[dpdk-dev] [PATCH v3] vhost: fix connect hang in client mode

Thomas Monjalon thomas.monjalon at 6wind.com
Fri Jul 22 00:21:27 CEST 2016


2016-07-21 21:35, Yuanhan Liu:
> On Thu, Jul 21, 2016 at 04:19:35PM +0300, Ilya Maximets wrote:
> > If something abnormal happened to QEMU, 'connect()' can block calling
> > thread (e.g. main thread of OVS) forever or for a really long time.
> > This can break whole application or block the reconnection thread.
> > 
> > Example with OVS:
> > 
> > 	ovs_rcu(urcu2)|WARN|blocked 512000 ms waiting for main to quiesce
> > 	(gdb) bt
> > 	#0  connect () from /lib64/libpthread.so.0
> > 	#1  vhost_user_create_client (vsocket=0xa816e0)
> > 	#2  rte_vhost_driver_register
> > 	#3  netdev_dpdk_vhost_user_construct
> > 	#4  netdev_open (name=0xa664b0 "vhost1")
> > 	[...]
> > 	#11 main
> > 
> > Fix that by setting non-blocking mode for client sockets for connection.
> > 
> > Fixes: 64ab701c3d1e ("vhost: add vhost-user client mode")
> > 
> > Signed-off-by: Ilya Maximets <i.maximets at samsung.com>
> 
> Acked-by: Yuanhan Liu <yuanhan.liu at linux.intel.com>

Applied, thanks


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