LinuxCon Japan is the premiere Linux conference in Asia that brings together a unique blend of core developers, administrators, users, community managers and industry experts.
CloudOpen Japan is a conference celebrating and exploring the open source projects, technologies and companies who make up the cloud. It’s built on a belief that open works: for users, for industry and for technology.
One of the biggest problem on kdump is that kdump kernel can be unstable after switched from first kernel. The kdump kernel boot is disturbed by device interruption or DMA which is derived from I/O issued in first kernel, it causes kernel panic, driver error, and at last kdump fails. Recently this problem surfaces when iommu is used for PCI passthrough on KVM guest. This presentation shows introduction of kdump reliability problem and its solution by resetting devices at kdump kernel boot time to stop ongoing DMA and cleaning up them.
The audience is expected to be interested in kdump, especially its reliability, to have basic skills to operate linux system, and to have very basic kernel knowledge if interested also in technical aspects. Knowledge of device(PCI, DMA, etc) is helpful to understand presentation more deeply.