From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from s3.sipsolutions.net ([2a01:4f8:191:4433::2] helo=sipsolutions.net) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1m3O5K-00BDoE-OX for linux-um@lists.infradead.org; Tue, 13 Jul 2021 19:28:52 +0000 Message-ID: <17bc19ae635b61d50627fd1601b0ab12b5128999.camel@sipsolutions.net> Subject: Re: UML kernel panic on initialization From: Johannes Berg Date: Tue, 13 Jul 2021 21:28:44 +0200 In-Reply-To: <8c377addaa42a7dd3bbe047e1f744a51103e6ff2.camel@sipsolutions.net> References: <6442ec0e5e2cf55990b43ff178023fd6050e63fb.camel@sipsolutions.net> <8c377addaa42a7dd3bbe047e1f744a51103e6ff2.camel@sipsolutions.net> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-um" Errors-To: linux-um-bounces+geert=linux-m68k.org@lists.infradead.org To: subashab@codeaurora.org, jdike@addtoit.com, richard@nod.at, anton.ivanov@cambridgegreys.com, linux-um@lists.infradead.org On Tue, 2021-07-13 at 21:26 +0200, Johannes Berg wrote: > On Tue, 2021-07-13 at 21:22 +0200, Johannes Berg wrote: > > On Sat, 2021-07-10 at 15:00 -0600, subashab@codeaurora.org wrote: > > > > > > I have reverted the following patches (to allow for a clean revert) > > > and I don't see the panic anymore - > > > > > > bfc58e2b98e99737409cd9f4d86a79677c5b887c > > > dc01a3b9db43abf95b801c9694980777a329e303 > > > 9f0b4807a44ff81cf59421c8a86641efec586610 > > > 84b2789d61156db0224724806b20110c0d34b07c > > > > Out of those 4, the last ("separate child and...") seems actually less > > intrusive than the previous one. If you revert only the first three of > > this list, does it still happen? > > > > Does it still happen if you unset CONFIG_CC_OPTIMIZE_FOR_SIZE and do > > CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE instead? > > Oh, and it looks like 84b2789d6115 actually got some bits that shouldn't > have been there! > > Assuming it does *not* work with just the first three patches reverted, > does it work again if you revert the first three patches, and only this > bit of the fourth? [snip] And as yet another experiment in this area, does it work again if you apply this patch? https://patchwork.ozlabs.org/project/linux-um/patch/20210303155523.124277-11-benjamin@sipsolutions.net/ Not sure it applies as-is, but you can see the schema there. johannes _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um