** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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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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