Date: Sun, 28 Aug 2005 22:26:33 +0800 From: Rong-En Fan <grafan@gmail.com> To: stable@freebsd.org Subject: Re: got a panic on 5.4-STABLE Message-ID: <6eb82e050828072614654966@mail.gmail.com> In-Reply-To: <6eb82e05082806466960292@mail.gmail.com> References: <6eb82e05082806466960292@mail.gmail.com>
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On 8/28/05, Rong-En Fan <grafan@gmail.com> wrote: > Hi, > > I got a panic on an i386 5.4-STABLE around Aug 28 with SMP enabled. > It has 2 physical CPU with HTT enabled (so, total 4 cpus). > This is a NFS server only with external scsi raid attached. > > The console log, kgdb output and sysctl.conf are as below. > I'll keep this core and if someone is interested, I can send any other > information requested. I have the following in make.conf: CPUTYPE?= p4 CFLAGS= -O -pipe COPTFLAGS= -O -pipe The difference between GENERIC and my kernel is here: http://www.rafan.org/FreeBSD/panic/m_copym/kernel-diff-against-GENERIC.txt And I also looked at the dump file, looks like that when calling m_copym(), m->m_len is 20, off is 1500, m->m_next is NULL After first iteration, m becomes NULL... #20 0xc051d62f in m_copym (m=0x0, off0=1500, len=1480, wait=1) at /usr/src/sys/kern/uipc_mbuf.c:389 389 m = m->m_next; (kgdb) l 384 while (off > 0) { 385 KASSERT(m != NULL, ("m_copym, offset > size of mbuf chain")); 386 if (off < m->m_len) 387 break; 388 off -= m->m_len; 389 m = m->m_next; 390 } 391 np = ⊤ 392 top = 0; 393 while (len > 0) { (kgdb) p off $15 = 1480 (kgdb) up #21 0xc0576835 in ip_fragment (ip=0xc20d8de4, m_frag=0xe7088b48, mtu=-1039299264, if_hwassist_flags=6, sw_csum=1) at /usr/src/sys/netinet/ip_output.c:967 967 m->m_next = m_copy(m0, off, len); (kgdb) p off $9 = 1500 (kgdb) p len $10 = 1480 (kgdb) p m0 $11 = (struct mbuf *) 0xc20d8d00 (kgdb) p *m0 $12 = {m_hdr = {mh_next = 0x0, mh_nextpkt = 0x0, mh_data = 0xc20d8d40 "E", mh_len = 20, mh_flags = 2050, mh_type = 2}, M_dat = {MH = {MH_pkthdr = {rcvif = 0x0, len = 8348, header = 0xc5b25010, csum_flags = 0, csum_data = 6, tags = {slh_first = 0x0}}, MH_dat = {MH_ext = { ext_buf = 0xc33ae000 "oker</a>\nonline casinos <a href=http://www.lucky-777-casinos.com>online casinos</a>\nviagra <a href=http://www.ALL-VIAGRA.INFO>vip�", ext_free = 0, ext_args = 0x0, ext_size = 2048, ref_cnt = 0xdc050045, ext_type = 549021963}, MH_databuf = "\000�:�\000\000\000\000\000\000\000\000\000\b\000\000E\000\005�\vi� @\0 021��\214p\0360\214p\036\034@\021��\214p\0360\214p\036%\b\001\003 \000xU�mJ\207�\000\000\000\0 001", '\0' <repeats 23 times>, "\002\000\000\001�\000\000\000\002\000\000q�\000\000\001�\000\0 000\000\000\000\000\002\000\000\000\000\000\000\000\b\000\000\000\000\001\001\217\000\021\000\000\000\000\000\000\004\034\000\000\000\000\000\031\024�C\021m�\000\000\000\000B�[�\000\000\0 000\000B�[�\000\000\000\016\fo\2117\000\016\f^̺\b\000E\000\234 \vi\000\000@\021��\214p\0360\214 4p\036\034\b\001\003� \210N�"}}, M_databuf = "\000\000\000\000\234 \000\000\020P��\000\000\000\000\006\000\000\000\000\000 0\000\000\000�:�\000\000\000\000\000\000\000\000\000\b\000\000E\000\005�\vi� @\021��\214p\0360 0\214p\036\034@\021��\214p\0360\214p\036%\b\001\003 \000xU�mJ\207�\000\000\000\001", '\0' <rep peats 23 times>, "\002\000\000\001�\000\000\000\002\000\000q�\000\000\001�\000\000\000\000\000 0\000\002\000\000\000\000\000\000\000\b\000\000\000\000\001\001\217\000\021\000\000\000\000\000\000\004\034\000\000\000\000\000\031\024�C\021m�\000\000\000\000B�[�\000\000\000\000B�[�\000 0\000\000\016\fo\2117\000\016\f^̺\b\000E\000\234 \vi\000\000@"...}} (kgdb) l 962 len = ip->ip_len - off; 963 m->m_flags |= M_LASTFRAG; 964 } else 965 mhip->ip_off |= IP_MF; 966 mhip->ip_len = htons((u_short)(len + mhlen)); 967 m->m_next = m_copy(m0, off, len); 968 if (m->m_next == NULL) { /* copy failed */ 969 m_free(m); 970 error = ENOBUFS; /* ??? */ 971 ipstat.ips_odropped++; (kgdb) up #22 0xc05764a6 in ip_output (m=0xc20d8d00, opt=0xc20d8de4, ro=0xe7088b14, flags=0, imo=0x0, inp=0xc24317bc) at /usr/src/sys/netinet/ip_output.c:796 796 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, sw_csum); (kgdb) p ip $16 = (struct ip *) 0xc20d8de4 (kgdb) p *ip $19 = {ip_hl = 5, ip_v = 4, ip_tos = 0 '\0', ip_len = 8348, ip_id = 26891, ip_off = 0, ip_ttl = 64 '@', ip_p = 17 '\021', ip_sum = 54716, ip_src = {s_addr = 807301260}, ip_dst = {s_addr = 471756940}} Thanks, Rong-En fan
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