Hello, I have a linux-2.4.37 - kernel *HANG* hard lockup that I am trying to debug, ctl-alt-del does not fix the problem. The problem does not occur on current 2.6 kernels. Specifically the device I am talking to is an USB-ACM type 'scanner' type device, it shows up as a USB com port /dev/input/ttyACM0 - and I read/write commands to & from the device. Some fixes have already been back ported from 2.6 (trying to get it to run on 2.4.20-8 [rh9]) and I'm not getting far and asking for some help or some pointers where to go next. The bug is quite reproducible - I have a small C program, and a small shell script loop. It sends a few commands (ie: initialize, scan and transmit image) then saves the image to a file. Somewhere between 70 to 150 scans BANG a hard hang occurs, takes between 5 to 15 minutes. I get *NO* output on the console, like an oops or something like that. Only debug messages I have added in my program. I have already turned the USB KERNEL debug messages on in the .config file, and I have "dmesg -n 9". And - if I do add too many of my own debug messages, depending on the volume of messages the problem takes longer to appear or goes away (I give up after several hours) - which makes me think it is a timing/race condition :-( If this is the wrong list, or there is a better list for this specific 2.4/usb/acm problem please let me know, I don't really know where else to ask. Thanks. -Duane. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
