I have a D-Link DWA-140 USB Wi-Fi device which is rt2800 based (5392 chipset). I've been testing it on a BeagleBone Black running an Ubuntu 16.04 image (4.4.6 kernel), with a USB hub.
When I unplug the Wi-Fi device from the USB hub, and it's connected to an access point, and then I unplug it, the OS appears to lock up. I get messages about a soft lockup on the serial console:
[ 9736.136702] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u2:0:1129]
[ 9764.136701] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u2:0:1129]
[ 9792.136701] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u2:0:1129]
[ 9820.136699] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u2:0:1129]
[ 9848.136696] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u2:0:1129]
This will repeat indefinitely, until I unplug the hub, which resolves the soft lockup and then the system seems to function normally.
I've attached a dmesg log of the soft lockup stack traces. They seem to indicate a lockup in workqueue rt2x00usb_work_rxdone() (specifically in usb_hcd_submit_urb() called from rt2x00usb_kick_rx_entry() called from rt2x00usb_clear_entry()).
I originally found this bug on a 3.14.x kernel built with Yocto for a BeagleBone Black-based product. So it seems this is a bug that has been around for some time.
--
Craig McQueen
On Tue, May 10, 2016 at 9:17 AM, Craig McQueen
<[email protected]> wrote:
> Yegor Yefremov wrote:
>> Hi Craig,
>>
>> On Tue, May 10, 2016 at 8:08 AM, Craig McQueen
>> <[email protected]> wrote:
>> > I previously wrote:
>> >> I previously wrote:
>> >> > I previously wrote:
>> >> > >
>> >> > > I have a D-Link DWA-140 USB Wi-Fi device which is rt2800 based
>> >> > > (5392 chipset). I've been testing it on a BeagleBone Black
>> >> > > running an Ubuntu
>> >> > > 16.04 image (4.4.6 kernel), with a USB hub.
>> >> > >
>> >> > > When I unplug the Wi-Fi device from the USB hub, and it's
>> >> > > connected to an access point, and then I unplug it, the OS appears to
>> lock up.
>> >> > > I get messages about a soft lockup on the serial console:
>> >> > >
>> >> > > [ 9736.136702] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s!
>> >> > > [kworker/u2:0:1129] [ 9764.136701] NMI watchdog: BUG: soft lockup
>> >> > > -
>> >> > > CPU#0 stuck for 22s! [kworker/u2:0:1129] [ 9792.136701] NMI
>> watchdog:
>> >> > > BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u2:0:1129] [
>> >> > > 9820.136699] NMI
>> >> > > watchdog: BUG: soft lockup - CPU#0 stuck for 22s!
>> >> > > [kworker/u2:0:1129] [ 9848.136696] NMI watchdog: BUG: soft lockup
>> >> > > -
>> >> CPU#0 stuck for 22s!
>> >> > > [kworker/u2:0:1129]
>> >> > >
>> >> > > This will repeat indefinitely, until I unplug the hub, which
>> >> > > resolves the soft lockup and then the system seems to function
>> normally.
>> >> > >
>> >> > > I've attached a dmesg log of the soft lockup stack traces. They
>> >> > > seem to indicate a lockup in workqueue rt2x00usb_work_rxdone()
>> >> > > (specifically in
>> >> > > usb_hcd_submit_urb() called from rt2x00usb_kick_rx_entry() called
>> >> > > from rt2x00usb_clear_entry()).
>> >> > >
>> >> > > I originally found this bug on a 3.14.x kernel built with Yocto
>> >> > > for a BeagleBone Black-based product. So it seems this is a bug
>> >> > > that has been around for some time.
>> >> >
>> >> > I should also note that on the 3.14.x Yocto-built kernel on
>> >> > BeagleBone Black, this bug does not occur if the rt2800 device is
>> >> > unplugged directly from the BBB's USB port. It only occurs if unplugged
>> from a hub.
>> >> >
>> >> > I have tested this on an i586 based eBox-3310A mini-PC running
>> >> > Debian 8.4, which has a 3.16.0 kernel, with the same hub and same
>> >> > rt2800 device. But I was not able to reproduce this issue.
>> >>
>> >> There is a patch for the AM335x musb driver that seems to fix this:
>> >>
>> >> http://marc.info/?l=linux-usb&m=146173995117456&w=2
>> >>
>> >> So it seems that this issue's root cause is in the AM335x USB
>> >> interrupt handling, and not the Wi-Fi rt2800 driver.
