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Date: Fri, 30 Nov 2012 04:42:45 -0800 (PST)
From: sig6247 <sig6247@gmail.com>
To: Konstantin Belousov <kostikbel@gmail.com>
Subject: Re: clang compiled kernel panic when mounting zfs root on i386
In-Reply-To: <20121129232944.GQ3013@kib.kiev.ua> (Konstantin Belousov's
 message of "Fri, 30 Nov 2012 01:29:44 +0200")
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Cc: freebsd-current@freebsd.org, Bruce Evans <brde@optusnet.com.au>,
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On Fri, 30 Nov 2012 01:29:44 +0200, Konstantin Belousov <kostikbel@gmail.com> wrote:

> Please apply the patch below and obtain the backtrace of the double fault
> panic again. I will commit the patch later.

Thanks for the patch. 

WARNING: WITNESS option enabled, expect reduced performance.
Trying to mount root from zfs:zroot []...

Fatal double fault:
eip = 0xc0e93e07
esp = 0xc86bffbc
ebp = 0xc86c0032
cpuid = 1; apic id = 01
panic: double fault
cpuid = 1
KDB: enter: panic
[ thread pid 1 tid 100002 ]
Stopped at      kdb_enter+0x3d: movl    $0,kdb_why
db> bt
Tracing pid 1 tid 100002 td 0xc89efbc0
kdb_enter(c1065960,c1065960,c10b903b,c139f438,aef01785,...) at kdb_enter+0x3d/frame 0xc139f3f0
panic(c10b903b,1,1,1,c86c0032,...) at panic+0x14b/frame 0xc139f42c
dblfault_handler() at dblfault_handler+0xab/frame 0xc139f42c
--- trap 0x17, eip = 0xc0e93e07, esp = 0xc86bffbc, ebp = 0xc86c0032 ---
__qdivrem(0,aba80000,c10d,98600000,68c119,...) at __qdivrem+0x197/frame 0xc86c0032
db>