From: Yuanhan Liu <yliu@fridaylinux.org>
To: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Cc: Maxime Coquelin <maxime.coquelin@redhat.com>,
dpdk stable <stable@dpdk.org>
Subject: [dpdk-stable] patch 'vhost: fix dead lock on closing in server mode' has been queued to LTS release 17.11.3
Date: Sun, 20 May 2018 21:02:33 +0800 [thread overview]
Message-ID: <20180520130246.16287-17-yliu@fridaylinux.org> (raw)
In-Reply-To: <20180520130246.16287-1-yliu@fridaylinux.org>
Hi,
FYI, your patch has been queued to LTS release 17.11.3
Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 05/27/18. So please
shout if anyone has objections.
Thanks.
--yliu
---
>From 01670e717dccf35c5678cd779a525cdc1561514b Mon Sep 17 00:00:00 2001
From: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Date: Fri, 27 Apr 2018 08:19:43 -0700
Subject: [PATCH] vhost: fix dead lock on closing in server mode
[ upstream commit 8b4b949144b80cc7312bbc189d38a3feaf2c74e5 ]
When qemu close the unix socket fd of the vhostuser as a
server, and then immediately delete the vhostuser port on
openvswitch. There will be a deadlock.
A thread (fdset event thread): B thread:
1. fdset_event_dispatch rte_vhost_driver_unregister
2. set the fd busy to 1. lock vsocket->conn_mutex
3. vhost_user_read_cb fdset_del waits busy changed to 0.
4. vhost peer closed, remove the
conn from vsocket->conn_list:
lock vsocket->conn_mutex
5. set the fd busy to 0
Fixes: 65388b43f592 ("vhost: fix fd leaks for vhost-user server mode")
Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
lib/librte_vhost/fd_man.c | 32 ++++++++++++++++++++++++++++++++
lib/librte_vhost/fd_man.h | 1 +
lib/librte_vhost/socket.c | 14 +++++++++++++-
3 files changed, 46 insertions(+), 1 deletion(-)
diff --git a/lib/librte_vhost/fd_man.c b/lib/librte_vhost/fd_man.c
index 4c6fed418..173ec75c8 100644
--- a/lib/librte_vhost/fd_man.c
+++ b/lib/librte_vhost/fd_man.c
@@ -200,6 +200,38 @@ fdset_del(struct fdset *pfdset, int fd)
return dat;
}
+/**
+ * Unregister the fd from the fdset.
+ *
+ * If parameters are invalid, return directly -2.
+ * And check whether fd is busy, if yes, return -1.
+ * Otherwise, try to delete the fd from fdset and
+ * return true.
+ */
+int
+fdset_try_del(struct fdset *pfdset, int fd)
+{
+ int i;
+
+ if (pfdset == NULL || fd == -1)
+ return -2;
+
+ pthread_mutex_lock(&pfdset->fd_mutex);
+ i = fdset_find_fd(pfdset, fd);
+ if (i != -1 && pfdset->fd[i].busy) {
+ pthread_mutex_unlock(&pfdset->fd_mutex);
+ return -1;
+ }
+
+ if (i != -1) {
+ pfdset->fd[i].fd = -1;
+ pfdset->fd[i].rcb = pfdset->fd[i].wcb = NULL;
+ pfdset->fd[i].dat = NULL;
+ }
+
+ pthread_mutex_unlock(&pfdset->fd_mutex);
+ return 0;
+}
/**
* This functions runs in infinite blocking loop until there is no fd in
diff --git a/lib/librte_vhost/fd_man.h b/lib/librte_vhost/fd_man.h
index 90d34db19..c00883882 100644
--- a/lib/librte_vhost/fd_man.h
+++ b/lib/librte_vhost/fd_man.h
@@ -63,6 +63,7 @@ int fdset_add(struct fdset *pfdset, int fd,
fd_cb rcb, fd_cb wcb, void *dat);
void *fdset_del(struct fdset *pfdset, int fd);
+int fdset_try_del(struct fdset *pfdset, int fd);
void *fdset_event_dispatch(void *arg);
diff --git a/lib/librte_vhost/socket.c b/lib/librte_vhost/socket.c
index 72831b347..f816601bb 100644
--- a/lib/librte_vhost/socket.c
+++ b/lib/librte_vhost/socket.c
@@ -761,13 +761,25 @@ rte_vhost_driver_unregister(const char *path)
vhost_user_remove_reconnect(vsocket);
}
+again:
pthread_mutex_lock(&vsocket->conn_mutex);
for (conn = TAILQ_FIRST(&vsocket->conn_list);
conn != NULL;
conn = next) {
next = TAILQ_NEXT(conn, next);
- fdset_del(&vhost_user.fdset, conn->connfd);
+ /*
+ * If r/wcb is executing, release the
+ * conn_mutex lock, and try again since
+ * the r/wcb may use the conn_mutex lock.
+ */
+ if (fdset_try_del(&vhost_user.fdset,
+ conn->connfd) == -1) {
+ pthread_mutex_unlock(
+ &vsocket->conn_mutex);
+ goto again;
+ }
+
RTE_LOG(INFO, VHOST_CONFIG,
"free connfd = %d for device '%s'\n",
conn->connfd, path);
--
2.11.0
next prev parent reply other threads:[~2018-05-20 13:09 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-20 13:02 [dpdk-stable] patch 'event/dpaa2: remove link from info structure' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'crypto/scheduler: set null pointer after freeing' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'crypto/scheduler: fix memory leak' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'app/crypto-perf: check minimum lcore number' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'test/reorder: fix freeing mbuf twice' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'test/distributor: fix return type of thread function' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'test/pipeline: fix return type of stub miss' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'examples/quota_watermark: fix return type of threads' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'app/testpmd: fix slave port detection' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'app/testpmd: fix valid ports prints' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'app/testpmd: fix forward ports update' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'app/testpmd: fix forward ports Rx flush' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'app/testpmd: fix synchronic port hotplug' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'app/testpmd: fix removed device link status asking' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'examples/performance-thread: fix return type of threads' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'test/pipeline: fix type of table entry parameter' " Yuanhan Liu
2018-05-20 13:02 ` Yuanhan Liu [this message]
2018-05-20 13:02 ` [dpdk-stable] patch 'net/vhost: initialise device as inactive' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'net/bnxt: fix Rx mbuf and agg ring leak in dev stop' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'net/bnxt: fix usage of vnic id' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'app/testpmd: fix empty list of RSS queues for flow' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'net/failsafe: fix probe cleanup' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'net/i40e: fix link status update' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'net/bonding: fix slave activation simultaneously' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'mempool: fix virtual address population' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'net/bnx2x: do not cast function pointers as a policy' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'net/bnx2x: fix KR2 device check' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'net/bnx2x: fix memzone name overrun' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'net/i40e: fix failing to disable FDIR Tx queue' " Yuanhan Liu
2018-05-20 13:02 ` [dpdk-stable] patch 'net/ixgbe: fix too many interrupts' " Yuanhan Liu
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