>> >
>> > Having applied two AM335x USB patches in the 3.14.49 kernel, that does
>> seem to resolve the soft lock-up on the RX side. The two patches are:
>> >
>> > http://marc.info/?l=linux-usb&m=146173995117456&w=2
>> > http://marc.info/?l=linux-usb&m=146222355213935&w=2
>> >
>> > But I am finding there is still a lock-up issue when unplugging from a hub,
>> this time on the TX side. It is more likely if there is Wi-Fi traffic in progress
>> when the unplug occurs. I'm attaching a log. Essentially there are a heap of
>> lines (100 or so per second):
>> >
>> > [ 1866.693511] ieee80211 phy7: rt2800usb_tx_sta_fifo_read_completed:
>> > Warning - TX status read failed -71
>> >
>> > Which finally stop shortly after USB disconnect is detected:
>> >
>> > [ 1866.985854] usb 1-1.3: USB disconnect, device number 10
>> >
>> > However that disconnect message is typically 30-90 seconds after the
>> unplug happened. It seems that the USB disconnect detection is delayed due
>> to the CPU load of the TX.
>> >
>> > I also sometimes see a kernel panic. That can occur whether connected to a
>> USB hub or directly to the on-board USB port. See the attached log.
>> >
>> > I'm not so familiar with either the Wi-Fi or USB stacks in the Linux
>> > kernel, so I would appreciate any advice with debugging and fixing
>> > this. (My previous investigations indicate these issues are present in
>> > both 3.14.x kernel and 4.4.6 kernel. I'm more familiar with working
>> > with the 3.14.x kernel under Yocto, but I could try moving to 4.4.6
>> > kernel for Ubuntu. I'm open to advice on which to investigate on.)
>>
>> Take a look at this patch: http://marc.info/?l=linux-
>> usb&m=146222355213935&w=2
>>
>> If it fixes your issue please provide your "tested-by" tag here.
>
> Hi Yegor,
>
> I am using that patch, and I referred to it in my last message. But it doesn't fix this issue.
Have missed that.
I've made following test with am335x based device and a Ralink
Technology, Corp. RT5370 Wireless Adapter attached vie USB hub:
root@baltos:~# lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=musb-hdrc/1p, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=musb-hdrc/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 1: Dev 4, If 0, Class=Vendor Specific Class,
Driver=rt2800usb, 480M
during nuttcp test session I unplug WLAN dongle and get following
kernel messages (kernel 3.18.32 with [1])
ieee80211 phy2: rt2800usb_tx_sta_fifo_read_completed: Warning - TX
status read failed -71
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
ieee80211 phy2: rt2x00usb_vendor_request: Error - Vendor Request 0x07
failed for offset 0x1700 with error -110
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
hub 1-1:1.0: hub_port_status failed (err = -110)
ieee80211 phy2: rt2x00usb_vendor_request: Error - Vendor Request 0x07
failed for offset 0x0438 with error -110
hub 1-1:1.0: hub_port_status failed (err = -110)
[1] http://marc.info/?l=linux-usb&m=146222355213935&w=2
Yegor
I previously wrote:
> I previously wrote:
> > I previously wrote:
> > >
> > > I have a D-Link DWA-140 USB Wi-Fi device which is rt2800 based (5392
> > > chipset). I've been testing it on a BeagleBone Black running an
> > > Ubuntu
> > > 16.04 image (4.4.6 kernel), with a USB hub.
> > >
> > > When I unplug the Wi-Fi device from the USB hub, and it's connected
> > > to an access point, and then I unplug it, the OS appears to lock up.
> > > I get messages about a soft lockup on the serial console:
> > >
> > > [ 9736.136702] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s!
> > > [kworker/u2:0:1129] [ 9764.136701] NMI watchdog: BUG: soft lockup -
> > > CPU#0 stuck for 22s! [kworker/u2:0:1129] [ 9792.136701] NMI watchdog:
> > > BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u2:0:1129] [
> > > 9820.136699] NMI
> > > watchdog: BUG: soft lockup - CPU#0 stuck for 22s!
> > > [kworker/u2:0:1129] [ 9848.136696] NMI watchdog: BUG: soft lockup -
> CPU#0 stuck for 22s!
