On 05/10/2018 09:00 AM, stan wrote:
> On Thu, 10 May 2018 07:57:29 -0700
> Paolo Galtieri <pgalti...@gmail.com> wrote:
>
>> Folks,
>> twice now in the last 2 days when I have sat in front of my PC I
>> have found the following message on the screen:
>>
>> 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?
>
> This is probably something else other than the kernel that has a bug.
> You can check if your kernel has semaphores set by going into /boot and
> running
> grep -i -e 'IPC' [config file for your running kernel]
Easier command:
grep -i -e 'IPC' /boot/config-`uname -r`
> It should show something like
> CONFIG_SYSVIPC=y
> CONFIG_SYSVIPC_SYSCTL=y
> CONFIG_IPC_NS=y
> My suspicion would fall on systemd as a cause for your problem. But
> that's just a guess based on the error message, I haven't actually
> checked for the error message in the source.
On my F28 VM (updating as I write this, but...):
[root@fedora28-vm sysvipc]# uname -r
4.16.5-300.fc28.x86_64
[root@fedora28-vm sysvipc]# grep -i -e 'IPC' /boot/config-`uname -r`
CONFIG_SYSVIPC=y
CONFIG_SYSVIPC_SYSCTL=y
And:
[root@fedora28-vm sysvipc]# ls -l /proc/sysvipc
total 0
-r--r--r--. 1 root root 0 May 10 10:12 msg
-r--r--r--. 1 root root 0 May 10 10:12 sem
-r--r--r--. 1 root root 0 May 10 10:12 shm
which indicates that the SYSV IPC stuff IS there.
It'd be odd for a kernel to be built without semaphores as they are a
heavily-used IPC mechanism. Can you please let us know what version of
the kernel you're using? "uname -r" will give it to you (as I showed
above).
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- Rick Stevens, Systems Engineer, AllDigital ri...@alldigital.com -
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