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[Bug 1410480] Re: 3.18 overlayfs: renaming existing file leaves whiteout visible

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Ryan Tandy <1410480@xxxxxxxxxxxxxxxxxx>
Date: Tue, 13 Jan 2015 20:18:44 -0000
Reply-to: Bug 1410480 <1410480@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Description changed:

  On a recent vivid livecd, after I rename a file that exists in the lower
  filesystem, the whiteout entry is visible.
  
  root@ubuntu:~# ls -l /etc/fstab
  -rw-r--r-- 1 root root 63 Jan 13 11:56 /etc/fstab
  root@ubuntu:~# mv /etc/fstab /etc/fstab.renamed
  root@ubuntu:~# ls -l /etc/fstab*
  c--------- 1 root root 0, 0 Jan 13 19:57 /etc/fstab
  -rw-r--r-- 1 root root   63 Jan 13 11:56 /etc/fstab.renamed
  root@ubuntu:~#
  
  It still happens if I trigger a copy-up first by editing the file.
  
- When I rename a directory that exists in the lower filesystem, the
- kernel crashes.
- 
- root@ubuntu:~# mv /root /root.renamed
- 
- [  441.433199] BUG: unable to handle kernel NULL pointer dereference at 0000000000000016
- [  441.433728] IP: [<ffffffff81216100>] __detach_mounts+0x40/0xa0
- [  441.434227] PGD 230449067 PUD 22a2a6067 PMD 0
- [  441.434718] Oops: 0000 [#1] SMP
- [  441.435211] Modules linked in: snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi dm_crypt snd_hda_intel snd_hda_controller joydev snd_hda_codec snd_hwdep snd_mpu401_uart snd_pcm dm_multipath scsi_dh snd_seq_midi snd_seq_midi_event snd_rawmidi kvm_amd k10temp snd_seq kvm edac_core edac_mce_amd serio_raw snd_seq_device snd_timer snd shpchp ns558 gameport 8250_fintek i2c_nforce2 soundcore mac_hid parport_pc ppdev lp bnep rfcomm parport bluetooth squashfs overlay nfsv3 nfs_acl nfs lockd grace sunrpc fscache dm_mirror dm_region_hash dm_log hid_generic usbhid hid nouveau mxm_wmi wmi video i2c_algo_bit ttm drm_kms_helper r8169 psmouse pata_acpi mii drm sata_nv pata_amd
- [  441.438138] CPU: 3 PID: 3494 Comm: mv Not tainted 3.18.0-8-generic #9-Ubuntu
- [  441.438705] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./M61PMP/M61PMP-K, BIOS 080015  06/07/2010
- [  441.439286] task: ffff8800bb439400 ti: ffff88022936c000 task.ti: ffff88022936c000
- [  441.439862] RIP: 0010:[<ffffffff81216100>]  [<ffffffff81216100>] __detach_mounts+0x40/0xa0
- [  441.440507] RSP: 0018:ffff88022936fe38  EFLAGS: 00010206
- [  441.441182] RAX: 0000000058985898 RBX: fffffffffffffffe RCX: 000000000000000e
- [  441.441859] RDX: 0000000000005898 RSI: ffffffffffffffff RDI: ffffffff81c0c484
- [  441.442536] RBP: ffff88022936fe48 R08: 0000000000000000 R09: 0000000000000246
- [  441.443216] R10: ffffffff81196347 R11: 0000000008000080 R12: ffff8800bb3464d8
- [  441.443890] R13: ffff8800bb0cfd98 R14: 00000000ffffff9c R15: 0000000000000000
- [  441.444566] FS:  00007f15124d9840(0000) GS:ffff88023fcc0000(0000) knlGS:0000000000000000
- [  441.445237] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
- [  441.445912] CR2: 0000000000000016 CR3: 00000002291bb000 CR4: 00000000000007e0
- [  441.446588] Stack:
- [  441.447260]  ffff88022936fe48 ffff8800bb346480 ffff88022936fe78 ffffffff811feb0f
- [  441.447946]  ffff88022936fe68 ffff88022f866000 0000000000000000 0000000001f1ea30
- [  441.448639]  ffff88022936ff68 ffffffff81204983 ffff8800bb346480 ffff88022936fea8
- [  441.449335] Call Trace:
- [  441.450028]  [<ffffffff811feb0f>] vfs_rmdir+0x12f/0x140
- [  441.450712]  [<ffffffff81204983>] do_rmdir+0x203/0x220
- [  441.451407]  [<ffffffff811f522e>] ? ____fput+0xe/0x10
- [  441.452098]  [<ffffffff81092fcc>] ? task_work_run+0xbc/0xf0
- [  441.452787]  [<ffffffff810141a7>] ? do_notify_resume+0x97/0xb0
- [  441.453455]  [<ffffffff81205d85>] SyS_unlinkat+0x25/0x40
- [  441.454118]  [<ffffffff817b4ded>] system_call_fastpath+0x16/0x1b
- [  441.454767] Code: 83 ec 08 e8 a3 c9 59 00 48 89 df e8 cb d3 ff ff 48 85 c0 48 89 c3 74 58 48 c7 c7 84 c4 c0 81 e8 a7 e6 59 00 83 05 80 63 9f 00 01 <48> 8b 53 18 48 85 d2 74 21 0f 1f 80 00 00 00 00 48 8d ba 10 ff
- [  441.456342] RIP  [<ffffffff81216100>] __detach_mounts+0x40/0xa0
- [  441.457022]  RSP <ffff88022936fe38>
- [  441.457690] CR2: 0000000000000016
- [  441.458432] ---[ end trace ffd56c29f994b570 ]---
- 
- Files and directories that exist only in the upper filesystem (created
- after booting the livecd) work properly.
+ Files that exist only in the upper filesystem (created after booting the
+ livecd) work properly.
  
