Date: Thu, 9 May 2002 21:18:33 +0100 From: Josef Karthauser <joe@tao.org.uk> To: John Baldwin <jhb@FreeBSD.org> Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/dev/usb usb_port.h Message-ID: <20020509201833.GA403@genius.tao.org.uk> In-Reply-To: <XFMail.20020509130422.jhb@FreeBSD.org> References: <20020509155333.GA442@genius.tao.org.uk> <XFMail.20020509130422.jhb@FreeBSD.org>
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On Thu, May 09, 2002 at 01:04:22PM -0400, John Baldwin wrote:
>=20
> >> If you have kernel.debug lying around for this one, try using
> >> addr2line (or gdb) to get the file and line of those addresses
> >> in the backtrace. Probably just the first one is needed as this
> >> is a simple NULL pointer dereference.
> >=20
> > Ok. Here's a trace from a remote debug:
> >=20
> > Program received signal SIGSEGV, Segmentation fault.
> > sysctl_find_oidname (name=3D0xc02e50ce "ata_dma", list=3D0x0)
> > at /usr/src/sys/kern/kern_sysctl.c:79
> > 79 SLIST_FOREACH(oidp, list, oid_link) {
> > (gdb) bt
> > #0 sysctl_find_oidname (name=3D0xc02e50ce "ata_dma", list=3D0x0)
> > at /usr/src/sys/kern/kern_sysctl.c:79
> > #1 0xc01ef62c in sysctl_register_oid (oidp=3D0xc0333380)
> > at /usr/src/sys/kern/kern_sysctl.c:104
> > #2 0xc01efb70 in sysctl_register_all (arg=3D0x0)
> > at /usr/src/sys/kern/kern_sysctl.c:402
> > #3 0xc01cf7c5 in mi_startup () at /usr/src/sys/kern/init_main.c:208
> > (gdb)
> >=20
> > Joe
>=20
> I don't see how this can happen. Can you try doing a make clean to delete
> all the .o's and rebuild the kernel from scratch? Also, can you run 'nm'
> on the resulting kernel to make sure there aren't any unresolved symbols?
> (unresolved symbols have a type of 'U').
Yes, you're right. I've done a nice clean kernel build and this problem
has gone away; coupled with the env fix I've now got a system that
boots.
Sweet!
Joe
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