[dm-devel] [BUG REPORT] Kernel panic on 3.9.0-rc7-4-gbb33db7

[Jens Axboe]

On Thu, Apr 18 2013, Tejun Heo wrote:
> On Thu, Apr 18, 2013 at 10:57:54PM -0700, Tejun Heo wrote:
> > No wonder this thing crashes.  Chris, can't the original bio carry
> > bbio in bi_private and let end_bio_extent_readpage() free the bbio
> > instead of abusing bi_bdev like this?
> 
> BTW, I think it's a bit too late to fix this properly from btrfs side
> unless we're gonna do -rc8, so let's revert the TP patch for now and
> sort this out in the next devel cycle.  AFAICS, while disturbingly
> (ha|yu)cky, the bi_bdev trick should be okay without the new TP.

The tracing commit was already backed out yesterday, so no problems
there. I figured it'd be a bit too late to fix something this nasty in a
suitably clean and straight forward fashion.

-- 
Jens Axboe