This issue occurs on A/P arrays. If the voting disk loses connectivty to the primary paths, DMP takes some time to analyze the error and fail over the paths. During this time, the cssd reports a timeout and panics. When using Oracle ASM over DMP devices, set the disktimeout parameter to an appropriate value. This parameter indicates the maximum time allowed for a voting file I/O to complete. If this time is exceeded, the voting disk is marked as offline.

The default of disktimeout is 200. If the value of the tunable is less that this value, reset the value to the default value.