[Bug 613273] Re: kernel panic on ec2 in system_call_fastpath

[jMCg]

I, or rather smb :) was wondering what could still be mounted that would
prevent an overmount, so I added another debug output, that of `mount`
right after `mount -n -o move /dev ${rootmnt}/dev`:

    Begin: Running /scripts/init-bottom ... rootfs on / type rootfs (rw)
    sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
    proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
    udev on /root/dev type devtmpfs (rw,relatime,size=2019088k,nr_inodes=504772,mode=755)
    devpts on /root/dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
    tmpfs on /run type tmpfs (rw,nosuid,relatime,size=811332k,mode=755)
    fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
    /dev/vda on /root type ext4 (ro,relatime,user_xattr,acl,barrier=1,data=ordered)
    done.
    run-init: nuking initramfs contents: Directory not empty
    [    6.357963] Kernel panic - not syncing: Attempted to kill init!
    [    6.359092] Pid: 1, comm: run-init Not tainted 3.0.0-12-server #20-Ubuntu
    [    6.360413] Call Trace:
    [    6.360893]  [<ffffffff815e8184>] panic+0x91/0x194
    [    6.361913]  [<ffffffff810626c5>] forget_original_parent+0x245/0x250
    [    6.363086]  [<ffffffff810626e7>] exit_notify+0x17/0x150
    [    6.364123]  [<ffffffff81062feb>] do_exit+0x1fb/0x440
    [    6.365066]  [<ffffffff81063387>] sys_exit+0x17/0x20
    [    6.366001]  [<ffffffff81606c02>] system_call_fastpath+0x16/0x1b

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https://bugs.launchpad.net/bugs/613273

Title:
  kernel panic on ec2 in system_call_fastpath

Status in “initramfs-tools” package in Ubuntu:
  Invalid
Status in “linux” package in Ubuntu:
  Invalid
Status in “udev” package in Ubuntu:
  Fix Released
Status in “initramfs-tools” source package in Maverick:
  Invalid
Status in “linux” source package in Maverick:
  Invalid
Status in “udev” source package in Maverick:
  Triaged
Status in “initramfs-tools” source package in Natty:
  Invalid
Status in “linux” source package in Natty:
  Invalid
Status in “udev” source package in Natty:
  Triaged

Bug description:
  In testing alpha-3 build 20100813.2, I found the following kernel oops:
  [    0.473264] Kernel panic - not syncing: Attempted to kill init!^M
  [    0.473277] Pid: 1, comm: run-init Not tainted 2.6.35-14-virtual #19-Ubuntu^M
  [    0.473284] Call Trace:^M
  [    0.473294]  [<ffffffff815a0109>] panic+0x90/0x111^M
  [    0.473303]  [<ffffffff81006b1b>] ? __raw_callee_save_xen_irq_enable+0x11/0x26^M
  [    0.473312]  [<ffffffff8106276d>] forget_original_parent+0x33d/0x350^M
  [    0.473318]  [<ffffffff81061b94>] ? put_files_struct+0xc4/0xf0^M
  [    0.473325]  [<ffffffff8106279b>] exit_notify+0x1b/0x190^M
  [    0.473330]  [<ffffffff810640a5>] do_exit+0x1c5/0x3f0^M
  [    0.473336]  [<ffffffff81006afd>] ? __raw_callee_save_xen_irq_disable+0x11/0x1e^M
  [    0.473343]  [<ffffffff810643d7>] sys_exit+0x17/0x20^M
  [    0.473349]  [<ffffffff8100a0f2>] system_call_fastpath+0x16/0x1b^M

  This happened only once in my testing so far today (dozens of boots).
  I'm attaching the console log of failed instance.  The instance that reported this bug is same ami/region different instance.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: linux-image-2.6.35-14-virtual 2.6.35-14.19
  Regression: Yes
  Reproducible: No
  ProcVersionSignature: User Name 2.6.35-14.19-virtual 2.6.35
  Uname: Linux 2.6.35-14-virtual x86_64
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  CurrentDmesg: [   12.900041] eth0: no IPv6 routers present
  Date: Wed Aug  4 01:19:11 2010
  Ec2AMI: ami-09c3bc5b
  Ec2AMIManifest: ubuntu-images-testing-ap-southeast-1/ubuntu-maverick-daily-amd64-server-20100803.2.manifest.xml
  Ec2AvailabilityZone: ap-southeast-1b
  Ec2InstanceType: m1.large
  Ec2Kernel: aki-11d5aa43
  Ec2Ramdisk: unavailable
  Frequency: Once a week.
  Lspci:
   
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  ProcCmdLine: root=LABEL=uec-rootfs ro
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcModules: acpiphp 18752 0 - Live 0xffffffffa0000000
  SourcePackage: linux

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