Date: Sun, 11 Jan 2004 15:19:27 -0500 From: David Gilbert <dgilbert@dclg.ca> To: Andre Oppermann <andre@freebsd.org> Cc: David Gilbert <dgilbert@dclg.ca> Subject: Re: off-by-one error in ip_fragment, recently. Message-ID: <16385.45007.846035.687940@canoe.dclg.ca> In-Reply-To: <40008FCD.90525A33@freebsd.org> References: <16384.14322.83258.940369@canoe.dclg.ca> <40008783.330FAFF4@freebsd.org> <40008FCD.90525A33@freebsd.org>
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OK, I've created kern/61215 on this issue. The backtrace is:
#0 doadump () at /usr/src/sys/kern/kern_shutdown.c:240
#1 0xc0508512 in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:372
#2 0xc0508868 in panic () at /usr/src/sys/kern/kern_shutdown.c:550
#3 0xc0544fa5 in m_copym (m=0x0, off0=1500, len=1480, wait=4)
at /usr/src/sys/kern/uipc_mbuf.c:211
#4 0xc059b941 in ip_fragment (ip=0xc1e919e8, m_frag=0xdf92c9e0,
mtu=-1041688000, if_hwassist_flags=0, sw_csum=1)
at /usr/src/sys/netinet/ip_output.c:1219
#5 0xc059b55f in ip_output (m0=0x1, opt=0xc1e919e8, ro=0xc5f8edfc, flags=0,
imo=0x0, inp=0x0) at /usr/src/sys/netinet/ip_output.c:1047
#6 0xc611054f in gre_output (ifp=0xc5f8ec00, m=0xc1e91900, dst=0xc1e919e8,
rt=0xc612ce00) at /usr/src/sys/net/if_gre.c:372
#7 0xc059b4f0 in ip_output (m0=0x1, opt=0xc2b2a00e, ro=0xdf92cb7c, flags=1,
imo=0x0, inp=0x0) at /usr/src/sys/netinet/ip_output.c:1021
#8 0xc059a3c6 in ip_forward (m=0xc1e8bb00, srcrt=0, next_hop=0x0)
at /usr/src/sys/netinet/ip_input.c:1929
#9 0xc0598db0 in ip_input (m=0xc1e8bb00)
at /usr/src/sys/netinet/ip_input.c:739
#10 0xc057bc7e in netisr_processqueue (ni=0xc074a718)
at /usr/src/sys/net/netisr.c:152
#11 0xc057c093 in swi_net (dummy=0x0) at /usr/src/sys/net/netisr.c:257
#12 0xc04f5112 in ithread_loop (arg=0xc1e74500)
at /usr/src/sys/kern/kern_intr.c:544
#13 0xc04f4104 in fork_exit (callout=0xc04f4f80 <ithread_loop>, arg=0x0,
frame=0x0) at /usr/src/sys/kern/kern_fork.c:796
... it doesn't appear that udp plays a part, it does appear that
stack corruption my be in play, and it likely has to do with the fact
that the system on which this is occuring is operating as a router.
Dave.
--
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|David Gilbert, Independent Contractor. | Two things can only be |
|Mail: dave@daveg.ca | equal if and only if they |
|http://daveg.ca | are precisely opposite. |
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