[Bug bpf/27030] New: bpf: user_long_error() leads to assertion failures in the translator

[Bug bpf/27030] New: bpf: user_long_error() leads to assertion failures in the translator

[agentzh at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27030

            Bug ID: 27030
           Summary: bpf: user_long_error() leads to assertion failures in
                    the translator
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: bpf
          Assignee: systemtap at sourceware dot org
          Reporter: agentzh at gmail dot com
  Target Milestone: ---

I tried using the `user_long_error()` tapset function with the bpf runtime but
it fails with an assertion failure in the translator. Tested the latest master
branch on Fedora 32 x86_64.


```
[agentzh@fed32-min ~/git/systemtap 134 (master)]$ cat a.c
long a = 0xdeadbeef;

int main (void) {
    return 0;
}

[agentzh@fed32-min ~/git/systemtap 0 (master)]$ gcc -g a.c -o /tmp/a.out

[agentzh@fed32-min ~/git/systemtap 0 (master)]$ nm /tmp/a.out|grep ' a'
0000000000404020 D a

[agentzh@fed32-min ~/git/systemtap 0 (master)]$ /opt/stap/bin/stap --bpf -c
./a.out -e 'probe process("/tmp/a.out").function("main") { println("a: ",
user_long_error(0x601020)) exit() }'
stap: staptree.h:1349: virtual update_visitor::~update_visitor(): Assertion
`values.empty()' failed.
Aborted (core dumped)

[agentzh@fed32-min ~/git/systemtap 130 (master)]$ /opt/stap/bin/stap -V
Systemtap translator/driver (version 4.5/0.182, commit
release-4.4-24-g3e0d449fe427 + changes)
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 ... 5.10.0-rc
enabled features: BPF NLS
```

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[Bug bpf/27030] bpf: user_long_error() leads to assertion failures in the translator

[agentzh at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27030

--- Comment #1 from agentzh <agentzh at gmail dot com> ---
BTW, I'm using the stock kernel provided by Fedora 32:

```
[agentzh@fed32-min ~/git/systemtap 0 (master)]$ cat /proc/version
Linux version 5.9.11-100.fc32.x86_64
(mockbuild@bkernel01.iad2.fedoraproject.org) (gcc (GCC) 10.2.1 20201016 (Red
Hat 10.2.1-6), GNU ld version 2.34-6.fc32) #1 SMP Tue Nov 24 19:16:53 UTC 2020
```

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[Bug bpf/27030] bpf: user_long_error() leads to assertion failures in the translator

[agentzh at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27030

--- Comment #2 from agentzh <agentzh at gmail dot com> ---
Tried the same example on an older kernel on Fedora 28 x86_64. Same thing:

```
[agentzh@glass ~/git/systemtap.new 1 (master)]$ /opt/stap/bin/stap --bpf -c
/tmp/a.out -e 'probe process("/tmp/a.out").function("main") { println("a: ",
user_long_error(0x601020)) exit() }'
stap: staptree.h:1349: virtual update_visitor::~update_visitor(): Assertion
`values.empty()' failed.
Aborted (core dumped)

[agentzh@glass ~/git/systemtap.new 134 (master)]$ cat /proc/version
Linux version 5.0.16-100.fc28.x86_64
(mockbuild@bkernel04.phx2.fedoraproject.org) (gcc version 8.3.1 20190223 (Red
Hat 8.3.1-2) (GCC)) #1 SMP Tue May 14 18:22:28 UTC 2019

[agentzh@glass ~/git/systemtap.new 0 (master)]$ /opt/stap/bin/stap -V
Systemtap translator/driver (version 4.5/0.177, commit
release-4.4-24-g3e0d449fe427 + changes)
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 ... 5.10.0-rc
enabled features: BOOST_STRING_REF DYNINST BPF LIBSQLITE3 LIBXML2 NLS READLINE
```

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[Bug bpf/27030] bpf: user_long_error() leads to assertion failures in the translator

[me at serhei dot io]

https://sourceware.org/bugzilla/show_bug.cgi?id=27030

Serhei Makarov <me at serhei dot io> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|systemtap at sourceware dot org    |me at serhei dot io
                 CC|                            |me at serhei dot io

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