Here we have this problem on two servers runnning "Intel(R) Xeon(R) CPU
X5460 @ 3.16GHz" (and debian 7.0 backport kernel 3.16 on host, 4.x on
VM). We doesn't seems to have this problem on others nodes runnning:
Intel(R) Xeon(R) CPU E5345 @ 2.33GHz
Intel(R) Xeon(R) CPU5160
Adding memory did not helps, but it seems to have fixed the issue by
just removing the fstab option errors=remount-ro on the mountpoints
having problems. It's usually only set on root fs and we have no problem
on root fs, but by mistake this option was added to other mountpoints
and triggered the
** Also affects: linux (Debian)
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ext4_mb_generate_buddy:756: group N, block
Same problem here on 2 VMs, appeared 4 times in one week.
VMs are running Debian Jessie, on Debian wheezy hypervisors running ceph
giant, libvirt 1.2.9-9~bpo70+1, qemu 1:2.1+dfsg-12~bpo70+1.
FS is ext4, using virtio and rbd with writeback.
After first crash we upgraded kernel to 4.1.6-1~bpo8+1.
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