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pointers are used. By forcing reallocation through fault injection, we can stress-test code paths and ensure proper pointer management after potential skb reallocations. Add a hook for fault injection in the following functions: * pskb_trim_rcsum() * pskb_may_pull_reason() * pskb_trim() As the other fault injection mechanism, protect it under a debug Kconfig called CONFIG_FAIL_SKB_REALLOC. This patch was *heavily* inspired by Jakub's proposal from: https://lore.kernel.org/all/20240719174140.47a868e6@kernel.org/ CC: Akinobu Mita <akinobu.mita@gmail.com> Suggested-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Breno Leitao <leitao@debian.org> Reviewed-by: Akinobu Mita <akinobu.mita@gmail.com> Acked-by: Paolo Abeni <pabeni@redhat.com> Acked-by: Guillaume Nault <gnault@redhat.com> Link: https://patch.msgid.link/20241107-fault_v6-v6-1-1b82cb6ecacd@debian.org Signed-off-by: Paolo Abeni <pabeni@redhat.com> 2024-08-26Fix typo "allocateed" to allocatedGianfranco Trad Fix minor typo in the fault-injection documentation, where the word allocated was misspelled as "allocateed". Signed-off-by: Gianfranco Trad <gianf.trad@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/20240819110641.1931-1-gianf.trad@gmail.com 2024-08-07docs: fault-injection: document cache-filter feature for failslabBreno Leitao The failslab fault injection mechanism has an undocumented capability that provides significant utility in testing and debugging. This feature, introduced in commit 4c13dd3b48fcb ("failslab: add ability to filter slab caches"), allows for targeted error injection into specific slab caches. However, it was inadvertently left undocumented at the time of its implementation. Add documentation for the cache-filter feature in the failslab mode description. Also, providing a practical example demonstrating how to use cache-filter to inject failures specifically when allocating socket buffers (skbs). Signed-off-by: Breno Leitao <leitao@debian.org> Reviewed-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/20240726120930.3231333-1-leitao@debian.org