https://bugs.kde.org/show_bug.cgi?id=492050
Bug ID: 492050
Summary: Valgrind does not understand some eBPF commands passed
into the bpf syscalls
Classification: Developer tools
Product: valgrind
Version: 3.23.0
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: wco...@redhat.com
Target Milestone: ---
SUMMARY
When attempting to track down the root cause of a valgrind complaint about
unitialized fields in some PCP code I noticed that valgrind would print out
messages in the following in the output:
--1794549-- WARNING: unhandled eBPF command 28
--1794549-- WARNING: unhandled eBPF command 35
The command 28 and 35 map to BPF_LINK_CREATE and BPF_PROG_BIND_MAP,
respectively. The handling of things the bpf syscall handles is incomplete.
STEPS TO REPRODUCE on Fedora 40 as root:
1. dnf install pcp-pmda-bpf valgrind
2. touch /var/lib/pcp/pmdas/bpf/.NeedInstall
3. systemctl restart pmcd
4. valgrind pminfo -L -K clear -K
add,157,/var/lib/pcp/pmdas/bpf/pmda_bpf,bpf_init -dmtT bpf.disk bpf.runq
OBSERVED RESULT
The output has a number of messages about "unhandled eBPF command ..."
EXPECTED RESULT
No messages about unhandled eBPF commands in the output
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 40 pcp-pmda-bpf-6.2.2-3.fc39.x86_64
valgrind-3.22.0-4.fc39.x86_64
ADDITIONAL INFORMATION
The last command in the list that valgrind understands is BPF_MAP_FREEZE. There
looks to be a number of additional BPF commands after BPF_MAP_FREEZE listed on
the 6.11 kernel:
https://elixir.bootlin.com/linux/v6.11-rc4/source/include/uapi/linux/bpf.h#L922
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