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From: "agentzh at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug tapsets/26843] New: print_ubacktrace_fileline is broken on master
Date: Wed, 04 Nov 2020 21:54:25 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26843

            Bug ID: 26843
           Summary: print_ubacktrace_fileline is broken on master
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tapsets
          Assignee: systemtap at sourceware dot org
          Reporter: agentzh at gmail dot com
  Target Milestone: ---

Seems like `print_ubacktrace_fileline` is broken on Ubuntu 20 x86_64 (kernel
Linux ubuntu20-pkg 5.4.0-24-generic #28-Ubuntu SMP Thu Apr 9 22:16:42 UTC 2=
020
x86_64 x86_64 x86_64 GNU/Linux) It can be reproduced with the following min=
imal
example using the latest systemtap git master (commit 9102da049a):

First prepare the target C program:

```C
int main(void) {
    return 0;
}
```

Compile it to generate executable file `./a.out`:

```
gcc -g a.c
```

Prepare the following simple .stp file:

```
function foo() {
    print_ubacktrace_fileline();
}

probe process.function("main") {
    foo();
    exit();
}
```

And run both:

```
$ stap a.stp -c ./a.out
WARNING: Kernel function symbol table missing [man warning::symbols]
 0x55cfc28cd131 : main+0x8/0x17 [/home/agentzh/git/systemtap-plus/a.out]
 0x7f59d5d7d0b3 [/usr/lib/x86_64-linux-gnu/libc-2.31.so+0x270b3/0x1f2000]
WARNING: Missing unwind data for a module, rerun with 'stap -d
/usr/lib/x86_64-linux-gnu/libc-2.31.so'
```

No file name or line numbers in the output. (The warnings can be safely ign=
ored
since they are not relevant here).

For comparison on CentOS 6, for example, it works fine using the same versi=
on
of stap:

```
$ stap a.stp -c ./a.out
 0x4004b6 : main+0x4/0xe at /home/agentzh/git/systemtap/a.c:2
[/home/agentzh/git/systemtap/a.out]
 0x7fe4d3140d20 [/lib64/libc-2.12.so+0x1ed20/0x394000]
WARNING: Missing unwind data for a module, rerun with 'stap -d
/lib64/libc-2.12.so'
```

--=20
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