> > > [kworker/u2:0:1129]
> > >
> > > This will repeat indefinitely, until I unplug the hub, which
> > > resolves the soft lockup and then the system seems to function normally.
> > >
> > > I've attached a dmesg log of the soft lockup stack traces. They seem
> > > to indicate a lockup in workqueue rt2x00usb_work_rxdone()
> > > (specifically in
> > > usb_hcd_submit_urb() called from rt2x00usb_kick_rx_entry() called
> > > from rt2x00usb_clear_entry()).
> > >
> > > I originally found this bug on a 3.14.x kernel built with Yocto for
> > > a BeagleBone Black-based product. So it seems this is a bug that has
> > > been around for some time.
> >
> > I should also note that on the 3.14.x Yocto-built kernel on BeagleBone
> > Black, this bug does not occur if the rt2800 device is unplugged
> > directly from the BBB's USB port. It only occurs if unplugged from a hub.
> >
> > I have tested this on an i586 based eBox-3310A mini-PC running Debian
> > 8.4, which has a 3.16.0 kernel, with the same hub and same rt2800
> > device. But I was not able to reproduce this issue.
>
> There is a patch for the AM335x musb driver that seems to fix this:
>
> http://marc.info/?l=linux-usb&m=146173995117456&w=2
>
> So it seems that this issue's root cause is in the AM335x USB interrupt
> handling, and not the Wi-Fi rt2800 driver.
Having applied two AM335x USB patches in the 3.14.49 kernel, that does seem to resolve the soft lock-up on the RX side. The two patches are:
http://marc.info/?l=linux-usb&m=146173995117456&w=2
http://marc.info/?l=linux-usb&m=146222355213935&w=2
But I am finding there is still a lock-up issue when unplugging from a hub, this time on the TX side. It is more likely if there is Wi-Fi traffic in progress when the unplug occurs. I'm attaching a log. Essentially there are a heap of lines (100 or so per second):
[ 1866.693511] ieee80211 phy7: rt2800usb_tx_sta_fifo_read_completed: Warning - TX status read failed -71
Which finally stop shortly after USB disconnect is detected:
[ 1866.985854] usb 1-1.3: USB disconnect, device number 10
However that disconnect message is typically 30-90 seconds after the unplug happened. It seems that the USB disconnect detection is delayed due to the CPU load of the TX.
I also sometimes see a kernel panic. That can occur whether connected to a USB hub or directly to the on-board USB port. See the attached log.
I'm not so familiar with either the Wi-Fi or USB stacks in the Linux kernel, so I would appreciate any advice with debugging and fixing this. (My previous investigations indicate these issues are present in both 3.14.x kernel and 4.4.6 kernel. I'm more familiar with working with the 3.14.x kernel under Yocto, but I could try moving to 4.4.6 kernel for Ubuntu. I'm open to advice on which to investigate on.)
--
Craig McQueen
I previously wrote:
> I previously wrote:
> >
> > I have a D-Link DWA-140 USB Wi-Fi device which is rt2800 based (5392
> > chipset). I've been testing it on a BeagleBone Black running an Ubuntu
> > 16.04 image (4.4.6 kernel), with a USB hub.
> >
> > When I unplug the Wi-Fi device from the USB hub, and it's connected to
> > an access point, and then I unplug it, the OS appears to lock up. I
> > get messages about a soft lockup on the serial console:
> >
> > [ 9736.136702] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s!
> > [kworker/u2:0:1129] [ 9764.136701] NMI watchdog: BUG: soft lockup -
> > CPU#0 stuck for 22s! [kworker/u2:0:1129] [ 9792.136701] NMI watchdog:
> > BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u2:0:1129] [
> > 9820.136699] NMI
> > watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u2:0:1129]
> > [ 9848.136696] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s!
> > [kworker/u2:0:1129]
> >
> > This will repeat indefinitely, until I unplug the hub, which resolves
> > the soft lockup and then the system seems to function normally.
> >
> > I've attached a dmesg log of the soft lockup stack traces. They seem
> > to indicate a lockup in workqueue rt2x00usb_work_rxdone()
> > (specifically in
> > usb_hcd_submit_urb() called from rt2x00usb_kick_rx_entry() called from
> > rt2x00usb_clear_entry()).
> >
> > I originally found this bug on a 3.14.x kernel built with Yocto for a
> > BeagleBone Black-based product. So it seems this is a bug that has
> > been around for some time.
