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Thu, 12 Sep 2019 01:53:26 -0700 (PDT) MIME-Version: 1.0 References: <CAD9jf8BXm2PgY=5DkKxrweuG4x-QEERhJyPTESCkxt_Bi84E9Q@mail.gmail.com> <0534e1a9-af57-96cf-9ea2-ec4b30021226@gmail.com> In-Reply-To: <0534e1a9-af57-96cf-9ea2-ec4b30021226@gmail.com> From: shreyank amartya <shreyankfbsd@gmail.com> Date: Thu, 12 Sep 2019 14:23:14 +0530 Message-ID: <CAD9jf8DwYRr1gBKF2u8MSxrWdv9GZTs-CDO=Pfp9xMPAEkBbdw@mail.gmail.com> Subject: Re: hwpmc ktrdump: failed to resolve ktr symbols To: Navdeep Parhar <nparhar@gmail.com> Cc: freebsd-drivers@freebsd.org, freebsd-hackers@freebsd.org X-Rspamd-Queue-Id: 46TXc73lfzz40f5 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=LCiihPYI; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of shreyankfbsd@gmail.com designates 2607:f8b0:4864:20::c35 as permitted sender) smtp.mailfrom=shreyankfbsd@gmail.com X-Spamd-Result: default: False [-3.00 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; FREEMAIL_FROM(0.00)[gmail.com]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; IP_SCORE(0.00)[ip: (-8.67), ipnet: 2607:f8b0::/32(-2.72), asn: 15169(-2.25), country: US(-0.05)]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; TO_DN_SOME(0.00)[]; IP_SCORE_FREEMAIL(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; RCVD_IN_DNSWL_NONE(0.00)[5.3.c.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; FREEMAIL_TO(0.00)[gmail.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0] Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: freebsd-drivers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Writing device drivers for FreeBSD <freebsd-drivers.freebsd.org> List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-drivers>, <mailto:freebsd-drivers-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-drivers/> List-Post: <mailto:freebsd-drivers@freebsd.org> List-Help: <mailto:freebsd-drivers-request@freebsd.org?subject=help> List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-drivers>, <mailto:freebsd-drivers-request@freebsd.org?subject=subscribe> X-List-Received-Date: Thu, 12 Sep 2019 08:53:28 -0000 Thanks, yes it seems I was missing both those options (KTR and DDB) in my kernel config. Now, I have a module (hwpmc) from which I intend to collect traces. However, when I build and load it, I don't see any ktraces when using it. But if I install it and load the module on boot, ktraces appear. Why does that happen? Anyway around that? Thanks Shreyank On Fri, Aug 30, 2019 at 9:37 PM Navdeep Parhar <nparhar@gmail.com> wrote: > On 2019-08-30 03:54, shreyank amartya wrote: > > Hi, > > > > I'm trying to collect traces from hwpmc module. I compiled the module > with > > -DHWPMC_DEBUG option and set the sysctl kern.hwpmc.debugflags but I'm > > unable to retrive the traces using ktrdump. I get this error message: > > > > ktrdump: failed to resolve ktr symbols > > > > I'm guessing that this error occurs because the symbols for hwpmc module > > (compiled and loaded separately) are not a part of kernel. If this is the > > case, then how do I get those symbols. In the ktr man page its also > > mentioned that ddb and gdb can retrieve ktraces. > > > > I found the ddb command show ktr. But how do I invoke ddb (without a > panic)? > > sysctl debug.kdb.enter=1 > > > > > I'm unable to find how can I use gdb to view the traces (I launched kgdb > > but could not find a command to show kernel traces). > > > > Any idea on how to get ktrdump working? Or get the kernel traces. > > You need a kernel with KTR support. See ktr(4) for a full list of > the options and other details. See "sysctl kern.conftxt" for what's > in your running kernel. > > Regards, > Navdeep >