On 2018/09/19 00:16, Stuart Henderson wrote:
> On 2018/09/18 19:12, Aaron A. Glenn wrote:
> >
> > Experiencing an odd issue with only IPv6 sessions, on snapshots from Sept.
> > 9th
> > or later. I have 46 other instances running snapshots from Aug 30th to Sept.
> > 3rd with IPv6 sessions working as expected.
> >
> > Please let me know what, if any, additional information can be provided.
>
> bgpd development has been pretty active recently and there are maybe as
> many as 30 commits in the window depending on when the actual checkouts
> were done for the snapshots. Seems you can reproduce it pretty easily?
> If you're able to do date-based checkouts and build/run to narrow down
> the range when it was introduced, that would be helpful,
>
> $ cd /usr/src
/usr/src/usr.sbin, even.
> $ TZ=UTC cvs up -D "2018/09/04 00:00:00" up -PdA bgpd bgpctl
> $ for i in bgpd bgpctl; (cd $i && make obj && make && doas make install); done
Oh, do this instead to get debug symbols -
$ for i in bgpd bgpctl; (cd $i && make obj && make clean && make DEBUG=-g &&
doas make install DEBUG=-g); done
And
# sysctl kern.nosuidcoredump=3
# mkdir -p /var/crash/bgpd
(you might also need /var/empty/var/crash/bgpd, I'm not 100% sure)
Maybe you will get a coredump that gives a useful backtrace ("gdb
/usr/sbin/bgpd /var/crash/bgpd/$PID.core").
>
> Purely based on numbers of commits between them, I'd suggest trying these
> dates
> working forwards:
>
> 2018/09/04 00:00:00
> 2018/09/05 00:00:00
> 2018/09/06 00:00:00
> 2018/09/07 12:00:00
> 2018/09/08 10:30:00
> 2018/09/09 15:00:00
> 2018/09/10 00:00:00
>
> Nothing jumps out as being particularly more likely than others from
> reading so far (though I have been looking at a lot of commit logs and
> cvs diffs in bgpd over the last few days and it is starting to get a bit
> blurry by now ;)
>
> If it starts off OK and then you hit a non-working one, look at commit log
> timestamps (I normally use cvsps from packages; I recommend forcing TZ
> when you're doing this type of thing to avoid confusion, try "TZ=UTC
> cvsps -d 2018/09/01") and work backwards (date-based checkout to e.g.
> a minute before each commit) until you find one when it starts working
> again.
>
> Note, I've chosen the above dates to avoid the short range where commas
> are banned in prefix-sets, but if you end up having to narrow down to between
> 2018/09/08 10:30:00 and 2018/09/09 15:00:00 you will need to remove them in
> your config.
>
> (If you're more familiar with git you could use that instead with
> github/openbsd/src, but it's something of a pain with this sort of bisection
> because you have to update the whole of /usr/src each time rather than
> a handful of files.)
>
