wall2 session 93: zero-ptrace pipeline (t101 instance clears self-disabling + unwait.py 16K/+0x80 word poller) reaches VKDEVICE on r693 with 5 auto-written words and no wedge risk; RM-lock wedge root-caused (gdb killed at a stop inside an RM critical section) with new attach rules + t102 safe diagnostic

1 files changed, 48 insertions, 0 deletions

diff --git a/tools/guest-diag/wall2/unwait.py b/tools/guest-diag/wall2/unwait.py
new file mode 100644
index 0000000..94e677c
--- /dev/null
+++ b/tools/guest-diag/wall2/unwait.py
@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+# unwait.py - guest-side, zero-ptrace wait-word poller: writes 1 to the +0x80
+# u32 of every zero 16 KB rw-s nvidiactl mapping of the newest vk_frame.
+import os, re, subprocess, sys, time
+DUR = float(sys.argv[1]) if len(sys.argv) > 1 else 600
+def newest_pid():
+    try:
+        out = subprocess.run(["pgrep", "-n", "-x", "vk_frame"], capture_output=True).stdout
+        return int(out.decode().strip())
+    except Exception:
+        return None
+def maps(pid):
+    try:
+        return open("/proc/%d/maps" % pid).read()
+    except Exception:
+        return ""
+logged = set()
+end = time.time() + DUR
+while time.time() < end:
+    pid = newest_pid()
+    if pid:
+        for line in maps(pid).splitlines():
+            p = line.split()
+            if len(p) < 6 or "nvidia" not in p[-1] or "rw-s" not in p[1]:
+                continue
+            try:
+                lo, hi = [int(x, 16) for x in p[0].split("-")]
+            except Exception:
+                continue
+            if hi - lo != 0x4000:
+                continue
+            wa = lo + 0x80
+            try:
+                fd = os.open("/proc/%d/mem" % pid, os.O_RDWR)
+                os.lseek(fd, wa, 0)
+                v = os.read(fd, 4)
+                if len(v) == 4 and v == b"\x00\x00\x00\x00":
+                    os.lseek(fd, wa, 0)
+                    os.write(fd, b"\x01\x00\x00\x00")
+                    key = (pid, wa)
+                    if key not in logged:
+                        logged.add(key)
+                        print("WORDWROTE pid=%d va=0x%x" % (pid, wa), flush=True)
+                os.close(fd)
+            except Exception:
+                pass
+    time.sleep(0.4)
+print("UNWAIT-DONE", flush=True)