From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Wed, 26 May 2021 22:41:45 +0200 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by lore.white.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1lm0LZ-0004ne-2i for lore@lore.pengutronix.de; Wed, 26 May 2021 22:41:45 +0200 Received: from localhost ([127.0.0.1] helo=metis.ext.pengutronix.de) by metis.ext.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1lm0LY-0003Nc-NR; Wed, 26 May 2021 22:41:44 +0200 Received: from ptx.hi.pengutronix.de ([2001:67c:670:100:1d::c0]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lm0LK-0003NR-Iq for ptxdist@pengutronix.de; Wed, 26 May 2021 22:41:30 +0200 Received: from mol by ptx.hi.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1lm0LK-00049Q-9i for ptxdist@pengutronix.de; Wed, 26 May 2021 22:41:30 +0200 Date: Wed, 26 May 2021 22:41:30 +0200 From: Michael Olbrich To: ptxdist@pengutronix.de Message-ID: <20210526204130.GI28754@pengutronix.de> Mail-Followup-To: ptxdist@pengutronix.de References: <20210526093156.GD28754@pengutronix.de> <20210526203203.oek2owdhx2y3xp56@pengutronix.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210526203203.oek2owdhx2y3xp56@pengutronix.de> X-Sent-From: Pengutronix Hildesheim X-URL: http://www.pengutronix.de/ X-IRC: #ptxdist @freenode X-Accept-Language: de,en X-Accept-Content-Type: text/plain X-Uptime: 22:37:04 up 98 days, 0 min, 118 users, load average: 0.07, 0.13, 0.10 User-Agent: Mutt/1.10.1 (2018-07-13) Subject: Re: [ptxdist] Regenerating debug files for debugging a core dump X-BeenThere: ptxdist@pengutronix.de X-Mailman-Version: 2.1.29 Precedence: list List-Id: PTXdist Development Mailing List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: ptxdist@pengutronix.de Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "ptxdist" X-SA-Exim-Connect-IP: 127.0.0.1 X-SA-Exim-Mail-From: ptxdist-bounces@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false On Wed, May 26, 2021 at 10:32:03PM +0200, Roland Hieber wrote: > On Wed, May 26, 2021 at 11:31:56AM +0200, Michael Olbrich wrote: > > Hi, > > > > On Tue, May 25, 2021 at 04:43:54PM +0200, Guillermo Rodriguez Garcia wrote: > > > I am trying to debug a core dump from a system based on ptxdist-2018.05.0. > > > > > > I see that the debug symbols are generated in > > > platform-xxx/root/usr/lib/debug. > > > > > > The thing is that I don't have the original debug files anymore. > > > If I regenerate the root fs and everything else from the same sources > > > (ptxdist clean + ptxdist go), will the generated debug files be valid for > > > debugging the core dump? > > > > It may or may not work. PTXdist tries to make builds reproducible. But > > there are cases where it does not work and the resulting binaries are > > different. > > So it's worth a try if you don't have the debug files any more, but it's > > better to keep them to avoid relying on this. > > Hmm, if the package does not build reproducibly, its build ID will > change, so gdb won't find the debug symbols automatically. But does that > also mean that the debug symbols cannot be loaded into gdb manually? If No, gdb gets the build ID from the newly built binary, not the core dump. So it finds the debug data, but if that does not match the original binary it may not help. > the BSP was built from exactly the same sources (even without > reproducibility) most other data layouts, file names and line numbers > should still be the same, right? It depends on what's different. A small change often means that the rest of the code is shifted a bit and then the addresses won't match any more. Michael -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ ptxdist mailing list ptxdist@pengutronix.de To unsubscribe, send a mail with subject "unsubscribe" to ptxdist-request@pengutronix.de