>
> I should also note that on the 3.14.x Yocto-built kernel on BeagleBone Black,
> this bug does not occur if the rt2800 device is unplugged directly from the
> BBB's USB port. It only occurs if unplugged from a hub.
>
> I have tested this on an i586 based eBox-3310A mini-PC running Debian 8.4,
> which has a 3.16.0 kernel, with the same hub and same rt2800 device. But I
> was not able to reproduce this issue.
There is a patch for the AM335x musb driver that seems to fix this:
http://marc.info/?l=linux-usb&m=146173995117456&w=2
So it seems that this issue's root cause is in the AM335x USB interrupt handling, and not the Wi-Fi rt2800 driver.
--
Craig McQueen
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ZW4NCg0K
On Tue, May 10, 2016 at 9:43 AM, Yegor Yefremov
<[email protected]> wrote:
> On Tue, May 10, 2016 at 9:17 AM, Craig McQueen
> <[email protected]> wrote:
>> Yegor Yefremov wrote:
>>> Hi Craig,
>>>
>>> On Tue, May 10, 2016 at 8:08 AM, Craig McQueen
>>> <[email protected]> wrote:
>>> > I previously wrote:
>>> >> I previously wrote:
>>> >> > I previously wrote:
>>> >> > >
>>> >> > > I have a D-Link DWA-140 USB Wi-Fi device which is rt2800 based
>>> >> > > (5392 chipset). I've been testing it on a BeagleBone Black
>>> >> > > running an Ubuntu
>>> >> > > 16.04 image (4.4.6 kernel), with a USB hub.
>>> >> > >
>>> >> > > When I unplug the Wi-Fi device from the USB hub, and it's
>>> >> > > connected to an access point, and then I unplug it, the OS appears to
>>> lock up.
>>> >> > > I get messages about a soft lockup on the serial console:
>>> >> > >
>>> >> > > [ 9736.136702] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s!
>>> >> > > [kworker/u2:0:1129] [ 9764.136701] NMI watchdog: BUG: soft lockup
>>> >> > > -
>>> >> > > CPU#0 stuck for 22s! [kworker/u2:0:1129] [ 9792.136701] NMI
>>> watchdog:
>>> >> > > BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u2:0:1129] [
>>> >> > > 9820.136699] NMI
>>> >> > > watchdog: BUG: soft lockup - CPU#0 stuck for 22s!
>>> >> > > [kworker/u2:0:1129] [ 9848.136696] NMI watchdog: BUG: soft lockup
>>> >> > > -
>>> >> CPU#0 stuck for 22s!
>>> >> > > [kworker/u2:0:1129]
>>> >> > >
>>> >> > > This will repeat indefinitely, until I unplug the hub, which
>>> >> > > resolves the soft lockup and then the system seems to function
>>> normally.
>>> >> > >
>>> >> > > I've attached a dmesg log of the soft lockup stack traces. They
>>> >> > > seem to indicate a lockup in workqueue rt2x00usb_work_rxdone()
>>> >> > > (specifically in
>>> >> > > usb_hcd_submit_urb() called from rt2x00usb_kick_rx_entry() called
>>> >> > > from rt2x00usb_clear_entry()).
>>> >> > >
>>> >> > > I originally found this bug on a 3.14.x kernel built with Yocto
>>> >> > > for a BeagleBone Black-based product. So it seems this is a bug
>>> >> > > that has been around for some time.
>>> >> >
>>> >> > I should also note that on the 3.14.x Yocto-built kernel on
>>> >> > BeagleBone Black, this bug does not occur if the rt2800 device is
>>> >> > unplugged directly from the BBB's USB port. It only occurs if unplugged
>>> from a hub.
>>> >> >
>>> >> > I have tested this on an i586 based eBox-3310A mini-PC running
>>> >> > Debian 8.4, which has a 3.16.0 kernel, with the same hub and same
>>> >> > rt2800 device. But I was not able to reproduce this issue.
>>> >>
>>> >> There is a patch for the AM335x musb driver that seems to fix this:
>>> >>
>>> >> http://marc.info/?l=linux-usb&m=146173995117456&w=2
>>> >>
>>> >> So it seems that this issue's root cause is in the AM335x USB
>>> >> interrupt handling, and not the Wi-Fi rt2800 driver.
