[Backport branch/3.0.x] Fix uninitialized read in local atomic code path. by github-actions[bot] · Pull Request #4425 · NVIDIA/cccl

github-actions · 2025-04-12T01:05:45Z

Description

Backport of #4352 to branch/3.0.x.

* Fix uninitialized read in local atomic code path. * PTX assumes '=' operands are always overwritten. For this code path the predicated mov instruction will only sometimes overwrite the original value. The compiler may or may not initialize `__temp`. This patch fixes this by always signing a 0 or 1 to the output register removing the need to initialize `__temp`. An alternative is to use `+` instead of `=` on the output operand. * Create a test to cover the PTX path of local storage atomics regardless of CTK version * Disable test for nvrtc * Use new additional compile flags * Try and fix checking for compile flags * Update comments in is_local codepath * Make test compatible with older NVCC * Revert "Try and fix checking for compile flags" This reverts commit a846ea5. * Remove unroll pragma, it is unneeded for repro. --------- Co-authored-by: Michael Schellenberger Costa <miscco@nvidia.com> (cherry picked from commit 3200156)

copy-pr-bot · 2025-04-12T01:05:49Z

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wmaxey · 2025-04-12T01:34:37Z

/ok to test 97bf5ec

github-actions · 2025-04-12T12:43:35Z

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  🟩 GCC12              Pass: 100%/2   | Total: 16m 42s | Avg:  8m 21s | Max: 13m 01s | Hits:  99%/1168  
  🟩 GCC13              Pass: 100%/6   | Total: 31m 02s | Avg:  5m 10s | Max: 14m 18s | Hits:  98%/3504  
  🟩 MSVC14.39          Pass: 100%/1   | Total: 13m 32s | Avg: 13m 32s | Max: 13m 32s | Hits:  70%/281   
  🟩 MSVC14.42          Pass: 100%/1   | Total: 14m 20s | Avg: 14m 20s | Max: 14m 20s | Hits:  70%/281   
  🟩 NVHPC25.1          Pass: 100%/2   | Total: 19m 03s | Avg:  9m 31s | Max:  9m 36s | Hits:  63%/752   
🟩 cxx_family
  🟩 Clang              Pass: 100%/8   | Total: 37m 05s | Avg:  4m 38s | Max: 12m 43s | Hits: 100%/4674  
  🟩 GCC                Pass: 100%/10  | Total: 54m 35s | Avg:  5m 27s | Max: 14m 18s | Hits:  99%/5842  
  🟩 MSVC               Pass: 100%/2   | Total: 27m 52s | Avg: 13m 56s | Max: 14m 20s | Hits:  70%/562   
  🟩 NVHPC              Pass: 100%/2   | Total: 19m 03s | Avg:  9m 31s | Max:  9m 36s | Hits:  63%/752   
🟩 gpu
  🟩 h100               Pass: 100%/2   | Total: 17m 27s | Avg:  8m 43s | Max: 14m 18s | Hits:  99%/1168  
  🟩 rtx2080            Pass: 100%/20  | Total:  2h 01m | Avg:  6m 03s | Max: 14m 20s | Hits:  95%/10662 
🟩 jobs
  🟩 Build              Pass: 100%/19  | Total:  1h 38m | Avg:  5m 11s | Max: 14m 20s | Hits:  95%/10078 
  🟩 Test               Pass: 100%/3   | Total: 40m 02s | Avg: 13m 20s | Max: 14m 18s | Hits:  99%/1752  
🟩 sm
  🟩 90                 Pass: 100%/3   | Total: 21m 17s | Avg:  7m 05s | Max: 14m 18s | Hits:  98%/1752  
  🟩 90a                Pass: 100%/1   | Total:  3m 09s | Avg:  3m 09s | Max:  3m 09s | Hits:  99%/584   
🟩 std
  🟩 17                 Pass: 100%/4   | Total: 20m 10s | Avg:  5m 02s | Max:  9m 36s | Hits:  92%/2128  
  🟩 20                 Pass: 100%/18  | Total:  1h 58m | Avg:  6m 34s | Max: 14m 20s | Hits:  96%/9702

