Hi Martin, thanks for your suggestions.
Since the system rebooted after such crash usually, I wanted to use netconsole (as described at https://wiki.ubuntu.com/Kernel/KernelDebuggingTricks#Network_Console ), but I didn't see any messages on the network, probably because the netconsole module has to be loaded (and added) in the initrd. Will look further into how to enable it... (BTW, probably, by chance, with these added parameters (debug and netconsole), the system has just booted successfully.) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1495116 Title: booting with amd64 kernel and completely i386 userland is unstable during the system upstart Status in linux package in Ubuntu: Incomplete Status in systemd package in Ubuntu: Incomplete Status in udev package in Ubuntu: Incomplete Status in upstart package in Ubuntu: Incomplete Bug description: I wanted to run my 14.10 (Utopic) i386 system with the amd64 kernel, so I added that architecture and apt-get-installed the amd64 linux- image and linux-image-extra (I learned this was possible thanks to the advice at http://askubuntu.com/a/635774/19753 ). However, the system upstart procedure more often fails than not: it fails by rebooting the computer. (Only around 1 time of 4 is successful.) A limited system start is (probably, always) successful: either with init=/bin/bash parameter to the kernel, or choosing the recovery boot option. (However, if I "resume" from the recovery menu, or run "exec init" in bash, then the upstart procedure is similarly unstable: it usually fails/crashes and reboots.) I checked my suspection that the video driver (nouveau) and X might be involved, but that turned out not true: the upstart procedure is similarly unstable with "nomodesetting" kernel parameter and without, booting into runlevel 3 or the default one. Perhaps, I'd like to debug the upstart procedure step-by-step to detect which step makes the system crash and reboot, but I don't know how. As concerns the timing, the moment the reboot happens can be different: it can happen rather early (when I see the message about activating the swap) or much later. If the system upstart procedure has completed successfully, then it works in a quite stable manner and doesn't crash/reboot. So, there is something bad specifically during the system upstart procedure. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: upstart 1.13.2-0ubuntu2 ProcVersionSignature: Ubuntu 3.16.0-44.59-generic 3.16.7-ckt14 Uname: Linux 3.16.0-44-generic x86_64 ApportVersion: 2.14.7-0ubuntu8.5 Architecture: i386 CurrentDesktop: Unity Date: Sat Sep 12 18:36:28 2015 InstallationDate: Installed on 2014-06-04 (464 days ago) InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release i386 (20140204) ProcKernelCmdline: BOOT_IMAGE=/boot/vmlinuz-3.16.0-44-generic root=UUID=980299a2-fde5-4f39-acb0-189f528b8485 ro nosplash SourcePackage: upstart UpgradeStatus: Upgraded to utopic on 2015-09-11 (0 days ago) UpstartBugCategory: System UpstartRunningSessionVersion: upstart 1.13.2 UpstartRunningSystemVersion: init (upstart 1.13.2) modified.conffile..etc.at.deny: [inaccessible: [Errno 13] Отказано в доступе: '/etc/at.deny'] modified.conffile..etc.cron.daily.upstart: [modified] modified.conffile..etc.cups.cups.browsed.conf: [modified] modified.conffile..etc.default.apport: [modified] modified.conffile..etc.default.cups: [modified] modified.conffile..etc.init.d.binfmt.support: [modified] mtime.conffile..etc.X11.Xsession.d.99upstart: 2014-09-30T12:21:08 mtime.conffile..etc.cron.daily.upstart: 2014-09-30T12:27:13 mtime.conffile..etc.cups.cups.browsed.conf: 2015-09-06T09:29:16.410097 mtime.conffile..etc.default.apport: 2014-06-05T12:49:10.316398 mtime.conffile..etc.default.cups: 2015-09-06T09:20:49.891585 mtime.conffile..etc.init.d.binfmt.support: 2014-09-30T12:21:08 mtime.conffile..etc.upstart.xsessions: 2014-09-30T12:21:08 --- ApportVersion: 2.14.7-0ubuntu8.5 Architecture: i386 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: marsmorgana 1972 F.... pulseaudio CRDA: country RU: DFS-UNSET (2402 - 2482 @ 40), (N/A, 20) (5735 - 5835 @ 20), (N/A, 30) CurrentDesktop: Unity DistroRelease: Ubuntu 14.10 HibernationDevice: RESUME=UUID=9267c811-3a01-4484-b968-c08582280d81 InstallationDate: Installed on 2014-06-04 (464 days