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In `test_no_sockets` we don't expect any sockets, indeed
check_no_sockets() prints an error and exits if `sockets` list is
not empty, so free_sock_stat() call is unnecessary since it would
only be called when the `sockets` list is empty.
This was discovered by a strange warning printed by gcc v11.2.1:
In file included from ../../include/linux/list.h:7,
from vsock_diag_test.c:18:
vsock_diag_test.c: In function ‘test_no_sockets’:
../../include/linux/kernel.h:35:45: error: array subscript ‘struct vsock_stat[0]’ is partly outside array bound
s of ‘struct list_head[1]’ [-Werror=array-bounds]
35 | const typeof(((type *)0)->member) * __mptr = (ptr); \
| ^~~~~~
../../include/linux/list.h:352:9: note: in expansion of macro ‘container_of’
352 | container_of(ptr, type, member)
| ^~~~~~~~~~~~
../../include/linux/list.h:393:9: note: in expansion of macro ‘list_entry’
393 | list_entry((pos)->member.next, typeof(*(pos)), member)
| ^~~~~~~~~~
../../include/linux/list.h:522:21: note: in expansion of macro ‘list_next_entry’
522 | n = list_next_entry(pos, member); \
| ^~~~~~~~~~~~~~~
vsock_diag_test.c:325:9: note: in expansion of macro ‘list_for_each_entry_safe’
325 | list_for_each_entry_safe(st, next, sockets, list) {
| ^~~~~~~~~~~~~~~~~~~~~~~~
In file included from vsock_diag_test.c:18:
vsock_diag_test.c:333:19: note: while referencing ‘sockets’
333 | LIST_HEAD(sockets);
| ^~~~~~~
../../include/linux/list.h:23:26: note: in definition of macro ‘LIST_HEAD’
23 | struct list_head name = LIST_HEAD_INIT(name)
It seems related to some compiler optimization and assumption
about the empty `sockets` list, since this warning is printed
only with -02 or -O3. Also removing `exit(1)` from
check_no_sockets() makes the warning disappear since in that
case free_sock_stat() can be reached also when the list is
not empty.
Reported-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20211014152045.173872-1-sgarzare@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
|
||
|---|---|---|
| .. | ||
| .gitignore | ||
| control.c | ||
| control.h | ||
| Makefile | ||
| README | ||
| timeout.c | ||
| timeout.h | ||
| util.c | ||
| util.h | ||
| vsock_diag_test.c | ||
| vsock_test.c | ||
AF_VSOCK test suite
-------------------
These tests exercise net/vmw_vsock/ host<->guest sockets for VMware, KVM, and
Hyper-V.
The following tests are available:
* vsock_test - core AF_VSOCK socket functionality
* vsock_diag_test - vsock_diag.ko module for listing open sockets
The following prerequisite steps are not automated and must be performed prior
to running tests:
1. Build the kernel, make headers_install, and build these tests.
2. Install the kernel and tests on the host.
3. Install the kernel and tests inside the guest.
4. Boot the guest and ensure that the AF_VSOCK transport is enabled.
Invoke test binaries in both directions as follows:
# host=server, guest=client
(host)# $TEST_BINARY --mode=server \
--control-port=1234 \
--peer-cid=3
(guest)# $TEST_BINARY --mode=client \
--control-host=$HOST_IP \
--control-port=1234 \
--peer-cid=2
# host=client, guest=server
(guest)# $TEST_BINARY --mode=server \
--control-port=1234 \
--peer-cid=2
(host)# $TEST_BINARY --mode=client \
--control-port=$GUEST_IP \
--control-port=1234 \
--peer-cid=3