From owner-freebsd-current@FreeBSD.ORG  Mon Aug 25 14:17:42 2003
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Date: Mon, 25 Aug 2003 14:17:41 -0700 (PDT)
From: Nate Lawson <nate@root.org>
To: Lars Eggert <larse@ISI.EDU>
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cc: current@freebsd.org
Subject: Re: panic with CF drive + USB reader
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>this happens with an IBM MicroDrive mounted on a USB CF reader, -current
>from 8/19/03. I couldn't get a coredump:
>
>umass0: BBB reset failed, STALLED
>(da2:umass-sim0:0:0:0): AutoSense Failed
>umass0: BBB reset failed, STALLED
>(da2:umass-sim0:0:0:0): AutoSense Failed
>panic: softdep_setup_freeblocks: inode busy
>da2 at umass-sim0 bus 0 target 0 lun 0
>da2: <SanDisk ImageMate II 1.30> Removable Direct Access SCSI-2 device
>da2: 1.000MB/s transfers
>da2: 1027MB (2104705 512 byte sectors: 255H 63S/T 131C)

Your microdrive may need some USB quirks.  Try RS_NO_CLEAR_UA (see
/sys/dev/usb/umass.c for examples).

-Nate