[Bug runtime/29388] New: Support using systemtap with overlayfs

[Bug runtime/29388] New: Support using systemtap with overlayfs

[jeffliu.js.1999 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29388

            Bug ID: 29388
           Summary: Support using systemtap with overlayfs
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: jeffliu.js.1999 at gmail dot com
  Target Milestone: ---

When using systemtap with overlay filesystem, we need to get real inode and
pass it into uprobe_register function. Otherwise, there will be an inode error.
To fix the problem, we need to modify 4 places in runtime/linux/uprobes-inode.c
file to let systemtap get the real inode value. The following is the way to
support this feature.

733c733
---                     inode = vm_file->f_path.dentry->d_inode;
+++                     inode = d_real_inode(vm_file->f_path.dentry);
915c915
---     p->inode = dentry->d_inode;
+++     p->inode = d_real_inode(dentry);
928c928
---                          offset, vm_flags, dentry->d_inode);
+++                          offset, vm_flags, d_real_inode(dentry));
938c938
---   rc = stapiu_change_semaphore_plus(c, task, addr, dentry->d_inode);
+++   rc = stapiu_change_semaphore_plus(c, task, addr, d_real_inode(dentry));

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[Bug runtime/29388] Support using systemtap with overlayfs

[jeffliu.js.1999 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29388

Jhan-Shuo Liu <jeffliu.js.1999 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                URL|                            |https://stackoverflow.com/q
                   |                            |uestions/57487292/systemtap
                   |                            |-failed-to-probe-the-functi
                   |                            |ons-registration-error

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[Bug runtime/29388] Support using systemtap with overlayfs

[jeffliu.js.1999 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29388

Jhan-Shuo Liu <jeffliu.js.1999 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                URL|https://stackoverflow.com/q |
                   |uestions/57487292/systemtap |
                   |-failed-to-probe-the-functi |
                   |ons-registration-error      |
                 CC|                            |jeffliu.js.1999 at gmail dot com

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[Bug runtime/29388] Support using systemtap with overlayfs

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29388

Frank Ch. Eigler <fche at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fche at redhat dot com

--- Comment #1 from Frank Ch. Eigler <fche at redhat dot com> ---
Those sound like usable porting options, yup.  Since the runtime is compiled on
a wide range of kernel versions (2.6.32+ believe it, or not), we may well need
some compile-time protection for the macro/function.

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