>>> >
>>> > Having applied two AM335x USB patches in the 3.14.49 kernel, that does
>>> seem to resolve the soft lock-up on the RX side. The two patches are:
>>> >
>>> > http://marc.info/?l=linux-usb&m=146173995117456&w=2
>>> > http://marc.info/?l=linux-usb&m=146222355213935&w=2
>>> >
>>> > But I am finding there is still a lock-up issue when unplugging from a hub,
>>> this time on the TX side. It is more likely if there is Wi-Fi traffic in progress
>>> when the unplug occurs. I'm attaching a log. Essentially there are a heap of
>>> lines (100 or so per second):
>>> >
>>> > [ 1866.693511] ieee80211 phy7: rt2800usb_tx_sta_fifo_read_completed:
>>> > Warning - TX status read failed -71
>>> >
>>> > Which finally stop shortly after USB disconnect is detected:
>>> >
>>> > [ 1866.985854] usb 1-1.3: USB disconnect, device number 10
>>> >
>>> > However that disconnect message is typically 30-90 seconds after the
>>> unplug happened. It seems that the USB disconnect detection is delayed due
>>> to the CPU load of the TX.
>>> >
>>> > I also sometimes see a kernel panic. That can occur whether connected to a
>>> USB hub or directly to the on-board USB port. See the attached log.
>>> >
>>> > I'm not so familiar with either the Wi-Fi or USB stacks in the Linux
>>> > kernel, so I would appreciate any advice with debugging and fixing
>>> > this. (My previous investigations indicate these issues are present in
>>> > both 3.14.x kernel and 4.4.6 kernel. I'm more familiar with working
>>> > with the 3.14.x kernel under Yocto, but I could try moving to 4.4.6
>>> > kernel for Ubuntu. I'm open to advice on which to investigate on.)
>>>
>>> Take a look at this patch: http://marc.info/?l=linux-
>>> usb&m=146222355213935&w=2
>>>
>>> If it fixes your issue please provide your "tested-by" tag here.
>>
>> Hi Yegor,
>>
>> I am using that patch, and I referred to it in my last message. But it doesn't fix this issue.
>
> Have missed that.
>
> I've made following test with am335x based device and a Ralink
> Technology, Corp. RT5370 Wireless Adapter attached vie USB hub:
>
> root@baltos:~# lsusb -t
> /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=musb-hdrc/1p, 480M
> /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=musb-hdrc/1p, 480M
> |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
> |__ Port 1: Dev 4, If 0, Class=Vendor Specific Class,
> Driver=rt2800usb, 480M
>
> during nuttcp test session I unplug WLAN dongle and get following
> kernel messages (kernel 3.18.32 with [1])
>
> ieee80211 phy2: rt2800usb_tx_sta_fifo_read_completed: Warning - TX
> status read failed -71
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> ieee80211 phy2: rt2x00usb_vendor_request: Error - Vendor Request 0x07
> failed for offset 0x1700 with error -110
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> hub 1-1:1.0: hub_port_status failed (err = -110)
> ieee80211 phy2: rt2x00usb_vendor_request: Error - Vendor Request 0x07
> failed for offset 0x0438 with error -110
> hub 1-1:1.0: hub_port_status failed (err = -110)
>
> [1] http://marc.info/?l=linux-usb&m=146222355213935&w=2
With 4.6.0-rc7 I get
[ 479.869736] ieee80211 phy1: rt2800usb_tx_sta_fifo_read_completed:
Warning - TX status read failed -71
[ 480.106022] ieee80211 phy1: rt2x00usb_vendor_request: Error -
Vendor Request 0x07 failed for offset 0x1700 with error -110
[ 480.216002] ieee80211 phy1: rt2x00usb_vendor_request: Error -
Vendor Request 0x07 failed for offset 0x7010 with error -110
[ 480.325996] ieee80211 phy1: rt2x00usb_vendor_request: Error -
Vendor Request 0x06 failed for offset 0x7010 with error -110
[ 480.436160] ieee80211 phy1: rt2x00usb_vendor_request: Error -
Vendor Request 0x06 failed for offset 0x0404 with error -110
[ 480.546178] ieee80211 phy1: rt2x00usb_vendor_request: Error -
Vendor Request 0x07 failed for offset 0x0438 with error -110
[ 96.726198] hub 1-1:1.0: hub_ext_port_status failed (err = -110)
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DQoNCg==
Hi Craig,
On Tue, May 10, 2016 at 8:08 AM, Craig McQueen
<[email protected]> wrote:
> I previously wrote:
>> I previously wrote:
>> > I previously wrote:
>> > >
>> > > I have a D-Link DWA-140 USB Wi-Fi device which is rt2800 based (5392
>> > > chipset). I've been testing it on a BeagleBone Black running an
>> > > Ubuntu
>> > > 16.04 image (4.4.6 kernel), with a USB hub.
