Hello, I guess a bogus patch went in the standard kernel somewhere between 2.6.3-mm1 and 2.6.3-mm3. The device mapper tree (udm?) use to package the mm patchset. Starting with 2.6.2, I've had to reverse the mm? patch from udm? not to hit the following bug. 2.6.3-mm3 has the culprit in linus.patch. The attached capture is all I can gather. It happens sometimes during "modprobe sd_mod" after a successful "modprobe qla2200". Anyway, a SG inquiry triggers it reliably. Of notice, there are failed device (StorageWorks' ghosts devs) detected by scsi_scan in REPORT_LUN mode. Hope it helps, cvaroqui