Wind River Support Network


LIN6-10463 : HU30115 Vlan interface refcount leak in Linux kernel

Created: Oct 28, 2015    Updated: Dec 3, 2018
Resolved Date: Oct 30, 2015
Found In Version:
Fix Version:
Severity: Standard
Applicable for: Wind River Linux 6
Component/s: Kernel


New ticket 
We occasionally trigger what seems to be a known kernel bug in the reference count handling of VLAN interfaces. A PMD is generated, see enclosed file, which shows this message in the syslog/dmesg log: 

<0>[ 7921.630591] unregister_netdevice: waiting for eth10.170 to become free. Usage count = 2 

When this bug is triggered our dpsd process hangs which causes the kernel to panic. 

This patch, submitted to Linux 3.10.72, will probably resolve the issue: 

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