From c4a1d573cce887dba6a3c65d86efd5662b1cec1c Mon Sep 17 00:00:00 2001
From: Arthur Hanson Rasmusson <arthur@vgpu.io>
Date: Sun, 25 Oct 2026 12:05:14 -0400
Subject: wall2 session 91: vkCreateInstance wall BREACHED - the event-slot
 pending-marker (u16@+0xe=0xffff) cleared at each +0xB33D30 retry entry passes
 the instance phase for the first time; client then persists in
 vkCreateDevice's nvidia0 poll waiting for the event-fd signal (guest dispatch
 gap); tools t93/t94/t96b/t97

---
 tools/guest-diag/wall2/t96b.py | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 tools/guest-diag/wall2/t96b.py

(limited to 'tools/guest-diag/wall2/t96b.py')

diff --git a/tools/guest-diag/wall2/t96b.py b/tools/guest-diag/wall2/t96b.py
new file mode 100644
index 0000000..cd3b7ab
--- /dev/null
+++ b/tools/guest-diag/wall2/t96b.py
@@ -0,0 +1,40 @@
+import gdb
+gr = gdb.execute
+inf = gdb.selected_inferior()
+pid = inf.pid
+base = None
+for line in open("/proc/%d/maps" % pid):
+    parts = line.split()
+    try:
+        lo, hi = [int(x,16) for x in parts[0].split('-')]
+    except Exception:
+        continue
+    if base is None and "libnvidia-eglcore" in line and int(parts[2],16) == 0:
+        base = lo
+print("BASE 0x%x" % (base or 0))
+class B(gdb.Breakpoint):
+    def __init__(self):
+        super().__init__("*0x%x" % (base + 0xA12DDF), internal=False)
+        self.silent = True; self.done = False
+    def stop(self):
+        if self.done:
+            return True
+        self.done = True
+        try:
+            rdi = int(gdb.parse_and_eval("$rdi"))
+            rsi = int(gdb.parse_and_eval("$rsi"))
+            rdx = int(gdb.parse_and_eval("$rdx"))
+            print("POLL nfds=%d timeout=%d arr=0x%x" % (rsi, rdx, rdi))
+            fd = int(gdb.parse_and_eval("*(int*)0x%x" % rdi))
+            ev = int(gdb.parse_and_eval("*(unsigned short*)0x%x" % (rdi + 4)))
+            rv = int(gdb.parse_and_eval("*(unsigned short*)0x%x" % (rdi + 6)))
+            print("FDPOLL fd=%d events=0x%x revents=0x%x" % (fd, ev, rv))
+        except Exception as e:
+            print("fail %s" % e)
+        return True
+try:
+    B(); print("BP-SET")
+    gr("continue")
+except Exception as e:
+    print("bpfail %s" % e)
+print("T96-DONE")
-- 
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