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Bug 1657909 - vfs-all-probes.stp as shipped with systemtap-4.0-5.el8 doesn't -p2
Summary: vfs-all-probes.stp as shipped with systemtap-4.0-5.el8 doesn't -p2
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: systemtap
Version: 8.0
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: 8.0
Assignee: Frank Ch. Eigler
QA Contact: Martin Cermak
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2018-12-10 17:26 UTC by Martin Cermak
Modified: 2019-06-14 01:41 UTC (History)
4 users (show)

Fixed In Version: systemtap-4.0-7.el8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2019-06-14 01:41:54 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Martin Cermak 2018-12-10 17:26:46 UTC 
The vfs-all-probes.stp as shipped with systemtap-4.0-5.el8 doesn't pass the elaboration phase.  But it is fixed upstream e.g. in 891810c24 :

=======
 8.0 Server x86_64 # rpm -q systemtap
systemtap-4.0-5.el8.x86_64
 8.0 Server x86_64 # stap -P -w -p4  /usr/share/systemtap/testsuite/buildok/vfs-all-probes.stp
semantic error: unresolved type : identifier '$cred' at /usr/share/systemtap/tapset/linux/vfs.stp:1314:23
        source:         cred = @entry($cred)
                                      ^

semantic error: while processing probe kernel.function("vfs_open@fs/open.c:883").return from: vfs.open.return from: vfs.*

semantic error: unable to find local 'cred', [man error::dwarf] dieoffset 0x3213110 in kernel, near pc 0xffffffff812a0620 in vfs_open fs/open.c (alternatives: $file, $path)): identifier '$cred' at :1314:23
        source:         cred = @entry($cred)
                                      ^

semantic error: unable to find local 'cred', [man error::dwarf] dieoffset 0x3213110 in kernel, near pc 0xffffffff812a0620 in vfs_open fs/open.c (alternatives: $file, $path)): identifier '$cred' at :1314:23
        source:         cred = @entry($cred)
                                      ^

Pass 2: analysis failed.  [man error::pass2]
(1)  8.0 Server x86_64 # 
=======

Please, backport the fix.
Comment 1 Frank Ch. Eigler 2018-12-17 20:42:07 UTC 
commit f6d68366654176541487a8916c3b61c5b1207736
Author: William Cohen <wcohen>
Date:   Mon Nov 19 14:23:15 2018 -0500
Comment 3 Martin Cermak 2019-02-11 15:55:26 UTC 
Immediately after fixing this worked, I believe, but now, probably after a kernel update to 4.18.0-67.el8, new ppc64le error::dwarf appeared here:

=======
 8.0 Server ppc64le # stap -P -w -p4  /usr/share/systemtap/testsuite/buildok/vfs-all-probes.stp
semantic error: while processing probe kernel.function("__vfs_read@fs/read_write.c:412") from: __vfs.__vfs_read from: vfs.do_sync_read from: vfs.*

semantic error: failed to retrieve location attribute for 'file' [man error::dwarf]: identifier '$file' at /usr/share/systemtap/tapset/linux/vfs.stp:692:6
        dieoffset: 0x3217158 from /usr/lib/debug/lib/modules/4.18.0-67.el8.ppc64le/vmlinux
        function: __vfs_read at fs/read_write.c:415:10 inlined by vfs_read at fs/read_write.c:452:9 inlined by ksys_read at fs/read_write.c:578:9 inlined by __do_sys_read at fs/read_write.c:588:9 inlined by __se_sys_read at fs/read_write.c:586:1
        source:         if ($file->f_op->read || !$file->f_op->read_iter) next
                            ^

semantic error: failed to retrieve location attribute for 'file' [man error::dwarf]: identifier '$file' at :692:6
        dieoffset: 0x3217158 from /usr/lib/debug/lib/modules/4.18.0-67.el8.ppc64le/vmlinux
        function: __vfs_read at fs/read_write.c:415:10 inlined by vfs_read at fs/read_write.c:452:9 inlined by ksys_read at fs/read_write.c:578:9 inlined by __do_sys_read at fs/read_write.c:588:9 inlined by __se_sys_read at fs/read_write.c:586:1
        source:         if ($file->f_op->read || !$file->f_op->read_iter) next
                            ^

semantic error: failed to retrieve location attribute for 'file' [man error::dwarf]: identifier '$file' at :692:6
        dieoffset: 0x3217158 from /usr/lib/debug/lib/modules/4.18.0-67.el8.ppc64le/vmlinux
        function: __vfs_read at fs/read_write.c:415:10 inlined by vfs_read at fs/read_write.c:452:9 inlined by ksys_read at fs/read_write.c:578:9 inlined by __do_sys_read at fs/read_write.c:588:9 inlined by __se_sys_read at fs/read_write.c:586:1
        source:         if ($file->f_op->read || !$file->f_op->read_iter) next
                            ^

semantic error: failed to retrieve location attribute for 'file' [man error::dwarf]: identifier '$file' at :692:6
        dieoffset: 0x3217158 from /usr/lib/debug/lib/modules/4.18.0-67.el8.ppc64le/vmlinux
        function: __vfs_read at fs/read_write.c:415:10 inlined by vfs_read at fs/read_write.c:452:9 inlined by ksys_read at fs/read_write.c:578:9 inlined by __do_sys_read at fs/read_write.c:588:9 inlined by __se_sys_read at fs/read_write.c:586:1
        source:         if ($file->f_op->read || !$file->f_op->read_iter) next
                            ^

