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# gdb script: localize the ucode-image load failure inside FUN_00e21850.
#
# Run #7: in the membar-WAR hook the descriptor lookup FUN_0035a4d0(0x13,7,5)
# SUCCEEDED (non-NULL, remap (7,5)->(7,0)), and FUN_00e21850 returned 1
# (NV_ERR_INVALID_ARGUMENT) -> hook returns 999. FUN_00e21850 is two calls:
# FUN_003e99d0 (blob -> image object) at 0xd218e6, result tested at 0xd218ed
# FUN_003dfae0 (image load) at 0xd21932, result tested at 0xd21937
# Break after each; the first non-zero status names the failing step.
#
# Run: sudo gdb -p <cdt-pid> -batch -x /tmp/bpz8.py
import gdb
import time
out = gdb.execute("info proc mappings", to_string=True)
base = None
for line in out.splitlines():
if "libcuda" in line and "r-xp" in line:
f = line.split()
base = int(f[0], 16) - int(f[3], 16)
break
print("BASE=0x%x" % (base or 0))
if base is None:
raise SystemExit
gdb.execute("set pagination off")
gdb.execute("set confirm off")
SITES = [
(0xd218e6, "IMG_CREATE_CALL"),
(0xd218ed, "IMG_CREATE_RET"),
(0xd21932, "IMG_LOAD_CALL"),
(0xd21937, "IMG_LOAD_RET"),
]
for off, name in SITES:
gdb.execute("break *0x%x" % (base + off))
t0 = time.time()
for hit in range(30):
try:
gdb.execute("continue")
except gdb.error as e:
print("CONTINUE_END %s" % e)
break
rip = int(gdb.parse_and_eval("$rip")) & 0xffffffffffffffff
off = rip - base
name = dict(SITES).get(off, "?")
try:
rax = int(gdb.parse_and_eval("$rax")) & 0xffffffffffffffff
rdx = int(gdb.parse_and_eval("$rdx")) & 0xffffffffffffffff
except Exception:
rax = rdx = 0
print("HIT t=%.3f off=0x%x %s rax=0x%x rdx_off=0x%x" %
(time.time() - t0, off, name, rax, (rdx - base) & 0xffffffffffffffff if rdx else 0))
if off in (0xd218ed, 0xd21937) and (rax & 0xffffffff) != 0:
print(" >>> FAILED STEP %s status=0x%x" % (name, rax & 0xffffffff))
try:
print(gdb.execute("bt 10", to_string=True))
except Exception as e:
print("bt_fail %s" % e)
break
try:
gdb.execute("detach")
except Exception:
pass
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