🟩 stdpar: Pass: 100%/4 | Total: 18m 53s | Avg: 4m 43s | Max: 5m 24s

🟩 cpu
  🟩 amd64              Pass: 100%/2   | Total: 10m 21s | Avg:  5m 10s | Max:  5m 24s
  🟩 arm64              Pass: 100%/2   | Total:  8m 32s | Avg:  4m 16s | Max:  4m 23s
🟩 ctk
  🟩 12.6               Pass: 100%/4   | Total: 18m 53s | Avg:  4m 43s | Max:  5m 24s
🟩 cudacxx
  🟩 nvcc12.6           Pass: 100%/4   | Total: 18m 53s | Avg:  4m 43s | Max:  5m 24s
🟩 cudacxx_family
  🟩 nvcc               Pass: 100%/4   | Total: 18m 53s | Avg:  4m 43s | Max:  5m 24s
🟩 cxx
  🟩 NVHPC25.1          Pass: 100%/4   | Total: 18m 53s | Avg:  4m 43s | Max:  5m 24s
🟩 cxx_family
  🟩 NVHPC              Pass: 100%/4   | Total: 18m 53s | Avg:  4m 43s | Max:  5m 24s
🟩 gpu
  🟩 rtx2080            Pass: 100%/4   | Total: 18m 53s | Avg:  4m 43s | Max:  5m 24s
🟩 jobs
  🟩 Build              Pass: 100%/4   | Total: 18m 53s | Avg:  4m 43s | Max:  5m 24s
🟩 std
  🟩 17                 Pass: 100%/2   | Total:  9m 06s | Avg:  4m 33s | Max:  4m 57s
  🟩 20                 Pass: 100%/2   | Total:  9m 47s | Avg:  4m 53s | Max:  5m 24s

🟩 cccl_c_parallel: Pass: 100%/2 | Total: 16m 54s | Avg: 8m 27s | Max: 14m 33s | Hits: 98%/320

🟩 cpu
  🟩 amd64              Pass: 100%/2   | Total: 16m 54s | Avg:  8m 27s | Max: 14m 33s | Hits:  98%/320   
🟩 ctk
  🟩 12.8               Pass: 100%/2   | Total: 16m 54s | Avg:  8m 27s | Max: 14m 33s | Hits:  98%/320   
🟩 cudacxx
  🟩 nvcc12.8           Pass: 100%/2   | Total: 16m 54s | Avg:  8m 27s | Max: 14m 33s | Hits:  98%/320   
🟩 cudacxx_family
  🟩 nvcc               Pass: 100%/2   | Total: 16m 54s | Avg:  8m 27s | Max: 14m 33s | Hits:  98%/320   
🟩 cxx
  🟩 GCC13              Pass: 100%/2   | Total: 16m 54s | Avg:  8m 27s | Max: 14m 33s | Hits:  98%/320   
🟩 cxx_family
  🟩 GCC                Pass: 100%/2   | Total: 16m 54s | Avg:  8m 27s | Max: 14m 33s | Hits:  98%/320   
🟩 gpu
  🟩 rtx2080            Pass: 100%/2   | Total: 16m 54s | Avg:  8m 27s | Max: 14m 33s | Hits:  98%/320   
🟩 jobs
  🟩 Build              Pass: 100%/1   | Total:  2m 21s | Avg:  2m 21s | Max:  2m 21s | Hits:  98%/160   
  🟩 Test               Pass: 100%/1   | Total: 14m 33s | Avg: 14m 33s | Max: 14m 33s | Hits:  98%/160

