Patch for FreeBSD 6.2 jails
I’ve actually made a number of changes after my original patch in the past month or so to fix a number of problems with page faults from the original patch. These page faults were caused by a null pointer in thread structures during forking. It seems to be fairly easy to demonstrate this issue by executing any program that does a decent amount of forking from inside a jail. I’m not exactly sure why these values are null, but it seems to be well outside the context of these patches. I added some simple checks for this null value and that seems to have cleared things up.
You can download the new patch here. It applies against the original version of src/sys/kern/kern_jail.c so you will need to revert it if you had previously tried to patch it.
I’ve done this work on 6.2 so I can’t say if this patch will work on other versions. This patch also includes the changes to get memory limits to be displayed. Let me know how it goes.