Bug#772848: ext3 fs gets ext4_mb_release_inode_pa error, remounted read-only)
It turns out that this is not the first time I've seen this bug, it
happened on another VM (on another physical machine).
The storage stack is similar:
On the host (3.16-0.bpo.2-amd64): mdadm raid (2 SATA disks)
LVM
On the guest (3.16-0.bpo.2-amd64) LVM2, ext3 filesystem.
Dec 10 22:33:24 cedric kernel: [646155.908027] EXT4-fs (dm-1): pa ffff880103533160: logic 32, phys. 789350252, len 96
Dec 10 22:33:24 cedric kernel: [646155.944885] EXT4-fs error (device dm-1): ext4_mb_release_inode_pa:3773: group 24089, free 34, pa_free 32
Dec 10 22:33:24 cedric kernel: [646155.947737] Aborting journal on device dm-1-8.
Dec 10 22:33:25 cedric kernel: [646156.258525] EXT4-fs (dm-1): Remounting filesystem read-only
Dec 11 11:20:44 cedric kernel: [692195.795880] EXT4-fs error (device dm-1): ext4_put_super:792: Couldn't clean up the journal
... fsck'd here
Dec 11 11:21:48 cedric kernel: [692259.615214] EXT4-fs (dm-1): mounting ext3 file system using the ext4 subsystem
Dec 11 11:21:48 cedric kernel: [692259.657377] EXT4-fs (dm-1): mounted filesystem with ordered data mode. Opts: errors=remount-ro
On the same system I'm also seeing:
Dec 7 11:16:19 cedric kernel: [346330.080063] EXT4-fs (dm-0): error count since last fsck: 3
Dec 7 11:16:19 cedric kernel: [346330.080070] EXT4-fs (dm-0): initial error at time 1417556618: ext4_mb_release_inode_pa:3773
Dec 7 11:16:19 cedric kernel: [346330.080074] EXT4-fs (dm-0): last error at time 1417596801: ext4_remount:4853
Dec 8 11:18:06 cedric kernel: [432837.600121] EXT4-fs (dm-0): error count since last fsck: 3
Dec 8 11:18:06 cedric kernel: [432837.600170] EXT4-fs (dm-0): initial error at time 1417556618: ext4_mb_release_inode_pa:3773
Dec 8 11:18:06 cedric kernel: [432837.600174] EXT4-fs (dm-0): last error at time 1417596801: ext4_remount:4853
Dec 9 11:19:54 cedric kernel: [519345.120055] EXT4-fs (dm-0): error count since last fsck: 3
Dec 9 11:19:54 cedric kernel: [519345.120093] EXT4-fs (dm-0): initial error at time 1417556618: ext4_mb_release_inode_pa:3773
Dec 9 11:19:54 cedric kernel: [519345.120097] EXT4-fs (dm-0): last error at time 1417596801: ext4_remount:4853
Dec 10 11:21:41 cedric kernel: [605852.640041] EXT4-fs (dm-0): error count since last fsck: 3
Dec 10 11:21:41 cedric kernel: [605852.640076] EXT4-fs (dm-0): initial error at time 1417556618: ext4_mb_release_inode_pa:3773
Dec 10 11:21:41 cedric kernel: [605852.640080] EXT4-fs (dm-0): last error at time 1417596801: ext4_remount:4853
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