Date: Thu, 23 Jun 2011 18:59:09 GMT From: Paul B Mahol <onemda@gmail.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/158231: panic on unmounting nullfs mounted over ufs on usb stick that got detached Message-ID: <201106231859.p5NIx96V001280@red.freebsd.org> Resent-Message-ID: <201106231900.p5NJ0NXC060746@freefall.freebsd.org>
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>Number: 158231 >Category: kern >Synopsis: panic on unmounting nullfs mounted over ufs on usb stick that got detached >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Thu Jun 23 19:00:22 UTC 2011 >Closed-Date: >Last-Modified: >Originator: Paul B Mahol >Release: FreeBSD CURRENT >Organization: >Environment: FreeBSD home 9.0-CURRENT FreeBSD 9.0-CURRENT #0 r223183+87c92c3: Sun Jun 19 04:19:19 UTC 2011 root@:/usr/obj/usr/src/sys/kernel i386 >Description: panic when umounting nullfs if target is gone. >How-To-Repeat: Mount usb stick, da0s1a (ufs fs) on /mnt mount point. Now use nullfs to mount usb file system directory onto / subdirectory on ada0s1a, for example: mount_nullfs /mnt/path/to/dir /usr/some/stuff_on_hard_disk Umount (force) or detach usb stick. Force umount of nullfs, kernel will panic. >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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