DF-0019 / fix_run.log
=== PATCHED KERNEL (#1, with fix.diff applied) === kern.version: DragonFly 6.5-DEVELOPMENT #1: Sun Jul 12 15:35:41 UTC 2026 PoC run (/root/poc/DF-0019/df0019 24): [*] switching pid 870 to bsd4 scheduler... [+] now running under bsd4 scheduler. [*] setting kern.usched_bsd4.queue_checks=0... kern.usched_bsd4.queue_checks: 5 sysctl: kern.usched_bsd4.queue_checks=0: Invalid argument [*] forking 24 CPU-bound bsd4 kids... [*] parent survived, reaping kids... [*] survived — no panic (FIXED kernel or path not hit). exit 0. DF_EXIT=0 Valid values still accepted: sysctl kern.usched_bsd4.queue_checks=5 -> OK (5 -> 5) sysctl kern.usched_bsd4.queue_checks=1 -> OK (5 -> 1) sysctl kern.usched_bsd4.queue_checks=100 -> OK (1 -> 100) Rejected values: sysctl kern.usched_bsd4.queue_checks=0 -> Invalid argument sysctl kern.usched_bsd4.queue_checks=-1 -> Invalid argument sysctl kern.usched_bsd4.queue_checks=-999 -> Invalid argument Result: NO PANIC. Guest stayed up. Fix closes the bug.