Re,
On 06/11/2014 10:17 AM, Frederik Himpe wrote:
I am thinking of another thing the two affected systems have in common:
they use BTRFS and file systems are mounted noatime.
BTRFS seems to be the trigger. I've create two vanilla KVM VMs using
Jessie's netinst alpha CD-ROM image and virtio block devices with ext4
and btrfs as rootfs:
1) ext4: everything is fine
root@exttb:~# grep /usr/sbin/sshd /proc/1898/maps
7fa226c20000-7fa226cd5000 r-xp 00000000 fe:01 26941 /usr/sbin/sshd
7fa226ed5000-7fa226ed8000 r--p 000b5000 fe:01 26941 /usr/sbin/sshd
7fa226ed8000-7fa226ed9000 rw-p 000b8000 fe:01 26941 /usr/sbin/sshd
root@exttb:~# stat /usr/sbin/sshd
File: ‘/usr/sbin/sshd’
Size: 758440 Blocks: 1488 IO Block: 4096 regular file
Device: fe01h/65025d Inode: 26941 Links: 1
Access: (0755/-rwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2014-06-12 19:25:16.061519000 +0200
Modify: 2014-05-01 18:44:14.000000000 +0200
Change: 2014-06-12 19:22:54.228088000 +0200
Birth: -
2) btrfs: device IDs seems to be broken?!
root@btrtb:~# grep /usr/sbin/sshd /proc/1928/maps
7f05fb58b000-7f05fb640000 r-xp 00000000 00:10 66330 /usr/sbin/sshd
7f05fb840000-7f05fb843000 r--p 000b5000 00:10 66330 /usr/sbin/sshd
7f05fb843000-7f05fb844000 rw-p 000b8000 00:10 66330 /usr/sbin/sshd
root@btrtb:~# stat /usr/sbin/sshd
File: ‘/usr/sbin/sshd’
Size: 758440 Blocks: 1488 IO Block: 4096 regular file
Device: 11h/17d Inode: 66330 Links: 1
Access: (0755/-rwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2014-06-11 23:32:17.179767000 +0200
Modify: 2014-05-01 18:44:14.000000000 +0200
Change: 2014-06-11 23:28:55.148348000 +0200
Birth: -
Hmm, the device id reported by stat seems to be broken, too:
root@btrtb:~# mount |grep ' on / '
/dev/vda1 on / type btrfs (rw,relatime,space_cache)
root@btrtb:~# ls -lha /dev/vda1
brw-rw---- 1 root disk 254, 1 Jun 11 23:32 /dev/vda1
This looks weird to me! After looking around I've found a bug at redhats
bug tracker (https://bugzilla.redhat.com/show_bug.cgi?id=711881)... it
seems to me that btrfs breaks the bijective device ID/inode concept :-/
Cheers,
Thomas
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