Red Hat Bugzilla – Bug 76184
NULL pointer dereference in aha152x_cs when acessing SCSI device
Last modified: 2015-01-04 17:02:01 EST
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2b) Gecko/20021015 Description of problem: At first I was not able to get my Adaptec 1460 PCMCIA SCSI card to work using the default Red Hat Linux 8.0 kernel (2.4.18-14). I would get the error "trying software interrupt, lost." when I inserted the card (see bug 67285 (https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=67285) for more information). Using Google, I found some information on the Linux Kernel Mailing List about this problem. Using the information at http://www.uwsg.iu.edu/hypermail/linux/kernel/0207.2/0209.html, I modified aha152x.c and rebuilt the kernel. Now I am able to insert the card and see the SCSI devices. However, when I try to access the devices, the commands coredump. I've tried using cdrecord to write some information to a CD-R, xsane to scan an image, and cp to copy a file from a CD. In each case, the command crashes after trying to read from or write to the SCSI device. It is interesting to note that I've been able to use ls to list files on a CD without any problem. After seeing this problem with both my CD-RW drive and scanner, I looked in /var/log/messages to see if there were any kernel errors. Each time, I found the message "Unable to handle kernel NULL pointer dereference at virtual address 00000034" followed by a stack trace. It looks like it is coming from the aha152x_cs driver, since I found this as well: EIP is at aha152x_internal_queue [aha152x_cs] 0x104 Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. Insert Adaptec 1460 card with CD-RW and scanner attached. 2. mount /dev/scd0 /mnt/cdrw 3. cp /mnt/cdrw/myfile /tmp Can also try getting a preview from the scanner using xsane, or writing some data to a CD-R using cdrecord. Actual Results: Get a segmentation fault from cp/xsane/cdrecord. Find stack trace /var/log/messages. Expected Results: The command should copy the file, scan the image, or write the data instead of segfaulting. Should not find stack trace in /var/log/messages. Additional info: Scanner is Epson Perfection 1200s, and CD-RW is an HP CD-Writer+ 9210 8x/4x/32x. Laptop is an HP Pavilion XH136. All of this hardware worked without any problems under Red Hat 7.1 and 7.2.
Created attachment 80864 [details] Stack traces from /var/log/messages and cdrecord output
Upgraded to kernel 2.4.18-17.8.0, and it fixed this problem. It looks like aha152x.c was changed quite a bit from 2.4.18-14. It also fixed the problem in bug 67285.