On Jul 6, 2023, at 20:42, Mike Karels <m...@karels.net> wrote: > > > Thanks for isolating this. Let me know when you have the bug number. > I just tested a fix (the compat code drops the reference on the current > address space an extra time, probably freeing it). > > Mike
The bug was introduced in January, 2022. It allows 32 bit binaries to crash a 64 bit system when COMPAT_FREEBSD32 is on. Test coverage of the buggy function (sysctl_kern_proc_vm_layout) was added at the same time. There should be routine runs of 32 bit test suites on 64 bit systems. Although i386 and armv7 are tier 2 systems, the tier 1 COMPAT_FREEBSD32 kernel code needs to be exercised. This bug was only discovered by manually running tests in the right environment, 17 months after automated testing could have discovered it.
