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From: "wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/31472] systemtap.base/tracepoints.stp causes reboot
 with RHEL9 linux 5.14.0-428.el9.x86_64
Date: Thu, 14 Mar 2024 18:51:44 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31472

--- Comment #5 from William Cohen <wcohen at redhat dot com> ---
Did a git bisect running against the RHEL9 428 kernel and verified that the
problem on RHEL9 is caused by:

commit 155c689b2a75dcb217a1c52886c04982f4c169f2
Author: William Cohen <wcohen@redhat.com>
Date:   Thu Mar 7 13:44:06 2024 -0500

    PR30716: Turn off objtool warnings on systemtap instrumentation modules

    The previous approaches to turning off the objtool warnings did not
    work for x86_64 RHEL9.  The systemtap generated code is not on the
    whitelist to use certain kernel functions. The additional objtool
    warning output mentioning the systemtap code using those functions
    with UACCESS enabled caused a number of the tests in the testsuite to
    fail.  The generated Makefile now includes a line to turn off running
    objtool on the systemtap generated module and eliminates those
    warnings.

There are additional sections on generated .ko module when objtool is run. =
 The
missing orc_unwind explains why the backtrace is looking a bit odd. Below s=
hows
what sections the bad .ko is missing:

 diff -u0 a b
--- a   2024-03-13 15:26:23.637081062 -0400
+++ b   2024-03-13 15:25:58.343950133 -0400
@@ -7 +6,0 @@
-.call_sites
@@ -21,2 +19,0 @@
-.orc_unwind
-.orc_unwind_ip
@@ -27 +23,0 @@
-.rela.call_sites
@@ -32 +27,0 @@
-.rela.orc_unwind_ip
@@ -36,2 +30,0 @@
-.rela.retpoline_sites
-.rela.return_sites
@@ -40 +32,0 @@
-.rela.static_call_sites
@@ -43,2 +34,0 @@
-.retpoline_sites
-.return_sites
@@ -51 +40,0 @@
-.static_call_sites

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