Messages in this thread | ![/](/images/icornerl.gif) | | Subject | Re: X86: kexec issues with i915 in 3.14 | From | Stefani Seibold <> | Date | Mon, 14 Apr 2014 21:49:34 +0200 |
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Am Montag, den 14.04.2014, 00:28 +0000 schrieb Woodhouse, David: > On Sun, 2014-04-13 at 22:01 +0200, Stefani Seibold wrote: > > Rebooting my kernel vanilla kernel 3.14 will fail with tons of kernel > > log messages: > > > > [ 0.262754] IOMMU: Setting identity map for device 0000:00:1a.0 [0x7c45f000 - 0x7c46bfff] > > [ 0.262780] IOMMU: Setting identity map for device 0000:00:14.0 [0x7c45f000 - 0x7c46bfff] > > [ 0.262798] IOMMU: Prepare 0-16MiB unity mapping for LPC > > [ 0.262807] IOMMU: Setting identity map for device 0000:00:1f.0 [0x0 - 0xffffff] > > [ 0.262948] PCI-DMA: Intel(R) Virtualization Technology for Directed I/O > > [ 0.262948] dmar: DRHD: handling fault status reg 3 > > [ 0.262951] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr ffffe000 > > DMAR:[fault reason 05] PTE Write access is not set > > I'm inferring from the subject line that you mean kexec, not > "rebooting"? >
Rebooting via BIOS works, but booting via kexec will result the message storm or hang kernel with a corrupted display.
> It looks like a peripheral device is being left active and doing DMA by > the previous kernel, rather than being shut down. So as soon as the new > kernel resets the IOMMU mappings, that peripheral device is causing > faults. > > We really ought to rate-limit the faults and isolate the offending > device before there are 21,000 of them. As discussed elsewhere recently, > we could do with a way to tell the PCI layer that it offended us but I > suppose we could at *least* stop the IOMMU from reporting faults for it. > > Is this new behaviour? I'm not sure why this should have changed... >
I can reproduce the behaviour also with a 3.13.7 kernel.
One thing i found after the end of the 21.000 messages was a GPU crash:
[ 5.002484] r8169 0000:03:00.0 eth0: link up [ 5.002489] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready [ 6.745051] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... blitter ring idle [ 11.743768] [drm] stuck on render ring [ 11.743773] [drm] GPU crash dump saved to /sys/class/drm/card0/error [ 11.743774] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace. [ 11.743775] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel [ 11.743777] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue. [ 11.743778] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it. [ 14.240743] systemd-journald[158]: File /var/log/journal/bb613621feef82d686edde0046e9bcea/user-1000.journal corrupted or uncleanly shut down, renaming and replacing.
- Stefani
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