Fix a memory leak in netpoll and introduce netconsole selftests that expose the issue when running with kmemleak detection enabled.
This patchset includes a selftest for netpoll with multiple concurrent users (netconsole + bonding), which simulates the scenario from test[1] that originally demonstrated the issue allegedly fixed by commit efa95b01da18 ("netpoll: fix use after free") - a commit that is now being reverted.
Sending this to "net" branch because this is a fix, and the selftest might help with the backports validation.
Link: https://lore.kernel.org/lkml/96b940137a50e5c387687bb4f57de8b0435a653f.140485... [1]
Signed-off-by: Breno Leitao leitao@debian.org --- Changes in v5: - Set CONFIG_BONDING=m in selftests/drivers/net/config. - Link to v4: https://lore.kernel.org/r/20250917-netconsole_torture-v4-0-0a5b3b8f81ce@debi...
Changes in v4: - Added an additional selftest to test multiple netpoll users in parallel - Link to v3: https://lore.kernel.org/r/20250905-netconsole_torture-v3-0-875c7febd316@debi...
Changes in v3: - This patchset is a merge of the fix and the selftest together as recommended by Jakub.
Changes in v2: - Reuse the netconsole creation from lib_netcons.sh. Thus, refactoring the create_dynamic_target() (Jakub) - Move the "wait" to after all the messages has been sent. - Link to v1: https://lore.kernel.org/r/20250902-netconsole_torture-v1-1-03c6066598e9@debi...
--- Breno Leitao (4): net: netpoll: fix incorrect refcount handling causing incorrect cleanup selftest: netcons: refactor target creation selftest: netcons: create a torture test selftest: netcons: add test for netconsole over bonded interfaces
net/core/netpoll.c | 7 +- tools/testing/selftests/drivers/net/Makefile | 2 + tools/testing/selftests/drivers/net/config | 1 + .../selftests/drivers/net/lib/sh/lib_netcons.sh | 197 ++++++++++++++++++--- .../selftests/drivers/net/netcons_over_bonding.sh | 76 ++++++++ .../selftests/drivers/net/netcons_torture.sh | 127 +++++++++++++ 6 files changed, 385 insertions(+), 25 deletions(-) --- base-commit: 5e87fdc37f8dc619549d49ba5c951b369ce7c136 change-id: 20250902-netconsole_torture-8fc23f0aca99
Best regards, -- Breno Leitao leitao@debian.org