> I have now seen for the second time a BUG() at usb.h:1074
> usb_dec_dev_use() called by
> uhci_free_qh() called by
> uhci_free_pending_qhs() called by
> uhci_interrupt() called by handle_IRQ_event().
>
> Since it is not easily reproducible, I have not attempted
> to trace what happens.
What USB drivers were running at the time?
This was 2.5.8, with
% grep USB .config | grep -v '#'
CONFIG_USB=y
CONFIG_USB_DEVICEFS=y
CONFIG_USB_UHCI_ALT=y
CONFIG_USB_HOST=y
CONFIG_USB_STORAGE=m
CONFIG_USB_STORAGE_DPCM=y
CONFIG_USB_STORAGE_SDDR09=y
CONFIG_USB_HID=y
CONFIG_USB_HIDINPUT=y
CONFIG_USB_WACOM=y
CONFIG_USB_INPUT=y
CONFIG_USB_INPUT=y
It was at boot time, the usb-storage module was not loaded.
Devices (now, after a reboot):
1. USB UHCI-alt Root Hub
2. hub 0451:1446
3. hub 0451:1446
4. keyboard / hidmouse 05e3:000a
3a. eUSB SmartMedia / CompactFlash Adapter 04e6:0005
with numbering and indentation showing the topology.
[Funny: 3a does not go away when it is disconnected: usbview
still shows it. Both hubs shown are the same device.]
[Funny: CONFIG_USB_INPUT=y is shown twice.]
Andries
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
B: Alloc=220/900 us (24%), #Int= 4, #Iso= 0
D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 0.00
S: Product=USB UHCI-alt Root Hub
S: SerialNumber=9000
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms
T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 6 Spd=12 MxCh= 4
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0451 ProdID=1446 Rev= 1.10
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 1 Ivl=255ms
T: Bus=01 Lev=02 Prnt=06 Port=02 Cnt=01 Dev#= 8 Spd=1.5 MxCh= 0
D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=05e3 ProdID=000a Rev= 0.00
C:* #Ifs= 3 Cfg#= 1 Atr=a0 MxPwr= 48mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=01 Driver=hid
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=8ms
I: If#= 1 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=hid
E: Ad=83(I) Atr=03(Int.) MxPS= 2 Ivl=8ms
I: If#= 2 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=hid
E: Ad=82(I) Atr=03(Int.) MxPS= 3 Ivl=8ms
T: Bus=01 Lev=02 Prnt=06 Port=03 Cnt=02 Dev#= 7 Spd=12 MxCh= 4
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0451 ProdID=1446 Rev= 1.10
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 1 Ivl=255ms
T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 3 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=16 #Cfgs= 1
P: Vendor=04e6 ProdID=0005 Rev= 2.07
S: Manufacturer=SCM Microsystems Inc.
S: Product=eUSB SmartMedia / CompactFlash Adapter
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=01 Prot=01 Driver=usb-storage
E: Ad=01(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms
E: Ad=82(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
E: Ad=83(I) Atr=03(Int.) MxPS= 2 Ivl=32ms
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