I've re-run zsync for latest image; no 'ehci-pci' messages on either
dc7700 or 755 for Xubuntu x86  (but both drop to BusyBox/initramfs)

Given different messages - I reported as a different bug (for QA tracker)
http://launchpad.net/bugs/1795092
providing link to here of course; inc. your upstream possible link..
(I am yet to try lubuntu image today)

-- hp dc7700 (c2d, 5gb ram, nvidia quadro nvs290/g86)
guiverc@dc7700ub:~$ lscpi|grep HCI
00:1a.0 USB controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #4 (rev 02)
00:1a.1 USB controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #5 (rev 02)
00:1a.7 USB controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI 
Controller #2 (rev 02)
00:1d.0 USB controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #1 (rev 02)
00:1d.1 USB controller: Intel Corporation 82801H (ICH8 Family) USB UHCI 
Controller #2 (rev 02)
00:1d.7 USB controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI 
Controller #1 (rev 02)

-- dell 755 (c2d, 5gb ram, rv516/x1300/x1550 radeon)
755-suse:/home/guiverc # lspci |grep HCI
00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #4 (rev 02)
00:1a.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #5 (rev 02)
00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI 
Controller #2 (rev 02)
00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #1 (rev 02)
00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #2 (rev 02)
00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #3 (rev 02)
00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI 
Controller #1 (rev 02)
00:1f.2 SATA controller: Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 6 port 
SATA Controller [AHCI mode] (rev 02)

Sorry Walter, I'm lost with the following

> It also might be good to check a 32 bit kernel on a 64 bit machine if you can 
> get 
> that test out of the way
> If it's possible, checking all those different ones will likely prove helping 
> in
> understanding the scope of the problem.

-- 
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

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