Date: Thu, 8 Aug 2019 17:14:09 +0200 From: Michael Tuexen <tuexen@freebsd.org> To: "slavash@freebsd.org" <slavash@FreeBSD.org> Cc: Alan Somers <asomers@freebsd.org>, current <current@freebsd.org> Subject: Re: kernel module code coverage Message-ID: <24BDECBA-3E34-4FD9-AE82-DCDFFAEE7A81@freebsd.org> In-Reply-To: <bb5fa55b-7402-1f12-1c4b-2fdda962216f@FreeBSD.org> References: <b233b3e5-e2ac-8dce-5552-43bac9f8a5cc@FreeBSD.org> <C839BCA7-1FA9-4E0F-B03F-59B8E5FA6FFF@freebsd.org> <CAOtMX2iv%2B_Q6kbOqUmcjpafoym0Yx9OU9p3LKt_mpYf7eEzrNw@mail.gmail.com> <bb5fa55b-7402-1f12-1c4b-2fdda962216f@FreeBSD.org>
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> On 8. Aug 2019, at 16:16, Slava Shwartsman <slavash@FreeBSD.org> wrote: > > > > On 08-Aug-19 16:52, Alan Somers wrote: >> On Thu, Aug 8, 2019 at 7:42 AM Michael Tuexen <tuexen@freebsd.org> wrote: >>> >>> >>> >>>> On 8. Aug 2019, at 14:24, Slava Shwartsman <slavash@FreeBSD.org> wrote: >>>> >>>> Apparently, Bullseye are dropping support for FreeBSD. >>>> >>>> We are looking for an alternative for kernel module run time analysis. >>>> Mostly interested in code coverage (for now). >>>> >>>> Any suggestions that work for you? >>> Have you looked into /dev/kcov. This is used by SYZKALLER for getting >>> coverage information from the kernel. >>> > > Thanks. > Is there a man page for /dev/kcov? I don't think so. There was no man page in the commit which introduced the feature: https://svnweb.freebsd.org/base?view=revision&revision=342962 You might want to look at: https://github.com/google/syzkaller/blob/master/tools/kcovtrace/kcovtrace.c how to use it. Best regards Michael > >>> Best regards >>> Michael >>>> >>>> >>>> Slava >> That's part of Matt Macy's gcov project, right?. However, while it >> works for the kernel itself, it doesn't work for modules. > > In worst case, I can build my module into the kernel, right? > >> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239194 >> -Alan > > > Slava
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