On Tue, Dec 06, 2016 at 11:22:17AM +0100, Michael Ströder wrote:
HI! On one qemu-kvm instance a kernel update failed and booting the image is not possible anymore (see below). A dozen other VMs are correctly working after the upgrade. Anything I can quickly try to make it work again?
What do you mean by "update failed"? Was the update cancelled in the middle, so that there may be newer kernel set up, but modules missing or something? If the machine was just killed in the middle of writing, the disk data might be corrupted and it depends on your configuration whether you just need to check the journal or just re-install it (in case there is no way to know what parts are corrupted). Try booting the older kernel (or newer one), or boot a rescue CD and fix the installation if possible. In any case, this is not related to qemu, and even more unrelated to libvirt.
(This is not really a bad emergency case because I could simply re-install and re-configure with ansible. But I'd like to learn about these cases...) Ciao, Michael. Loading Linux 4.8.12-1-default ... [ 0.651328] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) [ 0.654408] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.8.12-1-default #1 [ 0.656941] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.1-0-gb3ef39f-prebuilt.qemu-project.org 04/01/2014 [ 0.661166] 0000000000000000 ffffffff813a4252 ffff9a5348c4d000 ffff9a5349957e60 [ 0.664652] ffffffff8118e3fa ffff9a5300000010 ffff9a5349957e70 ffff9a5349957e08 [ 0.668124] ffffffff8118e715 ffff9a5349957e78 0000000000000001 0000000000000000 [ 0.671457] Call Trace: [ 0.672460] [<ffffffff8102eefe>] dump_trace+0x5e/0x310 [ 0.674389] [<ffffffff8102f2cb>] show_stack_log_lvl+0x11b/0x1a0 [ 0.676570] [<ffffffff81030001>] show_stack+0x21/0x40 [ 0.678480] [<ffffffff813a4252>] dump_stack+0x5c/0x7a [ 0.680369] [<ffffffff8118e3fa>] panic+0xd5/0x217 [ 0.682169] [<ffffffff81f56419>] mount_block_root+0x1fe/0x2c0 [ 0.684285] [<ffffffff81f56668>] prepare_namespace+0x12b/0x161 [ 0.686439] [<ffffffff81f56103>] kernel_init_freeable+0x1f6/0x20a [ 0.688675] [<ffffffff816c727a>] kernel_init+0xa/0x100 [ 0.690623] [<ffffffff816d485f>] ret_from_fork+0x1f/0x40 [ 0.696659] DWARF2 unwinder stuck at ret_from_fork+0x1f/0x40 [ 0.698858] [ 0.699533] Leftover inexact backtrace: [ 0.699533] [ 0.701580] [<ffffffff816c7270>] ? rest_init+0x90/0x90 [ 0.703944] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
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