Hi, I have been hitting this bug regularly in the 2.6.20.x kernels:
http://bugzilla.kernel.org/show_bug.cgi?id=8198 What *seems* to be happening is that something (winecfg?) is causing the USB layer to allocate a new endpoint directory in /sys, and then quickly deallocate it again. However, sometimes the endpoint directory is deallocated while udevd is still browsing it, and this causes an oops. The endpoint directory shown in the oops report does not exist if I'm not thrashing the box with winecfg. On Tejun Heo's suggestion, I put some debug code at the beginning of sysfs_release() to print a stack-dump and the kobject's path if the attr->owner field contains 0x6b6b6b6b or 0x5a5a5a5a poison: XXX debug trap owner=6b6b6b6b, path=/class/usb_endpoint/usbdev1.3_ep84 XXX debug stack-dump [<c018462a>] sysfs_release+0x70/0xa5 [<c0151837>] __fput+0x96/0x13c [<c014f358>] filp_close+0x51/0x58 [<c0150351>] sys_close+0x70/0xa7 [<c0102bde>] sysenter_past_esp+0x5f/0x85 [<c0270033>] unix_create1+0xa2/0xee ======================= Does anyone have any idea what's happening, please? According to /proc/bus/usb/devices, this particular endpoint should only exist if we are using the Alt > 0 version of this USB device's interface: I: If#= 1 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=snd-usb-audio I: If#= 2 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio I: If#= 2 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio E: Ad=84(I) Atr=01(Isoc) MxPS= 90 Ivl=1ms I: If#= 2 Alt= 2 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio E: Ad=84(I) Atr=01(Isoc) MxPS= 46 Ivl=1ms I: If#= 2 Alt= 3 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio E: Ad=84(I) Atr=01(Isoc) MxPS= 25 Ivl=1ms I: If#= 2 Alt= 4 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio E: Ad=84(I) Atr=01(Isoc) MxPS= 16 Ivl=1ms Thanks for any help, Cheers, Chris ___________________________________________________________ Yahoo! Mail is the world's favourite email. Don't settle for less, sign up for your free account today http://uk.rd.yahoo.com/evt=44106/*http://uk.docs.yahoo.com/mail/winter07.html ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
