Hi all! I'm having kernel panic randomically with cirros image. Sometimes the instances boots, sometimes not. I'm using Openstack Queens, Ubuntu Server 18.04 and KVM (following the install guide). The nova/instances directory, where are stored ephemeral disks, is over a GlusterFS system. I've noted that other images, like Ubuntu Cloud Image, do not get this error. It's just with cirros and sometimes. I appreciate any help guiding on where I can look for to identify what is causing these errors. I've analyzed libvirt logs and them show just a launched instance, everything ok. The _base/<ID> file used to launch the instances is the same that is used with cirros instances that worked (it's in a GlusterFS). Something got wrong during the instance boot process. Boot log: [ 1.586076] EDD information not available. [ 1.590261] Freeing unused kernel memory: 1480K (ffffffff81f42000 - ffffffff820b4000) [ 1.594823] Write protecting the kernel read-only data: 14336k [ 1.598951] Freeing unused kernel memory: 1860K (ffff88000182f000 - ffff880001a00000) [ 1.625178] Freeing unused kernel memory: 168K (ffff880001dd6000 - ffff880001e00000) info: initramfs: up at 1.07 modprobe: module virtio_pci not found in modules.dep modprobe: module virtio_blk not found in modules.dep modprobe: module virtio_net not found in modules.dep modprobe: module vfat not found in modules.dep modprobe: module nls_cp437 not found in modules.dep info: copying initramfs to /dev/vda1 [ 2.028648] jbd2_journal_bmap: journal block not found at offset 12 on vda1-8 [ 2.034075] Aborting journal on device vda1-8. mount: mounting /dev on ./dev failed: No such file or directory info: initramfs loading root from /dev/vda1 switch_root: can't execute '/sbin/init': No such file or directory [ 2.692399] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000100 [ 2.692399] [ 2.696061] CPU: 0 PID: 1 Comm: switch_root Not tainted 4.4.0-28-generic #47-Ubuntu [ 2.699012] Hardware name: OpenStack Foundation OpenStack Nova, BIOS 1.10.2-1ubuntu1 04/01/2014 [ 2.702373] 0000000000000086 000000004016d54a ffff88003e2fbe10 ffffffff813eb1a3 [ 2.705849] ffffffff81cb10d8 ffff88003e2fbea8 ffff88003e2fbe98 ffffffff8118bf57 [ 2.709353] ffff880000000010 ffff88003e2fbea8 ffff88003e2fbe40 000000004016d54a [ 2.712875] Call Trace: [ 2.714013] [<ffffffff813eb1a3>] dump_stack+0x63/0x90 [ 2.715995] [<ffffffff8118bf57>] panic+0xd3/0x215 [ 2.717840] [<ffffffff81184e1e>] ? perf_event_exit_task+0xbe/0x350 [ 2.720105] [<ffffffff81084541>] do_exit+0xae1/0xaf0 [ 2.722090] [<ffffffff810845d3>] do_group_exit+0x43/0xb0 [ 2.724150] [<ffffffff81084654>] SyS_exit_group+0x14/0x20 [ 2.726207] [<ffffffff818276b2>] entry_SYSCALL_64_fastpath+0x16/0x71 [ 2.729271] Kernel Offset: disabled [ 2.730741] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000100 Thank you!