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Bug#805903: marked as done (linux-image-4.2.0-1-amd64: USB ExpressCard makes kworker process utilise 72% CPU infinitely)

Your message dated Fri, 22 Mar 2019 19:40:47 +0100
with message-id <b9b742ece267c375f758825a9ee570d9de118a28.camel@gmail.com>
and subject line Re: linux-image-4.2.0-1-amd64: USB ExpressCard makes kworker process utilise 72% CPU infinitely
has caused the Debian Bug report #805903,
regarding linux-image-4.2.0-1-amd64: USB ExpressCard makes kworker process utilise 72% CPU infinitely
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
805903: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=805903
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
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Package: src:linux
Version: 4.2.6-1
Severity: normal


Hey.

This is originall from http://article.gmane.org/gmane.linux.kernel/2090843:

I bough a USB3.0 ExpressCard from StarTech[0] which is apparently[1]
based on the NEC uPD720200.

Using a kernel 4.2.6 on amd64, the System is Debian sid, the following
happens when I plug the card:

kernel logs show:
Nov 21 17:15:22 heisenberg kernel: [  102.387452] pci 0000:01:00.0: [1033:0194] type 00 class 0x0c0330
Nov 21 17:15:22 heisenberg kernel: [  102.387545] pci 0000:01:00.0: reg 0x10: [mem
0x00000000-0x00001fff 64bit]
Nov 21 17:15:22 heisenberg kernel: [  102.387723] pci 0000:01:00.0: PME# supported from D0 D3hot
Nov 21 17:15:22 heisenberg kernel: [  102.394689] pci 0000:01:00.0: BAR 0: assigned [mem
0xf0d00000-0xf0d01fff 64bit]
Nov 21 17:15:22 heisenberg kernel: [  102.394750] pci 0000:01:00.0: enabling device (0000 -> 0002)
Nov 21 17:15:22 heisenberg kernel: [  102.395178] xhci_hcd 0000:01:00.0: xHCI Host Controller
Nov 21 17:15:22 heisenberg kernel: [  102.395192] xhci_hcd 0000:01:00.0: new USB bus registered,
assigned bus number 5
Nov 21 17:15:22 heisenberg kernel: [  102.395418] xhci_hcd 0000:01:00.0: hcc params 0x014042cb hci
version 0x96 quirks 0x00000004
Nov 21 17:15:22 heisenberg kernel: [  102.395892] usb usb5: New USB device found, idVendor=1d6b, idProduct=0002
Nov 21 17:15:22 heisenberg kernel: [  102.395896] usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1
Nov 21 17:15:22 heisenberg kernel: [  102.395899] usb usb5: Product: xHCI Host Controller
Nov 21 17:15:22 heisenberg kernel: [  102.395902] usb usb5: Manufacturer: Linux 4.2.0-1-amd64 xhci-hcd
Nov 21 17:15:22 heisenberg kernel: [  102.395905] usb usb5: SerialNumber: 0000:01:00.0
Nov 21 17:15:22 heisenberg kernel: [  102.396308] hub 5-0:1.0: USB hub found
Nov 21 17:15:22 heisenberg kernel: [  102.396331] hub 5-0:1.0: 2 ports detected
Nov 21 17:15:22 heisenberg kernel: [  102.396591] xhci_hcd 0000:01:00.0: xHCI Host Controller
Nov 21 17:15:22 heisenberg kernel: [  102.396599] xhci_hcd 0000:01:00.0: new USB bus registered,
assigned bus number 6
Nov 21 17:15:22 heisenberg kernel: [  102.398835] usb usb6: We don't know the algorithms for LPM for
this host, disabling LPM.
Nov 21 17:15:22 heisenberg kernel: [  102.398883] usb usb6: New USB device found, idVendor=1d6b, idProduct=0003
Nov 21 17:15:22 heisenberg kernel: [  102.398887] usb usb6: New USB device strings: Mfr=3, Product=2, SerialNumber=1
Nov 21 17:15:22 heisenberg kernel: [  102.398890] usb usb6: Product: xHCI Host Controller
Nov 21 17:15:22 heisenberg kernel: [  102.398892] usb usb6: Manufacturer: Linux 4.2.0-1-amd64 xhci-hcd
Nov 21 17:15:22 heisenberg kernel: [  102.398895] usb usb6: SerialNumber: 0000:01:00.0
Nov 21 17:15:22 heisenberg kernel: [  102.399272] hub 6-0:1.0: USB hub found
Nov 21 17:15:22 heisenberg kernel: [  102.399294] hub 6-0:1.0: 2 ports detected

and when removing:
Nov 21 17:15:40 heisenberg kernel: [  120.541515] xhci_hcd 0000:01:00.0: remove, state 4
Nov 21 17:15:40 heisenberg kernel: [  120.544671] usb usb6: USB disconnect, device number 1
Nov 21 17:15:40 heisenberg kernel: [  120.546683] xhci_hcd 0000:01:00.0: Host not halted after 16000 microseconds.
Nov 21 17:15:40 heisenberg kernel: [  120.547611] xhci_hcd 0000:01:00.0: USB bus 6 deregistered
Nov 21 17:15:40 heisenberg kernel: [  120.547618] xhci_hcd 0000:01:00.0: remove, state 4
Nov 21 17:15:40 heisenberg kernel: [  120.547622] usb usb5: USB disconnect, device number 1
Nov 21 17:15:40 heisenberg kernel: [  120.547735] xhci_hcd 0000:01:00.0: USB bus 5 deregistered

Now the problem is that immediately when I attach the card, a kworker
process starts to utilise the CPU to always around 72%.
And it never stops again until I shutdown; removing the card doesn't
help.

Any ideas?

Thanks,
Chris.

[0] http://www.startech.com/Cards-Adapters/USB-3.0/Cards/2-Port-Flush-Mount-USB-3-ExpressCard-Adapter~ECUSB3S254F
[1] http://sgcdn.startech.com/005329/media/sets/ECUSB3S254F_Manual/ECUSB3S254F.pdf

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