Date: Sat, 13 Apr 2002 17:54:33 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: Will Andrews <will@csociety.org> Cc: current@FreeBSD.org, Makoto Matsushita <matusita@jp.FreeBSD.org> Subject: Re: plug aue ethernet goes to panic Message-ID: <XFMail.20020413175433.jhb@FreeBSD.org> In-Reply-To: <20020413175429.GA65074@squall.waterspout.com>
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On 13-Apr-2002 Will Andrews wrote: > On Sat, Apr 13, 2002 at 12:44:36PM -0400, John Baldwin wrote: >> Can you get a backtrace in ddb? It looks like a null pointer dereference, >> and >> knowing where it happened would help. Finding the file and line of the >> instruction pointer using addr2line on kernel.debug would be helpful as >> well. > > It *is* a null pointer deref. Joe and I looked at this problem, > and it seems a function called device_get_ivars() isn't doing > its job in sys/dev/usb/usb_port.h. So the variable is getting > filled with a NULL pointer for the iface element and is later > deref'd. That's the limit of my debugging, and Joe is looking > into the problem actively. Well, if device_get_ivars() is returning a NULL pointer, then it probably means its parent bus device isn't setting up the ivars for the child device properly. As far as I understand, you can think of ivars as being per-device variables or state often used by a parent bus to set bus-specific information for a child device. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "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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