Merge branch 'net-netpoll-fix-memory-leak-and-add-comprehensive-selftests'

Breno Leitao says:

====================
net: netpoll: fix memory leak and add comprehensive selftests

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.decot@googlers.com/
====================

Link: https://patch.msgid.link/20251107-netconsole_torture-v10-0-749227b55f63@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>