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Bug 684930

Summary: sys-kernel/gentoo-sources-5.0.x ssh IPv6 session hang on dual stack system
Product: Gentoo Linux Reporter: Stefan Trenker <strenker>
Component: Current packagesAssignee: Gentoo Kernel Bug Wranglers and Kernel Maintainers <kernel>
Status: UNCONFIRMED ---    
Severity: normal    
Priority: Normal    
Version: unspecified   
Hardware: AMD64   
OS: Linux   
Package list:
Runtime testing required: ---
Attachments: Kernel .config file
IPv6 privacy settings
emerge --info
kernel log

Description Stefan Trenker 2019-05-02 13:47:25 UTC
Created attachment 574932 [details]
Kernel .config file

I am running a PC on sys-kernel/gentoo-sources-5.0.10. I need at least a 4.20.x kernel to support the quite new Intel Core i5-9600K CPU build in graphics. But 4.20 is end of development.

The system runs IPv4 and IPv6 in a dual stack configuration.

Since i have changed to 5.0.x SSH IPv6 sessions terminating at this PC hang after a few minutes. When I boot a 4.20 kernel everything is fine, when i reboot to 5.0.x SSH (and rsync) via IPv6 hang after a while. 

I have no idea how to track this down. There are no findings in syslog or dmesg.

A change from openssl 0.9.8 to 1.1.0 did not show any difference.
Comment 1 Stefan Trenker 2019-05-02 13:48:52 UTC
Created attachment 574934 [details]
IPv6 privacy settings
Comment 2 Stefan Trenker 2019-05-02 13:49:24 UTC
Created attachment 574936 [details]
emerge --info
Comment 3 Stefan Trenker 2019-05-02 14:48:04 UTC
Created attachment 574950 [details]
kernel log