Thank you Alex for confirming this and all the hints given.
I have taken another path to fix this. I have configured the dns
forwarders that squid is configured to use, to not give out any AAAA
responses. After that I have enabled IPv6 on this box to completly avoid
this bug. Thank you!
---
Best regards,
Flashdown
Am 2023-09-14 16:11, schrieb Alex Rousskov:
On 2023-09-14 07:02, Flashdown wrote:
Sep 14 08:55:06 vm-myproxy squid[79100]: Squid Parent: squid-2 process
80675 exited due to signal 6 with status 0
1694674498.411 9 **CENSORED_internal_client_IP** TCP_DENIED/407
4129 CONNECT [ff00::]:443 - HIER_NONE/- text/html
IPv6 is disabled via sysctl config "net.ipv6.conf.all.disable_ipv6=1"
Your Squid is most likely suffering (among other v5 bugs) from Squid
Bug 5154: https://bugs.squid-cache.org/show_bug.cgi?id=5154
To confirm, enable core dumps and look for a gdb backtrace sequence
similar to the one posted in the above bug report:
* in __assert_fail
* in Ip::Address::getAddrInfo(addrinfo*&, int) const
* in comm_openex(int, int, Ip::Address&, int, char const*)
The best known way to prevent bug 5154 is to enable IPv6 support. If
that is not feasible in your environment, then please keep reading.
Squid bug 5154 has an unofficial but, IMO, correct fix at PR 1421:
https://github.com/squid-cache/squid/pull/1421
The above fix is not trivial and has side effects: For Squids that
cannot handle IPv6 (e.g., because IPv6 support was disabled at
./configure time or is unavailable in the deployment environment), the
fix will, in part, reject requests with IPv6 addresses in URLs. This
rejection may negatively affect Squids that were "worked OK" by
forwarding such traffic to IPv4 ICAP servers and cache_peers (at
least).
PR 1421 changes cannot be applied to Squid v5 "as is"; they have to be
backported. I do not have a backporting patch for virgin Squid v5.
HTH,
Alex.
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