ERROR::PASS4(7stap) ERROR::PASS4(7stap)

# [NAME](#NAME)

error::pass4 - systemtap pass-4 errors

# [DESCRIPTION](#DESCRIPTION)

Errors that occur during pass 4 (compilation) have generally only a few causes:

[kernel or OS version changes](#kernel)

The systemtap runtime and embedded-C fragments in the tapset library are designed to be portable across a wide range of OS versions. However, incompatibilities can occur when some OS changes occur, such as kernel modifications that change functions, types, or macros referenced by systemtap. Upstream (git://sourceware.org/git/systemtap.git) builds of systemtap are often quickly updated to include relevant fixes, so try getting or making an updated build. Reworded: **build systemtap from git** **for use with very young kernels**. If the issue persists, report the problem to the systemtap developers.

[buggy embedded-C code](#buggy)

Embedded-C code in your own guru-mode script cannot be checked by systemtap, and is passed through verbatim to the compiler. Errors in such snippets of code may be found during the pass-4 compiler invocation, though may be hard to identify by the compiler errors.

[incompatible embedded-C code](#incompatible)

The interface standards between systemtap-generated code and embedded-C code occasionally change. For example, before version 1.8, arguments were passed using macros *THIS->foo* and *THIS->\_\_retvalue* but from version 1.8 onward, using *STAP\_ARG\_foo* and *STAP\_RETVALUE*. Adjust your embedded-C code to current standards, or use the *stap --compatible=VERSION* option to make systemtap use a different one.

[compiler bugs and mysteries](#compiler)

Messages such as "internal compiler error" suggest compiler problems. These should be reported to the compiler developers in the form of a preprocessed *.i* file, plus the compiler command line. To gather relevant information, run

```
stap -k --vp 0003 -p4 ....
```

Systemtap will report the saved temporary directory, and the compiler command line it attempted. Go to the directory to find he main generated file *stap\_NNNNN\_src.c*. Force the compiler to produce a preprocessed file with:

```
make -C /lib/modules/`uname -r`/build M=`pwd` stap_NNNNN_src.i
```

(note the *.i* suffix), and the compiler command line should be in the file *.stap\_NNNNN\_src.i.cmd*.

# [SEE ALSO](#SEE_ALSO)

```
stap(1),
error::reporting(7stap)
```

---

Document: error::pass4(7stap) from systemtap 5.6-r1 (Chainguard OS)
Source: https://sourceware.org/git/systemtap.git