[Bug tapsets/26184] New: fullpath_struct_file does not handle struct dentry on 5.6.19-300.fc32.x86_64

[guillaume at morinfr dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26184

            Bug ID: 26184
           Summary: fullpath_struct_file does not handle struct dentry on
                    5.6.19-300.fc32.x86_64
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tapsets
          Assignee: systemtap at sourceware dot org
          Reporter: craig.ringer at 2ndquadrant dot com
                CC: guillaume at morinfr dot org
  Target Milestone: ---
                CC: guillaume at morinfr dot org

Created attachment 12671
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12671&action=edit
Output from fullpath_struct_file

fullpath_struct_file fails in dentry.stp with "type definition 'dentry' not
found". Full error output will be provided as attachment.

Command:

$ stap -v -c /bin/false -e 'probe process.begin { printf("%s",
fullpath_struct_file(task_current(), current_exe_file())); exit(); }'

semantic error: type definition 'dentry' not found in '': operator '@cast' at
/usr/share/systemtap/tapset/linux/dentry.stp:64:15
        source:         s = & @cast(dentry, "dentry")->d_name;

... more errors ... (see attached)

$ uname -r
5.6.19-300.fc32.x86_64

$ rpm -q systemtap
systemtap-4.3-1.fc32.x86_64

$ stap --version
Systemtap translator/driver (version 4.3/0.179, rpm 4.3-1.fc32)
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 ... 5.7.0
enabled features: AVAHI BOOST_STRING_REF DYNINST BPF JAVA PYTHON3 LIBRPM
LIBSQLITE3 LIBVIRT LIBXML2 NLS NSS READLINE MONITOR_LIBS


The failing command simplifies to:


$ stap -v -c /bin/false -e 'probe process.begin { printf("%s", d_name(0));
exit(); }'

--- Comment #1 from Craig Ringer <craig.ringer at 2ndquadrant dot com> ---
*** Bug 26185 has been marked as a duplicate of this bug. ***

--- Comment #2 from Craig Ringer <craig.ringer at 2ndquadrant dot com> ---
*** Bug 26186 has been marked as a duplicate of this bug. ***

--- Comment #3 from Craig Ringer <craig.ringer at 2ndquadrant dot com> ---
Checked latest git 403e92779, same outcome:

WARNING: Potential type mismatch in reassignment: identifier 'root_dentry' at
/usr/local/systemtap/share/systemtap/tapset/linux/dentry.stp:246:3
 source:                root_dentry = @cast(task, "task_struct",
"kernel")->fs->root->dentry
                        ^

--- Comment #4 from Craig Ringer <craig.ringer at 2ndquadrant dot com> ---
Well, similar anyway; it runs, then dies with

ERROR: read fault [man error::fault] at 0x10 near operator '->' at
/usr/local/systemtap/share/systemtap/tapset/linux/dentry.stp:267:19

but the warnings from the latest git match the errors from the packaged
version.

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