This series introduces a new test that checks for a null pointer dereference that may happen when there is a transport change[1]. This bug was fixed in [2]. Note that this test *cannot* fail, it hangs if it triggers a kernel oops. The intended use-case is to run it and then check if there is any oops in the dmesg. This test is based on Hyunwoo Kim's[3] and Michal's python reproducers[4]. [1]https://lore.kernel.org/netdev/Z2LvdTTQR7dBmPb5@v4bel-B760M-AORUS-ELITE-AX/ [2]https://lore.kernel.org/netdev/20250110083511.30419-1-sgarzare@xxxxxxxxxx/ [3]https://lore.kernel.org/netdev/Z2LvdTTQR7dBmPb5@v4bel-B760M-AORUS-ELITE-AX/#t [4]https://lore.kernel.org/netdev/2b3062e3-bdaa-4c94-a3c0-2930595b9670@xxxxxxx/ Signed-off-by: Luigi Leonardi <leonardi@xxxxxxxxxx> --- Changes in v5: - Addressed Stefano's comments: - Use a macro for G2H transport detection - Improved commits and comments text - Rebased on latest net-next - Link to v4: https://lore.kernel.org/r/20250624-test_vsock-v4-1-087c9c8e25a2@xxxxxxxxxx Changes in v4: - Addressed Stefano's comments: - Minor style changes - Use `get_transports()` to print a warning when a G2H transport is loaded - Removed check on second connect: Because the first connect is interrupted, the socket is in an unspecified state (see man connect) . This can cause strange and unexpected behaviors (connect returning success on a non-existing CID). - Link to v3: https://lore.kernel.org/r/20250611-test_vsock-v3-1-8414a2d4df62@xxxxxxxxxx Sorry, this took waaay longer than expected. Changes in v3: Addressed Stefano's and Michal's comments: - Added the splat text to the commit commessage. - Introduced commit hash that fixes the bug. - Not using perror anymore on pthread_* functions. - Listener is just created once. - Link to v2: https://lore.kernel.org/r/20250314-test_vsock-v2-1-3c0a1d878a6d@xxxxxxxxxx Changes in v2: - Addressed Stefano's comments: - Timeout is now using current_nsec() - Check for return values - Style issues - Added Hyunwoo Kim to Suggested-by - Link to v1: https://lore.kernel.org/r/20250306-test_vsock-v1-0-0320b5accf92@xxxxxxxxxx --- Luigi Leonardi (2): vsock/test: Add macros to identify transports vsock/test: Add test for null ptr deref when transport changes tools/testing/vsock/Makefile | 1 + tools/testing/vsock/util.h | 4 + tools/testing/vsock/vsock_test.c | 170 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 175 insertions(+) --- base-commit: 647496422ba9d2784fb8e15b3fda7fe801b1f2ff change-id: 20250306-test_vsock-3e77a9c7a245 Best regards, -- Luigi Leonardi <leonardi@xxxxxxxxxx>
