From owner-freebsd-stable@freebsd.org  Sun Jul 23 13:20:21 2017
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Subject: Re: stable/11: Kernel page fault with the following non-sleepable
 locks held: CAM device lock
To: FreeBSD Stable <freebsd-stable@FreeBSD.org>
References: <59749E58.2060408@grosbein.net>
From: Eugene Grosbein <eugen@grosbein.net>
Message-ID: <5974A287.8060101@grosbein.net>
Date: Sun, 23 Jul 2017 20:20:07 +0700
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On 23.07.2017 20:02, Eugene Grosbein wrote:

> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address   = 0xa
> fault code              = supervisor read data, page not present
> instruction pointer     = 0x20:0xffffffff80e494e1
> stack pointer           = 0x28:0xfffffe04675ff670
> frame pointer           = 0x28:0xfffffe04675ff670
> 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         = 1387 (smartd)
> trap number             = 12
> panic: page fault
> cpuid = 0

I also have a screenshot of another case of same panic that notes
lock order reversal: (Giant after non-sleepable):

http://www.grosbein.net/freebsd/crash.png