[FS#3690] 6in4 interfaces creation sometimes stuck in an infinite loop

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - LGA1150 (LGA1150) 

Attached to Project - OpenWrt/LEDE Project
Summary - 6in4 interfaces creation sometimes stuck in an infinite loop
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Router: Linksys WRT1900AC v2
OpenWrt version: SNAPSHOT r16134-c6652a7c94
netifd version: 2021-01-09-c00c8335-1

I have set up multiple 6in4 interfaces for testing, but sometimes some interface won't come up.
The system log is flooded with errors like these:

Fri Mar 19 20:32:58 2021 daemon.notice netifd: Interface 'wan6_4' is setting up now
Fri Mar 19 20:32:58 2021 daemon.notice netifd: wan6_4 (13717): Command failed: Unknown error
Fri Mar 19 20:32:58 2021 daemon.notice netifd: Interface 'wan6_4' is now down
Fri Mar 19 20:32:58 2021 daemon.notice netifd: Interface 'wan6_4' is setting up now
Fri Mar 19 20:32:58 2021 daemon.notice netifd: wan6_4 (13770): Command failed: Unknown error
Fri Mar 19 20:32:58 2021 daemon.notice netifd: Interface 'wan6_4' is now down
Fri Mar 19 20:32:58 2021 daemon.notice netifd: Interface 'wan6_4' is setting up now
Fri Mar 19 20:32:58 2021 daemon.notice netifd: wan6_4 (13794): Command failed: Unknown error
Fri Mar 19 20:32:58 2021 daemon.notice netifd: Interface 'wan6_4' is now down
Fri Mar 19 20:32:58 2021 daemon.notice netifd: Interface 'wan6_4' is setting up now
Fri Mar 19 20:32:58 2021 daemon.notice netifd: wan6_4 (13847): Command failed: Unknown error
Fri Mar 19 20:32:58 2021 daemon.notice netifd: Interface 'wan6_4' is now down
Fri Mar 19 20:32:58 2021 daemon.notice netifd: Interface 'wan6_4' is setting up now
Fri Mar 19 20:32:58 2021 daemon.notice netifd: wan6_4 (13871): Command failed: Unknown error
Fri Mar 19 20:32:58 2021 daemon.notice netifd: Interface 'wan6_4' is now down


And it also hogs CPU.

An workaround is manually remove the tunnel with iproute2, then restart the interface:

ip tun del 6in4-wan6_4
ifup wan6_4



More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3690

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