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Subject: [Bug 193681] kernel panic: dhclient NULL pointer in
 ether_output_frame() when using dummynet at layer2
Date: Tue, 16 Sep 2014 11:27:17 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193681

--- Comment #3 from Kate <kate@elide.org> ---
Without layer2, but with bridge0 present, this symptom also occurs:

# sysctl net.link.ether.ipfw=1
net.link.ether.ipfw: 0 -> 1
# sysctl net.link.bridge.ipfw=1
net.link.bridge.ipfw: 0 -> 1
#
# ipfw add 100 pipe 1 ip from any to any     # note no layer2
00100 pipe 1 ip from any to any
# ipfw pipe 1 config
#
# dhclient arge0
DHCPDISCOVER on arge0 to 255.255.255.255 port 67 interval 4
Trap cause = 2 (TLB miss (load or instr. fetch) - kernel mode)
[ thread pid 11 tid 100024 ]
Stopped at      ether_output_frame+0x50:        lw      v0,680(s0)
db>

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