[Xen-devel] [PATCH] xen/xenbus: fix self-deadlock after killing user process

[Juergen Gross <jgross@xxxxxxxx>]

In case a user process using xenbus has open transactions and is killed
e.g. via ctrl-C the following cleanup of the allocated resources might
result in a deadlock due to trying to end a transaction in the xenbus
worker thread:

[ 2551.474706] INFO: task xenbus:37 blocked for more than 120 seconds.
[ 2551.492215]       Tainted: P           OE     5.0.0-29-generic #5
[ 2551.510263] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
message.
[ 2551.528585] xenbus          D    0    37      2 0x80000080
[ 2551.528590] Call Trace:
[ 2551.528603]  __schedule+0x2c0/0x870
[ 2551.528606]  ? _cond_resched+0x19/0x40
[ 2551.528632]  schedule+0x2c/0x70
[ 2551.528637]  xs_talkv+0x1ec/0x2b0
[ 2551.528642]  ? wait_woken+0x80/0x80
[ 2551.528645]  xs_single+0x53/0x80
[ 2551.528648]  xenbus_transaction_end+0x3b/0x70
[ 2551.528651]  xenbus_file_free+0x5a/0x160
[ 2551.528654]  xenbus_dev_queue_reply+0xc4/0x220
[ 2551.528657]  xenbus_thread+0x7de/0x880
[ 2551.528660]  ? wait_woken+0x80/0x80
[ 2551.528665]  kthread+0x121/0x140
[ 2551.528667]  ? xb_read+0x1d0/0x1d0
[ 2551.528670]  ? kthread_park+0x90/0x90
[ 2551.528673]  ret_from_fork+0x35/0x40

Fix this by doing the cleanup via a workqueue instead.

Reported-by: James Dingwall <james@xxxxxxxxxxxxxx>
Fixes: fd8aa9095a95c ("xen: optimize xenbus driver for multiple concurrent 
xenstore accesses")
Cc: <stable@xxxxxxxxxxxxxxx> # 4.11
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 drivers/xen/xenbus/xenbus_dev_frontend.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/xenbus/xenbus_dev_frontend.c 
b/drivers/xen/xenbus/xenbus_dev_frontend.c
index 08adc590f631..597af455a522 100644
--- a/drivers/xen/xenbus/xenbus_dev_frontend.c
+++ b/drivers/xen/xenbus/xenbus_dev_frontend.c
@@ -55,6 +55,7 @@
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/miscdevice.h>
+#include <linux/workqueue.h>
 
 #include <xen/xenbus.h>
 #include <xen/xen.h>
@@ -116,6 +117,8 @@ struct xenbus_file_priv {
        wait_queue_head_t read_waitq;
 
        struct kref kref;
+
+       struct work_struct wq;
 };
 
 /* Read out any raw xenbus messages queued up. */
@@ -300,14 +303,14 @@ static void watch_fired(struct xenbus_watch *watch,
        mutex_unlock(&adap->dev_data->reply_mutex);
 }
 
-static void xenbus_file_free(struct kref *kref)
+static void xenbus_worker(struct work_struct *wq)
 {
        struct xenbus_file_priv *u;
        struct xenbus_transaction_holder *trans, *tmp;
        struct watch_adapter *watch, *tmp_watch;
        struct read_buffer *rb, *tmp_rb;
 
-       u = container_of(kref, struct xenbus_file_priv, kref);
+       u = container_of(wq, struct xenbus_file_priv, wq);
 
        /*
         * No need for locking here because there are no other users,
@@ -333,6 +336,18 @@ static void xenbus_file_free(struct kref *kref)
        kfree(u);
 }
 
+static void xenbus_file_free(struct kref *kref)
+{
+       struct xenbus_file_priv *u;
+
+       /*
+        * We might be called in xenbus_thread().
+        * Use workqueue to avoid deadlock.
+        */
+       u = container_of(kref, struct xenbus_file_priv, kref);
+       schedule_work(&u->wq);
+}
+
 static struct xenbus_transaction_holder *xenbus_get_transaction(
        struct xenbus_file_priv *u, uint32_t tx_id)
 {
@@ -650,6 +665,7 @@ static int xenbus_file_open(struct inode *inode, struct 
file *filp)
        INIT_LIST_HEAD(&u->watches);
        INIT_LIST_HEAD(&u->read_buffers);
        init_waitqueue_head(&u->read_waitq);
+       INIT_WORK(&u->wq, xenbus_worker);
 
        mutex_init(&u->reply_mutex);
        mutex_init(&u->msgbuffer_mutex);
-- 
2.16.4


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel