I have added the information collected by apport, although this seems like such an obviously possible (if rare) event that it does not take too much debugging to identify what is happening.
The issue is more about deciding what action to take, rather than finding the bug... obviously you don't want people to be able to accidentally overwrite a filesystem, but you also don't want swap to mysteriously disappear from people's machines... perhaps check the partition type and wipe the first 1Meg of any partition marked "Linux Swap" before starting the encrypted disks. -- 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/1386339 Title: cryptswap can fail if random data matches a filesystem magic number Status in “linux” package in Ubuntu: Incomplete Bug description: I noticed that my encrypted swap was not working, and I found that the randomly generated encrypted filesystem had randomly generated data that had the magic number of a filesystem type, and hence ever more it refused to start... Eg:- root@hardline:/etc# more /etc/crypttab cryptswap1 /dev/sda3 /dev/urandom swap,cipher=aes-cbc-essiv:sha256 root@hardline:/etc# cryptdisks_start cryptswap1 * Starting crypto disk... * cryptswap1 (starting).. * cryptswap1: the precheck for '/dev/sda3' failed: - The device /dev/sda3 contains a filesystem type hfsplus. * cryptswap1 (failed)... [fail] Obviosuly this is not a filesystem:- root@hardline:/etc# mount -t hfsplus /dev/sda3 /mnt mount: wrong fs type, bad option, bad superblock on /dev/sda3, missing codepage or helper program, or other error So I blanked it and restarted, all is now well... perhaps if there's a force option on cryptsetup this should be used in the setup scripts:- root@hardline:/etc# dd if=/dev/zero of=/dev/sda3 ^C684121+0 records in 684121+0 records out 350269952 bytes (350 MB) copied, 5.96378 s, 58.7 MB/s root@hardline:/etc# cryptdisks_start cryptswap1 * Starting crypto disk... * cryptswap1 (starting).. * cryptswap1 (started)... [ OK ] --- ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: james 3650 F.... pulseaudio /dev/snd/controlC1: james 3650 F.... pulseaudio DistroRelease: Ubuntu 14.10 EcryptfsInUse: Yes InstallationDate: Installed on 2014-04-28 (182 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) MachineType: LENOVO 20266 Package: linux (not installed) ProcEnviron: LANGUAGE=en_GB:en TERM=xterm PATH=(custom, no user) LANG=en_GB.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-23-generic.efi.signed root=UUID=1cbc95ee-97a4-4869-b1a2-135f351313eb ro quiet splash nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw vt.handoff=7 ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-3.16.0-23-generic N/A linux-backports-modules-3.16.0-23-generic N/A linux-firmware 1.138 Tags: utopic Uname: Linux 3.16.0-23-generic x86_64 UpgradeStatus: Upgraded to utopic on 2014-10-14 (13 days ago) UserGroups: _MarkForUpload: True dmi.bios.date: 10/31/2013 dmi.bios.vendor: LENOVO dmi.bios.version: 76CN31WW dmi.board.asset.tag: No Asset Tag dmi.board.name: Yoga2 dmi.board.vendor: LENOVO dmi.board.version: 31900058STD dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Lenovo Yoga 2 Pro dmi.modalias: dmi:bvnLENOVO:bvr76CN31WW:bd10/31/2013:svnLENOVO:pn20266:pvrLenovoYoga2Pro:rvnLENOVO:rnYoga2:rvr31900058STD:cvnLENOVO:ct10:cvrLenovoYoga2Pro: dmi.product.name: 20266 dmi.product.version: Lenovo Yoga 2 Pro dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1386339/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
