Why can't I dtrace processes running in a jail from the host?

Patrick M. Hausen hausen at punkt.de
Thu Aug 9 11:09:09 UTC 2018

Hi all,

I'm wondering why on a busy hosting server with hundreds of PHP-FPM
workers running in jails "dtrace -l" on the host does not show any
PHP specific probes. PHP *is* compiled with dtrace support for all the

Enabling /dev/dtrace/* via devfs.rules for a specific jail and then repeating
the process *inside* the jail works as expected.

Shouldn't jailed processes be transparently visible from the host system
but not vice versa?

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