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According to intro(2):
30 EROFS Read-only file system
An attempt to modify a file or direc-
tory was made on a device mounted
13 EACCES Permission denied
An attempt was made to access a file
in a way forbidden by the protection
It looks to me as though /var/coreloc was a read-only file system at 22:18:00. The next error message indicates that something changed but it's still not writable. Perhaps there's an NFS file system mounted at /var/coreloc and it is not exported in such a way that it is writable by root.
You posted this question in the zones forum. Is there a reason that you suspect something specific to zones is to blame or were you just having problems finding the right forum?
Check with "coreadm" the location of the core files. Make sure that the directory exist and has read/write permissions.