  On utopic, everything works properly. I have not tested a 3.17 kernel.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.18.0-8-generic 3.18.0-8.9
  ProcVersionSignature: Ubuntu 3.18.0-8.9-generic 3.18.1
  Uname: Linux 3.18.0-8-generic x86_64
  ApportVersion: 2.15.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/by-path', '/dev/snd/hwC1D3', '/dev/snd/hwC1D2', '/dev/snd/hwC1D1', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D9p', '/dev/snd/pcmC1D8p', '/dev/snd/pcmC1D7p', '/dev/snd/pcmC1D3p', '/dev/snd/controlC1', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CasperVersion: 1.347
  Date: Tue Jan 13 19:42:41 2015
  IwConfig:
-  eth0      no wireless extensions.
-  
-  lo        no wireless extensions.
+  eth0      no wireless extensions.
+ 
+  lo        no wireless extensions.
  LiveMediaBuild: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150113)
  Lsusb:
-  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
-  Bus 002 Device 003: ID 046d:c31c Logitech, Inc. Keyboard K120 for Business
-  Bus 002 Device 002: ID 413c:3012 Dell Computer Corp. Optical Wheel Mouse
-  Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 002 Device 003: ID 046d:c31c Logitech, Inc. Keyboard K120 for Business
+  Bus 002 Device 002: ID 413c:3012 Dell Computer Corp. Optical Wheel Mouse
+  Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcEnviron:
-  TERM=rxvt-unicode-256color
-  PATH=(custom, no user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  TERM=rxvt-unicode-256color
+  PATH=(custom, no user)
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: initrd=hostname/vivid/desktop/amd64/casper/initrd.lz boot=casper netboot=nfs nfsroot=10.0.2.1:/var/lib/tftpboot/hostname/vivid/desktop/amd64 quiet splash file=/cdrom/preseed/hostname.seed url=http://10.0.2.64/preseed/ubiquity.cfg text BOOT_IMAGE=hostname/vivid/desktop/amd64/casper/vmlinuz.efi
  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.
+  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-3.18.0-8-generic N/A
-  linux-backports-modules-3.18.0-8-generic  N/A
-  linux-firmware                            1.140
+  linux-restricted-modules-3.18.0-8-generic N/A
+  linux-backports-modules-3.18.0-8-generic  N/A
+  linux-firmware                            1.140
  RfKill:
-  
+ 
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/07/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 080015
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: M61PMP/M61PMP-K
  dmi.board.vendor: FOXCONN
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080015:bd06/07/2010:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnFOXCONN:rnM61PMP/M61PMP-K:rvr1.0:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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https://bugs.launchpad.net/bugs/1410480

Title:
  3.18 overlayfs: renaming existing file leaves whiteout visible

Status in linux package in Ubuntu:
  New

Bug description:
  On a recent vivid livecd, after I rename a file that exists in the
  lower filesystem, the whiteout entry is visible.

  root@ubuntu:~# ls -l /etc/fstab
  -rw-r--r-- 1 root root 63 Jan 13 11:56 /etc/fstab
  root@ubuntu:~# mv /etc/fstab /etc/fstab.renamed
  root@ubuntu:~# ls -l /etc/fstab*
  c--------- 1 root root 0, 0 Jan 13 19:57 /etc/fstab
  -rw-r--r-- 1 root root   63 Jan 13 11:56 /etc/fstab.renamed
  root@ubuntu:~#

  It still happens if I trigger a copy-up first by editing the file.

  Files that exist only in the upper filesystem (created after booting
  the livecd) work properly.

  On utopic, everything works properly. I have not tested a 3.17 kernel.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.18.0-8-generic 3.18.0-8.9
  ProcVersionSignature: Ubuntu 3.18.0-8.9-generic 3.18.1
  Uname: Linux 3.18.0-8-generic x86_64
  ApportVersion: 2.15.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/by-path', '/dev/snd/hwC1D3', '/dev/snd/hwC1D2', '/dev/snd/hwC1D1', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D9p', '/dev/snd/pcmC1D8p', '/dev/snd/pcmC1D7p', '/dev/snd/pcmC1D3p', '/dev/snd/controlC1', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CasperVersion: 1.347
  Date: Tue Jan 13 19:42:41 2015
  IwConfig:
   eth0      no wireless extensions.

   lo        no wireless extensions.
  LiveMediaBuild: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150113)
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 003: ID 046d:c31c Logitech, Inc. Keyboard K120 for Business
   Bus 002 Device 002: ID 413c:3012 Dell Computer Corp. Optical Wheel Mouse
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcEnviron:
   TERM=rxvt-unicode-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: initrd=hostname/vivid/desktop/amd64/casper/initrd.lz boot=casper netboot=nfs nfsroot=10.0.2.1:/var/lib/tftpboot/hostname/vivid/desktop/amd64 quiet splash file=/cdrom/preseed/hostname.seed url=http://10.0.2.64/preseed/ubiquity.cfg text BOOT_IMAGE=hostname/vivid/desktop/amd64/casper/vmlinuz.efi
  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-3.18.0-8-generic N/A
   linux-backports-modules-3.18.0-8-generic  N/A
   linux-firmware                            1.140
  RfKill:

  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/07/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 080015
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: M61PMP/M61PMP-K
  dmi.board.vendor: FOXCONN
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080015:bd06/07/2010:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnFOXCONN:rnM61PMP/M61PMP-K:rvr1.0:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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References

[Bug 1410480] [NEW] 3.18 overlayfs doesn't rename existing files/dirs properly
From: Ryan Tandy, 2015-01-13