Date: 25 Jun 2002 15:04:28 -0000 From: Michal Pasternak <michal@pasternak.w.lub.pl> To: FreeBSD-gnats-submit@FreeBSD.org Subject: i386/39844: PANIC using mount -> atacontrol detach -> ls/cat that device Message-ID: <20020625150428.790.qmail@pr93.lublin.sdi.tpnet.pl>
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>Number: 39844
>Category: i386
>Synopsis: PANIC using mount -> atacontrol detach -> ls/cat that device
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Jun 25 08:10:09 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Michal Pasternak
>Release: FreeBSD 4.6-STABLE i386
>Organization:
>Environment:
System: FreeBSD pasternak.w.lub.pl 4.6-STABLE FreeBSD 4.6-STABLE #1: Tue Jun 18 04:33:07 CEST 2002 doc@pasternak.w.lub.pl:/usr/obj/usr/src/sys/ILIT i386
>Description:
Using devices, that are mounted, but their controllers
are detached (using atacontrol) causes PANIC.
My config:
atapci0: <VIA 82C686 ATA66 controller> port 0xd000-0xd00f at device 7.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
ad0: 8223MB <ST38410A> [16708/16/63] at ata0-master UDMA66
acd0: CDROM <ATAPI CDROM 48X> at ata1-slave PIO4
>How-To-Repeat:
1. mount something on 2nd IDE controller (ata1)
2. detach IDE controller (atacontrol detach 1)
3. ls or cat mounted device - system panics
>Fix:
I have some ideas, like:
1. atacontrol SHOULD NOT allow to detach controllers, which have
mounted devices
2. atacountrol should DISPLAY A BIG FAT WARNING and ASK FOR A
CONFIRMATION when trying to detach controller with mounted device
3. atacountrol should automagically umount devices
4. manpage should DISPLAY A BIG FAT WARNING
5. additional checks in device drivers (is the device we're trying to
read available, together with it's controller) could IMVHO
slow things down, but I'm not a kernel hacker, so how should I know
>Release-Note:
>Audit-Trail:
>Unformatted:
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