On Tue, Sep 11, 2018 at 10:17:44AM +0200, Takashi Iwai wrote: > [ seems like my previous post didn't go out properly; if you have > already received it, please discard this one ]
Sorry, I got it, it's just in my large queue :( > Hi Rafael, Greg, > > James Wang reported on SUSE bugzilla that his machine spews many > AMD-Vi errors at reboot like: > > [ 154.907879] systemd-shutdown[1]: Detaching loop devices. > [ 154.954583] kvm: exiting hardware virtualization > [ 154.999953] usb 5-2: USB disconnect, device number 2 > [ 155.025278] ohci-pci 0000:00:12.1: AMD-Vi: Event logged [IO_PAGE_FAULT > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.081360] ohci-pci 0000:00:12.1: AMD-Vi: Event logged [IO_PAGE_FAULT > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.136778] ohci-pci 0000:00:12.1: AMD-Vi: Event logged [IO_PAGE_FAULT > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.191772] ohci-pci 0000:00:12.1: AMD-Vi: Event logged [IO_PAGE_FAULT > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.247055] ohci-pci 0000:00:12.1: AMD-Vi: Event logged [IO_PAGE_FAULT > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.302614] ohci-pci 0000:00:12.1: AMD-Vi: Event logged [IO_PAGE_FAULT > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.358996] ohci-pci 0000:00:12.1: AMD-Vi: Event logged [IO_PAGE_FAULT > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.392155] usb 4-2: new full-speed USB device number 2 using ohci-pci > [ 155.413752] ohci-pci 0000:00:12.1: AMD-Vi: Event logged [IO_PAGE_FAULT > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.413762] ohci-pci 0000:00:12.1: AMD-Vi: Event logged [IO_PAGE_FAULT > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.560307] ohci-pci 0000:00:12.1: AMD-Vi: Event logged [IO_PAGE_FAULT > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.616039] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.1 > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.667843] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.1 > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.719497] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.1 > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.772697] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.1 > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.823919] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.1 > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.875490] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.1 > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.927258] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.1 > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 155.979318] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.1 > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 156.031813] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.1 > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 156.084293] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.1 > domain=0x0006 address=0x0000000000000080 flags=0x0020] > [ 156.272157] reboot: Restarting system > [ 156.290316] reboot: machine restart > > And, James bisected and spotted that it's introduced by the commit > 722e5f2b1eec ("driver core: Partially revert "driver core: correct > device's shutdown order""). Reverting the commit fixes the problem. > > He mentioned about Uncorrectable Machine Check Exception seen at > shutdown, too, where it doesn't appear after the revert. (Though, > it's not sure whether it's really relevant.) > > The errors are clearly related with the USB device (a KVM device, > IIRC), and the errors are not seen if the USB device is disconnected. > > We experienced this at first with SLE15 kernel (4.12 with backports), > but later the same issue was confirmed on 4.18.y and 4.19-rc2. Also, > it's confirmed that revert works on the upstream kernels, too. > > Does this hit your radar? Ugh, no, I haven't heard of this before, Rafael? So the need for the revert fixes some machines, but others need the patch, this isn't going to be fun :( greg k-h