Date: Wed, 16 Dec 2015 12:09:42 +0000 From: Steven Hartland <steven@multiplay.co.uk> To: Kristof Provost <kp@FreeBSD.org> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r292275 - in head/sys: net netinet netinet6 Message-ID: <56715486.1000901@freebsd.org> In-Reply-To: <1016D8B2-F850-44B9-B773-632BD9ABC95D@FreeBSD.org> References: <201512151602.tBFG2BTX089543@repo.freebsd.org> <8CEE530E-C08D-4BD1-B908-8EBBCEEAD1CD@FreeBSD.org> <1016D8B2-F850-44B9-B773-632BD9ABC95D@FreeBSD.org>
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This is a multi-part message in MIME format. --------------070407040602050101030405 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit On 15/12/2015 22:58, Kristof Provost wrote: >> On 15 Dec 2015, at 23:15, Kristof Provost <kp@FreeBSD.org> wrote: >> Based on the arp_announce() in the backtrace this commit looks like a possible cause. > I see this in arp_announce(): > KP: arp_announce() ifp->if_addr = 0 > > So that explains why we panic in 'lladdr = IF_LLADDR(ifp);’. > > I’ve done a very quick hack: > diff --git a/sys/netinet/if_ether.c b/sys/netinet/if_ether.c > index 2214542..9b25356 100644 > --- a/sys/netinet/if_ether.c > +++ b/sys/netinet/if_ether.c > @@ -1246,9 +1246,15 @@ arp_announce(struct ifnet *ifp) > } > IF_ADDR_RUNLOCK(ifp); > > - lladdr = IF_LLADDR(ifp); > - for (i = 0; i < cnt; i++) { > - arp_announce_addr(ifp, head + i, lladdr); > + printf("KP: %s() ifp = %p\n", __FUNCTION__, ifp); > + printf("KP: %s() ifp->if_addr = %p\n", __FUNCTION__, ifp->if_addr); > + > + if (ifp->if_addr) { > + printf("KP: %s() ifp->if_addr->ifa_addr = %p\n", __FUNCTION__, ifp->if_addr->ifa_addr); > + lladdr = IF_LLADDR(ifp); > + for (i = 0; i < cnt; i++) { > + arp_announce_addr(ifp, head + i, lladdr); > + } > } > free(head, M_TEMP); > } > > With this patch the device boots. I haven’t been able to verify if everything works because of a different issue ("Shared object "lib80211.so.1" not found, required by “ifconfig””, no doubt just a small problem with the freebsd-wifi-build scripts). > > Regards, > Kristof Thanks for all the info Kristof appreciated. It seems really odd that you're getting a link up event for an interface that doesn't have a LLA, so I'm wondering if this is the result of an issue elsewhere which this change brings to light, its as though if_attach hasn't been called. Looking at your trace the device seems to be an arswitch. If it never allocates a LLA to each port then maybe the more correct fix would be to ensure it IFF_NOARP in if_flags? I've attached a patch which should fix if you could test that would be great, but I'd still like to understand if there is something wrong elsewhere before I do. Regards Steve --------------070407040602050101030405 Content-Type: text/plain; charset=UTF-8; name="if_ether_arp.patch" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="if_ether_arp.patch" SW5kZXg6IHN5cy9uZXRpbmV0L2lmX2V0aGVyLmMKPT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gc3lzL25l dGluZXQvaWZfZXRoZXIuYwkocmV2aXNpb24gMjkyMjc1KQorKysgc3lzL25ldGluZXQvaWZf ZXRoZXIuYwkod29ya2luZyBjb3B5KQpAQCAtMTIwOSw3ICsxMjA5LDggQEAgYXJwX2Fubm91 bmNlKHN0cnVjdCBpZm5ldCAqaWZwKQogCXN0cnVjdCBpZmFkZHIgKmlmYTsKIAlzdHJ1Y3Qg aW5fYWRkciAqYWRkciwgKmhlYWQ7CiAKLQlpZiAoIShpZnAtPmlmX2ZsYWdzICYgSUZGX1VQ KSB8fCAoaWZwLT5pZl9mbGFncyAmIElGRl9OT0FSUCkpCisJaWYgKCEoaWZwLT5pZl9mbGFn cyAmIElGRl9VUCkgfHwgKGlmcC0+aWZfZmxhZ3MgJiBJRkZfTk9BUlApIHx8CisJICAgIGlm cC0+aWZfYWRkciA9PSBOVUxMKQogCQlyZXR1cm47CiAKIAllbnRyaWVzID0gODsKQEAgLTEy NDYsOSArMTI0NywxMSBAQCBhcnBfYW5ub3VuY2Uoc3RydWN0IGlmbmV0ICppZnApCiAJfQog CUlGX0FERFJfUlVOTE9DSyhpZnApOwogCi0JbGxhZGRyID0gSUZfTExBRERSKGlmcCk7Ci0J Zm9yIChpID0gMDsgaSA8IGNudDsgaSsrKSB7Ci0JCWFycF9hbm5vdW5jZV9hZGRyKGlmcCwg aGVhZCArIGksIGxsYWRkcik7CisJaWYgKGNudCA+IDApIHsKKwkJbGxhZGRyID0gSUZfTExB RERSKGlmcCk7CisJCWZvciAoaSA9IDA7IGkgPCBjbnQ7IGkrKykgeworCQkJYXJwX2Fubm91 bmNlX2FkZHIoaWZwLCBoZWFkICsgaSwgbGxhZGRyKTsKKwkJfQogCX0KIAlmcmVlKGhlYWQs IE1fVEVNUCk7CiB9Cg== --------------070407040602050101030405--
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