Date: Mon, 8 Aug 2011 07:43:08 GMT From: Christian Oaksford <coaksford@gmail.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/159595: gmirror unload Message-ID: <201108080743.p787h843007895@red.freebsd.org> Resent-Message-ID: <201108080750.p787oBwv086770@freefall.freebsd.org>
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>Number: 159595 >Category: kern >Synopsis: gmirror unload >Confidential: no >Severity: non-critical >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Mon Aug 08 07:50:11 UTC 2011 >Closed-Date: >Last-Modified: >Originator: Christian Oaksford >Release: 9.0-BETA1 >Organization: >Environment: FreeBSD fbsdvm 9.0-BETA1 FreeBSD 9.0-BETA1 #0: Thu Jul 28 17:15:31 UTC 2011 root@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64 >Description: Testing in VirtualBox 4.1.0 because I do not have hardware to dedicate to testing this. If you "gmirror unload" while you have an active mirror on 9.0-BETA1, it causes a panic. On 8.2-RC2, it tells you the device is busy. This seems to be the better behavior. gstripe does not show this behavior that gmirror does. >From the VM on which this works: fbsd-vm# uname -a FreeBSD fbsd-vm.rchist.net 8.2-RC2 FreeBSD 8.2-RC2 #0: Wed Jan 12 17:02:35 UTC 2011 root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64 fbsd-vm# gmirror label data ad4 ad6 fbsd-vm# gmirror load GEOM_MIRROR: Device mirror/data launched (2/2). fbsd-vm# gmirror unload gmirror: Could not unload module: Device busy. >From the VM on which this breaks: fbsdvm# uname -a FreeBSD fbsdvm 9.0-BETA1 FreeBSD 9.0-BETA1 #0: Thu Jul 28 17:15:31 UTC 2011 root@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64 fbsdvm# gmirror label data ada1 ada2 fbsdvm# gmirror load GEOM_MIRROR: Device mirror/data launched (2/2). fbsdvm# gmirror unload System call kldunload returning with one of the following locks held: exclusive sx kernel linker (kernel linker) r = 0 (0xffffffff81119a80) locked @ /usr/src/sys/kern/kern_linker.c:1082 panic: witness_warn cpuid = 0 KDB enter: panic [ thread pid 1058 tid 100071 ] Stopped at kdb_enter+0x3b: movq $0,0x912272(%rip) db> >How-To-Repeat: "gmirror label" two disks. Then "gmirror load" to get the mirror in operation, then "gmirror unload", on 9.0-BETA1. >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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