Sorry Walter, I should have updated with info from https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795092
the xubuntu 18.10 x86 has the same (or very similar) messages, but they stop far sooner, and xubuntu drops to busybox/initramfs with an error. I was asked by jsalisbury to do a test; which I think proves the kernel is okay. >From #1795092 bug comment #13 follows ---------------- installed lubuntu 18.04.1 on dell 755 without updates, format of /, but used my old /home (from fedora). rebooted post install, pointed sources to my ISP's ubuntu mirror (bandwidth free updates) & dist-upgrade. I added xubuntu-desktop & some of the apps missing from my modified xfce desktop. added canonical kernel ppa; changed [ppa] source to point to cosmic; update & install kernel. reboot & login (normally!) guiverc@755-lubu:~$ screenfetch -n guiverc@755-lubu OS: Ubuntu 18.04 bionic Kernel: x86_64 Linux 4.18.0-8-generic Uptime: 10m Packages: 1678 Shell: bash 4.4.19 Resolution: 1680x1050 DE: XFCE WM: Xfwm4 WM Theme: Agualemon GTK Theme: Mist [GTK2] Icon Theme: gnome Font: Sans 10 CPU: Intel Core2 Duo E6850 @ 2x 2.71GHz GPU: ATI RV515 RAM: 477MiB / 4824MiB // in #14 from same bug report I booted xubuntu 18.10 (x86) live on same dell 755; it still has [ 99.999999] ehci-pci 0000:00:1a.7:dma_direct_map_sg: overflow 0x000000016cbe60000+2048 of device mask ffffffff -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1794922 Title: lubuntu 18.10 x86 (32bit) image fails to load "ehci-pci 0000:00:a.7: dma_direct_map_sg: overflow 0x000000016e3f3000+2048 of device mask ffffffff" repeats Status in linux package in Ubuntu: Confirmed Status in linux package in Debian: Unknown Bug description: -- Background -- Testing the x86 (32bit) ISO image on various machines. After zsync download, the thumb-drive is tested ("check disk for defects") & passes; and worked fine on two systems today (dell d610 & hp dx6120), however -- Issue -- dell 755 (desktop) & hp dc7700 (small form factor) it just sits at lubuntu plymouth screen. switching to messages, it's just the following repeating // on dell 755 "ehci-pci 0000:00:1a.7: dma_direct_map_sg: overflow 0x000000016e3f3000+2048 of device mask ffffffff" // on hp dc7700 "ehci-pci 0000:00:1a.7: dma_direct_map_sg: overflow 0x0000000162317000+2048 of device mask ffffffff" NOTE: I can't copy/paste from systems, as it never completes boot; I left it >30mins (on 755) & it just kept repeating message. I've manually typed it; so typo's could have been made. A discussion on #lubuntu-devel provided a possible cause (Thank you Walter!) - --- <wxl> guiverc: lyorian: http://debian.2.n7.nabble.com/Bug-908924-dma-direct-map-sg-overflow-on-USB-access-after-upgrade-to-kernel-4-18-td4387757.html <wxl> seems like it's a usb issue of some kind with 4.18 --- This fits because whilst I do my testing mostly on d610 & t43 (no issues today), I'd tested Lubuntu 18.10 before on the dell 755 with no issues. My last test was also long enough ago to be on 4.17 kernel. I'll add `lshw` files for the two failed systems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1794922/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
