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bin/54843: dhcpcd dumps core

>Number:         54843
>Category:       bin
>Synopsis:       dhcpcd dumps core
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 08 08:00:00 +0000 2020
>Originator:     Martin Husemann
>Release:        NetBSD 9.99.34
The NetBSD Foundation, Inc.
System: NetBSD 9.99.34 NetBSD 9.99.34 (UNPLUGED) #284: Mon Jan 6 12:33:40 CET 2020 evbarm
Architecture: earm
Machine: evbarm

I found a  /dhcpcd.core file on this machine, date around the last time it
rebooted. There is a working dhcpcd process still running and no obvious

This machine has / on NFS and netboots, rc.conf has:

dhcpcd=YES dhcpcd_flags="-6"

gdb is pretty useless:

Core was generated by `dhcpcd'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x0002a5b0 in dhcp6_makemessage (ifp=0x0)
    at /work/src/external/bsd/dhcpcd/dist/src/dhcp6.c:693
693     /work/src/external/bsd/dhcpcd/dist/src/dhcp6.c: No such file or directory.
(gdb) bt
#0  0x0002a5b0 in dhcp6_makemessage (ifp=0x0)
    at /work/src/external/bsd/dhcpcd/dist/src/dhcp6.c:693
#1  0x00000002 in ?? ()



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