Dave Lloyd <dave at davelloyd.com> writes: > On Tue, May 14, 2013 at 6:14 PM, Eric W. Biederman > <ebiederm at xmission.com> wrote: > >> >> Oh. Yeah. IB definitely sets up memory for ongoing dma. So if it >> doesn't have a shutdown method and IB traffic comes in during boot just >> about anything cood happen. >> >>> I'm inclined to chalk the ACPI Error mesages up to potentially buggy >>> BIOS/hardware from the vendor since pata_amd and pata_acpi are in wide >>> use and I would expect to see more issues reported were there truly an >>> issue with rebooting with kexec and not unloading pata_amd and >>> pata_acpi. >> >> Maybe. Or it might be luck of timing, which memory was stomped when >> incomming IB packets stomped on memory. >> >> Eric >> > > Removing the infiniband drivers in /etc/init.d/halt right before the > kexec -e definitely seems to have done the trick. Thanks! > > My follow up question is, if we are clearing the bus master DMA bit, > why are the Mellanox not reset or at least stop doing DMA until the > driver is loaded again? Is this a case of the Mellanox hardware > needing an extra poke to do the right thing? Some hardware does not respect the bus master bit. I assume that Mellanox has that problem. Eric
