tools/syz-cover: PCs returned by kcov do not have matching coverage callbacks

[eanut 6]

Hello,

I am encountering an issue while generating an HTML coverage report using
syz-cover. I would appreciate some guidance.

My Workflow:
I downloaded the raw coverage (approx. 20k addresses) via:
wget http://localhost:57701/rawcover
I ran syz-cover to generate the HTML report:
./bin/syz-cover -config test.config -debug rawcover

The Error:
The tool produces the following output: "202286 out of 202680
PCs returned by kcov do not have matching coverage callbacks. Check the
discoverModules() code. Use ?force=1 to disable this message."

My Investigation:
I manually verified the addresses in the 'rawcover' file using addr2line
with my vmlinux binary. Every address I tested was successfully resolved
to the correct source file and line number.

Question:
Since addr2line can resolve these addresses, why does syz-cover fail to
match them to coverage callbacks?

Any insights or debugging tips would be greatly appreciated.

Best regards,
Jiakai

[Aleksandr Nogikh]

Hi Jiakai,
Thanks for the report.

I see you've posted the same message at
https://github.com/google/syzkaller/issues/6551 as well, let's
continue there.

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[eanut 6]

Thanks for the feedback!

Aleksandr Nogikh <nog...@google.com> 于2026年1月7日周三 16:20写道：