mtr segfaults

[traviscross]

mtr segfaults

[dkorzhevin]

Seems, mtr doesn't work with IPv6 as expected..

ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.21.0.116 netmask 255.255.255.0 broadcast 172.21.0.255
inet6 fe80::1ec1:deff:fe0b:17d8 prefixlen 64 scopeid 0x20
inet6 2a02:2278:70eb:101:1ec1:deff:fe0b:17d8 prefixlen 64 scopeid 0x0
ether 1c:c1🇩🇪0b:17:d8 txqueuelen 1000 (Ethernet)
RX packets 1572745 bytes 2138243687 (1.9 GiB)
RX errors 0 dropped 3290 overruns 0 frame 0
TX packets 792803 bytes 71035457 (67.7 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 0 (Local Loopback)
RX packets 1832 bytes 63518 (62.0 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1832 bytes 63518 (62.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

In error i see, that mtr crash after request to localhost IPv6 loopback: localhost (::)

Will dig more..

[rewolff]

Hi,
When you straced the mtr command, it failed to get a raw socket. Either you didn't make it setuid at all, or the strace wasn't run as "root". You need to run the strace as root, because otherwise the system will refuse to let mtr get a raw socket.

[dkorzhevin]

Please, look at https://gist.github.com/anonymous/5575021

This is result of command executed from root (not sudo):

LANG=C strace -Ff -tt mtr mirohost.net 2>&1 | tee strace-mtr.log

[danners]

i also got a crash on arch and looked more into it:
it seems that the source archive from ftp://ftp.bitwizard.nl/mtr/mtr-0.84.tar.gz which arch uses to build its package doesn't include the bugfix (commit cece39e). If i apply the changes, i can use mtr again.

[rewolff]

Around the 0.84 release, I had trouble keeping git and the "releases" in sync. Sorry for the trouble.
Let's consider this fixed. OK?