Comment 0 for bug 1626394

Since the kernel upgrade from 4.4 to 4.8 in yakkety, systemd's TEST-08-ISSUE-2730 upstream test now consistently fails with:

+ timeout --foreground 180 /usr/bin/qemu-system-x86_64 -smp 1 -net none -m 512M -nographic -kernel /boot/vmlinuz-4.8.0-14-generic -drive format=raw,cache=unsafe,file=/var/tmp/systemd-test.4jlHRw/rootdisk.img -append 'root=/dev/sda1 raid=noautodetect loglevel=2 init=/lib/systemd/systemd ro console=ttyS0 selinux=0 systemd.unified_cgroup_hierarchy=no '
warning: TCG doesn't support requested feature: CPUID.01H:ECX.vmx [bit 5]
[ 1.491760] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[ 1.492153] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.8.0-14-generic #15-Ubuntu
[ 1.492153] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
[ 1.492153] 0000000000000086 0000000035700369 ffffffffa8b59c24 ffff97201dd45000
[ 1.492153] ffff97201e9afea0 ffffffffa8987431 0000000000000010 ffff97201e9afeb0
[ 1.492153] ffff97201e9afe48 0000000035700369 ffff97201e9afe58 ffff97201e9afeb8
[ 1.492153] Call Trace:
[ 1.492153] [<ffffffffa8b59c24>] ? dump_stack+0x5c/0x78
[ 1.492153] [<ffffffffa8987431>] ? panic+0xe4/0x226
[ 1.492153] [<ffffffffa95724f9>] ? mount_block_root+0x284/0x2c0
[ 1.492153] [<ffffffffa957187b>] ? set_debug_rodata+0xc/0xc
[ 1.492153] [<ffffffffa957268f>] ? prepare_namespace+0x12b/0x180
[ 1.492153] [<ffffffffa9572161>] ? kernel_init_freeable+0x1dd/0x1ed
[ 1.492153] [<ffffffffa8e2c0ea>] ? kernel_init+0xa/0x100
[ 1.492153] [<ffffffffa8e3949f>] ? ret_from_fork+0x1f/0x40
[ 1.492153] [<ffffffffa8e2c0e0>] ? rest_init+0x80/0x80
[ 1.492153] Kernel Offset: 0x27800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ 1.492153] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
qemu-system-x86_64: terminating on signal 15 from pid 8784

This only happens on amd64, i386 and ppc64el are fine.

I'll investigate more details, filing this for getting a reference for the britney hint.