On 08/24, Tianyi Liu wrote: > > A key trigger here is that the two tracer instances (either `bpftrace` or > `perf record`) must be running *simultaneously*. One of them should use > PID1 as filter, while the other uses PID2. Yes. > Agreed, the implementation of uretprobe should be almost the same as > uprobe, but it seems uretprobe was ignored in previous modifications. I forgot EVERYTHING about the code in kernel/trace/trace_uprobe.c, but at first glance I am not sure that your patch is what we need... At least I certainly disagree with "Fixes: c1ae5c75e103" ;) uretprobe_perf_func/etc was designed for perf, and afaics this code still works fine even if you run 2 perf-record's with -p PID1/PID2 at the same time. BPF hacks/hooks were added later, so perhaps this should be fixed in the bpf code, but I have no idea what bpftrace does... Oleg.
