kern/52036: netbsd-7 kernel crash at high network load

[6bone%6bone.informatik.uni-leipzig.de@localhost]

>Number:         52036
>Category:       kern
>Synopsis:       netbsd-7 kernel crash at high network load
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Mar 06 14:20:00 +0000 2017
>Originator:     Uwe Toenjes
>Release:        NetBSD 7.0
>Organization:
University of Leipzig
>Environment:
NetBSD gate.ipv6.uni-leipzig.de 7.0_STABLE NetBSD 7.0_STABLE (MYCONF7.gdb) #0: Sat Nov 19 11:38:21 CET 2016  root%gate.ipv6.uni-leipzig.de@localhost:/usr/obj/sys/arch/amd64/compile/MYCONF7.gdb amd64

>Description:
the netbsd server crashs at high network load

debug output:


#0  0xffffffff8068beff in cpu_reboot (howto=howto@entry=260,
    bootstr=bootstr@entry=0x0) at /usr/src/sys/arch/amd64/amd64/machdep.c:671
#1  0xffffffff808b9734 in vpanic (
    fmt=0xffffffff80d03098 "kernel %sassertion \"%s\" failed: file \"%s\", line %d ", ap=ap@entry=0xfffffe813a5f7b70) at /usr/src/sys/kern/subr_prf.c:340
#2  0xffffffff80a562e3 in kern_assert (
    fmt=fmt@entry=0xffffffff80d03098 "kernel %sassertion \"%s\" failed: file \"%s\", line %d ") at /usr/src/sys/lib/libkern/kern_assert.c:51
#3  0xffffffff8096a67b in m_freem (m=0xfffffe82b75c4400)
    at /usr/src/sys/kern/uipc_mbuf.c:652
#4  0xffffffff806d6e7e in nd6_output (ifp=0xfffffe819823d010,
    origifp=origifp@entry=0xfffffe819823d010, m0=0xfffffe8745be7c00,
    dst=dst@entry=0xfffffe88264b0948, rt0=<optimized out>)
    at /usr/src/sys/netinet6/nd6.c:2305
#5  0xffffffff8056293b in ip6_output (m0=m0@entry=0xfffffe813bd1ec00,
    opt=opt@entry=0x0, ro=<optimized out>, ro@entry=0x0, flags=flags@entry=4,
    im6o=im6o@entry=0x0, so=so@entry=0x0, ifpp=ifpp@entry=0xfffffe813a5f7e30)
    at /usr/src/sys/netinet6/ip6_output.c:778
#6  0xffffffff803c1b89 in icmp6_reflect (m=m@entry=0xfffffe813bd1ec00,
    off=off@entry=40) at /usr/src/sys/netinet6/icmp6.c:2100
#7  0xffffffff803c2191 in icmp6_error (m=0xfffffe813bd1ec00,
    type=type@entry=1, code=code@entry=3, param=param@entry=0)
    at /usr/src/sys/netinet6/icmp6.c:431
#8  0xffffffff803c234f in icmp6_error2 (m=<optimized out>, type=type@entry=1,
    code=code@entry=3, param=param@entry=0, ifp=<optimized out>)
    at /usr/src/sys/netinet6/icmp6.c:287
#9  0xffffffff806d551d in nd6_llinfo_timer (arg=0xfffffe8816383550)
    at /usr/src/sys/netinet6/nd6.c:484
#10 0xffffffff80627a10 in callout_softclock (v=<optimized out>)
    at /usr/src/sys/kern/kern_timeout.c:739
#11 0xffffffff8061c758 in softint_execute (l=<optimized out>, s=2,
    si=0xffff80023b4e70c0) at /usr/src/sys/kern/kern_softint.c:589
#12 softint_dispatch (pinned=<optimized out>, s=2)
    at /usr/src/sys/kern/kern_softint.c:871
#13 0xffffffff8011412f in Xsoftintr ()


>How-To-Repeat:
The crash occurs randomly. At the time of the crash, the network load was always very high.
>Fix: