Date: Wed, 9 Feb 2005 03:31:59 +0100 (CET) From: Björn König <bkoenig@cs.tu-berlin.de> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/77289: system hangs while trying to unmount previously removed media Message-ID: <20050209023159.DFEF6CCD816@mail.alpha-tierchen.de> Resent-Message-ID: <200502090240.j192eM6K075477@freefall.freebsd.org>
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>Number: 77289 >Category: kern >Synopsis: system hangs while trying to unmount previously removed media >Confidential: no >Severity: serious >Priority: high >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed Feb 09 02:40:22 GMT 2005 >Closed-Date: >Last-Modified: >Originator: Björn König >Release: FreeBSD 5.3-RELEASE-p4 i386 >Organization: >Environment: System: FreeBSD hoppel.local 5.3-RELEASE-p4 FreeBSD 5.3-RELEASE-p4 #0: Mon Jan 10 10:02:44 CET 2005 root@hoppel.local:/usr/obj/usr/branch/RELENG_5_3/src/sys/HOPPEL i386 >Description: The system hangs while trying to unmount a filesystem of a removable media which was already physically removed and also if it was inserted again before. This concerns floppy disks. I also noticed similar odd behaviour with usb pen drives, but the system reboots instead and there is lot of console output. >How-To-Repeat: mount a floppy disk % mount /dev/fd0 /mnt remove media now and unmount the file system % umount /mnt the following message appears on console: fsync: giving up on dirty: 0xc1ec5420: tag devfs, type VCHR, usecount 4, writecount 0, refcount 4, flags (VV_OBJBUF), lock type devfs: EXCL (count 1) by thread 0xc19adaf0 (pid 590) dev fd0 and mount shows that the filesystem is still mounted. trying to unmount it twice let the system stop working immediately. a similar case occurs if you mount a floppy disk, remove media, insert disk again and then unmount the file system: umount: unmount of /mnt failed: Device not configured try to unmount it twice - system hangs. >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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