Traffic stops accepting connections on certain entryPoints after running for about a week

Traefik Traefik v2
1

Hi! I have a problem that traefik seems to stop listening to random entry points after days of working just fine. A restart (without ANY configuration change or reboot of any other system or application) fixes the issue immediately, only for it to reappear days later.
Config looks somewhat like this, but I do not know if that helps at all:

[log]
  level = "DEBUG"
[accessLog]

[entryPoints]
  [entryPoints.localonly]
    address = ":8081"
  [entryPoints.web]
    address = ":80"
  [entryPoints.devAuth]
    address = ":90"
  [entryPoints.devSecure]
    address = ":91"
  [entryPoints.websecure]
    address = ":443"

[certificatesResolvers.letsencrypt.acme]
  email = "usrname@domain.tld"
  storage = "acme.json"
  [certificatesResolvers.letsencrypt.acme.httpChallenge]
    entryPoint = "web"

[providers.file]
  directory = "./dyn"

[api]
  dashboard = true

And I am running the traefik binary

Version:      2.4.8
Codename:     livarot
Go version:   go1.16.2
Built:        2021-03-23T15:48:39Z
OS/Arch:      darwin/amd64

I can really not give much more info, that's why my primary goal/question with this post is: How can I get more information on this bug/problem? It is obviously very frustrating to test, since it takes very long for the issue to occur. As I said earlier, even on log level DEBUG I could not find anything relevant. It just logs the requests from the entry points that still work.

2

This issue seems relevant: Traefik web entrypoint dies randomly · Issue #8071 · traefik/traefik · GitHub

3

Oh! Actually there is something in the logs. My search tool just stopped searching after a few thousand log entries. Embarrassing.
The relevant log excerpt is here (I have included the previous and next unrelated message to show that there is indeed no further info)

121.196.15.242 - - [06/Apr/2021:06:31:05 +0000] "POST /vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php HTTP/1.1" 404 25 "-" "-" 3679 "HouseControl@file" "http://192.168.1.19/" 2ms
ERRO[2021-04-06T08:31:05+02:00] set tcp [::c0a8:117]:80->121.196.15.242:38628: setsockopt: invalid argument  entryPointName=web
ERRO[2021-04-06T08:31:05+02:00] Error while starting server: set tcp [::c0a8:117]:80->121.196.15.242:38628: setsockopt: invalid argument  entryPointName=web
ERRO[2021-04-06T08:31:05+02:00] Error while starting server: set tcp [::c0a8:117]:80->121.196.15.242:38628: setsockopt: invalid argument  entryPointName=web
DEBU[2021-04-06T08:32:24+02:00] URL.Path is now /vwid3//carStatus.php (was //carStatus.php).  middlewareName=dev-idddatalogger-qualifier@file middlewareType=AddPrefix
DEBU[2021-04-06T08:32:24+02:00] vulcand/oxy/roundrobin/rr: begin ServeHttp on request  Request="{\"Method\":\"GET\",\"URL\":{\"Scheme\":\"\",\"Opaque\":\"\",\"User\":null,\"Host\":\"\",\"Path\":\"/vwid3//carStatus.php\",\"RawPath\":\"\",\"ForceQuery\":false,\"RawQuery\":\"key=REDACTED\",\"Fragment\":\"\",\"RawFragment\":\"\"},\"Proto\":\"HTTP/2.0\",\"ProtoMajor\":2,\"ProtoMinor\":0,\"Header\":{\"Accept\":[\"*/*\"],\"Accept-Encoding\":[\"gzip, deflate, br\"],\"Accept-Language\":[\"en-gb\"],\"User-Agent\":[\"Scriptable/177 CFNetwork/1220.1 Darwin/20.3.0\"],\"X-Forwarded-Host\":[\"dev.id3.srv.ti.domain.de\"],\"X-Forwarded-Port\":[\"443\"],\"X-Forwarded-Proto\":[\"https\"],\"X-Forwarded-Server\":[\"some-iMac\"],\"X-Real-Ip\":[\"192.168.178.1\"]},\"ContentLength\":0,\"TransferEncoding\":null,\"Host\":\"dev.id3.srv.ti.domain.de\",\"Form\":null,\"PostForm\":null,\"MultipartForm\":null,\"Trailer\":null,\"RemoteAddr\":\"192.168.178.1:63730\",\"RequestURI\":\"/vwid3//carStatus.php?key=REDACTED\",\"TLS\":null}"

After that log entry (which occurred 2 days after starting), no further requests are handled on the web entrypoint.

4

Does anyone have any idea how to mitigate this? Even having traefik really crash when this occurs so it can restart would be better than it silently half-dieing.