Date: Sat, 18 Oct 1997 18:46:08 +0200 From: j@uriah.heep.sax.de (J Wunsch) To: freebsd-scsi@FreeBSD.org (FreeBSD SCSI list) Subject: Re: Cannot happen? Message-ID: <19971018184608.DL48173@uriah.heep.sax.de> In-Reply-To: <19971018143116.KS08343@uriah.heep.sax.de>; from J Wunsch on Oct 18, 1997 14:31:17 %2B0200 References: <19971018143116.KS08343@uriah.heep.sax.de>
next in thread | previous in thread | raw e-mail | index | archive | help
I wrote: > Oct 18 14:28:26 uriah /kernel: sd0: ILLEGAL REQUEST asc:21,0 Logical block address out of range field replaceable unit: d sks:cf,7 > But the questions is: how can this happen? Ain't the driver supposed > to limit the requests before calling the SCSI layers? Ain't the > filesystem supposed to never attempt to access outside the disk > limits? The driver does, but accesses through the buffer cache cause harm. Maybe this was a faulty filesystem, but somehow there's a bug that causes a problem when i try to access the very last block of the disk through the buffer cache. Access to the raw device works as expected: j@uriah 55% ./dd if=/dev/rsd0 skip=4197400 of=/dev/null 5+0 records in 5+0 records out 2560 bytes transferred in 0.204268 secs (12533 bytes/sec) (The disk capacity is indeed 4197405 blocks.) j@uriah 56% ./dd if=/dev/sd0 skip=4197400 of=/dev/null dd: /dev/sd0: Invalid argument 4+0 records in 4+0 records out 2048 bytes transferred in 0.055174 secs (37119 bytes/sec) j@uriah 57% Oct 18 18:44:59 uriah /kernel: sd0: ILLEGAL REQUEST asc:21,0 Logical block address out of range field replaceable unit: d sks:cf,7 ...but access to the buffered device bails out when getting at the last block on the disk. -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19971018184608.DL48173>