IPv6 BGP debugging

[Peter Andreev]

2014-04-10 11:35 GMT+04:00 Alexander V. Chernikov <melifaro at freebsd.org>:

> On 10.04.2014 10:14, Peter Andreev wrote:
> > Hi Alexander,
> >
> > I tried "debug MLPA1 all" from birdc console, but nothing new appeared
> > in log file.
> Interesting.
> >
> > Currently I rolled back to 1.3.10 version from ports because 1.4.2
> > started to crash with the following backtrace:
> >
> >
> > GNU gdb 6.1.1 [FreeBSD]
> > Copyright 2004 Free Software Foundation, Inc.
> > GDB is free software, covered by the GNU General Public License, and you
> are
> > welcome to change it and/or distribute copies of it under certain
> > conditions.
> > Type "show copying" to see the conditions.
> > There is absolutely no warranty for GDB.  Type "show warranty" for
> details.
> > This GDB was configured as "amd64-marcel-freebsd"...
> > Core was generated by `bird6'.
> > Program terminated with signal 11, Segmentation fault.
> > Reading symbols from /lib/libthr.so.3...done.
> > Loaded symbols for /lib/libthr.so.3
> > Reading symbols from /lib/libc.so.7...done.
> > Loaded symbols for /lib/libc.so.7
> > Reading symbols from /libexec/ld-elf.so.1...done.
> > Loaded symbols for /libexec/ld-elf.so.1
> > #0  0x0000000000464a9e in add_tail (l=0x801017798, n=0x80102a650) at
> > lists.c:46
> > 46      z->next = n;
> > [New Thread 801007400 (LWP 100292/bird6)]
> > (gdb) bt
> > #0  0x0000000000464a9e in add_tail (l=0x801017798, n=0x80102a650) at
> > lists.c:46
> > #1  0x0000000000469ce6 in ralloc (p=0x801017780, c=0x692260) at
> > resource.c:224
> > #2  0x000000000045c20a in tm_new (p=0x801017780) at io.c:226
> > #3  0x0000000000425bef in bgp_setup_conn (p=0x801008020,
> > conn=0x8010081c8) at ../../../proto/bgp/bgp.c:631
> > #4  0x0000000000425d97 in bgp_active (p=0x801008020) at
> > ../../../proto/bgp/bgp.c:660
> > #5  0x00000000004252cb in bgp_decision (vp=0x801008020) at
> > ../../../proto/bgp/bgp.c:334
> > #6  0x000000000045bd67 in ev_run (e=0x801017800) at event.c:85
> > #7  0x000000000045be02 in ev_run_list (l=0x694aa0) at event.c:135
> > #8  0x000000000045f05f in io_loop () at io.c:1716
> > #9  0x00000000004669b3 in main (argc=3, argv=0x7fffffffdb20) at
> main.c:820
> > (gdb) quit
> >
> >
> > If this crash is interesting to you as port maintainer, I will provide
> > any additional information which can help to understand why it happened.
> Yes, definitely.
>
> Can you provide me with config, core file and a binary?
>

Ok. I'll send in private message.


> Is this stock bird from 1.4.2, default options, no patches?
>

Stock bird, default options.


> Do you using gcc or clang to build and which version?
>

/home/apn>cc -v
Using built-in specs.
Target: amd64-undermydesk-freebsd
Configured with: FreeBSD/amd64 system compiler
Thread model: posix
gcc version 4.2.1 20070831 patched [FreeBSD]


>
> How can one reproduce this scenario?
>

My rc.conf:

vlans_em2="10 20"
ifconfig_em2_10="<some_ip>"
ifconfig_em2_20_ipv6="<some_v6_ip>"
ifconfig_em2="up"


> Does the same config work on 1.3.10?
>

1.3.10 doesn't crash, but BGP sessions don't set up.


>
> >
> > 2014-04-09 23:10 GMT+04:00 Alexander V. Chernikov <melifaro at freebsd.org
> > <mailto:melifaro at freebsd.org>>:
> >
> >     On 09.04.2014 13:36, Peter Andreev wrote:
> >     > Hi everybody,
> >
> >     Hello!
> >     >
> >     > I'm trying to set up bird 1.4.2 on FreeBSD 9.1 and stuck on the
> >     > following:
> >     >
> >     > bird> sh pro name     proto    table    state  since       info
> >     > kernel1  Kernel   master   up     13:10:06 device1  Device   master
> >     > up     13:10:06 NICbr1   BGP      master   up     13:10:28
> >     > Established NICbr2   BGP      master   up     13:10:29
> >     > Established PTTlg    BGP      master   start  13:10:24    Connect
> >     > Socket: Invalid argument MLPA1    BGP      master   start  13:10:24
> >     > Connect       Socket: Operation timed out MLPA2    BGP      master
> >     > start  13:10:24    Connect       Socket: Invalid argument MLPA3
> >     > BGP      master   start  13:12:51    OpenConfirm   BGP Error: Hold
> >     > timer expired MLPA4    BGP      master   start  13:10:24    Connect
> >     > Socket: Invalid argument STATIC_BGP Static   master   up
> >     > 13:10:06
> >     >
> >     > All these BGP protocols are inherited from one template. The only
> >     > difference is that those are established, use another source
> >     > address which is configured on virtual interface.
> >     >
> >     > However my question is how to find out what's going on and how to
> >     > detect a problem? Setting "log syslog all;" is not very helpful -
> >     > it only fills the log file with a lot of "bird6: KRT: Error sending
> >     > route 2c0f:fb50::/0 to kernel: No such process" messages.
> >     You can look at detailed protocol status via
> >     "show protocol [nam] all"
> >     You can enable appropriated level of per-protocol debug (e.g. add
> >     "debug { events, states };" to protocol config.
> >
> >     >
> >     > -- Is there any problem Exterminatus cannot solve? I have not found
> >     > one yet.
> >     >
> >
> >
> >
> >
> > --
> > Is there any problem Exterminatus cannot solve? I have not found one yet.
> >
>
>


-- 
Is there any problem Exterminatus cannot solve? I have not found one yet.
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