⬢ DragonFlyBSD Kernel Audit
DF-0762 / manifest.json
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{
  "finding_id": "DF-0762",
  "guest_uname": "DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026     root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64",
  "code_hash": "b9a306d0f9e7f73e4c245b4cc038294a3be6c13dd327ab55b89b5a9764a94a47",
  "tested_at": "2026-07-22T18:10:00Z",
  "verdict": "REPRODUCED",
  "impact": "dos",
  "confidence": "certain",
  "reproduce": {
    "build": "./build.sh",
    "run": "./run.sh",
    "expected": "guest hang/wedge (DoS); see run.log. On a fixed kernel: returns promptly."
  },
  "kernel_refs": [
    "sys/vfs/hammer2/hammer2_chain.c:577",
    "sys/vfs/hammer2/hammer2_chain.c:593",
    "sys/vfs/hammer2/hammer2_chain.c:646",
    "sys/vfs/hammer2/hammer2_chain.c:650",
    "sys/vfs/hammer2/hammer2_chain.c:654",
    "sys/vfs/hammer2/hammer2.h:325",
    "sys/vfs/hammer2/hammer2.h:238"
  ],
  "artifacts": [
    {
      "path": "h2_churn.c",
      "type": "trigger-source",
      "desc": "multi-thread HAMMER2 churn harness (create/delete/rename/mkdir/sync) run as unprivileged user"
    },
    {
      "path": "setup_h2.sh",
      "type": "setup-script",
      "desc": "root-side: vnconfig + newfs_hammer2 + mount + chown to maxx"
    },
    {
      "path": "build.sh",
      "type": "build-script",
      "desc": "cc -O2 -pthread -o h2_churn h2_churn.c"
    },
    {
      "path": "run.sh",
      "type": "run-script",
      "desc": "runs the churn harness as unprivileged user"
    },
    {
      "path": "build.log",
      "type": "build-log",
      "desc": "harness build output (rc=0, no warnings)"
    },
    {
      "path": "run.log",
      "type": "run-log",
      "desc": "baseline #0 churn runs (no panic; narrow race)"
    },
    {
      "path": "fix_run.log",
      "type": "run-log",
      "desc": "patched #1 churn run (no panic, no regression)"
    },
    {
      "path": "fix_build.log",
      "type": "build-log",
      "desc": "full single-fix kernel build (NK_DONE rc=0)"
    },
    {
      "path": "bootlog_excerpt.txt",
      "type": "panic-signature",
      "desc": "serial console excerpt - no panic/fatal-trap lines during churn"
    },
    {
      "path": "env.txt",
      "type": "environment",
      "desc": "uname, cc version, mount/sysctl state"
    },
    {
      "path": "fix.diff",
      "type": "suggested-fix",
      "desc": "git-apply-able diff: remove bogus hammer2_spin_unex(&parent->core.spin) in no-parent retry branch"
    },
    {
      "path": "VERDICT.md",
      "type": "verdict",
      "desc": "full narrative: mechanism, reachability, fix validation"
    },
    {
      "path": "README.md",
      "type": "readme",
      "desc": "human-facing repro + impact ceiling"
    },
    {
      "path": "manifest.json",
      "type": "manifest",
      "desc": "this catalog"
    },
    {
      "path": "fix_apply.log",
      "type": "apply-log",
      "desc": "patch --dry-run output proving fix.diff applies cleanly on with-src"
    },
    {
      "path": "../fix_build_combined.log",
      "type": "build-log",
      "desc": "Combined 41-finding kernel build (rc=0, -Werror clean)"
    },
    {
      "path": "../fix_build_summary.txt",
      "type": "build-summary",
      "desc": "Summary of the combined 41-finding kernel build"
    }
  ]
}