Public bug reported:
This is a somewhat complex problem and seems to be the combination of
two separate bugs, one present in 12.04 (kernel 3.2.0-32-generic) and
another new in 12.10 (kernel 3.5.0-17-generic). The problem is seen
when unplugging an Encore Electronics ENPUH-302 ExpressCard-to-USB
adaptor, with a generic USB thumb drive attached, from a 64-bit Intel
Atom system.
On 12.04, I see this message logged 20 seconds after removing the card:
"xhci_hcd 0000:0b:00.0: Timeout while waiting for configure endpoint
command". If I plug the card in again during that 20 seconds, it is not
recognized (dmesg says only "pciehp 0000:00:1c.3:pcie04: Card present on
Slot(35)").
On 12.10, the problem is worse. The same message ("Timeout while
waiting ...") is logged 20 seconds after removing the card. If I plug
the card in again during that 20 seconds, I see an additional message
that was not printed in 12.04: "pciehp 0000:00:1c.3:pcie04: >Device
0000:0b:00.0 already exists at 0000:0b:00, cannot hot-add". If I then
unplug the card, the kernel dumps a crash report (a page fault triggered
by pci_stop_bus_device()) to the screen and the system freezes.
Attached are the following logs:
12.04/dmesg-boot.log: dmesg output when booting system with (Ubuntu 12.04)
12.04/dmesg-insert.log: dmesg output when plugging ExpressCard in-out-in-out
(Ubuntu 12.04)
12.04/lspci-out.log: "lspci -tv" output without ExpressCard inserted (Ubuntu
12.04)
12.04/lspci-in.log: "lspci -tv" output with ExpressCard inserted (Ubuntu 12.04)
12.10/dmesg-boot.log: dmesg output when booting system with (Ubuntu 12.10)
12.10/dmesg-insert.log: dmesg output when plugging ExpressCard in-out-in
(Ubuntu 12.10)
12.10/lspci-out.log: "lspci -tv" output without ExpressCard inserted (Ubuntu
12.10)
12.10/lspci-in.log: "lspci -tv" output with ExpressCard inserted (Ubuntu 12.10)
12.10/kernel-dump.png: snapshot of monitor showing kernel crash dump (Ubuntu
12.10)
The testing system is the following Kontron COM on a custom board:
http://us.kontron.com/products/computeronmodules/com+express/com+express+compact/comecpv2.html
Let me know if you need any more info.
John Lindgren
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: precise
** Attachment added: "Logs"
https://bugs.launchpad.net/bugs/1073688/+attachment/3420011/+files/kernel-logs.tar.gz
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https://bugs.launchpad.net/bugs/1073688
Title:
Kernel crash when unplugging ExpressCard-to-USB adaptor
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