From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20020830 Description of problem: When using the /proc/scsi/scsi interface to do continous hot add and remove on 3 Western Digital SATA disk attached to a 3ware 8506 card on a dual hyperthreaded Xeon system with 1G of ram the system will lock up. Sometimes it will do it after 10 minutes sometimes it may take 3 or 4 hours. Here is an example of commands I'm talking about. echo "scsi remove-single-device 3 0 1 0" > /proc/scsi/scsi echo "scsi remove-single-device 3 0 5 0" > /proc/scsi/scsi echo "scsi remove-single-device 3 0 7 0" > /proc/scsi/scsi echo "scsi add-single-device 3 0 1 0" > /proc/scsi/scsi echo "scsi add-single-device 3 0 5 0" > /proc/scsi/scsi echo "scsi add-single-device 3 0 5 0" > /proc/scsi/scsi The problem can not reproduced if the kernel is running in UP mode as opposed to SMP. Version-Release number of selected component (if applicable): kernel-2.4.20-20.9 How reproducible: Always Steps to Reproduce: Run a shell script that 1. removes 3 scsi disk and then add 3 scsi disk. Using the following commands: echo "scsi remove-single-device 3 0 1 0" > /proc/scsi/scsi echo "scsi remove-single-device 3 0 5 0" > /proc/scsi/scsi echo "scsi remove-single-device 3 0 7 0" > /proc/scsi/scsi echo "scsi add-single-device 3 0 1 0" > /proc/scsi/scsi echo "scsi add-single-device 3 0 5 0" > /proc/scsi/scsi echo "scsi add-single-device 3 0 5 0" > /proc/scsi/scsi 2. sleeps for a second 3. then repeats step 1. Actual Results: The system will hang after a time ( anywhere from a few minutes to 4 hours ) Expected Results: The system should not hang. Additional info: The system just hangs with no error messages. Here is last few lines of /var/log/messages. Oct 3 15:06:12 beowulf kernel: scsi singledevice 2 0 7 0 Oct 3 15:06:12 beowulf kernel: Vendor: 3ware Model: Logical Disk 7 Rev: 1.0 Oct 3 15:06:12 beowulf kernel: Type: Direct-Access ANSI SCSI revision: 00 Oct 3 15:06:12 beowulf kernel: Attached scsi disk sdc at scsi2, channel 0, id 7, lun 0 Oct 3 15:06:12 beowulf kernel: SCSI device sdc: 488397168 512-byte hdwr sectors (250059 MB) Oct 3 15:06:12 beowulf kernel: sdc: sdc1
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