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http://bugzilla.kernel.org/show_bug.cgi?id=6295
Summary: unregister_netdevice loops indefinitely when bringing
down an interface if static ARP entries are present
Kernel Version: 2.6.16
Status: NEW
Severity: normal
Owner: [EMAIL PROTECTED]
Submitter: [EMAIL PROTECTED]
Most recent kernel where this bug did not occur: 2.6.8
Distribution: Debian unstable, bug reproduced with vanilla kernel from
kernel.org
Problem Description:
When using a VPN client, such as openvpn or gvpe, killing the client (which
should result in bringing down of the VPN interface) deadlocks it in D+ state,
if static ARP entries are present for the interface. Kernel periodically emits
messages "unregister_netdevice: waiting for <interface> to become free. Usage
count = 1". The usage count number is equal to the number of the static ARP
entries.
Thanks a lot to Marc Lehmann for patient debugging of this problem and
constructing the test case.
Steps to reproduce (using openvpn, all mentioned addresses are non-existent):
# modprobe tun
# openvpn --remote 192.168.1.111 --dev tun1 --ifconfig 10.0.0.1 10.0.0.2
In another console:
# ip neigh add to 10.0.0.3 dev tun1 nud permanent
Return to the console in which openvpn is running and press Ctrl-C. The openvpn
process hangs in D+ state (can't be killed), error messages mentioned above are
periodically produced on the console.
Best regards,
Jurij Smakov [EMAIL PROTECTED]
Key: http://www.wooyd.org/pgpkey/ KeyID: C99E03CC
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