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On Wed, Nov 22 2006, Jesper Juhl wrote: > On 22/11/06, Jens Axboe <jens.axboe@oracle.com> wrote: > >On Tue, Nov 21 2006, Linus Torvalds wrote: > >> I don't think we use any irq-disable locking in the VM itself, but I > >could > >> imagine some nasty situation with the block device layer getting into a > >> deadlock with interrupts disabled when it runs out of queue entries and > >> cannot allocate more memory.. > > > >Not likely. Request allocation is done with GFP_NOIO and backed by a > >memory pool, so as long the vm doesn't go totally nuts because > >__GFP_WAIT is set, we should be safe there. If it did go crazy, I > >suspect a sysrq-t would still work. > > > >If bouncing is involved for swap, we do have a potential deadlock issue > >that isn't fixed yet. I just whipped up this completely untested patch, > >it should shed some light on that issue. > > > Thanks Jens, I'll apply that later tonight and force a few lockups and > see if I get any extra details with that patch. Can you post a full dmesg too, as well as clarify which device holds the swap space? -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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