Ubuntu
linux package

  1. Bug #1901024
  2. Comment #6

Comment 6 for bug 1901024

Revision history for this message
Mauricio Faria de Oliveira (mfo) wrote :

Hi Rauno,

Thanks for reporting this bug; nice finding on pci=noats.

$ grep -A1 noats ~/git/linux/Documentation/admin-guide/kernel-parameters.txt
  noats [PCIE, Intel-IOMMU, AMD-IOMMU]
    do not use PCIe ATS (and IOMMU device IOTLB).

Wondering if the amd gfx drivers with ats/iommu (ie, w/out pci=noats) causes memory corruption:

The screenshot in #1 shows that initramfs unpacking failed -- say, something corrupted the compressed initramfs image loaded in memory -- and this happened closely to when AMD-Vi failed to access an IOMMU perf count(er? I guess.)

And it seems to be graphics related, not just ats/iommu code alone, which prints 'AMD-Vi' (it's in linux/drivers/iommu/amd/) since recovery mode, with 'nomodeset', works fine.

When you boot in recovery mode, do you see initramfs unpacking failed as well? (please check 'dmesg | grep -i initramfs')