> On Fri, Dec 01, 2023 at 04:01:10PM -0800, Song Liu wrote: > It appears this set breaks test_progs/trace_ext: > > https://github.com/kernel-patches/bpf/actions/runs/7062243664/job/19225827450 Yeah, my bad. There was an issue in the original patch, the attach depth check was applied not only to "fentry->fentry" chains, but also to "fentry->extension". Reducing nesting level to one revealed the problem. I'm going to modify the attach function to maintain attach_depth only for fentry progs, this will resolve the problem. Thanks!