regression_test.txt (1628B)
1Testing for regressions in Media Controller API register, ioctl, syscall, 2and unregister paths. There have a few problems that result in user-after 3free on media_device, media_devnode, and cdev pointers when the driver is 4unbound while ioctl is in progress. 5 6Test Procedure: 7 8Run bin/unbind loop while ioctls are in progress. 9Run rmmod and modprobe. 10Disconnect the device. 11 12Setup: 13 14Build media_device_test 15cd tools/testing/selftests/media_tests 16make 17 18Regressions test for cdev user-after free error on /dev/mediaX when driver 19is unbound: 20 21Start media_device_test to regression test media devnode dynamic alloc 22and cdev user-after-free fixes. This opens media dev files and sits in 23a loop running media ioctl MEDIA_IOC_DEVICE_INFO command once every 10 24seconds. The idea is when device file goes away, media devnode and cdev 25should stick around until this test exits. 26 27The test for a random number of iterations or until user kills it with a 28sleep 10 in between the ioctl calls. 29 30sudo ./media_device_test -d /dev/mediaX 31 32Regression test for media_devnode unregister race with ioctl_syscall: 33 34Start 6 open_loop_test.sh tests with different /dev/mediaX files. When 35device file goes away after unbind, device file name changes. Start the 36test with possible device names. If we start with /dev/media0 for example, 37after unbind, /dev/media1 or /dev/media2 could get created. The idea is 38keep ioctls going while bind/unbind runs. 39 40Copy bind_unbind_sample.txt and make changes to specify the driver name 41and number to run bind and unbind. Start the bind_unbind.sh 42 43Run dmesg looking for any user-after free errors or mutex lock errors.