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[Qemu-devel] [PATCH v2 3/3] qemu-iotests: add 083 NBD client disconnect


From: Stefan Hajnoczi
Subject: [Qemu-devel] [PATCH v2 3/3] qemu-iotests: add 083 NBD client disconnect tests
Date: Wed, 26 Feb 2014 15:30:20 +0100

This new test case uses nbd-fault-injector.py to simulate broken TCP
connections at each stage in the NBD protocol.  This way we can exercise
block/nbd-client.c's socket error handling code paths.

In particular, this serves as a regression test to make sure
nbd-client.c doesn't cause an infinite loop by leaving its
nbd_receive_reply() fd handler registered after the connection has been
closed.  This bug was fixed in an earlier patch.

Signed-off-by: Stefan Hajnoczi <address@hidden>
---
 tests/qemu-iotests/083     | 129 +++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/083.out | 163 +++++++++++++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/group   |   1 +
 3 files changed, 293 insertions(+)
 create mode 100755 tests/qemu-iotests/083
 create mode 100644 tests/qemu-iotests/083.out

diff --git a/tests/qemu-iotests/083 b/tests/qemu-iotests/083
new file mode 100755
index 0000000..f764534
--- /dev/null
+++ b/tests/qemu-iotests/083
@@ -0,0 +1,129 @@
+#!/bin/bash
+#
+# Test NBD client unexpected disconnect
+#
+# Copyright Red Hat, Inc. 2014
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+# creator
address@hidden
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1       # failure is the default!
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+_supported_fmt generic
+_supported_proto nbd
+_supported_os Linux
+
+# Pick a TCP port based on our pid.  This way multiple instances of this test
+# can run in parallel without conflicting.
+choose_tcp_port() {
+       echo $((($$ % 31744) + 1024)) # 1024 <= port < 32768
+}
+
+wait_for_tcp_port() {
+       while ! (netstat --tcp --listening --numeric | \
+                grep "$1.*0.0.0.0:\*.*LISTEN") 2>&1 >/dev/null; do
+               sleep 0.1
+       done
+}
+
+filter_nbd() {
+       # nbd.c error messages contain function names and line numbers that are 
prone
+       # to change.  Message ordering depends on timing between send and 
receive
+       # callbacks sometimes, making them unreliable.
+       #
+       # Filter out the TCP port number since this changes between runs.
+       sed -e 's#^nbd.c:.*##g' \
+           -e 's#nbd:127.0.0.1:[^:]*:#nbd:127.0.0.1:PORT:#g'
+}
+
+check_disconnect() {
+       event=$1
+       when=$2
+       negotiation=$3
+       echo "=== Check disconnect $when $event ==="
+       echo
+
+       port=$(choose_tcp_port)
+
+       cat > "$TEST_DIR/nbd-fault-injector.conf" <<EOF
+[inject-error]
+event=$event
+when=$when
+EOF
+
+       if [ "$negotiation" = "--classic-negotiation" ]; then
+               extra_args=--classic-negotiation
+               nbd_url="nbd:127.0.0.1:$port"
+       else
+               nbd_url="nbd:127.0.0.1:$port:exportname=foo"
+       fi
+
+       ./nbd-fault-injector.py $extra_args "127.0.0.1:$port" 
"$TEST_DIR/nbd-fault-injector.conf" 2>&1 >/dev/null &
+       wait_for_tcp_port "127.0.0.1:$port"
+       $QEMU_IO -c "read 0 512" "$nbd_url" 2>&1 | _filter_qemu_io | filter_nbd
+
+       echo
+}
+
+for event in neg1 "export" neg2 request reply data; do
+       for when in before after; do
+               check_disconnect "$event" "$when"
+       done
+
+       # Also inject short replies from the NBD server
+       case "$event" in
+       neg1)
+               for when in 8 16; do
+                       check_disconnect "$event" "$when"
+               done
+               ;;
+       "export")
+               for when in 4 12 16; do
+                       check_disconnect "$event" "$when"
+               done
+               ;;
+       neg2)
+               for when in 8 10; do
+                       check_disconnect "$event" "$when"
+               done
+               ;;
+       reply)
+               for when in 4 8; do
+                       check_disconnect "$event" "$when"
+               done
+               ;;
+       esac
+done
+
+# Also check classic negotiation without export information
+for when in before 8 16 24 28 after; do
+       check_disconnect "neg-classic" "$when" --classic-negotiation
+done
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0
diff --git a/tests/qemu-iotests/083.out b/tests/qemu-iotests/083.out
new file mode 100644
index 0000000..85ee8d6
--- /dev/null
+++ b/tests/qemu-iotests/083.out
@@ -0,0 +1,163 @@
+QA output created by 083