>> > >
>> > > When I unplug the Wi-Fi device from the USB hub, and it's connected
>> > > to an access point, and then I unplug it, the OS appears to lock up.
>> > > I get messages about a soft lockup on the serial console:
>> > >
>> > > [ 9736.136702] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s!
>> > > [kworker/u2:0:1129] [ 9764.136701] NMI watchdog: BUG: soft lockup -
>> > > CPU#0 stuck for 22s! [kworker/u2:0:1129] [ 9792.136701] NMI watchdog:
>> > > BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u2:0:1129] [
>> > > 9820.136699] NMI
>> > > watchdog: BUG: soft lockup - CPU#0 stuck for 22s!
>> > > [kworker/u2:0:1129] [ 9848.136696] NMI watchdog: BUG: soft lockup -
>> CPU#0 stuck for 22s!
>> > > [kworker/u2:0:1129]
>> > >
>> > > This will repeat indefinitely, until I unplug the hub, which
>> > > resolves the soft lockup and then the system seems to function normally.
>> > >
>> > > I've attached a dmesg log of the soft lockup stack traces. They seem
>> > > to indicate a lockup in workqueue rt2x00usb_work_rxdone()
>> > > (specifically in
>> > > usb_hcd_submit_urb() called from rt2x00usb_kick_rx_entry() called
>> > > from rt2x00usb_clear_entry()).
>> > >
>> > > I originally found this bug on a 3.14.x kernel built with Yocto for
>> > > a BeagleBone Black-based product. So it seems this is a bug that has
>> > > been around for some time.
>> >
>> > I should also note that on the 3.14.x Yocto-built kernel on BeagleBone
>> > Black, this bug does not occur if the rt2800 device is unplugged
>> > directly from the BBB's USB port. It only occurs if unplugged from a hub.
>> >
>> > I have tested this on an i586 based eBox-3310A mini-PC running Debian
>> > 8.4, which has a 3.16.0 kernel, with the same hub and same rt2800
>> > device. But I was not able to reproduce this issue.
>>
>> There is a patch for the AM335x musb driver that seems to fix this:
>>
>> http://marc.info/?l=linux-usb&m=146173995117456&w=2
>>
>> So it seems that this issue's root cause is in the AM335x USB interrupt
>> handling, and not the Wi-Fi rt2800 driver.
>
> Having applied two AM335x USB patches in the 3.14.49 kernel, that does seem to resolve the soft lock-up on the RX side. The two patches are:
>
> http://marc.info/?l=linux-usb&m=146173995117456&w=2
> http://marc.info/?l=linux-usb&m=146222355213935&w=2
>
> But I am finding there is still a lock-up issue when unplugging from a hub, this time on the TX side. It is more likely if there is Wi-Fi traffic in progress when the unplug occurs. I'm attaching a log. Essentially there are a heap of lines (100 or so per second):
>
> [ 1866.693511] ieee80211 phy7: rt2800usb_tx_sta_fifo_read_completed: Warning - TX status read failed -71
>
> Which finally stop shortly after USB disconnect is detected:
>
> [ 1866.985854] usb 1-1.3: USB disconnect, device number 10
>
> However that disconnect message is typically 30-90 seconds after the unplug happened. It seems that the USB disconnect detection is delayed due to the CPU load of the TX.
>
> I also sometimes see a kernel panic. That can occur whether connected to a USB hub or directly to the on-board USB port. See the attached log.
>
> I'm not so familiar with either the Wi-Fi or USB stacks in the Linux kernel, so I would appreciate any advice with debugging and fixing this. (My previous investigations indicate these issues are present in both 3.14.x kernel and 4.4.6 kernel. I'm more familiar with working with the 3.14.x kernel under Yocto, but I could try moving to 4.4.6 kernel for Ubuntu. I'm open to advice on which to investigate on.)
Take a look at this patch: http://marc.info/?l=linux-usb&m=146222355213935&w=2
If it fixes your issue please provide your "tested-by" tag here.
Yegor