RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Created attachment 1513488 [details]
biolatency -D command output

Description of problem:

eBPF tool 'biolatency -D' fails with Traceback

Traceback (most recent call last):
  File "./biolatency", line 121, in <module>
    fn_name="trace_req_completion")
  File "/usr/lib/python3.6/site-packages/bcc/__init__.py", line 592, in attach_kprobe
    fn = self.load_func(fn_name, BPF.KPROBE)
  File "/usr/lib/python3.6/site-packages/bcc/__init__.py", line 377, in load_func
    (func_name, errstr))
Exception: Failed to load BPF program b'trace_req_completion': Permission denied

Version-Release number of selected component (if applicable):

kernel-4.18.0-40.el8.x86_64
bcc-tools-0.7.0-3.el8.x86_64
bcc-0.7.0-3.el8.x86_64

Steps to Reproduce:

Install RHEL8 beta on KVM virt
Install bcc/bcc-tools
cd /usr/share/bcc/tools
./biolatency -D

Actual results:

Command fails

Expected results:

Command should succeed

Looks like we need commit fc245dfe9dab ("biolatency: Fix --disks bpf_probe_read() (#1980)")

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:3327