[Olsr-dev] OLSRd SegFault
Ferry Huberts
(spam-protected)
Wed Apr 20 23:14:33 CEST 2016
On 20/04/16 22:25, Gabriel wrote:
>
> On 20/04/2016 21:49, Ferry Huberts wrote:
>> Please give me more info so that I can try to reproduce it.
>>
>> How did you compile?
> I compiled it locally on the machine, i've tryied a couple of times.
> These are the commands i use:
>
> git clone https://github.com/OLSR/olsrd.git
> cd olsrd
> make
> make libs
> make install
> make install_libs
>
>
>> How did you run?
>
> /usr/local/sbin/olsrd -f /etc/olsrd/olsrd.conf.netjson
>
>
>> What do your interface look like (ifconfig)?
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> inet 127.0.0.1/8 scope host lo
> valid_lft forever preferred_lft forever
> inet6 fdc0:ffee::10:150:25:1/128 scope global
> valid_lft forever preferred_lft forever
> inet6 ::1/128 scope host
> valid_lft forever preferred_lft forever
> 2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
> master br0 state DOWN
> link/ether 04:18:d6:31:37:9f brd ff:ff:ff:ff:ff:ff
> 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
> UNKNOWN
> link/ether 04:18:d6:31:37:a0 brd ff:ff:ff:ff:ff:ff
> inet6 fe80::618:d6ff:fe31:37a0/64 scope link
> valid_lft forever preferred_lft forever
> 4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
> UNKNOWN
> link/ether 04:18:d6:31:37:a1 brd ff:ff:ff:ff:ff:ff
> inet 150.***.***.***/24 brd 150.***.***.255 scope global eth2
> valid_lft forever preferred_lft forever
> inet6 fe80::618:d6ff:fe31:37a1/64 scope link
> valid_lft forever preferred_lft forever
> 5: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
> link/ether 04:18:d6:31:37:9f brd ff:ff:ff:ff:ff:ff
> inet 10.150.25.1/24 brd 10.150.25.255 scope global br0
> valid_lft forever preferred_lft forever
> inet6 fe80::9850:fcff:febf:9894/64 scope link
> valid_lft forever preferred_lft forever
> 6: (spam-protected): <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
> state UP
> link/ether 04:18:d6:31:37:a0 brd ff:ff:ff:ff:ff:ff
> inet 172.19.189.3/16 brd 172.19.255.255 scope global eth1.4
> valid_lft forever preferred_lft forever
> inet6 fe80::618:d6ff:fe31:37a0/64 scope link
> valid_lft forever preferred_lft forever
> 7: (spam-protected): <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
> state UP
> link/ether 04:18:d6:31:37:a0 brd ff:ff:ff:ff:ff:ff
> inet 172.19.189.2/16 brd 172.19.255.255 scope global eth1.3
> valid_lft forever preferred_lft forever
> inet6 fe80::618:d6ff:fe31:37a0/64 scope link
> valid_lft forever preferred_lft forever
> 8: (spam-protected): <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
> master br0 state UP
> link/ether 04:18:d6:31:37:a0 brd ff:ff:ff:ff:ff:ff
> inet6 fe80::618:d6ff:fe31:37a0/64 scope link
> valid_lft forever preferred_lft forever
> 9: (spam-protected): <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
> state UP
> link/ether 04:18:d6:31:37:a0 brd ff:ff:ff:ff:ff:ff
> inet 172.19.189.1/16 brd 172.19.255.255 scope global eth1.2
> valid_lft forever preferred_lft forever
> inet6 fe80::618:d6ff:fe31:37a0/64 scope link
> valid_lft forever preferred_lft forever
> 10: (spam-protected): <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
> noqueue state UP
> link/ether 04:18:d6:31:37:a0 brd ff:ff:ff:ff:ff:ff
> inet 172.19.189.4/16 brd 172.19.255.255 scope global eth1.5
> valid_lft forever preferred_lft forever
> inet6 fe80::618:d6ff:fe31:37a0/64 scope link
> valid_lft forever preferred_lft forever
>
>
>
>>
>> When does it crash? During startup?
>
> It crashes immediatly, but looking at the stdout it looks like it
> crashes after he interact with some peer.
>
> I've made a test only with br0 as interface and it doesn't crashes.
>
>
>
>>
>> It works fine for me.
>
> I think the key point is the MIPS architecture.
>
> 2 years ago I found a bug on this architecture.
> https://github.com/OLSR/olsrd/commit/f1db5724d04dc92866afe60858c344cc29b0b18e
I fail to see what that commit has to do with this problem
>
> It was causing a SegFault only on MIPS machines.
>
>
>
>>
>> Try to run with a debug version (DEBUG=1) and with -nofork.
>> If it crashes then repeat it using strace.
>
>
> This is the output of gdb backtrace
>
> IP addr (2-hop) IP addr (1-hop) Total cost
> Received MID from NON SYM neighbor 172.19.64.1
> Received MID from NON SYM neighbor 172.19.64.1
> Received HNA from NON SYM neighbor 172.19.64.1
> Received MID from NON SYM neighbor 172.19.64.1
> Received HNA from NON SYM neighbor 172.19.64.1
> Received HNA from NON SYM neighbor 172.19.64.1
> Adding 172.19.189.4=>172.19.64.1 to link set
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x00425844 in set_loss_link_multiplier (entry=0x4a4d08) at
> src/link_set.c:361
> 361 OLSR_PRINTF(1, "Set linkloss multiplier for %s on %s to %d\n",
that is weird, it crashes in the olsr_printf
Does the attached patch help?
> (gdb) bt
> #0 0x00425844 in set_loss_link_multiplier (entry=0x4a4d08) at
> src/link_set.c:361
> #1 0x004265a0 in add_link_entry (local=0x4a3474, remote=0x7fdff194,
> remote_main=0x7fdff050, vtime=20000, htime=2000, local_if=0x4a3408) at
> src/link_set.c:602
> #2 0x00426ce4 in update_link_entry (local=0x4a3474, remote=0x7fdff194,
> message=0x7fdff048, in_if=0x4a3408) at src/link_set.c:702
> #3 0x00440ee4 in olsr_hello_tap (message=0x7fdff048, in_if=0x4a3408,
> from_addr=0x7fdff194) at src/process_package.c:417
> #4 0x00440d70 in olsr_input_hello (ser=0x493a40, inif=0x4a3408,
> from=0x7fdff194) at src/process_package.c:385
> #5 0x0043d484 in parse_packet (olsr=0x4939b4, size=196, in_if=0x4a3408,
> from_addr=0x7fdff194) at src/parser.c:397
> #6 0x0043da90 in olsr_input (fd=11, data=0x0, flags=1) at src/parser.c:511
> #7 0x004460a0 in poll_sockets () at src/scheduler.c:382
> #8 0x00446b3c in olsr_scheduler () at src/scheduler.c:540
> #9 0x00430ab4 in main (argc=6, argv=0x7fdff934) at src/main.c:738
> (gdb)
>
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