[PVE-User] Filesystem corruption on a VM?

Marco Gaiarin gaio at sv.lnf.it
Wed Nov 14 18:40:54 CET 2018

I come back on this:

> In a PVE 4.4 cluster i continue to get FS errors like:
>  Oct 22 20:51:10 vdmsv1 kernel: [268329.890910] EXT4-fs error (device sda6): ext4_mb_generate_buddy:758: group 932, block bitmap and bg descriptor inconsistent: 30722 vs 32768 free clusters
> and
>  Oct 23 09:43:16 vdmsv1 kernel: [314655.032561] EXT4-fs error (device sdb1): ext4_validate_block_bitmap:384: comm kworker/u8:2: bg 12: bad block bitmap checksum
>  Oct 23 09:43:16 vdmsv1 kernel: [314655.034265] EXT4-fs (sdb1): Delayed block allocation failed for inode 2632026 at logical offset 2048 with max blocks 1640 with error 74
>  Oct 23 09:43:16 vdmsv1 kernel: [314655.034335] EXT4-fs (sdb1): This should not happen!! Data will be lost
> Host run 4.4.134-1-pve kernel, and guest is a debian stretch
> (4.9.0-8-amd64), and in the same cluster, but also in other clusters, i
> have other stretch VMs running in the same host kernel, without
> troubles.

> Googling around lead me to old jessie bugs (kernels 3.16):
> 	https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1423672
> 	https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=818502#22

Seems the bug is really this. I've increased the RAM of the problematic
VM, and FS corruption deasppeared.

Effectively, all other VMs have plently of free ram, this was a bit

I know that PVE 4.4 is EOL, but still i'm seeking feedback. For
example, is a 'host' kernel bug, or a 'guest' kernel bug?


dott. Marco Gaiarin				        GNUPG Key ID: 240A3D66
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