[Pacemaker] Is there any character which must not be used for an attribute name?

[yusuke iida]

Hi, Andrew

crmd took out core in the environment which I am using, and the
phenomenon of stopping occurred.

Pacemaker currently used is the following.
Pacemaker-1.1.10-rc3(changeset 7209c02a0e0435024a104d40e2165a18b6288dec)

If STONITH occurs in the state where "(" is attached to the attribute
of the node, this problem will occur.

question:
Is there any character which must not be used for an attribute name?

Regards,
Yusuke
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Yusuke Iida
Mail: yusk.iida at gmail.com
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