Date: Wed, 6 Dec 2000 20:39:39 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: freebsd-stable@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG Subject: Re: More on BTX halted / crashes trying to use -stable /boot/loader Message-ID: <200012070439.eB74ddE69221@earth.backplane.com> References: <200012070203.eB7231C44996@earth.backplane.com>
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Ah ha! I think I found the culprit, but I'm not sure exactly where
in the tftp code the problem is occuring.
I have been setting LOADER_TFTP_SUPPORT in /etc/make.conf so my pxeboot
file uses tftp to get the kernel rather then NFS (since NFS appears to
only be able to get [rootfs]:/kernel, which is the wrong kernel for a
diskless boot).
The option works wonderfully for /boot/pxeboot. But it turns out
that the normal /boot/loader, when compiled with the above
option, will crash horribly whenever it tries to open() a file and
can't find it in the UFS filesystem on disk... it falls through the
filesystem list until it hits the tftp FS and BEWM. Explosion.
I sure would appreciate it if one of the bootstrap gurus could take
a look at what happens when the tftp open routine is called from a
normal disk-based /boot/loader!
-Matt
: I've experimented a bit more. If I do an installworld and reboot,
: the machine crashes in one of two ways (randomly):
:
: #1 Crashes with a BTX error
:
: int 5 err 0 efl 00010206 eip 00000012
: eax 00000039 ebx 00023920 ecx 00023934 edx 00000000
: esi 00000000 edi 0000000c ebp 000943c8 esp 000943cc
: cs 002b ds 0033 es 0033 fs 0033 gs 0033 ss 0033
: cs:eip 62 00 00 00 e8 05 04 00 00 90 31 c0 cd 30 58 01
: ss:esp 1c 8a 01 00 00 00 00 00 6c 44 09 00 1a 00 00 00
:
: #2 Loader has all sorts of 'can't find file BLAH' errors, stack undeflow
: errors, and winds up at an 'ok ' prompt.
:
: Trying to run commands from the prompt sometimes work, sometimes return
: a 'stack underflow' error.
:
: --
:
: That's with the latest -stable /boot/loader.
:
: If I take that machine and net-boot it, then mount / and copy a
: /boot/loader from March 20th, then reboot the machine, the machine
: now boots just fine.
:
: If I put the -stable /boot/loader back into /boot, the machine dies.
: If I put the March 20th /boot/loader in, the machine boots just fine.
:
: Anybody have any ideas? What happened to /boot/loader between March
: and now? I am at a loss.
:
: -r-xr-xr-x 1 root wheel 163840 Dec 6 17:33 loader.NEW
: -r-xr-xr-x 1 root wheel 143360 Dec 6 17:47 loader.OLD
:
: -Matt
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