Date: Thu, 21 Jan 2010 20:09:34 +0100 From: Florian Smeets <flo@smeets.im> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-stable@freebsd.org Subject: Re: 7.2-STABLE page fault with kernel from 12.01.2010 / crashinfo available Message-ID: <4B58A66E.3040900@smeets.im> In-Reply-To: <201001211405.35615.jhb@freebsd.org> References: <4B58280C.50602@smeets.im> <201001211258.40316.jhb@freebsd.org> <4B589DFF.3030901@smeets.im> <201001211405.35615.jhb@freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On 1/21/10 8:05 PM, John Baldwin wrote:
> On Thursday 21 January 2010 1:33:35 pm Florian Smeets wrote:
>> On 1/21/10 6:58 PM, John Baldwin wrote:
>>> On Thursday 21 January 2010 8:25:22 am Florian Smeets wrote:
>>>> (kgdb) frame 8
>>>> #8 0xc05f8b28 in ip_forward (m=0xc23dc900, srcrt=0) at
>>>> /usr/src/sys/netinet/ip_input.c:1307
>>>> 1307 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
>>>> (kgdb) l
>>>> 1302 mcopy = NULL;
>>>> 1303 }
>>>> 1304 if (mcopy != NULL) {
>>>> 1305 mcopy->m_len = min(ip->ip_len, M_TRAILINGSPACE(mcopy));
>>>> 1306 mcopy->m_pkthdr.len = mcopy->m_len;
>>>> 1307 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
>>>> 1308 }
>>>> 1309
>>>> 1310 #ifdef IPSTEALTH
>>>> 1311 if (!ipstealth) {
>>>> (kgdb) p *m
>>>> $1 = {m_hdr = {mh_next = 0x0, mh_nextpkt = 0x0, mh_data = 0xc271e80e
>>>> "E\020", mh_len = 164, mh_flags = 3, mh_type = 1, pad = "\000"}, M_dat =
>>>> {MH = {MH_pkthdr = {rcvif = 0xc20a4800, header = 0x0, len = 164,
>>>> csum_flags = 3072,
>>>> csum_data = 65535, tso_segsz = 0, ether_vtag = 0, tags =
>>>> {slh_first = 0xc35bc380}}, MH_dat = {MH_ext = {ext_buf = 0xc271e800 "",
>>>> ext_free = 0, ext_args = 0x0, ext_size = 2048, ref_cnt = 0xc2703ab4,
>>>> ext_type = 6},
>>>> MH_databuf =
>>>> "\000?q?\000\000\000\000\000\000\000\000\000\b\000\000?:p?
>>> \006\000\000\000dL?\t<+?\202\200\020
>>>> O/\207\000\000\001\001\b\n-?b\230qms?\000\000\004\001?l?\000\000\001%r???
>>> \200\000????\034?Ot?\b?{sr\000\034org.jboss.mq.ConnectionToken?\b&?
>>>
> \237N\002\000\005I\000\004hashZ\000\asameJVML\000\bclientIDt\000\022Ljava/l\000\220\032Ae\207\000\002?
>>> 36@\210d\021\000\001?
> \001B\000!E\000\001@bV\000\000@2\032$W\213\n\034"...}},
>>>>
>>>> M_databuf =
>>>> "\000H\n?\000\000\000\000?\000\000\000\000\f\000\000??
>>> \000\000\000\000\000\000\200?[?\000?q?
>>> \000\000\000\000\000\000\000\000\000\b\000\000?:p?\006\000\000\000dL?\t<+?
>>> \202\200\020
>>>> O/\207\000\000\001\001\b\n-?b\230qms?\000\000\004\001?l?\000\000\001%r???
>>> \200\000????\034?Ot?\b?{sr\000\034org.jboss.mq.ConnectionToken?\b&?
>>>
> \237N\002\000\005I\000\004hashZ\000\asameJVML\000\bclientIDt\000\022Ljava/l\000\220\032Ae\207\000\002?
>>> 3"...}}
>>>
>>> Ok, can you do 'p *m_copy'?
>>>
>>
>> What ever you want :-)
>>
>> (kgdb) p *m_copy
>> No symbol "m_copy" in current context.
>> (kgdb) p *m_copydata
>> $2 = {void (const struct mbuf *, int, int, caddr_t)} 0xc0572e10<m_copydata>
>> (kgdb) p *mcopy
>> $1 = {m_hdr = {mh_next = 0x0, mh_nextpkt = 0x0, mh_data = 0xc23cce34
>> "E\020", mh_len = 204, mh_flags = 2, mh_type = 1, pad = "\000"}, M_dat =
>> {MH = {MH_pkthdr = {rcvif = 0xc20a4800, header = 0x0,
>> len = 204, csum_flags = 3072, csum_data = 65535, tso_segsz = 0,
>> ether_vtag = 0, tags = {slh_first = 0xc23c3e00}}, MH_dat = {MH_ext =
>> {ext_buf = 0x84001045<Address 0x84001045 out of bounds>,
>
> Hmm, ok. Can you do 'p *ip'? mcopy->m_len (204) is larger than m->m_len
> (164). That shouldn't be the case unless ip->ip_len is somehow larger than m-
>> m_len.
>
(kgdb) p *ip
$3 = {ip_hl = 5, ip_v = 4, ip_tos = 16 '\020', ip_len = 33792, ip_id =
61492, ip_off = 64, ip_ttl = 64 '@', ip_p = 6 '\006', ip_sum = 34849,
ip_src = {s_addr = 355576000}, ip_dst = {
s_addr = 2251401408}}
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4B58A66E.3040900>