Hello Veiko,

On Mon, 1 Jul 2019 at 12:12, Veiko Kukk <vk...@xvidservices.com> wrote:
>
> Hi
>
> Sometimes (infrequently) all external checks hang and time out:
> * Has happened with versions 1.9.4 and 1.9.8 on multiple servers with
> nbproc 1 and nbthread set to (4-12) depending on server.
> * Happens infrequently, last one happened after 10 days of uptime.
> * External checks are written in python and write errors into their own
> log file directly. When hanging happens, nothing is logged by external
> check.
> * Only external checks fail, common 'option httpcheck' does not fail at
> the same time.

External checks are not thread-safe, that's a bug.

Could you try the suggest patch in:

https://github.com/haproxy/haproxy/issues/140#issuecomment-507119534


Thanks,
Lukas

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