Date: Thu, 1 Apr 2010 22:14:25 +0100 (BST) From: Christopher Key <chris@chacal.cjkey.org.uk> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/145272: Panic during boot when accessing zfs on a gmirror Message-ID: <201004012114.o31LEPVK001583@chacal.wzl33> Resent-Message-ID: <201004012150.o31Lo7Sw065985@freefall.freebsd.org>
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>Number: 145272
>Category: kern
>Synopsis: Panic during boot when accessing zfs on a gmirror
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Apr 01 21:50:07 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: Christopher Key
>Release: FreeBSD 8.0-RELEASE-p2 amd64
>Organization:
>Environment:
System: FreeBSD chacal.wzl33 8.0-RELEASE-p2 FreeBSD 8.0-RELEASE-p2 #1: Thu Apr 1 21:31:00 BST 2010 root@chacal.wzl33:/usr/obj/usr/src/sys/CHACAL-DEBUG amd64
>Description:
Panic during boot when accessing zfs on a gmirror.
This appears to have become a problem between 7.2-RELEASE and 8.0-RELEASE. The steps below that reproduce the problem haven't been directly tested on a 7.2 system, but a similar configuration (zpool on a single slice on a gmirror) that worked under 7.2 shows identical symptoms under 8.0.
>How-To-Repeat:
# gmirror label gmtest /dev/da5
# zpool create zptest /dev/mirror/gmtest
# zpool export zptest
# reboot
... system boots fine.
# zpool import zptest
# reboot
... during boot:
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x0
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff80aa7dfe
stack pointer = 0x28:0xffffff803f8a06e0
frame pointer = 0x28:0xffffff803f8a0740
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 42 (zfs)
trap number = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
panic() at panic+0x182
trap_fatal() at trap_fatal+0x2ad
trap_pfault() at trap_pfault+0x294
trap() at trap+0x3cf
calltrap() at calltrap+0x8
--- trap 0xc, rip = 0xffffffff80aa7dfe, rsp = 0xffffff803f8a06e0, rbp = 0xffffff 803f8a0740 ---
vdev_geom_open() at vdev_geom_open+0x10e
vdev_open() at vdev_open+0xa8
vdev_root_open() at vdev_root_open+0x86
vdev_open() at vdev_open+0xa8
spa_load() at spa_load+0x1d0
spa_load() at spa_load+0x452
spa_open_common() at spa_open_common+0x12d
spa_get_stats() at spa_get_stats+0x42
zfs_ioc_pool_stats() at zfs_ioc_pool_stats+0x2c
zfsdev_ioctl() at zfsdev_ioctl+0x8d
devfs_ioctl_f() at devfs_ioctl_f+0x77
kern_ioctl() at kern_ioctl+0xf6
ioctl() at ioctl+0xfd
syscall() at syscall+0x246
Xfast_syscall() at Xfast_syscall+0xe1
--- syscall (54, FreeBSD ELF64, ioctl), rip = 0x800fe874c, rsp = 0x7fffffffd808, rbp = 0x80122d440 ---
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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