[rdiff-backup-users] rdiff-backup --verify 1.2.8 running around in circles

[Marc Haber]

Hi,

I have an rdiff-backup directory that was corrupted by a file system
crash. As I don't want to lose the backup, I tried rdiff-backup
-v9 --verify on the repository. But already after a few seconds of
running, output stops at:

Sun Feb 20 08:28:51 2011  Verified SHA1 digest of etc/kde4/kdm/backgroundrc
Sun Feb 20 08:28:51 2011  Verified SHA1 digest of etc/kde4/kdm/kdm.options
Sun Feb 20 08:28:51 2011  Verified SHA1 digest of etc/kde4/kdm/kdmrc
Sun Feb 20 08:28:51 2011  Verified SHA1 digest of etc/kde4/kdm/kdmrc.dpkg-old
Sun Feb 20 08:28:51 2011  Verified SHA1 digest of etc/kde4/khotnewstuff.knsrc
Sun Feb 20 08:28:51 2011  Verified SHA1 digest of etc/kde4/kshorturifilterrc
Sun Feb 20 08:28:51 2011  Verified SHA1 digest of 
etc/kernel/postinst.d/initrSun Feb 20 08:28:51 2011  Warning: Could not restore 
file etc/kernel/postinst.d/initramfs-tools!

A regular file was indicated by the metadata, but could not be
constructed from existing increments because last increment had type
None.  Instead of the actual file's data, an empty length file will be
created.  This error is probably caused by data loss in the
rdiff-backup destination directory, or a bug in rdiff-backup
Sun Feb 20 08:28:51 2011  Warning: Computed SHA1 digest of 
etc/kernel/postinst.d/initramfs-tools
   da39a3ee5e6b4b0d3255bfef95601890afd80709
doesn't match recorded digest of
   e69689ccfb34f74c4ba64d1f1e842df083020b31
Your backup repository may be corrupted!

and rdiff-backup starts taking 100 % CPU and stopped accessing the
disk. This was not the first case of an increment of type None being
found and flagged as such.

>From a cursory look at an strace output, rdiff-backup seems to be
running around in the following loop:

getdents(4, /* 5 entries */, 32768)     = 152
getdents(4, /* 0 entries */, 32768)     = 0
close(4)                                = 0
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/etc/kernel/postinst.d/initramfs",
 {st_mode=S_IFREG|0755, st_size=612, ...}) = 0
open("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d",
 O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC)= 4
getdents(4, /* 7 entries */, 32768)     = 392
getdents(4, /* 0 entries */, 32768)     = 0
close(4)                                = 0
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/initramfs-tools.2009-02-23T22:12:47+01:00.missing",
 {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/initramfs-tools",
 0x7fff767d1d70) = -1 ENOENT (No such file or directory)
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/initramfs-tools.2010-03-31T00:15:24+02:00.diff.gz",
 {st_mode=S_IFREG|0755, st_size=283, ...}) = 0
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/initramfs-tools",
 0x7fff767d1d70) = -1 ENOENT (No such file or directory)
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/initramfs.2009-06-07T22:46:22+02:00.missing",
 {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/initramfs",
 x7fff767d1d70) = -1 ENOENT (Nosuch file or directory)
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/pm-utils.2009-11-15T08:54:51+01:00.missing",
 {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/pm-utils",
 0x7fff767d1d70) = -1 ENOENT (No such file or directory)
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/zg2-kernel-image.2009-12-05T21:38:11+01:00.missing",
 {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/zg2-kernel-image",
 0x7fff767d1d70) = -1 ENOENT (No such file or directory)
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/initramfs",
 0x7fff767d2260) = -1 ENOENT (No such file or directory)
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/initramfs.2009-06-07T22:46:22+02:00.missing",
 {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/etc/kernel/postinst.d/pm-utils",
 {st_mode=S_IFREG|0755, st_size=196, ...}) = 0
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/initramfs-tools",
 0x7fff767d2260) = -1 ENOENT (No such file or directory)
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/initramfs-tools.2009-02-23T22:12:47+01:00.missing",
 {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/initramfs-tools.2010-03-31T00:15:24+02:00.diff.gz",
 {st_mode=S_IFREG|0755, st_size=283, ...}) = 0
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/pm-utils",
 0x7fff767d2260) = -1 ENOENT (No such file or directory)
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/pm-utils.2009-11-15T08:54:51+01:00.missing",
 {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/etc/kernel/postinst.d/zg2-kernel-image",
 {st_mode=S_IFREG|0755, st_size=811, ...}) = 0
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/zg2-kernel-image",
 0x7fff767d2260) = -1 ENOENT (No such file or directory)
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d/zg2-kernel-image.2009-12-05T21:38:11+01:00.missing",
 {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/etc/kernel/postinst.d",
 {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/rdiff-backup-data/increments/etc/kernel/postinst.d",
 {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
open("/mnt/2t/var/local/manualbackups/rdiffbackup/swivel/swivel/etc/kernel/postinst.d",
 O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 4

Is this a known bug with an available patch? I have a copy of the
corrupted directory and am prepared to deliver data as necessary. I
am, however, far from being fluent in python and therefore can not
do any debug sessions myself.

Any hints?

Greetings
Marc

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