Date: 3 Jun 2003 22:39:16 -0000 From: Pawel Malachowski <pawmal@unia.3lo.lublin.pl> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/52916: vinum causes panic after start/stop/... cycle, easy to reproduce Message-ID: <20030603223916.85577.qmail@unia.3lo.lublin.pl> Resent-Message-ID: <200306032240.h53Me6Nv076462@freefall.freebsd.org>
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>Number: 52916
>Category: kern
>Synopsis: vinum causes panic after start/stop/... cycle, easy to reproduce
>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 03 15:40:06 PDT 2003
>Closed-Date:
>Last-Modified:
>Originator: Paweł Małachowski
>Release: FreeBSD 4.8-STABLE i386
>Organization:
ZiN
>Environment:
FreeBSD 4.8-RELEASE FreeBSD 4.8-RELEASE #0: Thu Apr 3 10:53:38 GMT 2003
root@freebsd-stable.sentex.ca:/usr/obj/usr/src/sys/GENERIC i386
>Description:
Both 4.8-RELEASE and fresh 4.8-STABLE (on two different machines) catch
kernel panic when I try something like:
vinum start;vinum stop;vinum start;vinum stop;vinum start;vinum stop
It is very easy to reproduce.
4.8-STABLE was compiled with debug symbols, unfortunately there is no
crashdump. Panic message from 4.8-STABLE (vinum as kld):
vinum: loaded
vinum: no drives found
vinum: unloaded
vinum: loaded
vinum: no drives found
vinum: unloaded
vinum: loaded
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0xb7
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc01bedc8
stack pointer = 0x10:0xd5749dc4
frame pointer = 0x10:0xd5749dd8
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 107 (syslogd)
interrupt mask = none
trap number = 12
panic: page fault
syncing disks...
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0xb7
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc01bedc8
stack pointer = 0x10:0xd5749b04
frame pointer = 0x10:0xd5749b18
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 107 (syslogd)
interrupt mask = bio
trap number = 12
panic: page fault
Uptime: 1m6s
So I compiled vinum statically into kernel,
# vinum start;vinum stop;vinum start;vinum stop;
** no drives found: No such file or directory
Can't unload vinum: No such file or directory
** no drives found: No such file or directory
Can't unload vinum: No such file or directory
and it crashed again with message like this:
vinum: no drives found
vinum: no drives found
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0xb7
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc01cc204
stack pointer = 0x10:0xd51e0e6c
frame pointer = 0x10:0xd51e0e80
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 6 (syncer)
interrupt mask = bio
trap number = 12
panic: page fault
>How-To-Repeat:
Install minimal 4.8-RELEASE from ISO, type:
vinum start;vinum stop;vinum start;vinum stop;vinum start;vinum stop;
few times.
Note, creating vinum objects is not necessary!
Also note:
kldload vinum;kldunload vinum;kldload vinum;kldunload vinum;
doesn't produce panic on my machine.
I caught first panic when I tried `vinum stop' while reviving subdisk
(however, vinum was loaded/unloaded few times earlier cause configuration
was obliterated).
>Fix:
Unknown.
>Release-Note:
>Audit-Trail:
>Unformatted:
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