Re: [Devil-linux-develop] BGP, Quagga crash and long 4-byte ASN path

[Heiko Z. <he...@zu...>]

Thanks for the information.
I downloaded the patch and will upload it to the build system with my  
next check in.

Heiko

Quoting Andrzej Odyniec <an...@ma...>:

> Hi,
>
> Now last 0.99.11 Quagga is practically unusable, because now is in broadcast
> prefix with very long path of 4-byte ASN path. When this prefix is received,
> bgpd (last, 0.99.11, in 1.4RC1) crashes like this:
>
>> 2009/05/03 19:27:30 notifications: BGP: BGPd 0.99.11-realms  
>> starting: vty@2605, bgp@<all>:179
>> 2009/05/03 19:27:35 errors: BGP: 195.187.251.225 [Error]  
>> bgp_read_packet error: Connection reset by peer
>> 2009/05/03 19:27:57 critical: BGP: Assertion `len < str_size'  
>> failed in file bgp_aspath.c, line 619, function aspath_make_str_count
>> 2009/05/03 19:27:57 critical: BGP: Backtrace for 14 stack frames:
>> 2009/05/03 19:27:57 critical: BGP: [bt 0]  
>> /usr/lib/libzebra.so.0(zlog_backtrace+0x34) [0x4f51e7ab]
>> 2009/05/03 19:27:57 critical: BGP: [bt 1]  
>> /usr/lib/libzebra.so.0(_zlog_assert_failed+0xb5) [0x4f51e947]
>> 2009/05/03 19:27:57 critical: BGP: [bt 2] /usr/sbin/bgpd [0x119ea440]
>> 2009/05/03 19:27:57 critical: BGP: [bt 3] /usr/sbin/bgpd [0x119ea4aa]
>> 2009/05/03 19:27:57 critical: BGP: [bt 4] /usr/sbin/bgpd [0x119ea4f5]
>> 2009/05/03 19:27:57 critical: BGP: [bt 5]  
>> /usr/lib/libzebra.so.0(hash_get+0x39) [0x4f513c4b]
>> 2009/05/03 19:27:57 critical: BGP: [bt 6] /usr/sbin/bgpd [0x119ebb63]
>> 2009/05/03 19:27:57 critical: BGP: [bt 7] /usr/sbin/bgpd [0x119a7144]
>> 2009/05/03 19:27:57 critical: BGP: [bt 8] /usr/sbin/bgpd [0x119c7e35]
>> 2009/05/03 19:27:57 critical: BGP: [bt 9]  
>> /usr/sbin/bgpd(bgp_read+0x438) [0x119c9317]
>> 2009/05/03 19:27:57 critical: BGP: [bt 10]  
>> /usr/lib/libzebra.so.0(thread_call+0x69) [0x4f50f5b5]
>> 2009/05/03 19:27:57 critical: BGP: [bt 11]  
>> /usr/sbin/bgpd(main+0x38c) [0x11997b05]
>> 2009/05/03 19:27:57 critical: BGP: [bt 12]  
>> /lib/libc.so.6(__libc_start_main+0x157) [0x4f1b1ff3]
>> 2009/05/03 19:27:57 critical: BGP: [bt 13] /usr/sbin/bgpd [0x11997521]
>
> and propagated via BGP addresses are absent in the Internet. After restart
> bgpd starts new sessions, obtain this ugly prefix again and again crashes
> immediatelly.
>
> I'm not sure, but seems as problem like this is present in other routing
> systems. After solving this problem in transit routers (i.e. via router
> replacement), this path is propagated to the next neibors and today  
> or tomorow
> can crash more BGP routers especially running Quagga.
>
> I solved this problem last night applying patch of Chris Caputo:
>
> https://www.caputo.com/foss/quagga-0.99.11-BGP-4-byte-ASN-bug-fixes.patch
>
> on the file bgpd/bgp_aspath.c
>
> After this my bgpd is working correctly. In my case this is working  
> today from
> 3:30 CET and don't crashes again.
>
> I suggest to connect this patch to bgp patches for now, until guys  
> from Quagga
> don't correct this problem --- or Devil-Linux as BGP router will be unusable.
>
> Best Regards
>
> --
> Andrzej Odyniec
>
> <an...@ma...>
> Rada Nadzorcza Macrologic SA
> ul. Chroscickiego 49, 02-414 Warszawa
> tel. +48(22)8637681x132, fax: +48(22)8639861
> ul. Jagiellonska 36, 03-719 Warszawa
> tel. +48(22)5118115, fax: +48(22)5118117
>
>
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-- 

Regards
   Heiko Zuerker
   http://www.devil-linux.org


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