ago) InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release i386 (20140204) MachineType: SAMSUNG ELECTRONICS CO., LTD. R510/P510 Package: upstart 1.13.2-0ubuntu2 PackageArchitecture: i386 ProcFB: 0 nouveaufb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-44-generic root=UUID=980299a2-fde5-4f39-acb0-189f528b8485 ro nosplash ProcKernelCmdline: BOOT_IMAGE=/boot/vmlinuz-3.16.0-44-generic root=UUID=980299a2-fde5-4f39-acb0-189f528b8485 ro nosplash ProcVersionSignature: Ubuntu 3.16.0-44.59-generic 3.16.7-ckt14 RelatedPackageVersions: linux-restricted-modules-3.16.0-44-generic N/A linux-backports-modules-3.16.0-44-generic N/A linux-firmware 1.138.1 Tags: utopic utopic third-party-packages Uname: Linux 3.16.0-44-generic x86_64 UpgradeStatus: Upgraded to utopic on 2015-09-11 (0 days ago) UpstartBugCategory: System UpstartRunningSessionVersion: upstart 1.13.2 UpstartRunningSystemVersion: init (upstart 1.13.2) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 09/26/2008 dmi.bios.vendor: Phoenix Technologies Ltd. dmi.bios.version: 07LI.MP00.20080926.SCY dmi.board.name: R510/P510 dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: Not Applicable dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: N/A dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr07LI.MP00.20080926.SCY:bd09/26/2008:svnSAMSUNGELECTRONICSCO.,LTD.:pnR510/P510:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnR510/P510:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A: dmi.product.name: R510/P510 dmi.product.version: Not Applicable dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. modified.conffile..etc.at.deny: [inaccessible: [Errno 13] Отказано в доступе: u'/etc/at.deny'] modified.conffile..etc.cups.cups.browsed.conf: [modified] modified.conffile..etc.default.apport: [modified] modified.conffile..etc.default.cups: [modified] modified.conffile..etc.init.d.binfmt.support: [modified] mtime.conffile..etc.X11.Xsession.d.99upstart: 2014-09-30T12:21:08 mtime.conffile..etc.cron.daily.upstart: 2014-09-30T12:27:13 mtime.conffile..etc.cups.cups.browsed.conf: 2015-09-06T09:29:16.410097 mtime.conffile..etc.default.apport: 2014-06-05T12:49:10.316399 mtime.conffile..etc.default.cups: 2015-09-06T09:20:49.891586 mtime.conffile..etc.init.d.binfmt.support: 2014-09-30T12:21:08 mtime.conffile..etc.upstart.xsessions: 2014-09-30T12:21:08 --- ApportVersion: 2.17.2-0ubuntu1.4 Architecture: i386 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: marsmorgana 2343 F.... pulseaudio CurrentDesktop: Unity DistroRelease: Ubuntu 15.04 HibernationDevice: RESUME=UUID=9267c811-3a01-4484-b968-c08582280d81 InstallationDate: Installed on 2014-06-04 (465 days ago) InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release i386 (20140204) MachineType: SAMSUNG ELECTRONICS CO., LTD. R510/P510 Package: upstart PackageArchitecture: i386 ProcFB: 0 nouveaufb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-28-generic root=UUID=980299a2-fde5-4f39-acb0-189f528b8485 ro recovery init=/sbin/upstart ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5 RelatedPackageVersions: linux-restricted-modules-3.19.0-28-generic N/A linux-backports-modules-3.19.0-28-generic N/A linux-firmware 1.143.3 SystemdDelta: [EXTENDED] /lib/systemd/system/systemd-timesyncd.service → /lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf [EXTENDED] /etc/systemd/system/display-manager.service → /lib/systemd/system/display-manager.service.d/xdiagnose.conf 2 overridden configuration files found. Tags: vivid vivid Uname: Linux 3.19.0-28-generic x86_64 UpgradeStatus: Upgraded to vivid on 2015-09-13 (0 days ago) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 09/26/2008 dmi.bios.vendor: Phoenix Technologies Ltd. dmi.bios.version: 07LI.MP00.20080926.SCY dmi.board.name: R510/P510 dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: Not Applicable dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: N/A dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr07LI.MP00.20080926.SCY:bd09/26/2008:svnSAMSUNGELECTRONICSCO.,LTD.:pnR510/P510:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnR510/P510:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A: dmi.product.name: R510/P510 dmi.product.version: Not Applicable dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. 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