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[Lauri Tirkkonen <1232473@xxxxxxxxxxxxxxxxxx>]

We also ran into this on one of our machines. depmod seems to be writing
to the file in question in a loop:

    # strace -s 100 -p $(pgrep depmod)
    write(3, "0x00\nnvidia_304           0x2887      0xfbad  0x00      0x0000  0x00\nnvidia_304           0x2887    "..., 4096) = 4096

    Attaching to process 17565
    Reading symbols from /sbin/depmod...(no debugging symbols found)...done.
    Reading symbols from /lib/x86_64-linux-gnu/libc.so.6...Reading symbols from /usr/lib/debug/lib/x86_64-linux-gnu/libc-2.15.so...done.
    done.
    Loaded symbols for /lib/x86_64-linux-gnu/libc.so.6
    Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug/lib/x86_64-linux-gnu/ld-2.15.so...done.
    done.
    Loaded symbols for /lib64/ld-linux-x86-64.so.2
    0x00007fed6ba89040 in __write_nocancel () at ../sysdeps/unix/syscall-template.S:82
    82      ../sysdeps/unix/syscall-template.S: No such file or directory.
    (gdb) bt
    #0  0x00007fed6ba89040 in __write_nocancel () at ../sysdeps/unix/syscall-template.S:82
    #1  0x00007fed6ba1b883 in _IO_new_file_write (f=0x18164b0, data=0x7fed621c2000, n=4096) at fileops.c:1289
    #2  0x00007fed6ba1b74a in new_do_write (fp=0x18164b0, 
        data=0x7fed621c2000 "0x00\nnvidia_304", ' ' <repeats 11 times>, "0x2887      0xfbad  0x00      0x0000  0x00\nnvidia_304", ' ' <repeats 11 times>, "0x2887      0xfbad  0x00      0x0000  0x00\nnvidia_304", ' ' <repeats 11 times>, "0x2887      0xfbad  0x00      0x0000  0x00\nnvi"..., to_do=4096) at fileops.c:543
    #3  0x00007fed6ba1ceb5 in _IO_new_do_write (fp=<optimized out>, data=<optimized out>, to_do=4096) at fileops.c:516
    #4  0x00007fed6ba1c025 in _IO_new_file_xsputn (n=4, data=<optimized out>, f=0x18164b0) at fileops.c:1371
    #5  _IO_new_file_xsputn (f=0x18164b0, data=<optimized out>, n=4) at fileops.c:1305
    #6  0x00007fed6b9ec4a7 in _IO_vfprintf_internal (s=<optimized out>, format=<optimized out>, ap=<optimized out>) at vfprintf.c:1660
    #7  0x00007fed6baab80b in ___fprintf_chk (fp=0x18164b0, flag=1, format=<optimized out>) at fprintf_chk.c:37
    #8  0x0000000000405a24 in ?? ()
    #9  0x00000000004021a4 in ?? ()
    #10 0x00007fed6b9c376d in __libc_start_main (main=0x401770, argc=5, ubp_av=0x7fff69f88ea8, init=<optimized out>, fini=<optimized out>, 
        rtld_fini=<optimized out>, stack_end=0x7fff69f88e98) at libc-start.c:226
    #11 0x0000000000402535 in ?? ()
    #12 0x00007fff69f88e98 in ?? ()
    #13 0x000000000000001c in ?? ()
    #14 0x0000000000000005 in ?? ()
    #15 0x00007fff69f8ae05 in ?? ()
    #16 0x00007fff69f8ae12 in ?? ()
    #17 0x00007fff69f8ae26 in ?? ()
    #18 0x00007fff69f8ae29 in ?? ()
    #19 0x00007fff69f8ae15 in ?? ()
    #20 0x0000000000000000 in ?? ()

I'll build module-init-tools with debug symbols and try to reproduce.

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https://bugs.launchpad.net/bugs/1232473

Title:
  depmod fills disk to 100% with invisible modules.ccwmap

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I ran update manager, it was installing a new kernel
  (3.2.0-54-generic). Then an error dialog/message popped up that the
  disk (root partition) was full, the dialog had two buttons (examine -
  starts baobab and skip/cancel).

  At first I tried to find any big files (du didn't help, showed that
  only 8GB of 20GB was used). Long story short, googled a bit about why
  df and du might disagree and someone recommended lsof | grep deleted.

  depmod (i think) had created a file and deleted it then kept writing
  to it filling up my root partition. In the end I had to kill it,
  because it just kept writing to it even when I zeroed out that deleted
  file.

  Here's a log (shortened) of what I typed in the console:

  root@localhost:/# lsof | grep deleted | grep depmod
  depmod     8673       root    3w      REG                8,1 14525296640     676388 /lib/modules/3.2.0-54-generic/modules.ccwmap (deleted)

  root@localhost:/# cd /proc/8673/fd

  root@localhost:/proc/8673/fd# ll -h | grep ccwmap
  l-wx------ 1 root root 64 sep 28 16:52 3 -> /lib/modules/3.2.0-54-generic/modules.ccwmap (deleted)

  root@localhost:/proc/8673/fd# > 3

  root@localhost:/proc/8673/fd# df -h | grep sda1
  /dev/sda1               22G  9,3G   12G  45% /

  root@localhost:/proc/8673/fd# lsof | grep deleted | grep depmod
  depmod     8673       root    3w      REG                8,1 27424661504     676388 /lib/modules/3.2.0-54-generic/modules.ccwmap (deleted)

  root@localhost:/proc/8673/fd# df -h | grep sda1
  /dev/sda1               22G   22G     0 100% /

  root@localhost:/proc/8673/fd# > 3

  root@localhost:/proc/8673/fd# df -h | grep sda1
  /dev/sda1               22G  8,8G   13G  42% /

  root@localhost:/proc/8673/fd# df -h | grep sda1
  /dev/sda1               22G   11G   11G  49% /

  root@localhost:/proc/8673/fd# pkill depmod

  Seems I'm not the only one who's seen this issue with kernel updates:
  http://askubuntu.com/questions/157740/updating-to-linux-image-3-2-0-26
  -generic-occupies-all-disk-space

  ---
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.4
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  andris     2142 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf1c00000 irq 50'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:10ec0269,10280446,00100100 HDA:80862805,80860101,00100000'
     Controls      : 25
     Simple ctrls  : 12
  DistroRelease: Ubuntu 12.04
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MachineType: Dell Inc. Dell System XPS 15Z
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-53-generic root=UUID=9543673d-3cae-4de0-ad02-31f9d0ae1614 ro quiet splash elevator=noop vt.handoff=7
  ProcVersionSignature: Ubuntu 3.2.0-53.81-generic 3.2.50
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-53-generic N/A
   linux-backports-modules-3.2.0-53-generic  N/A
   linux-firmware                            1.79.6
  StagingDrivers: mei
  Tags:  precise running-unity staging
  Uname: Linux 3.2.0-53-generic x86_64
  UpgradeStatus: Upgraded to precise on 2012-06-02 (482 days ago)
  UserGroups: adm admin cdrom dialout fuse lpadmin plugdev sambashare vboxusers wireshark
  dmi.bios.date: 08/11/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0MFNCV
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd08/11/2011:svnDellInc.:pnDellSystemXPS15Z:pvr:rvnDellInc.:rn0MFNCV:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS 15Z
  dmi.sys.vendor: Dell Inc.

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