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From: "wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug translator/27984] stap skipping partially-inlined instance, but
 it is not inline function actually
Date: Fri, 16 Jul 2021 14:49:32 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27984

--- Comment #8 from William Cohen <wcohen at redhat dot com> ---
To better check what was going on I added the following patch to see what
offsets were being used and found that the libssl.so.1.1 library had a bias=
 of
0x10000 for the addresses:

diff --git a/tapsets.cxx b/tapsets.cxx
index 20e0cb68f..251e2a4b6 100644
--- a/tapsets.cxx
+++ b/tapsets.cxx
@@ -2280,9 +2280,14 @@ query_dwarf_func (Dwarf_Die * func, dwarf_query * q)
               // up the ELF symbol name and rely on a heuristic.
               GElf_Sym sym;
               GElf_Off off =3D 0;
-              const char *name =3D dwfl_module_addrinfo (q->dw.module, ent=
rypc,
+             Dwarf_Addr bias =3D 0x10000;
+
+             const char *name =3D dwfl_module_addrinfo (q->dw.module, entr=
ypc +
bias,
                                                        &off, &sym, NULL, N=
ULL,
NULL);

+             if (q->sess.verbose>2)
+                     clog << _F("%s =3D dwfl_module_addrinfo(entrypc=3D%p,
off=3D%p)\n",
+                                name, (void*)entrypc, (void*) off);
               if (name !=3D NULL && strstr(name, ".part.") !=3D NULL)
                 {
                   if (q->sess.verbose>2)



With this patch see that the code is finding the correct function names for=
 the
library functions:

focused on module
'/tmp/stap-job1/sysroot/usr/local/openresty/openssl/lib/libssl.so.1.1'
selected function BIO_new_ssl
BIO_new_ssl =3D dwfl_module_addrinfo(entrypc=3D0x1f760, off=3D(nil))
selected function BIO_new_ssl_connect
BIO_new_ssl_connect =3D dwfl_module_addrinfo(entrypc=3D0x1f7e0, off=3D(nil))
selected function ssl_puts
ssl_puts =3D dwfl_module_addrinfo(entrypc=3D0x1ed10, off=3D(nil))
selected function ssl_new
ssl_new =3D dwfl_module_addrinfo(entrypc=3D0x1ed40, off=3D(nil))
selected function BIO_ssl_shutdown
BIO_ssl_shutdown =3D dwfl_module_addrinfo(entrypc=3D0x1f960, off=3D(nil))
selected function ssl_callback_ctrl
ssl_callback_ctrl =3D dwfl_module_addrinfo(entrypc=3D0x1ecd0, off=3D(nil))

--=20
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