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port-i386/42331: ICMP6 causes crash (supervisor page fault)

>Number:         42331
>Category:       port-i386
>Synopsis:       ICMP6 causes crash (supervisor page fault)
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Nov 16 09:35:00 +0000 2009
>Originator:     Vincent Habchi
>Release:        5.0.1
NetBSD 5.0.1 NetBSD 5.0.1 (HP) #1: Mon Nov 16 
10:13:00 CET 2009
Under some unknown conditions (but it happened twice in a week), ICMP6 crashes 
the machine. The bug is in m_copym0, called from icmp6_input, and the rest of 
the stack is ip6_input, ip6_intr, softint_dispatch and Xsoftintr (as far as DDB 
shows). The reason is a supervisor page fault trap in m_copym0.

The network interface is a sip:

sip0 at pci1 dev 2 function 0: NatSemi DP83815 10/100 Ethernet, rev 00
sip0: interrupting at ioapic0 pin 18
sip0: Ethernet address 00:a0:cc:77:da:46
nsphyter0 at sip0 phy 0: DP83815 10/100 media interface, rev. 1

It just happens while pinging (ping6) or trying to fetch some mail through 

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