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This patch adds a selftest that verifies netconsole functionality over bonded network interfaces using netdevsim. It sets up two bonded interfaces acting as transmit (TX) and receive (RX) ends, placed in separate network namespaces. The test sends kernel log messages and verifies that they are properly received on the bonded RX interfaces with both IPv4 and IPv6, and using basic and extended netconsole formats. This patchset aims to test a long-standing netpoll subsystem where netpoll has multiple users. (in this case netconsole and bonding). A similar selftest has been discussed in [1] and [2]. This test also tries to enable bonding and netpoll in different order, just to guarantee that all the possibilities are exercised. Link: https://lore.kernel.org/all/20250905-netconsole_torture-v3-0-875c7febd316@debian.org/ [1] Link: https://lore.kernel.org/lkml/96b940137a50e5c387687bb4f57de8b0435a653f.1404857349.git.decot@googlers.com/ [2] Signed-off-by: Breno Leitao <leitao@debian.org> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/20251107-netconsole_torture-v10-4-749227b55f63@debian.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>