Fwd: 1.17.5 regression

Gábor Boskovits boskovits at gmail.com
Wed Dec 18 17:35:35 UTC 2019

Hello Maxim,

Maxim Dounin <mdounin at mdounin.ru> ezt írta (időpont: 2019. dec. 18.,
Sze, 18:24):
> Hello!
> On Mon, Dec 16, 2019 at 03:02:37PM +0100, Gábor Boskovits wrote:
> > On berlin.guix.gnu.org we observed a regression upon upgrading nginx
> > to 1.17.5. The problem was, when pipelining request to a proxy using
> > tls, we suddenly started to get 408 client timeouts, manifesting in
> > dropped connections. Currently we worked around the issue by
> > downgrading to 1.17.4. I have collected some information about the
> > problem here:
> > https://gitlab.com/g_bor/fix-nginx-tls
> > It contains the logs from the good and the bad version, a full nginx
> > config, some info about how nginx was built. I managed to bisect the
> > problem down to changeset 9d2ad2fb4423, which introduced the problem.
> > Any help in further debuggin this would be greatly appreciated.
> Thanks for the report, it indeed looks like a bug introduced
> in 9d2ad2fb4423.
> The problem is that c->read->handler is overwritted when switching
> to the next pipelined request, ngx_ssl_next_read_handler() is not
> called, and c->read->ready remains not set.  I'll take a look how
> to fix it properly.

Thanks for having a look.

Please keep me updated when the fix gets applied.

> Note well that a simpler workaround might be to build nginx with
> the --with-cc-opt="-DNGX_HAVE_FIONREAD=0" configure argument, this
> will disable the code in question on systems not using kqueue.

Thanks for the information, we do not yet support any systems with kqueue yet,
so this might work temporarily.

> --
> Maxim Dounin
> http://mdounin.ru/
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Best regards,
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