Happened again just a short while ago.  Here's the info from /boot/config-4.16.7-200.fc27.x86_64

CONFIG_SYSVIPC=y
CONFIG_SYSVIPC_SYSCTL=y
CONFIG_IPC_NS=y
CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION=y
CONFIG_ARCH_WANT_OLD_COMPAT_IPC=y
CONFIG_SYSVIPC_COMPAT=y
CONFIG_XFRM_IPCOMP=m
CONFIG_INET_IPCOMP=m
CONFIG_INET6_IPCOMP=m
CONFIG_NETFILTER_XT_MATCH_IPCOMP=m
CONFIG_TIPC=m
# CONFIG_TIPC_MEDIA_IB is not set
CONFIG_TIPC_MEDIA_UDP=y
CONFIG_ISDN_DIVAS_BRIPCI=y
CONFIG_ISDN_DIVAS_PRIPCI=y
CONFIG_PCIPCWATCHDOG=m
CONFIG_DVB_SMIPCIE=m
CONFIG_SND_CMIPCI=m
CONFIG_SND_SST_IPC=m
CONFIG_SND_SST_IPC_PCI=m
CONFIG_SND_SST_IPC_ACPI=m
# CONFIG_INTEL_PMC_IPC is not set
CONFIG_INTEL_PUNIT_IPC=m


Paolo


On 05/10/2018 10:29 AM, Samuel Sieb wrote:
On 05/10/2018 07:57 AM, Paolo Galtieri wrote:
Kernel not configured for semaphores (System V IPC). Not using udev synchronization code.
Halting.

Since I have not modified my kernel from what I downloaded when I did the most recent update I don't understand why this message is appearing. Both times it occurred during the night because I find it first thing in the morning.

Anyone have any idea what is causing this message to appear?

The message is incorrect.  I think I've seen it myself before and I've definitely seen various reports about it.  I believe it's an selinux issue related to the initramfs in some way.  Did you do any updates before rebooting?
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