Keepalived v1.2.7 Error : Keepalived_vrrp cant do IP_DROP_MEMBERSHIP errno=Bad file descriptor (9)

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There are errors when reload keepalived in /var/log/messages :
    Jan 25 10:47:35 localhost Keepalived_vrrp[25510]: cant do
IP_DROP_MEMBERSHIP errno=Bad file descriptor (9)

# keepalived -v
  Keepalived v1.2.7 (01/25,2013)

./configure --prefix=/usr --sysconfdir=/etc --enable-lvs --enable-lvs-syncd
--enable-vrrp
--with-kernel-dir=/lib/modules/2.6.32-279.19.2.el6.x86_64/build

# Keepalived configuration
------------------------
Keepalived version       : 1.2.7
Compiler                 : gcc
Compiler flags           : -g -O2
Extra Lib                : -lpopt -lssl -lcrypto  -lnl
Use IPVS Framework       : Yes
IPVS sync daemon support : Yes
IPVS use libnl           : Yes
Use VRRP Framework       : Yes
Use VRRP VMAC            : Yes
SNMP support             : No
Use Debug flags          : No


CentOS release 6.3 Linux 2.6.32-279.19.2.el6.x86_64 #1 SMP Wed Jan 9
19:10:26 CST 2013 x86_64 x86_64 x86_64 GNU/Linux

Then I test on Version 1.2.2 ,1.2.6 , 1.2.7 , I found 1.2.2 hasn't this
error.
Which I write it on my blog page:
http://hi.baidu.com/higkoo/item/eacc58b46b9c2ce84fc7fdea

Anyone know ?

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<div dir=3D"ltr"><div>There are errors when reload keepalived in /var/log/m=
essages :</div><div>=A0 =A0 Jan 25 10:47:35 localhost Keepalived_vrrp[25510=
]: cant do IP_DROP_MEMBERSHIP errno=3DBad file descriptor (9)</div><div><br=
></div>
<div><div># keepalived -v</div><div>=A0 Keepalived v1.2.7 (01/25,2013)</div=
></div><div><br></div><div>./configure --prefix=3D/usr --sysconfdir=3D/etc =
--enable-lvs --enable-lvs-syncd --enable-vrrp --with-kernel-dir=3D/lib/modu=
les/2.6.32-279.19.2.el6.x86_64/build<br>
</div><div><br></div><div><div># Keepalived configuration</div><div>-------=
-----------------</div><div>Keepalived version =A0 =A0 =A0 : 1.2.7</div><di=
v>Compiler =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 : gcc</div><div>Compiler flags =
=A0 =A0 =A0 =A0 =A0 : -g -O2</div>
<div>Extra Lib =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0: -lpopt -lssl -lcrypto =A0-l=
nl</div><div>Use IPVS Framework =A0 =A0 =A0 : Yes</div><div>IPVS sync daemo=
n support : Yes</div><div>IPVS use libnl =A0 =A0 =A0 =A0 =A0 : Yes</div><di=
v>Use VRRP Framework =A0 =A0 =A0 : Yes</div>
<div>Use VRRP VMAC =A0 =A0 =A0 =A0 =A0 =A0: Yes</div><div>SNMP support =A0 =
=A0 =A0 =A0 =A0 =A0 : No</div><div>Use Debug flags =A0 =A0 =A0 =A0 =A0: No<=
/div></div><div><br></div><div><br></div><div>CentOS release 6.3=A0Linux 2.=
6.32-279.19.2.el6.x86_64 #1 SMP Wed Jan 9 19:10:26 CST 2013 x86_64 x86_64 x=
86_64 GNU/Linux<br>
</div><div><br></div><div><div>Then I test on Version 1.2.2 ,1.2.6 , 1.2.7 =
, I found 1.2.2 hasn&#39;t this error.</div><div>Which I write it on my blo=
g page: <a href=3D"http://hi.baidu.com/higkoo/item/eacc58b46b9c2ce84fc7fdea=
">http://hi.baidu.com/higkoo/item/eacc58b46b9c2ce84fc7fdea</a></div>
<div><br></div><div>Anyone know ?</div></div><div><br></div></div>

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