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[84.3.50.134]) by smtp.gmail.com with ESMTPSA id f189sm10194177wmf.16.2020.01.30.22.43.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Jan 2020 22:43:29 -0800 (PST) Date: Fri, 31 Jan 2020 07:43:27 +0100 From: Ingo Molnar To: Linus Torvalds Cc: =?iso-8859-1?Q?J=F6rg?= Otte , Linux Kernel Mailing List , the arch/x86 maintainers Subject: Re: 5.6-### doesn't boot Message-ID: <20200131064327.GB130017@gmail.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Linus Torvalds wrote: > On Thu, Jan 30, 2020 at 9:32 AM Jörg Otte wrote: > > > > my notebook doesn't boot with current kernel. Booting stops right after > > displaying "loading initial ramdisk..". No further displays. > > Also nothing is wriiten to the logs. > > > > last known good kernel is : vmlinuz-5.5.0-00849-gb0be0eff1a5a > > first known bad kernel is : vmlinuz-5.5.0-01154-gc677124e631d > > It would be lovely if you can bisect a bit. But my merges in that > range are all from Ingo: > > Ingo Molnar (7): > header cleanup > objtool updates > RCU updates > EFI updates > locking updates > perf updates > scheduler updates If I had to guess then perhaps the EFI changes look the most dangerous ones from these trees - but in principle most of these trees could contain a boot crasher/hang bug. > but not having any messages at all makes it hard to guess where it > would be. To improve debug output: Removing any 'fbcon' options in /boot/grub/grub.cfg and adding this to the boot options might improve the debug output: earlyprintk=vga initcall_debug ignore_loglevel debug panic_on_warn So for example if the relevant kernel boot entry in grub.cfg looks like this: linux /vmlinuz-5.3.0-26-generic root=UUID=1bcxabe3-0b62-4x04-b456-47cd90c0e6x4 ro splash $vt_handoff Then editing it to the following could in principle produce (much) more verbose boot output: linux /vmlinuz-5.3.0-26-generic root=UUID=1bcxabe3-0b62-4x04-b456-47cd90c0e6x4 ro earlyprintk=vga initcall_debug ignore_loglevel debug panic_on_warn $vt_handoff If this produces more output than just "loading initial ramdisk..' then a photo of the hung screen would be sufficient, no need to transcribe it. > A few bisect runs would narrow it down a fair amount. Bisecting all the > way would be even better, of course, Agreed! If compiling full kernels for bisections takes too long (for example because the .config is from a distro kernel) then running "make localmodconfig" to create a config tailored to the currently active modules will cut down significantly on build time. Also, a warning: if the normal boot log contains spurious warnings then the new 'panic_on_warn' option will cause additional trouble on good kernels. Thanks, Ingo