⬢ DragonFlyBSD Kernel Audit
DF-5540 / manifest.json
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{
  "finding_id": "DF-5540",
  "verdict": "reproduced",
  "impact": "dos",
  "reproduce": {
    "build": "sh build.sh   (cd /usr/src/sys/bus/u4b/serial/ua5540 && make; artifact: uark5540stall.ko, -Werror clean)",
    "run": "sh run.sh     (dmesg -c; kldload /root/df5540/uark5540stall.ko; kldunload uark5540stall; dmesg | grep UA5540)",
    "expected": "closer ELAPSED lines: A=~900 ms (first open: 1-req break-off line task, param bails), A2=~7000 ms (1 tcsetattr = 6x1000 ms + hz/10), A3=~13100 ms (5-burst coalesced to 2 param execs), B=~2000 ms (fix abort), C=~560 ms (fix abort+250ms). Measured: 921/6995/13012/2029/561 ms; re-run 854/6950/12963/2034/564 ms. Every request sleeps its full ~1000 ms (absolute timestamps in run.log)."
  },
  "kernel_refs": [
    "sys/bus/u4b/serial/uark.c:138-148",
    "sys/bus/u4b/serial/uark.c:140",
    "sys/bus/u4b/serial/uark.c:241-243",
    "sys/bus/u4b/serial/uark.c:260-263",
    "sys/bus/u4b/serial/uark.c:290-294",
    "sys/bus/u4b/serial/uark.c:343",
    "sys/bus/u4b/serial/uark.c:348-396",
    "sys/bus/u4b/serial/uark.c:359",
    "sys/bus/u4b/serial/uark.c:361-364",
    "sys/bus/u4b/serial/uark.c:394-395",
    "sys/bus/u4b/serial/uark.c:398-405",
    "sys/bus/u4b/serial/uark.c:407-415",
    "sys/bus/u4b/serial/uark.c:414",
    "sys/bus/u4b/serial/uark.c:417-435",
    "sys/bus/u4b/serial/uark.c:423-427",
    "sys/bus/u4b/serial/uark.c:429-430",
    "sys/bus/u4b/serial/uark.c:431-434",
    "sys/bus/u4b/serial/usb_serial.h:220-221",
    "sys/bus/u4b/serial/usb_serial.c:322",
    "sys/bus/u4b/serial/usb_serial.c:371-372",
    "sys/bus/u4b/serial/usb_serial.c:394",
    "sys/bus/u4b/serial/usb_serial.c:671-672",
    "sys/bus/u4b/serial/usb_serial.c:694-696",
    "sys/bus/u4b/serial/usb_serial.c:757-779",
    "sys/bus/u4b/serial/usb_serial.c:801-903",
    "sys/bus/u4b/serial/usb_serial.c:842",
    "sys/bus/u4b/serial/usb_serial.c:865",
    "sys/bus/u4b/serial/usb_serial.c:874-880",
    "sys/bus/u4b/serial/usb_serial.c:1357-1420",
    "sys/bus/u4b/serial/usb_serial.c:1374-1381",
    "sys/bus/u4b/serial/usb_serial.c:1619-1637",
    "sys/bus/u4b/serial/usb_serial.c:1626-1628",
    "sys/bus/u4b/serial/usb_serial.c:1636",
    "sys/bus/u4b/serial/usb_serial.c:1691-1693",
    "sys/bus/u4b/usb_request.c:561",
    "sys/bus/u4b/usb_request.c:643",
    "sys/bus/u4b/usb_request.c:700-704",
    "sys/bus/u4b/usb_request.c:759-790",
    "sys/bus/u4b/usb_process.c:259-331",
    "sys/bus/u4b/usb_process.c:364-393"
  ],
  "artifacts": [
    "uark5540stall_harness.c",
    "Makefile",
    "build.sh",
    "run.sh",
    "build.log",
    "run.log",
    "run.2.log",
    "fix_compile.log",
    "env.txt",
    "fix.diff",
    "README.md",
    "VERDICT.md",
    "manifest.json",
    "verdict.json"
  ]
}