Hi Tejun, Below are the tests I performed: Test1: a) Power off the drive b) echo "scsi remove-single-device h b t l" > /proc/scsi/scsi or delete using sysfs c) Power on the drive d) echo "scsi add-single-device h b t l" > /proc/scsi/scsi or scan using sysfs The kernel error in my first email is induced in this test but not consistently reproducible. In most of the case, no kernel error but sg was not reattached when adding device. Test2: Ignore step c) in test1. Basically, try to add device while the device is still powered off. Hope this helps. Thanks, Fajun On 8/25/06, Tejun Heo <htejun@xxxxxxxxx> wrote:
Fajun Chen wrote: > Hi Tejun, > > JFYI. I found a workaround which seems to be working in 2.6.18-rc2. > During warm plug/unplug, if I don't delete the device through sysfs or > proc and just rescan the host, it recovered just fine. Hello, I'm trying to reproduce it here but haven't succeeded yet. Can you describe what you did in more detail? I'm trying various things - issuing delete / scan, combination of them after unplugging my drive, etc..., but haven't succeeded in reproducing your error condition. It seems to be a sdev refcnting problem in libata but I need more clue... Thanks. -- tejun
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