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From: "wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug tapsets/26152] New: _struct_compat_timex_u() function doesn't
 work on rhel8
Date: Mon, 22 Jun 2020 18:45:43 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26152

            Bug ID: 26152
           Summary: _struct_compat_timex_u() function doesn't work on
                    rhel8
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tapsets
          Assignee: systemtap at sourceware dot org
          Reporter: wcohen at redhat dot com
  Target Milestone: ---

When running the current snapshot of systemtap on rhel8 some of the examples
(errsnoop and strace) that probe all the syscalls were failing.  Tracked the
problem down to the _struct_compat_timex_u() function.  This doesn't appear=
 to
be a problem with the newer kernels in feora 32.

$ rpm -q kernel
kernel-4.18.0-216.el8.x86_64
$ stap -V
Systemtap translator/driver (version 4.4/0.180, rpm 4.4-1.202006221421.el8)
Copyright (C) 2005-2020 Red Hat, Inc. and others
This is free software; see the source for copying conditions.
tested kernel versions: 2.6.32 ... 5.7.0
enabled features: AVAHI BOOST_STRING_REF DYNINST BPF JAVA PYTHON3 LIBRPM
LIBSQLITE3 LIBVIRT LIBXML2 NLS NSS READLINE MONITOR_LIBS
$ stap -p4 -e 'probe syscall.clock_adjtime {printf("%s\n", tx_uaddr_str)}'
/tmp/stapjqCFmW/stap_bf428e306108d6ed4ee7e688fdb3a93d_67608_src.c: In funct=
ion
=E2=80=98function___global__struct_compat_timex_u__overload_0=E2=80=99:
/tmp/stapjqCFmW/stap_bf428e306108d6ed4ee7e688fdb3a93d_67608_src.c:4195:22:
error: storage size of =E2=80=98ts=E2=80=99 isn=E2=80=99t known
  struct compat_timex ts;
                      ^~
/tmp/stapjqCFmW/stap_bf428e306108d6ed4ee7e688fdb3a93d_67608_src.c:4203:14:
error: invalid application of =E2=80=98sizeof=E2=80=99 to incomplete type =
=E2=80=98struct old_timex32=E2=80=99
       sizeof(struct compat_timex)) =3D=3D 0)
              ^~~~~~
make[1]: *** [scripts/Makefile.build:315:
/tmp/stapjqCFmW/stap_bf428e306108d6ed4ee7e688fdb3a93d_67608_src.o] Error 1
make: *** [Makefile:1545: _module_/tmp/stapjqCFmW] Error 2
WARNING: kbuild exited with status: 2
Pass 4: compilation failed.  [man error::pass4]

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