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From: John Baldwin <jhb@freebsd.org>
To: freebsd-current@freebsd.org, Cy Schubert <Cy.Schubert@komquats.com>
Cc: Jeremie Le Hen <jlh@freebsd.org>, Adrian Chadd <adrian.chadd@gmail.com>,
 Ryan Stone <rysto32@gmail.com>,
 =?ISO-8859-1?Q?Jean=2DS=E9bastien_P=E9dron?= <dumbbell@freebsd.org>,
 "?Alan L. Cox" <alc@freebsd.org>
Subject: Re: Panic from vesa_configure()
Date: Sat, 09 Jan 2016 11:30:46 -0800
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On Thursday, January 07, 2016 01:47:32 AM Cy Schubert wrote:
> In message <CAGSa5y0QiKV9SgJYJ_mz3SnJGNjieHSvYP8nLjt9eWXo4RU6ww@mail.gmail.c
> om>
> , Jeremie Le Hen writes:
> > On Mon, Dec 21, 2015 at 12:57 AM, Adrian Chadd <adrian.chadd@gmail.com> wrote
> > :
> > > can you copy/paste the file:line that each of those stackframes represents?
> > >
> > > I may have an idea or two..
> > 
> > Sure here we go:
> > 
> > (kgdb) list *vesa_configure+0x270
> > 0xffffffff80b25cd0 is in vesa_configure (/usr/src-svn/sys/dev/fb/vesa.c:827).
> > 
> > (kgdb) list *vga_init+0x65
> > 0xffffffff80b286e5 is in vga_init (/usr/src-svn/sys/dev/fb/vga.c:1402).
> > 
> > (kgdb) list *isavga_attach+0x92
> > 0xffffffff80b9afd2 is in isavga_attach (/usr/src-svn/sys/isa/vga_isa.c:224).
> 
> Here is what I see. Only happens on real hardware (not VirtualBox VMs).
> 
> uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
> uart0: console (9600,n,8,1)
> acpi_alloc_wakeup_handler: can't alloc wake memory

This is probably related to the same cause.  Both this and the x86 BIOS stuff
need "low" memory (memory below 1MB).

x86bios_alloc() uses contigmalloc() as does acpi_alloc_wakeup_handler().
Perhaps the recent changes to contigmalloc() affect this?  In particular,
try reverting r292469 to see if that fixes the issue.

-- 
John Baldwin