semantic error: failed to retrieve location attribute for 'file' [man error::dwarf]: identifier '$file' at :692:6
        dieoffset: 0x3217158 from /usr/lib/debug/lib/modules/4.18.0-67.el8.ppc64le/vmlinux
        function: __vfs_read at fs/read_write.c:415:10 inlined by vfs_read at fs/read_write.c:452:9 inlined by ksys_read at fs/read_write.c:578:9 inlined by __do_sys_read at fs/read_write.c:588:9 inlined by __se_sys_read at fs/read_write.c:586:1
        source:         if ($file->f_op->read || !$file->f_op->read_iter) next
                            ^

semantic error: failed to retrieve location attribute for 'file' [man error::dwarf]: identifier '$file' at :692:6
        dieoffset: 0x3217158 from /usr/lib/debug/lib/modules/4.18.0-67.el8.ppc64le/vmlinux
        function: __vfs_read at fs/read_write.c:415:10 inlined by vfs_read at fs/read_write.c:452:9 inlined by ksys_read at fs/read_write.c:578:9 inlined by __do_sys_read at fs/read_write.c:588:9 inlined by __se_sys_read at fs/read_write.c:586:1
        source:         if ($file->f_op->read || !$file->f_op->read_iter) next
                            ^

semantic error: failed to retrieve location attribute for 'file' [man error::dwarf]: identifier '$file' at :692:6
        dieoffset: 0x3217158 from /usr/lib/debug/lib/modules/4.18.0-67.el8.ppc64le/vmlinux
        function: __vfs_read at fs/read_write.c:415:10 inlined by vfs_read at fs/read_write.c:452:9 inlined by ksys_read at fs/read_write.c:578:9 inlined by __do_sys_read at fs/read_write.c:588:9 inlined by __se_sys_read at fs/read_write.c:586:1
        source:         if ($file->f_op->read || !$file->f_op->read_iter) next
                            ^

semantic error: failed to retrieve location attribute for 'file' [man error::dwarf]: identifier '$file' at :692:6
        dieoffset: 0x3217158 from /usr/lib/debug/lib/modules/4.18.0-67.el8.ppc64le/vmlinux
        function: __vfs_read at fs/read_write.c:415:10 inlined by vfs_read at fs/read_write.c:452:9 inlined by ksys_read at fs/read_write.c:578:9 inlined by __do_sys_read at fs/read_write.c:588:9 inlined by __se_sys_read at fs/read_write.c:586:1
        source:         if ($file->f_op->read || !$file->f_op->read_iter) next
                            ^

semantic error: failed to retrieve location attribute for 'file' [man error::dwarf]: identifier '$file' at :692:6
        dieoffset: 0x3217158 from /usr/lib/debug/lib/modules/4.18.0-67.el8.ppc64le/vmlinux
        function: __vfs_read at fs/read_write.c:415:10 inlined by vfs_read at fs/read_write.c:452:9 inlined by ksys_read at fs/read_write.c:578:9 inlined by __do_sys_read at fs/read_write.c:588:9 inlined by __se_sys_read at fs/read_write.c:586:1
        source:         if ($file->f_op->read || !$file->f_op->read_iter) next
                            ^

semantic error: failed to retrieve location attribute for 'file' [man error::dwarf]: identifier '$file' at :692:6
        dieoffset: 0x3217158 from /usr/lib/debug/lib/modules/4.18.0-67.el8.ppc64le/vmlinux
        function: __vfs_read at fs/read_write.c:415:10 inlined by vfs_read at fs/read_write.c:452:9 inlined by ksys_read at fs/read_write.c:578:9 inlined by __do_sys_read at fs/read_write.c:588:9 inlined by __se_sys_read at fs/read_write.c:586:1
        source:         if ($file->f_op->read || !$file->f_op->read_iter) next
                            ^

semantic error: failed to retrieve location attribute for 'file' [man error::dwarf]: identifier '$file' at :692:6
        dieoffset: 0x3217158 from /usr/lib/debug/lib/modules/4.18.0-67.el8.ppc64le/vmlinux
        function: __vfs_read at fs/read_write.c:415:10 inlined by vfs_read at fs/read_write.c:452:9 inlined by ksys_read at fs/read_write.c:578:9 inlined by __do_sys_read at fs/read_write.c:588:9 inlined by __se_sys_read at fs/read_write.c:586:1
        source:         if ($file->f_op->read || !$file->f_op->read_iter) next
                            ^

Pass 2: analysis failed.  [man error::pass2]
(1)  8.0 Server ppc64le # uname -r
4.18.0-67.el8.ppc64le
 8.0 Server ppc64le #
=======

Upstream stap gives the same results as systemtap-4.0-7.el8 . I'm about to mark this one as verified anyway based on the nature of the problem.  Thoughts?
Comment 4 Martin Cermak 2019-02-11 16:12:18 UTC 
The ppc64le part appears to be https://bugzilla.redhat.com/show_bug.cgi?id=1173076#c11 .  Verified using systemtap-4.0-7.el8 .
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