aya EbpfLoader::set_global does not work

[cppcoffee]

Ebpf defines TRACE_ALL global variable:

#[no_mangle]
static TRACE_ALL: bool = false;

https://github.com/cppcoffee/rust-memleak/blob/dev-sharp/rust-memleak-ebpf/src/main.rs#L25

Call set_global to set TRACE_ALL:

    let mut ebpf = EbpfLoader::new()
        .btf(Btf::from_sys_fs().ok().as_ref())
        .set_global("TRACE_ALL", &(opt.verbose as u8), true)

https://github.com/cppcoffee/rust-memleak/blob/dev-sharp/rust-memleak/src/main.rs#L76

After running it, observe that the set_global function does not work.

Ebpf TRACE_ALL is expected to be set to 1.

[alessandrod]

See the example in the docs https://docs.rs/aya/latest/aya/struct.EbpfLoader.html#method.set_global, you must use read_volatile.