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.1404857349.git.de...@googlers.com/
[1]
Signed-off-by: Breno Leitao <lei...@debian.org>
---
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-v3-0-875c7febd...@debian.org
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-v1-1-03c606659...@debian.org
---
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 +
.../selftests/drivers/net/lib/sh/lib_netcons.sh | 197 ++++++++++++++++++---
.../selftests/drivers/net/netcons_over_bonding.sh | 76 ++++++++
.../selftests/drivers/net/netcons_torture.sh | 127 +++++++++++++
5 files changed, 384 insertions(+), 25 deletions(-)
---
base-commit: 5e87fdc37f8dc619549d49ba5c951b369ce7c136
change-id: 20250902-netconsole_torture-8fc23f0aca99
Best regards,
--
Breno Leitao <lei...@debian.org>
