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.

Thank you!

[    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
[    2.730741]