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Date:      Sat, 08 Nov 2014 22:07:06 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-fs@FreeBSD.org
Subject:   [Bug 188187] [zfs] [panic] 10-stable: Kernel panic on zpool import: integer divide fault
Message-ID:  <bug-188187-3630-jlQeKnUhSi@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-188187-3630@https.bugs.freebsd.org/bugzilla/>
References:  <bug-188187-3630@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=188187

--- Comment #5 from Steven Hartland <smh@FreeBSD.org> ---
(In reply to 6yearold from comment #0)
> I have root on ZFS and using 10-STABLE. Somewhere from March 15 i started to
> get following panic when mounting root:
> 
> Fatal trap 18: integer divide fault while in kernel mode
> Fatal trap 18: integer divide fault while in kernel mode
> cpuid = 0; cpuid = 1; apic id = 00
> apic id = 01
> instruction pointer     = 0x20:0xffffffff81a7f92d
> instruction pointer     = 0x28:0xffffffff81a7f92d
> stack pointer           = 0x28:0xfffffe0097a8b100
> stack pointer           = 0x28:0xfffffe0097a12ba0
> frame pointer           = 0x28:0xfffffe0097a8b120
> frame pointer           = 0x28:0xfffffe0097a12bc0
> code segment            = base rx0, limit 0xfffff, type 0x1b
> code segment            = base rx0, limit 0xfffff, type 0x1b
>                         = DPL 0, pres 1, long 1, def32 0, gran 1
>                         = DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags        = processor eflags       = interrupt enabled,
> interrupt enabled, resume, resume, IOPL = 0
> IOPL = 0
> current process         = current process        = 0 (system_taskq_1) 1198
> (zpool)
> trap number             = 18
> tpanic: integer divide fault
> cpuid = 0
> KDB: stack backtrace:
> #0 0xffffffff80910f30 at kdb_backtrace+0x60
> #1 0xffffffff808d6645 at panic+0x155
> #2 0xffffffff80cc9a9f at trap_fatal+0x38f
> #3 0xffffffff80cc96fc at trap+0x72c
> #4 0xffffffff80cb04f2 at calltrap+0x8
> #5 0xffffffff81a8c4e6 at vdev_mirror_io_start+0x146
> #6 0xffffffff81aa7205 at zio_vdev_io_start+0x185
> #7 0xffffffff81aa4352 at zio_execute+0x162
> #8 0xffffffff81a2f83d at arc_read+0x87d
> #9 0xffffffff81a4917e at traverse_prefetcher+0x13e
> #10 0xffffffff81a48580 at traverse_visitbp+0x270
> #11 0xffffffff81a48749 at traverse_visitbp+0x439
> #12 0xffffffff81a48fa3 at traverse_dnode+0x83
> #13 0xffffffff81a48d45 at traverse_visitbp+0xa35
> #14 0xffffffff81a48749 at traverse_visitbp+0x439
> #15 0xffffffff81a48fa3 at traverse_dnode+0x83
> #16 0xffffffff81a48a0c at traverse_visitbp+0x6fc
> #17 0xffffffff81a482b6 at traverse_prefetch_thread+0x96
> 
> I've downloaded latest snapshot of 10-STABLE, booted it and ran
> 
> ~ # zpool import -fR /mnt zroot
> 
> The error was same.

please provide the output from the kernel dump which includes line numbers.

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