Date: Fri, 21 Dec 2007 23:41:43 -0500 From: Mikhail Teterin <mi+kde@aldan.algebra.com> To: stable@FreeBSD.org Cc: freebsd-usb@FreeBSD.org Subject: usb/umass, devfs: this sucks Message-ID: <200712212341.44308@aldan>
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Another attempt to use USB-storage with FreeBSD, another moment of hair-pulling frustration. I attach the card-reader with the media card already inserted (detection of card-insertion has not worked in a long time, if ever). The "disk" appears: umass1: Genesys USB Reader, rev 2.00/91.38, addr 3 da6 at umass-sim1 bus 1 target 0 lun 0 da6: <Generic STORAGE DEVICE 9138> Removable Direct Access SCSI-0 device da6: 40.000MB/s transfers da6: 1938MB (3970048 512 byte sectors: 255H 63S/T 247C) (da6:umass-sim1:1:0:0): AutoSense Failed But the "slices" (/dev/da6s1, etc.) don't appear: http://www.freebsd.org/cgi/query-pr.cgi?pr=usb/76461 In the past, trying to mount, or otherwise read the da6 would result in the slices appearing -- an awful wart, when it works. So I try it, but it does not work: root@aldan:/home/mi (116) mount -tmsdosfs /dev/da6 /mnt ... hang ... Pressing Ctrl-T: load: 0.58 cmd: mount_msdosfs 64452 [GEOM topology] 0.00u 0.00s 0% 804k ... load: 0.47 cmd: mount_msdosfs 64452 [GEOM topology] 0.00u 0.00s 0% 804k It still hangs, and now other things hang too. top, for example, hangs on start-up: mi@aldan:~ (1084) top ... hang ... Pressing Ctrl-T: load: 0.57 cmd: top 64480 [devfs] 0.00u 0.00s 0% 1652k load: 0.57 cmd: top 64480 [devfs] 0.00u 0.00s 0% 1652k load: 0.57 cmd: top 64480 [devfs] 0.00u 0.00s 0% 1652k load: 0.57 cmd: top 64480 [devfs] 0.00u 0.00s 0% 1652k No new window can be opened either -- presumably due to devfs hanging. I suspect, that anything attempting to use even the /dev/null is hanging now. So, not only the USB itself is broken, our wonderful devfs is rather creaky too -- nothing should be in an uninterruptible state like this for more than a millisecond. 25 minutes later the mount finally gave up: umass1: BBB reset failed, TIMEOUT umass1: BBB bulk-in clear stall failed, TIMEOUT umass1: BBB bulk-out clear stall failed, TIMEOUT mount_msdosfs: /dev/da6: Input/output error Things are back to "normal" again, but the media card is still inaccessible. I'll try to work with it using mtools -- I had some success in the pass accessing the FAT-filesystem on the media cards using mcopy, mdir, etc. I'm using 6.3-PRERELEASE as of Dec 6th, but a search for umass-related bugs http://www.freebsd.org/cgi/query-pr-summary.cgi?text=umass reveals plenty of really old problems, which don't even have a single follow-up from FreeBSD-developers. Like: http://www.freebsd.org/cgi/query-pr.cgi?pr=usb/95037 http://www.freebsd.org/cgi/query-pr.cgi?pr=usb/95173 http://www.freebsd.org/cgi/query-pr.cgi?pr=usb/107848 Looks like USB is unmaintained and getting worse. Are we really shipping this as "the most recent stable release"? -mi
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