Re: kern/47097: ahcisata(4) triggers panic when disk I/O error is caused

["T.SHIOZAKI" <tshiozak%bsdclub.org@localhost>]

> On Sat, Oct 20, 2012 at 03:50:00PM +0000, tshiozak%bsdclub.org@localhost 
> wrote:
> > when disk I/O error is caused, ahcisata(4) seems to call tsleep() under 
> > interrupt context and it triggers panic.
> > 
> > call trace is here:
> > 
> > vpanic
> > kern_assert
> > callout_halt
> > sleepq_block
> > ahci_do_reset_drive
> > ahci_reset_drive
> > wddone
> > ahci_bio_complete
> > ahci_intr_port
> > ahci_intr
> 
> The attached patch should work around it. But this is going to
> delay() for half a second, which is bad. Something better is needed,
> so we can reset the drive from the atabus thread.

I confirmed that the patch fixes the problem.  Thanks.

---
Takuya SHIOZAKI