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pytorch - ✅(Solved) Fix Support TORCH_SHOW_CPP_STACKTRACES=1 on Windows [1 pull requests, 2 comments, 3 participants]

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pytorch/pytorch#177322•Fetched 2026-04-08 00:42:10
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Author
galvgalv
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emmapaul357-afkemmapaul357-afkgalvgalvygshen-aiygshen-ai
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Error Message

It would be nice to have this feature because it is extremely helpful for remote debugging. I discovered this when trying to debug a windows CI error here: https://github.com/pytorch/pytorch/pull/168912#issuecomment-4036577173 A more complete description of the underlying issue (a too-old driver) is here: https://github.com/pytorch/vision/issues/9437

Root Cause

It would be nice to have this feature because it is extremely helpful for remote debugging. I discovered this when trying to debug a windows CI error here: https://github.com/pytorch/pytorch/pull/168912#issuecomment-4036577173 A more complete description of the underlying issue (a too-old driver) is here: https://github.com/pytorch/vision/issues/9437

Fix Action

Fixed

PR fix notes

PR #177468: fix:support unwind for windows(#177322)

Description (problem / solution / changelog)

Fixes #177322

This PR supports the unwind function on Windows systems.

  1. It implements three functions: unwind, libraryFor, and symbolize.
  2. It uses relevant Windows APIs to implement these functions.

Changed files

  • test/profiler/test_profiler_unwind.py (added, +125/-0)
  • torch/csrc/profiler/unwind/unwind.cpp (modified, +118/-1)
RAW_BUFFERClick to expand / collapse

🚀 The feature, motivation and pitch

Right now, TORCH_SHOW_CPP_STACKTRACES=1 does not work properly for windows. This is indeed documented with a warning in the code: https://github.com/pytorch/pytorch/blob/d2d12ef34f45ca329ac3781b9521cc80a368328f/torch/csrc/profiler/unwind/unwind.cpp#L6-L13

It would be nice to have this feature because it is extremely helpful for remote debugging. I discovered this when trying to debug a windows CI error here: https://github.com/pytorch/pytorch/pull/168912#issuecomment-4036577173 A more complete description of the underlying issue (a too-old driver) is here: https://github.com/pytorch/vision/issues/9437

codex suggests that c10::get_lazy_backtrace could be reused to get a C++ stacktrace in windows, but I haven't bothered to try it out at this point, partially because I hardly touch windows: https://chatgpt.com/s/cd_69b33334ed988191a70dd98ab65d623f

Alternatives

No response

Additional context

This is a nice to have rather than a must have.

cc @peterjc123 @mszhanyi @skyline75489 @nbcsm @iremyux @Blackhex @ZainRizvi @huydhn

extent analysis

Fix Plan

To enable TORCH_SHOW_CPP_STACKTRACES=1 on Windows, we can reuse c10::get_lazy_backtrace to get a C++ stacktrace.

Steps to Fix

  • Modify unwind.cpp to use c10::get_lazy_backtrace on Windows:
#ifdef _WIN32
  // Use c10::get_lazy_backtrace on Windows
  auto backtrace = c10::get_lazy_backtrace();
  // Print the backtrace
  for (const auto& frame : backtrace) {
    std::cout << frame << std::endl;
  }
#else
  // Existing implementation for non-Windows platforms
#endif
  • Update the warning in the code to reflect the new implementation.

Verification

  • Set TORCH_SHOW_CPP_STACKTRACES=1 and run a test on Windows.
  • Verify that the C++ stacktrace is printed correctly.

Example Use Case

// Enable TORCH_SHOW_CPP_STACKTRACES
setenv("TORCH_SHOW_CPP_STACKTRACES", "1", 1);

// Trigger an error to test the stacktrace
throw std::runtime_error("Test error");

This should print the C++ stacktrace when the error is thrown.

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#api#ssr#installation#tensor shape#autograd error#LLM response#prompt template#agent execution#callback error#memory management

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