Date: Fri, 10 Nov 2000 17:55:08 -0800 (PST) From: John Baldwin <jhb@FreeBSD.org> To: Matthew Jacob <mjacob@feral.com> Cc: current@FreeBSD.org, John Polstra <jdp@polstra.com> Subject: Re: savecore broken because kern.bootfile is set wrong Message-ID: <XFMail.001110175508.jhb@FreeBSD.org> In-Reply-To: <Pine.LNX.4.21.0011101734230.31159-100000@zeppo.feral.com>
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On 11-Nov-00 Matthew Jacob wrote: > > >> Savecore isn't working in -current, dying in my case with "read: >> invalid argument". (This is on an Alpha -- I don't have an i386 >> -current machine to test it on at the moment.) I traced it down to >> the fact that getbootfile() is returning "kernel" -- not the full >> pathname as the man page promises. This seems to be because the >> "kern.bootfile" sysctl variable isn't getting set correctly: >> >> alpha# sysctl kern.bootfile >> kern.bootfile: kernel >> >> Because I had an old "/kernel" file and savecore runs in "/", it was >> finding the wrong kernel. >> >> This seems to be some sort of coordination problem between the loader >> and the kernel and, maybe, the Alpha SRM. Can anybody shed some light > > Not SRM. SRM cares not. > > >> on it? >> >> Also, in "src/sys/boot/common/boot.c" we still have this: >> >> static const char *default_bootfiles = "kernel.ko"; >> >> which isn't right any more. > > > Absolutely wrong, yes. > > Look at kern_mib.c: > > > char kernelname[MAXPATHLEN] = "/kernel"; /* XXX bloat */ > > SYSCTL_STRING(_kern, KERN_BOOTFILE, bootfile, CTLFLAG_RW, > kernelname, sizeof kernelname, "Name of kernel file booted"); > > > This is also wrong now. > > It's somewhat problematic in that the actual kernel name is kernel, still, > but > the path that it is found in depends on where the loader actually found it- > that's contingent on module_path. > > I don't know whether the loader is supposed to modify kernelname in the > loaded > kernel to have the actual path or not. It is supposed to. Looks like a bug in the alpha startup code somewhere: > uname -a FreeBSD laptop.baldwin.cx 5.0-CURRENT FreeBSD 5.0-CURRENT #40: Fri Nov 10 15:17:48 PST 2000 john@laptop.baldwin.cx:/usr/src/sys/compile/LAPTOP-card i386 > sysctl kern.bootfile kern.bootfile: /boot/kernel.card/kernel > uname -a FreeBSD baz.osd.bsdi.com 5.0-CURRENT FreeBSD 5.0-CURRENT #48: Fri Nov 3 12:37:16 PST 2000 root@baz.osd.bsdi.com:/usr/src/sys/compile/BAZ alpha > sysctl kern.bootfile kern.bootfile: kernel > -matt -- John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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