Date: Mon, 17 Aug 2015 09:13:38 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 202351] [ip6] [panic] Kernel panic in ip6_forward (different from 128247, 131038) Message-ID: <bug-202351-8-IYG7lEoE99@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-202351-8@https.bugs.freebsd.org/bugzilla/> References: <bug-202351-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202351 --- Comment #1 from dennis.noordsij@helsinki.fi --- It appears that m->m_pkthdr.rcvif is NULL, and the kernel panics in the if_name(m->m_pkthdr.rcvif) part of: log(LOG_DEBUG, "cannot forward " "from %s to %s nxt %d received on %s\n", ip6_sprintf(ip6bufs, &ip6->ip6_src), ip6_sprintf(ip6bufd, &ip6->ip6_dst), ip6->ip6_nxt, if_name(m->m_pkthdr.rcvif)); (kgdb) print m $2 = (struct mbuf *) 0xfffff80293e80900 (kgdb) print *m $3 = {m_hdr = {mh_next = 0xfffff80293e7d700, mh_nextpkt = 0x0, mh_data = 0xfffff80293e80968 "`", mh_len = 48, mh_type = 1, mh_flags = 16674}, M_dat = { MH = {MH_pkthdr = {rcvif = 0x0, tags = {slh_first = 0x0}, len = 1280, flowid = 0, csum_flags = 0, fibnum = 0, cosqos = 0 '\0', rsstype = 0 '\0', l2hlen = 0 '\0', l3hlen = 0 '\0', l4hlen = 0 '\0', l5hlen = 0 '\0', PH_per = {eigth = "\000\000\000\000\000\000\000", sixteen = {0, 0, 0, 0}, thirtytwo = {0, 0}, sixtyfour = {0}, unintptr = {0}, ptr = 0x0}, PH_loc = {eigth = "\000\000\000\000\000\000\000", sixteen = {0, 0, 0, 0}, thirtytwo = {0, 0}, sixtyfour = {0}, unintptr = {0}, ptr = 0x0}}, MH_dat = {MH_ext = {ref_cnt = 0x73cfb0000003333, ext_buf = 0x60dd861f776354 <Address 0x60dd861f776354 out of bounds>, ext_size = 96, ext_type = 4, ext_flags = 16723160, ext_free = 0x80fe, ext_arg1 = 0x1f7763feff54073e, ext_arg2 = 0x2ff}, Replacing the above log message with something safe shows that it does get called at roughly the same frequency as the previous panics, but without panicking. Of course I don't know if it is valid for rcvif to be NULL, or if some corruption occurs elsewhere. If anyone wants to debug this further I am happy to assist. -- You are receiving this mail because: You are the assignee for the bug.
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