[DTrace-devel] Test that PASSes but should not

[Kris Van Hees]

On Thu, Jul 24, 2025 at 02:21:36PM -0400, Eugene Loh wrote:
> And yet it has a .r file?

Yes, the problem is less with the test and more with something going wrong with
BTF handling causing the probe to not have a BTF ID and yet it is trying to
load a program for it.  Attachment should not even be tried in that case.

Working out what is wrong and fixing.

> On 7/24/25 13:25, Kris Van Hees wrote:
> > This is not a good thing:
> > 
> > test/unittest/ip/tst.ipv4localicmp.sh: Running timeout --signal=TERM 41 test/unittest/ip/tst.ipv4localicmp.sh /home/kvanhees/dtrace-bpf-user/build/dtrace
> > PASS.
> > -- @@stderr --
> > BPF: func#0 @0
> > BPF: func#1 @154
> > BPF: func#2 @1121
> > BPF: func#3 @1136
> > BPF: func#4 @1350
> > BPF: func#5 @1355
> > BPF: func#6 @1438
> > BPF: func#7 @1453
> > BPF: func#8 @1667
> > BPF: func#9 @1706
> > BPF: func#10 @1746
> > BPF: func#11 @1926
> > BPF: func#12 @1995
> > BPF: func#13 @2064
> > BPF: func#14 @2074
> > BPF: Tracing programs must provide btf_id
> > BPF: verification time 33 usec
> > BPF: stack depth 0+0+0+0+0+0+0+0+0+0+0+0+0+0+0
> > BPF: processed 0 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0
> > dtrace: could not enable tracing: BPF program load for 'fbt:ipv6:ip6_finish_output:entry' failed: Invalid argument
> > 
> > That failure definitely should cause the test to fail.
> >