+=== Check disconnect before neg1 ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not open 
image: Invalid argument
+no file open, try 'help open'
+
+=== Check disconnect after neg1 ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not open 
image: Invalid argument
+no file open, try 'help open'
+
+=== Check disconnect 8 neg1 ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not open 
image: Invalid argument
+no file open, try 'help open'
+
+=== Check disconnect 16 neg1 ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not open 
image: Invalid argument
+no file open, try 'help open'
+
+=== Check disconnect before export ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not open 
image: Invalid argument
+no file open, try 'help open'
+
+=== Check disconnect after export ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not open 
image: Invalid argument
+no file open, try 'help open'
+
+=== Check disconnect 4 export ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not open 
image: Invalid argument
+no file open, try 'help open'
+
+=== Check disconnect 12 export ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not open 
image: Invalid argument
+no file open, try 'help open'
+
+=== Check disconnect 16 export ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not open 
image: Invalid argument
+no file open, try 'help open'
+
+=== Check disconnect before neg2 ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not open 
image: Invalid argument
+no file open, try 'help open'
+
+=== Check disconnect after neg2 ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read 
image for determining its format: Input/output error
+no file open, try 'help open'
+
+=== Check disconnect 8 neg2 ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not open 
image: Invalid argument
+no file open, try 'help open'
+
+=== Check disconnect 10 neg2 ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not open 
image: Invalid argument
+no file open, try 'help open'
+
+=== Check disconnect before request ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read 
image for determining its format: Input/output error
+no file open, try 'help open'
+
+=== Check disconnect after request ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read 
image for determining its format: Input/output error
+no file open, try 'help open'
+
+=== Check disconnect before reply ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read 
image for determining its format: Input/output error
+no file open, try 'help open'
+
+=== Check disconnect after reply ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read 
image for determining its format: Input/output error
+no file open, try 'help open'
+
+=== Check disconnect 4 reply ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read 
image for determining its format: Input/output error
+no file open, try 'help open'
+
+=== Check disconnect 8 reply ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read 
image for determining its format: Input/output error
+no file open, try 'help open'
+
+=== Check disconnect before data ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read 
image for determining its format: Input/output error
+no file open, try 'help open'
+
+=== Check disconnect after data ===
+
+
+read failed: Input/output error
+
+=== Check disconnect before neg-classic ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT: Could not open image: Invalid 
argument
+no file open, try 'help open'
+
+=== Check disconnect 8 neg-classic ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT: Could not open image: Invalid 
argument
+no file open, try 'help open'
+
+=== Check disconnect 16 neg-classic ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT: Could not open image: Invalid 
argument
+no file open, try 'help open'
+
+=== Check disconnect 24 neg-classic ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT: Could not open image: Invalid 
argument
+no file open, try 'help open'
+
+=== Check disconnect 28 neg-classic ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT: Could not open image: Invalid 
argument
+no file open, try 'help open'
+
+=== Check disconnect after neg-classic ===
+
+
+qemu-io: can't open device nbd:127.0.0.1:PORT: Could not read image for 
determining its format: Input/output error
+no file open, try 'help open'
+
+*** done
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index db127d9..4cbe4b0 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -85,3 +85,4 @@
 079 rw auto
 081 rw auto
 082 rw auto quick
+083 rw auto
-- 
1.8.5.3




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