Date: Tue, 30 Oct 2012 22:31:13 -0700 From: Navdeep Parhar <nparhar@gmail.com> To: Ryan Stone <rysto32@gmail.com> Cc: ae@freebsd.org, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Supermicro X8DT6 crashes in bootloader after r239066 Message-ID: <20121031053113.GA1446@itx> In-Reply-To: <CAFMmRNxxcka3oRKAyq=0Hts43VM-bvzWX_VDbyFpFV5thJOL%2Bw@mail.gmail.com> References: <CAFMmRNxxcka3oRKAyq=0Hts43VM-bvzWX_VDbyFpFV5thJOL%2Bw@mail.gmail.com>
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On Tue, Oct 30, 2012 at 08:34:53PM -0400, Ryan Stone wrote:
> I have a X8DT6 that appears to crash in the bootloader from HEAD. I say
> "appears to" because it's difficult to really see what the problem is; the
> system reboots pretty much as soon as it enters the FreeBSD boot process.
> The problem affects PXE booting, booting from ZFS on GPT on a SATA drive
> and UFS on MBR on a USB stick.
>
> The problem only occurs if I have any SATA disks plugged in. If I remove
> all SATA disks I can successfully PXE boot or boot from a USB key. I've
> tried with a couple of different SATA disks, some with GPT and some with
> MBR, and the reboot happens in both cases.
>
> The last things that I see on the serial console before the reboot is:
>
> DHCP..-
>
> ^[[06;07H^[[06;00HDH
> CP..\
> ^[
> [06;07H^[[05;00HCLIENT MAC ADDR: 00 25 90 92 19 94 GUID: 84F7C23B 5F21
> 2533 625
> C 002590921994 ^[[06;00HCLIENT IP: 172.16.1.50 MASK: 255.255.255.0 DHCP
> IP: 1
> 72.16.1.1 ^[[07;00HGATEWAY IP:
> 172.16.1.1
> ^[[08;00HPXE Loader
> 1.00^[[2JM-^@^[[01;00H^[[0
> m^[[2m^[[0m^[[2;30;40m
> ^@^[[0m^[[2;37;40m
> ^[[02;00H^[[0m^[[2;30;40m
>
> So it really doesn't seem to get very far at all.
>
> I've bisected and confirmed that the problem was introduced in r239066. I
> tried reverting that commit locally and I can boot fine again. I took a
> quick look at that commit but it appears to be way over my head. I'm
> willing to test patches or gather more debugging information; this thing
> isn't going anywhere until I can get it booting. :)
I have one of these X8DT6 systems. It has grub2 as the primary boot
loader which then loads zfsloader. Many weeks back I updated the BIOS,
grub, and FreeBSD and ran into a similar problem -- zfsloader would
start, print a few messages, and then the system would reboot. I
tracked it down to the int 0x13 call (with eax=0x4800) in bd_int13probe.
It would walk past the end of the edd_params structure and corrupt the
return address on the stack. I worked around it by padding edd_params.
I was planning to debug it further to find out which of the 3 things
that were updated caused the problem but Other Things(tm) came up. See
if this works for you too:
diff -r d35d326e437a -r e5228169f3f1 sys/boot/i386/common/edd.h
--- a/sys/boot/i386/common/edd.h Tue Oct 30 21:51:09 2012 -0700
+++ b/sys/boot/i386/common/edd.h Tue Oct 30 21:51:20 2012 -0700
@@ -62,6 +62,7 @@ struct edd_params {
uint16_t sector_size;
uint16_t edd_params_seg;
uint16_t edd_params_off;
+ char pad[64];
};
Regards,
Navdeep
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