Asmlib ASM:/opt/oracle/extapi/64/asm/orcl/1/libasm.so op asm_open error Operation not permitted

PROBLEM:
----------------

asmlib ASM:/opt/oracle/extapi/64/asm/orcl/1/libasm.so op asm_open error Operation not permitted


SOLUTION:
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To prevent ASMLIB from discovering the same disk more than once it needs to be forced to look only at /dev/dm*  and ignore all /dev/sd* devices.

1. either edit the file /etc/sysconfig/oracleasm-_dev_oracleasm    and change the lines:

ORACLEASM_SCANORDER=""
ORACLEASM_SCANEXCLUDE=""
to

ORACLEASM_SCANORDER="dm"
ORACLEASM_SCANEXCLUDE="sd"
or alternatively run the following command (as user root)

/usr/sbin/oracleasm configure -i -e -u user -g group -o "dm" -x "sd"

2. stop & restart ASMLIB as user root using:

/usr/sbin/oracleasm exit
/usr/sbin/oracleasm init
/usr/sbin/oracleasm scandisks

3. restart CRS or reboot node