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From: "wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug bpf/24639] New: "next" statement not recognized by stap bpf backend
Date: Wed, 05 Jun 2019 15:29:00 -0000
X-Bugzilla-Reason: AssignedTo
X-Bugzilla-Type: new
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X-Bugzilla-Product: systemtap
X-Bugzilla-Component: bpf
X-Bugzilla-Version: unspecified
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: wcohen at redhat dot com
X-Bugzilla-Status: NEW
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D24639

            Bug ID: 24639
           Summary: "next" statement not recognized by stap bpf backend
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: bpf
          Assignee: systemtap at sourceware dot org
          Reporter: wcohen at redhat dot com
  Target Milestone: ---

The bpf backend doesn't understand next statement

[wcohen@fedora30 systemtap]$ sudo ../install/bin/stap --bpf  -e 'probe
kernel.trace("mm_filemap_*") {if (tid()!=3Dpid()) next}' -T 1
[sudo] password for wcohen:=20
semantic error: unhandled statement or expression type: keyword at <input>:=
1:55
        source: probe kernel.trace("mm_filemap_*") {if (tid()!=3Dpid()) nex=
t}
                                                                      ^

Pass 4: compilation failed.  [man error::pass4]

However the tradtional backend does work:

[wcohen@fedora30 systemtap]$ sudo ../install/bin/stap -e 'probe
kernel.trace("mm_filemap_*") {if (tid()!=3Dpid()) next}' -T 1
wcohen@fedora30 systemtap]$

--=20
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