diff --git a/test/unit/test_viz.py b/test/unit/test_viz.py
index 22d426fb60..e51f85b1fa 100644
--- a/test/unit/test_viz.py
+++ b/test/unit/test_viz.py
@@ -436,6 +436,12 @@ class TestVizProfiler(BaseTestViz):
     sz = len(get_profile(prof))
     self.assertLessEqual(sz/n_events, 26)
 
+  def test_calltrace(self):
+    def fxn(): return Tensor.empty(10).mul(2).realize()
+    fxn()
+    trace = get_viz_list()[0]["steps"][0]["trace"]
+    assert any(fxn.__code__.co_filename == f and fxn.__code__.co_firstlineno == l for f,l,*_ in trace), str(trace)
+
   # can pack up to 1hr 11 min of trace events
   def test_trace_duration(self):
     dur_mins = 72
diff --git a/tinygrad/helpers.py b/tinygrad/helpers.py
index 65f649739d..ba3d451655 100644
--- a/tinygrad/helpers.py
+++ b/tinygrad/helpers.py
@@ -240,11 +240,29 @@ class Profiling(contextlib.ContextDecorator):
 
 def perf_counter_us() -> decimal.Decimal: return decimal.Decimal(time.perf_counter_ns())/1000
 
+@functools.cache
+def lines(fn) -> list[str]:
+  try:
+    with open(fn, encoding="utf-8") as f: return f.readlines()
+  except (FileNotFoundError, OSError): return []
+
+def printable(loc:tuple[str, int]) -> str:
+  try: return lines(loc[0])[loc[1]-1].strip()
+  except IndexError: return "<missing>"
+
+def get_stacktrace(frm, max_frames=30) -> tuple[tuple, ...]:
+  ret:list[tuple] = []
+  for i in range(max_frames):
+    if (frm:=frm.f_back) is None: break
+    ret.append(((fc:=frm.f_code).co_filename, frm.f_lineno, fc.co_name, printable((fc.co_filename, frm.f_lineno))))
+  return tuple(ret)
+
 @dataclass(frozen=True)
 class TracingKey:
   display_name:str                       # display name of this trace event
   keys:tuple[Any, ...]=()                # optional keys to search for related traces
   ret:Any=None
+  tb:tuple[tuple, ...]|None=field(default_factory=lambda: get_stacktrace(sys._getframe(1)) if VIZ else None)
 
 class ProfileEvent: pass
 
diff --git a/tinygrad/uop/ops.py b/tinygrad/uop/ops.py
index ef4e4cce7e..322e8b5f9b 100644
--- a/tinygrad/uop/ops.py
+++ b/tinygrad/uop/ops.py
@@ -8,7 +8,7 @@ from tinygrad.mixin import OpMixin
 from tinygrad.dtype import ConstType, ImageDType, dtypes, DType, truncate, PtrDType, least_upper_dtype, Invalid, InvalidType, AddrSpace
 from tinygrad.helpers import ContextVar, all_int, prod, getenv, all_same, Context, partition, temp, unwrap, T, argfix, Metadata, flatten, TRACEMETA
 from tinygrad.helpers import PICKLE_BUFFERS, PROFILE, dedup, cdiv, cmod, diskcache_put, to_function_name, cpu_profile, TracingKey, VIZ, SPEC, CI
-from tinygrad.helpers import strip_parens, colored, ansilen
+from tinygrad.helpers import strip_parens, colored, ansilen, printable
 if TYPE_CHECKING:
   from tinygrad.device import Buffer, MultiBuffer
 
@@ -865,14 +865,6 @@ def get_location() -> tuple[str, int]:
     frm = frm.f_back
   return frm.f_code.co_filename, frm.f_lineno
 
-@functools.cache
-def lines(fn) -> list[str]:
-  with open(fn) as f: return f.readlines()
-
-def printable(loc:tuple[str, int]) -> str:
-  try: return lines(loc[0])[loc[1]-1].strip()
-  except FileNotFoundError: return "<missing>"
-
 class UPat(OpMixin):
   __slots__ = ("op", "dtype", "arg", "name", "src")
   def __init__(self, op:Ops|tuple[Ops, ...]|set[Ops]|None=None, dtype:DType|tuple[DType, ...]|None=None,
diff --git a/tinygrad/viz/js/index.js b/tinygrad/viz/js/index.js
index b989260cea..415aaa742e 100644
--- a/tinygrad/viz/js/index.js
+++ b/tinygrad/viz/js/index.js
@@ -551,6 +551,7 @@ document.getElementById("zoom-to-fit-btn").addEventListener("click", () => {
 
