[BUG] NVRTC compilation error 6 with `wp.map` in debug mode

[liblaf]

Bug Description

When using wp.map, the code fails with a NVRTC_ERROR_COMPILATION (error 6) if wp.config.mode is set to "debug". The error messages indicate an "invalid line number".

The same code runs correctly when wp.config.mode is set to "release".

To Reproduce:

import warp as wp

wp.config.mode = "debug"
a = wp.array([1, 2, 3], dtype=wp.float32)
b = wp.array([4, 5, 6], dtype=wp.float32)
c = wp.array([7, 8, 9], dtype=wp.float32)
result = wp.map(lambda x, y, z: x + 2.0 * y - z, a, b, c)
print(result)

Error Log (click to expand)

Warp 1.9.0 initialized:
   CUDA Toolkit 12.8, Driver 13.0
   Devices:
     "cpu"      : "CPU"
     "cuda:0"   : "NVIDIA GeForce GTX 1080 Ti" (11 GiB, sm_61, mempool enabled)
   Kernel cache:
     /home/liblaf/.cache/warp/1.9.0
Warp NVRTC compilation error 6: NVRTC_ERROR_COMPILATION (/builds/omniverse/warp/warp/native/warp.cu:3622)
nvrtc: warning: Architectures prior to '<compute/sm>_75' are deprecated and may be removed in a future release
wp_map_func_d8cae767_c21cf51.cu(27): error: invalid line number
  #line 0 "/home/liblaf/github/liblaf/apple/playground/hello.py"
        ^

/home/liblaf/github/liblaf/apple/playground/hello.py(2): error: invalid line number
  #line 0 "/home/liblaf/github/liblaf/apple/playground/hello.py"
        ^

/home/liblaf/github/liblaf/apple/playground/hello.py(7): error: invalid line number
  #line 0 "/home/liblaf/github/liblaf/apple/playground/hello.py"
        ^

/home/liblaf/github/liblaf/apple/playground/hello.py(5): error: invalid line number
  #line 0 "/home/liblaf/github/liblaf/apple/playground/hello.py"
        ^

/home/liblaf/github/liblaf/apple/playground/hello.py(1): warning #550-D: variable "var_3" was set but never used
      wp::float32 var_3;
                  ^

Remark: The warnings can be suppressed with "-diag-suppress <warning-number>"

/home/liblaf/github/liblaf/apple/playground/hello.py(10): error: invalid line number
  #line 0 "unknown source file"
        ^

/home/liblaf/github/liblaf/apple/playground/hello.py(18): error: invalid line number
  #line 0 "unknown source file"
        ^

/home/liblaf/github/liblaf/apple/playground/hello.py(20): error: invalid line number
  #line 0 "unknown source file"
        ^

/home/liblaf/github/liblaf/apple/playground/hello.py(22): error: invalid line number
  #line 0 "unknown source file"
        ^

/home/liblaf/github/liblaf/apple/playground/hello.py(26): error: invalid line number
  #line 0 "unknown source file"
        ^

unknown source file(6): error: invalid line number
  #line 0 "unknown source file"
        ^

unknown source file(8): error: invalid line number
  #line 0 "unknown source file"
        ^

unknown source file(13): error: invalid line number
  #line 0 "unknown source file"
        ^

unknown source file(25): error: invalid line number
  #line 0 "unknown source file"
        ^

unknown source file(27): error: invalid line number
  #line 0 "unknown source file"
        ^

unknown source file(29): error: invalid line number
  #line 0 "unknown source file"
        ^

unknown source file(33): error: invalid line number
  #line 0 "unknown source file"
        ^

unknown source file(7): error: invalid line number
  #line 0 "unknown source file"
        ^

unknown source file(9): error: invalid line number
  #line 0 "unknown source file"
        ^

18 errors detected in the compilation of "wp_map_func_d8cae767_c21cf51.cu".
Module map_func_d8cae767 c21cf51 load on device 'cuda:0' took 189.08 ms  (error)
Traceback (most recent call last):
  File "/home/liblaf/github/liblaf/apple/playground/hello.py", line 7, in <module>
    result = wp.map(lambda x, y, z: x + 2.0 * y - z, a, b, c)
  File "/home/liblaf/github/liblaf/apple/.venv/lib/python3.13/site-packages/warp/utils.py", line 1058, in map
    wp.launch(
    ~~~~~~~~~^
        kernel,
        ^^^^^^^
    ...<4 lines>...
        device=device,
        ^^^^^^^^^^^^^^
    )
    ^
  File "/home/liblaf/github/liblaf/apple/.venv/lib/python3.13/site-packages/warp/context.py", line 6169, in launch
    module_exec = kernel.module.load(device, block_dim)
  File "/home/liblaf/github/liblaf/apple/.venv/lib/python3.13/site-packages/warp/context.py", line 2601, in load
    raise (e)
  File "/home/liblaf/github/liblaf/apple/.venv/lib/python3.13/site-packages/warp/context.py", line 2598, in load
    self.compile(device, module_dir, output_name, output_arch)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/liblaf/github/liblaf/apple/.venv/lib/python3.13/site-packages/warp/context.py", line 2466, in compile
    raise (e)
  File "/home/liblaf/github/liblaf/apple/.venv/lib/python3.13/site-packages/warp/context.py", line 2445, in compile
    warp.build.build_cuda(
    ~~~~~~~~~~~~~~~~~~~~~^
        source_code_path,
        ^^^^^^^^^^^^^^^^^
    ...<9 lines>...
        fatbins=builder.fatbins.values(),
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/home/liblaf/github/liblaf/apple/.venv/lib/python3.13/site-packages/warp/build.py", line 91, in build_cuda
    raise Exception(f"CUDA kernel build failed with error code {err}")
Exception: CUDA kernel build failed with error code 6

System Information

• Warp: 1.9.0
• Python: 3.13.7
• OS: linux-64

[shi-eric]

Thanks for reporting this! We will have a fix for this in v1.9.1. In the meantime you should be able to work around it by disabling line directives: wp.config.line_directives = False.

[shi-eric]

e8056ec is the commit that should address this issue

[liblaf]

Fix confirmed in the latest nightly build v1.10.0.dev20250917.