On Wed, Oct 23, 2024 at 04:38:01AM -0700, Breno Leitao wrote: > +- fail_skb_realloc > + > + inject skb (socket buffer) reallocation events into the network path. The > + primary goal is to identify and prevent issues related to pointer > + mismanagement in the network subsystem. By forcing skb reallocation at > + strategic points, this feature creates scenarios where existing pointers to > + skb headers become invalid. > + > + When the fault is injected and the reallocation is triggered, these pointers > + no longer reference valid memory locations. This deliberate invalidation > + helps expose code paths where proper pointer updating is neglected after a > + reallocation event. > + > + By creating these controlled fault scenarios, the system can catch instances > + where stale pointers are used, potentially leading to memory corruption or > + system instability. > + > + To select the interface to act on, write the network name to the following file: > + `/sys/kernel/debug/fail_skb_realloc/devname` > + If this field is left empty (which is the default value), skb reallocation > + will be forced on all network interfaces. > + > - NVMe fault injection > > inject NVMe status code and retry flag on devices permitted by setting > @@ -216,6 +238,19 @@ configuration of fault-injection capabilities. > use a negative errno, you better use 'printf' instead of 'echo', e.g.: > $ printf %#x -12 > retval > > +- /sys/kernel/debug/fail_skb_realloc/devname: > + > + Specifies the network interface on which to force SKB reallocation. If > + left empty, SKB reallocation will be applied to all network interfaces. > + > + Example usage:: > + > + # Force skb reallocation on eth0 > + echo "eth0" > /sys/kernel/debug/fail_skb_realloc/devname > + > + # Clear the selection and force skb reallocation on all interfaces > + echo "" > /sys/kernel/debug/fail_skb_realloc/devname > + The doc LGTM, thanks! Reviewed-by: Bagas Sanjaya <bagasdotme@xxxxxxxxx> -- An old man doll... just what I always wanted! - Clara
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