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[12.32.117.8]) by smtp.googlemail.com with ESMTPSA id h29sm3615902qtb.46.2019.08.30.09.07.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 30 Aug 2019 09:07:18 -0700 (PDT) Subject: Re: hwpmc ktrdump: failed to resolve ktr symbols To: shreyank amartya , freebsd-drivers@freebsd.org Cc: freebsd-hackers@freebsd.org References: From: Navdeep Parhar Message-ID: <0534e1a9-af57-96cf-9ea2-ec4b30021226@gmail.com> Date: Fri, 30 Aug 2019 09:07:16 -0700 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:68.0) Gecko/20100101 Thunderbird/68.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 46Kkrm1xwlz4FxG X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=W0UqHRXF; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of nparhar@gmail.com designates 2607:f8b0:4864:20::736 as permitted sender) smtp.mailfrom=nparhar@gmail.com X-Spamd-Result: default: False [-3.99 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; FREEMAIL_FROM(0.00)[gmail.com]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; NEURAL_HAM_SHORT(-0.99)[-0.992,0]; FREEMAIL_TO(0.00)[gmail.com]; FROM_EQ_ENVFROM(0.00)[]; IP_SCORE(0.00)[ip: (-9.38), ipnet: 2607:f8b0::/32(-2.84), asn: 15169(-2.32), country: US(-0.05)]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; MID_RHS_MATCH_FROM(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0]; 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]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; IP_SCORE_FREEMAIL(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[6.3.7.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Aug 2019 16:07:21 -0000 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