apport information ** Tags added: apport-collected
** Description changed: Every time the kernel is upgraded and initrd is regenerated, some modules are loaded. These modules are not necessary for the system to run, take up memory and may even enlarge the attack surface when (security-)issues were to be found in these modules. How to reproduce on this Amazon EC2 instance: -------------------------------------------------------------------------- # lsmod [nothing] # dpkg-reconfigure linux-image-3.2.0-38-virtual Running depmod. update-initramfs: deferring update (hook will be called later) Examining /etc/kernel/postinst.d. run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 3.2.0-38-virtual /boot/vmlinuz-3.2.0-38-virtual run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.2.0-38-virtual /boot/vmlinuz-3.2.0-38-virtual update-initramfs: Generating /boot/initrd.img-3.2.0-38-virtual run-parts: executing /etc/kernel/postinst.d/x-grub-legacy-ec2 3.2.0-38-virtual /boot/vmlinuz-3.2.0-38-virtual Searching for GRUB installation directory ... found: /boot/grub Searching for default file ... found: /boot/grub/default Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst Searching for splash image ... none found, skipping ... Found kernel: /boot/vmlinuz-3.2.0-38-virtual Updating /boot/grub/menu.lst ... done run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.2.0-38-virtual /boot/vmlinuz-3.2.0-38-virtual Generating grub.cfg ... cat: /boot/grub/video.lst: No such file or directory /usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/xvda1. Found linux image: /boot/vmlinuz-3.2.0-38-virtual Found initrd image: /boot/initrd.img-3.2.0-38-virtual /usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/xvda1. /usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/xvda1. /usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/xvda1. /usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/xvda1. /usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/xvda1. done # lsmod Module Size Used by btrfs 638248 0 zlib_deflate 26622 1 btrfs libcrc32c 12543 1 btrfs ufs 78131 0 vfat 17308 0 msdos 17132 0 fat 55605 2 vfat,msdos xfs 747494 0 ext2 67987 0 # grep -r ^[a-zA-Z] /etc/modules /etc/initramfs-tools/ /etc/modprobe.d/ | grep -v blacklist /etc/initramfs-tools/initramfs.conf:MODULES=list /etc/initramfs-tools/initramfs.conf:BUSYBOX=y /etc/initramfs-tools/initramfs.conf:COMPCACHE_SIZE="" /etc/initramfs-tools/initramfs.conf:COMPRESS=gzip /etc/initramfs-tools/initramfs.conf:BOOT=local /etc/initramfs-tools/initramfs.conf:DEVICE= /etc/initramfs-tools/initramfs.conf:NFSROOT=auto /etc/initramfs-tools/update-initramfs.conf:update_initramfs=yes /etc/initramfs-tools/update-initramfs.conf:backup_initramfs=no # grep ^b /etc/modprobe.d/local.conf blacklist btrfs blacklist zlib_deflate blacklist libcrc32c blacklist crc32c blacklist ufs blacklist qnx4 blacklist hfsplus blacklist hfs blacklist minix blacklist ntfs blacklist vfat blacklist msdos blacklist fat blacklist dm_crypt -------------------------------------------------------------------------- Interestingly, none of these modules are included in the resulting initrd: # gzip -dc /boot/initrd* | cpio -it | grep kernel/ lib/modules/3.2.0-38-virtual/kernel/drivers lib/modules/3.2.0-38-virtual/kernel/drivers/video lib/modules/3.2.0-38-virtual/kernel/drivers/video/vga16fb.ko lib/modules/3.2.0-38-virtual/kernel/drivers/video/vgastate.ko lib/modules/3.2.0-38-virtual/kernel/drivers/video/vesafb.ko lib/modules/3.2.0-38-virtual/kernel/drivers/md lib/modules/3.2.0-38-virtual/kernel/drivers/md/dm-crypt.ko lib/modules/3.2.0-38-virtual/kernel/crypto lib/modules/3.2.0-38-virtual/kernel/crypto/xts.ko lib/modules/3.2.0-38-virtual/kernel/crypto/gf128mul.ko lib/modules/3.2.0-38-virtual/kernel/arch lib/modules/3.2.0-38-virtual/kernel/arch/x86 lib/modules/3.2.0-38-virtual/kernel/arch/x86/crypto lib/modules/3.2.0-38-virtual/kernel/arch/x86/crypto/aes-i586.ko 10837 blocks Note: executing "update-initramfs -u -k `uname -r`" alone does NOT load these modules! Workaround: - Running "rmmod btrfs zlib_deflate libcrc32c ufs vfat msdos fat xfs ext2" - after every kernel upgrade. + Running "rmmod btrfs zlib_deflate libcrc32c ufs vfat msdos fat xfs ext2" after every kernel upgrade. + --- + AcpiTables: + + AlsaDevices: + total 0 + crw-rw---T 1 root audio 116, 1 Feb 8 15:01 seq + crw-rw---T 1 root audio 116, 33 Feb 8 15:01 timer + AplayDevices: Error: [Errno 2] No such file or directory + ApportVersion: 2.0.1-0ubuntu17.1 + Architecture: i386 + ArecordDevices: Error: [Errno 2] No such file or directory + AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: + CRDA: Error: [Errno 2] No such file or directory + DistroRelease: Ubuntu 12.04 + IwConfig: Error: [Errno 2] No such file or directory + Lspci: Error: [Errno 2] No such file or directory + Lsusb: Error: [Errno 2] No such file or directory + MarkForUpload: True + Package: linux (not installed) + PciMultimedia: + + ProcEnviron: + TERM=xterm-color + PATH=(custom, no user) + LANG=en_US.UTF-8 + SHELL=/bin/bash + ProcFB: + + ProcKernelCmdLine: root=UUID=0145b26e-0d12-45a8-b22e-fc09c1eb2904 ro console=hvc0 + ProcModules: + + ProcVersionSignature: Ubuntu 3.2.0-38.59-virtual 3.2.37 + RelatedPackageVersions: + linux-restricted-modules-3.2.0-38-virtual N/A + linux-backports-modules-3.2.0-38-virtual N/A + linux-firmware 1.79.2 + RfKill: Error: [Errno 2] No such file or directory + Tags: precise + Uname: Linux 3.2.0-38-virtual i686 + UpgradeStatus: Upgraded to precise on 2012-08-21 (177 days ago) + UserGroups: + + WifiSyslog: ** Attachment added: "BootDmesg.txt" https://bugs.launchpad.net/bugs/1125597/+attachment/3529252/+files/BootDmesg.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1125597 Title: Don't autoload unneeded modules To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1125597/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
