > > > sync_buffer -> io_scheduel -> generic_unplig_device. I'd guess the > > > open stems from smartd. Removing smartd from the startup, I'm now > > > using rc2 fine..." > > > > > > Initially we thought that it is an IDE regression but after some > > > testing and further investigation it seems that IDE changes just made > > > it more likely to occur (yesterday it turned out that the kernel with > > > the "guilty" IDE commit sometimes boots fine). The issue is easily > > > reproducible. > > > > > > PS We've already verified that it is not PREEMPT related or a compiler > > > bug. > > > > smartd is not active here though - and starting/restarting it doesnt > > provoke a hang. > > I was a bit unclear on this, the problem is easily reproducible but _only_ > on Anders' system (I couldn't reproduce it with smartd here either).
What IO scheduler is Anders using (and does it have an impact, eg does it hang with deadline as well)?
-- Jens Axboe
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