using resize2fs on an ext4 filesystem will corrupt it

[Kees Cook]

In a large fs that I resized, on reboot, it was terribly corrupted. fsck took hours, with lots of reports of things like:

File ... (inode #44403251, mod time Wed Dec 31 16:00:40 1969)
  has 1 multiply-claimed block(s), shared with 4 file(s):
 <filesystem metadata>
 ... (inode #45340665, mod time Wed Feb 18 09:04:29 2032)
 ... (inode #45147750, mod time Sat Jun 1 22:47:44 1985)
 ... (inode #45141106, mod time Sat Sep 5 05:31:28 1992)
Clone multiply-claimed blocks? yes

I was able to reproduce generating an unclean fs in a minimal test case. In Maverick and Lucid, the final fsck returns clean. In Natty, the final fsck reports things like this:

Pass 5: Checking group summary information
Block bitmap differences: +(2621440--2621951) +(2654210--2655360) +(2686976--2687487) +(2719744--2720255) +(2752512--2753023) +(2785280--2785791) +(2818048--2818559) +(2850816--2851327) +(2883584--2884095) +(2916352--2916863) +(2949120--2949631) +(2981888--2982399) +(3014656--3015167) +(3047424--3047935) +(3080192--3080703) +(3112960--3113471) +(3145728--3146239) +(3178496--3179007) +(3211264--3211775) +(3244032--3244543) +(3276800--3277311) +(3309568--3310079) +(3342336--3342847) +(3375104--3375615) +(3407872--3408383) +(3440640--3441151) +(3473408--3473919) +(3506176--3506687) +(3538944--3539455) +(3571712--3572223) +(3604480--3604991) +(3637248--3637759) +(3670016--3670527) +(3702784--3703295) +(3735552--3736063) +(3768320--3768831) +(3801088--3801599) +(3833856--3834367) +(3866624--3867135) +(3899392--3899903)
Fix? no

Free blocks count wrong for group #80 (32254, counted=32766).
Fix? no

Reproducer attached.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.37-10-generic 2.6.37-10.24
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.37-10.24-generic 2.6.37-rc6
Uname: Linux 2.6.37-10-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
AplayDevices:
 shm_open() failed: Permission denied
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC268 Analog [ALC268 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: kees 4631 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xe0420000 irq 43'
   Mixer name : 'Realtek ALC268'
   Components : 'HDA:10ec0268,80860000,00100003'
   Controls : 17
   Simple ctrls : 11
Date: Mon Dec 20 11:11:36 2010
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 LC_MESSAGES=en_US.utf8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-2.6.37-10-generic root=/dev/mapper/systemvg-root2lv ro vt.handoff=7 quiet splash
RelatedPackageVersions: linux-firmware 1.42
RfKill:

SourcePackage: linux
WpaSupplicantLog:

dmi.bios.date: 09/22/2008
dmi.bios.vendor: Intel Corp.
dmi.bios.version: JOQ3510J.86A.0954.2008.0922.2331
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: DQ35JO
dmi.board.vendor: Intel Corporation
dmi.board.version: AAD82085-800
dmi.chassis.type: 3
dmi.modalias: dmi:bvnIntelCorp.:bvrJOQ3510J.86A.0954.2008.0922.2331:bd09/22/2008:svn:pn:pvr:rvnIntelCorporation:rnDQ35JO:rvrAAD82085-800:cvn:ct3:cvr:

[Kees Cook (kees)]

Note that this is a kernel problem, not a e2fsprogs problem since running this test in a Maverick chroot (running under a Natty kernel) results in the same broken behavior.

[Brian Murray (brian-murray)]

I'm setting this to Triaged as it has been recreated upstream and is being worked on.

[Kees Cook (kees)]

This was fixed in the -12 natty kernel.