cannot create locks: cannot allocate shared memory for locks

Observe current value:

sysctl -a | grep shmmni

For debugging:

ipcs -a
ipcs -lm

Please make sure file '/etc/sysctl.conf' contains:

kernel.shmmni=8192

And apply changes instantly:

sysctl -p

See if the value is active:

cat /proc/sys/kernel/shmmni