Date: Thu, 8 Aug 2019 19:02:06 +0300 From: Slava Shwartsman <slavash@FreeBSD.org> To: Michael Tuexen <tuexen@freebsd.org> Cc: Alan Somers <asomers@freebsd.org>, current <current@freebsd.org> Subject: Re: kernel module code coverage Message-ID: <aa9bd1a8-63d7-aa20-046c-9ef162acb5f0@FreeBSD.org> In-Reply-To: <24BDECBA-3E34-4FD9-AE82-DCDFFAEE7A81@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> <24BDECBA-3E34-4FD9-AE82-DCDFFAEE7A81@freebsd.org>
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On 08-Aug-19 18:14, Michael Tuexen wrote: >> 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 > Thanks Michael and Alan. Slava
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