Date: Thu, 22 Dec 2016 09:00:28 -0700 From: Alan Somers <asomers@freebsd.org> To: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.cn85.dnsmgr.net> Cc: Mark Johnston <markj@freebsd.org>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: Setting a dump device from db> ? Message-ID: <CAOtMX2h63mCXAKWxSwQhv8pyvW2WEc=utj%2By%2BRmZTLZV6FwwkA@mail.gmail.com> In-Reply-To: <201612220726.uBM7QZtJ071053@pdx.rh.CN85.dnsmgr.net> References: <20161219213308.GA55919@wkstn-mjohnston.west.isilon.com> <201612220726.uBM7QZtJ071053@pdx.rh.CN85.dnsmgr.net>
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On Thu, Dec 22, 2016 at 12:26 AM, Rodney W. Grimes
<freebsd-rwg@pdx.rh.cn85.dnsmgr.net> wrote:
>> On Mon, Dec 19, 2016 at 02:16:25PM -0700, Alan Somers wrote:
>> > Is it possible to set a dump device from loader.conf or from the db>
>> > prompt? I'm trying to investigate a panic in mpr(4), but I can only
>> > reproduce it during the boot, before rc(8) has set my dump device. It
>> > looks like ada(4) initializes before mpr(4), so I should be able to
>> > dump to an ada device, if only I can figure out how. If not, I
>> > suppose I'll have to try gdb over firewire.
>>
>> You can set "dumpdev=ada0p1" or so in loader.conf. See g_dev_init() and
>> init_dumpdev(). This should probably be documented in loader.conf(5).
>
> Please review and if OK commit
>
> Index: sys/boot/forth/loader.conf
> ===================================================================
> --- sys/boot/forth/loader.conf (revision 310132)
> +++ sys/boot/forth/loader.conf (working copy)
> @@ -101,6 +101,7 @@
> #prompt="\\${interpret}" # Set the command prompt
> #root_disk_unit="0" # Force the root disk unit number
> #rootdev="disk1s1a" # Set the root filesystem
> +#dumpdev="disk1s1b" # Set a dump device early on for crashes during boot
> #tftp.blksize="1428" # Set the RFC 2348 TFTP block size.
> # If the TFTP server does not support RFC 2348,
> # the block size is set to 512. If the value
> --
> Rod Grimes rgrimes@freebsd.org
rgrimes: done
markj: Thanks for the suggestion. Unfortunately, it doesn't work in
this case, probably because geom hasn't started yet. I'll do what I
can with online debugging.
-Alan
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