Comment 4 for bug 1811248

strace does not seem to be the tool to figure out the info you are asking for. Considering that the pid of the involved processes would be unknown at the time of starting strace. And executing the process(es) from the cli along with strace will not bear fruit for the case.

Going back to the log message I would reckon that MOUNT_NAMESPACES is in play, in particular recursive MS_SLAVE. Would be that be supported by AA in general and with the profile in particular?