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Date: Tue, 22 Oct 2013 16:01:01 -0400
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Subject: Re: 9.2 + ZFS + i386 = panic: pmap_enter: attempted pmap_enter on 4MB
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From: J David <j.david.lists@gmail.com>
To: Konstantin Belousov <kostikbel@gmail.com>
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Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org>, alc@freebsd.org,
 Andriy Gapon <avg@freebsd.org>, Alan Cox <alc@rice.edu>
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On Tue, Oct 22, 2013 at 1:35 PM, Konstantin Belousov
<kostikbel@gmail.com> wrote:
> One thing that catched my eye initially are very strange pointers in the
> backtrace, like 'zio=0x883ca8b8'. The standard i386 address space map
> splits user/kernel mode at 3GB, so 0x883ca8b8 is definitely usermode,
> unless non-standard kernel config is used.

The current kernel config for that machine is:

options SW_WATCHDOG
options KVA_PAGES=512

nodevice plip

options DDB
options BREAK_TO_DEBUGGER

options INVARIANTS
options INVARIANT_SUPPORT
options WITNESS
options DEBUG_LOCKS
options DEBUG_VFS_LOCKS
options DIAGNOSTIC


It has been tried with and without KVA_PAGES=512.  Doesn't seem to
make a difference from a crashing-all-the-time standpoint.

> This is why I asked for the gdb backtrace.

That *was* a kgdb backtrace.  Is there something else needed?

Thanks!