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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: RESOLVED FIXED    
Severity: normal    
Priority: Normal    
Version: unspecified   
Hardware: AMD64   
OS: Linux   
Whiteboard:
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
Comment 4 Mike Pagano gentoo-dev 2020-01-18 20:02:10 UTC
Is this still an issue?
Comment 5 Stefan Trenker 2020-01-18 22:16:18 UTC
(In reply to Mike Pagano from comment #4)
> Is this still an issue?

No, it's no longer an issue. The problem vanished with 5.2 and I believe it was related to IPv6 privacy settings and expiration of the source address during active ssh sessions.

I have now changed my setup from IPv6 stable-privacy (default with NetworkManager) to EUI64 combined with IPv6 privacy and a long valid lifetime.

I appologize that i have forgotten to follow up this bugzilla.
Comment 6 Mike Pagano gentoo-dev 2020-01-18 23:23:11 UTC
(In reply to Stefan Trenker from comment #5)
> (In reply to Mike Pagano from comment #4)
> > Is this still an issue?
> 
> No, it's no longer an issue. The problem vanished with 5.2 and I believe it
> was related to IPv6 privacy settings and expiration of the source address
> during active ssh sessions.
> 
> I have now changed my setup from IPv6 stable-privacy (default with
> NetworkManager) to EUI64 combined with IPv6 privacy and a long valid
> lifetime.
> 
> I appologize that i have forgotten to follow up this bugzilla.

No worries. Thanks for responding.