Comment # 6 on bug 1224403 from Anthony Iliopoulos

Petr, you cannot really rely on the bpftrace-tools scripts in general,
as many of them aren't really actively maintained. This has nothing to
do with the kernel or TW (I suppose we may want to remove bpftrace-tools
but sometimes they serve as a starting point/templates).

The specific example of bashreadline.bt hasn't been updated for 6 years
upstream:

$ git log -1 tools/bashreadline.bt
commit 97fd5c4e93fc2cc2a748f169936b53cc0481c918
Author: Krzesimir Nowak <krzesimir@kinvolk.io>
Date:   Fri Oct 19 12:37:58 2018 +0200

    Use env to find bpftrace

I assume that the bpftrace syntax has changed somewhat across this time.

So:

$ bpftrace --version
bpftrace v0.20.4

$ bpftrace -e 'ur:/lib64/libreadline.so.8:readline /comm=="bash"/ {
time("%H:%M:%S  "); printf("%-6d %s\n", pid, str(retval)); }'
Attaching 1 probe...