 // **** main VIZ interfacae
 
+const pathLink = (fp, lineno) => d3.create("a").attr("href", "vscode://file/"+fp+":"+lineno).text(`${fp.split("/").at(-1)}:${lineno}`);
 function codeBlock(st, language, { loc, wrap }={}) {
   const code = document.createElement("code");
   // plaintext renders like a terminal print, otherwise render with syntax highlighting
@@ -559,11 +560,7 @@ function codeBlock(st, language, { loc, wrap }={}) {
   code.className = "hljs";
   const ret = document.createElement("pre");
   if (wrap) ret.className = "wrap";
-  if (loc != null) {
-    const link = ret.appendChild(document.createElement("a"));
-    link.href = "vscode://file/"+loc.join(":");
-    link.textContent = `${loc[0].split("/").at(-1)}:${loc[1]}`+"\n\n";
-  }
+  if (loc != null) ret.appendChild(pathLink(loc[0], loc[1]).style("margin-bottom", "4px").node());
   ret.appendChild(code);
   return ret;
 }
@@ -763,6 +760,15 @@ async function main() {
   // ** right sidebar code blocks
   const codeElement = codeBlock(ret[currentRewrite].uop, "python", { wrap:false });
   metadata.replaceChildren(toggleLabel, codeBlock(step.code_line, "python", { loc:step.loc, wrap:true }), codeElement);
+  if (step.trace) {
+    const trace = d3.create("pre").append("code").classed("hljs", true);
+    for (let i=step.trace.length-1; i>=0; i--) {
+      const [fp, lineno, fn, code] = step.trace[i];
+      trace.append("div").style("margin-bottom", "2px").style("display","flex").text(fn+" ").append(() => pathLink(fp, lineno).node());
+      trace.append("div").html(hljs.highlight(code, { language: "python" }).value).style("margin-bottom", "1ex");
+    }
+    metadata.insertBefore(trace.node().parentNode, codeElement);
+  }
   // ** rewrite steps
   if (step.match_count >= 1) {
     const rewriteList = metadata.appendChild(document.createElement("div"));
diff --git a/tinygrad/viz/serve.py b/tinygrad/viz/serve.py
index 1a19ec4fcd..952928699f 100755
--- a/tinygrad/viz/serve.py
+++ b/tinygrad/viz/serve.py
@@ -7,7 +7,8 @@ from http.server import BaseHTTPRequestHandler
 from urllib.parse import parse_qs, urlparse
 from typing import Any, TypedDict, TypeVar, Generator, Callable
 from tinygrad.helpers import colored, getenv, tqdm, unwrap, word_wrap, TRACEMETA, ProfileEvent, ProfileRangeEvent, TracingKey, ProfilePointEvent, temp
-from tinygrad.uop.ops import TrackedGraphRewrite, RewriteTrace, UOp, Ops, printable, GroupOp, srender, sint, sym_infer, range_str, pyrender
+from tinygrad.helpers import printable
+from tinygrad.uop.ops import TrackedGraphRewrite, RewriteTrace, UOp, Ops, GroupOp, srender, sint, sym_infer, range_str, pyrender
 from tinygrad.uop.ops import print_uops, range_start, multirange_str
 from tinygrad.device import ProfileDeviceEvent, ProfileGraphEvent, ProfileGraphEntry, Device
 from tinygrad.renderer import ProgramSpec
@@ -30,7 +31,7 @@ ref_map:dict[Any, int] = {}
 def get_rewrites(t:RewriteTrace) -> list[dict]:
   ret = []
   for i,(k,v) in enumerate(zip(t.keys, t.rewrites)):
-    steps = [{"name":s.name, "loc":s.loc, "match_count":len(s.matches), "code_line":printable(s.loc),
+    steps = [{"name":s.name, "loc":s.loc, "match_count":len(s.matches), "code_line":printable(s.loc), "trace":k.tb if j == 0 else None,
               "query":f"/ctxs?ctx={i}&idx={j}", "depth":s.depth} for j,s in enumerate(v)]
     if isinstance(k.ret, ProgramSpec):
       steps.append({"name":"View UOp List", "query":f"/render?ctx={i}&fmt=uops", "depth":0})