🟩 python: Pass: 100%/1 | Total: 1h 11m | Avg: 1h 11m | Max: 1h 11m

🟩 cpu
  🟩 amd64              Pass: 100%/1   | Total:  1h 11m | Avg:  1h 11m | Max:  1h 11m
🟩 ctk
  🟩 12.8               Pass: 100%/1   | Total:  1h 11m | Avg:  1h 11m | Max:  1h 11m
🟩 cudacxx
  🟩 nvcc12.8           Pass: 100%/1   | Total:  1h 11m | Avg:  1h 11m | Max:  1h 11m
🟩 cudacxx_family
  🟩 nvcc               Pass: 100%/1   | Total:  1h 11m | Avg:  1h 11m | Max:  1h 11m
🟩 cxx
  🟩 GCC13              Pass: 100%/1   | Total:  1h 11m | Avg:  1h 11m | Max:  1h 11m
🟩 cxx_family
  🟩 GCC                Pass: 100%/1   | Total:  1h 11m | Avg:  1h 11m | Max:  1h 11m
🟩 gpu
  🟩 rtx2080            Pass: 100%/1   | Total:  1h 11m | Avg:  1h 11m | Max:  1h 11m
🟩 jobs
  🟩 Test               Pass: 100%/1   | Total:  1h 11m | Avg:  1h 11m | Max:  1h 11m

👃 Inspect Changes

Modifications in project?

	Project
	CCCL Infrastructure
+/-	libcu++
	CUB
	Thrust
	CUDA Experimental
	stdpar
	python
	CCCL C Parallel Library
	Catch2Helper

Modifications in project or dependencies?

	Project
	CCCL Infrastructure
+/-	libcu++
+/-	CUB
+/-	Thrust
+/-	CUDA Experimental
+/-	stdpar
+/-	python
+/-	CCCL C Parallel Library
+/-	Catch2Helper

🏃‍ Runner counts (total jobs: 162)

#	Runner
113	`linux-amd64-cpu16`
15	`windows-amd64-cpu16`
12	`linux-arm64-cpu16`
8	`linux-amd64-gpu-rtx2080-latest-1`
6	`linux-amd64-gpu-rtxa6000-latest-1`
5	`linux-amd64-gpu-h100-latest-1`
3	`linux-amd64-gpu-rtx4090-latest-1`

github-actions Bot requested a review from a team as a code owner April 12, 2025 01:05

github-actions Bot requested a review from wmaxey April 12, 2025 01:05

github-project-automation Bot moved this to Todo in CCCL Apr 12, 2025

github-project-automation Bot added this to CCCL Apr 12, 2025

github-actions Bot mentioned this pull request Apr 12, 2025

Fix uninitialized read in local atomic code path. #4352

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wmaxey approved these changes Apr 12, 2025

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github-project-automation Bot moved this from Todo to In Review in CCCL Apr 12, 2025

wmaxey enabled auto-merge (squash) April 12, 2025 01:34

wmaxey merged commit 67a0867 into branch/3.0.x Apr 12, 2025
177 checks passed

github-project-automation Bot moved this from In Review to Done in CCCL Apr 12, 2025

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[Backport branch/3.0.x] Fix uninitialized read in local atomic code path.#4425

[Backport branch/3.0.x] Fix uninitialized read in local atomic code path.#4425
wmaxey merged 1 commit intobranch/3.0.xfrom
backport-4352-to-branch/3.0.x

github-actions Bot commented Apr 12, 2025

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copy-pr-bot Bot commented Apr 12, 2025

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wmaxey commented Apr 12, 2025

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github-actions Bot commented Apr 12, 2025

🟩 cub: Pass: 100%/45 | Total: 17h 56m | Avg: 23m 54s | Max: 1h 16m | Hits: 93%/53743

🟩 thrust: Pass: 100%/45 | Total: 11h 03m | Avg: 14m 44s | Max: 54m 10s | Hits: 94%/80181

🟩 libcudacxx: Pass: 100%/43 | Total: 7h 40m | Avg: 10m 42s | Max: 37m 24s | Hits: 86%/106391

🟩 cudax: Pass: 100%/22 | Total: 2h 18m | Avg: 6m 17s | Max: 14m 20s | Hits: 95%/11830

🟩 stdpar: Pass: 100%/4 | Total: 18m 53s | Avg: 4m 43s | Max: 5m 24s

🟩 cccl_c_parallel: Pass: 100%/2 | Total: 16m 54s | Avg: 8m 27s | Max: 14m 33s | Hits: 98%/320

🟩 python: Pass: 100%/1 | Total: 1h 11m | Avg: 1h 11m | Max: 1h 11m

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🏃‍ Runner counts (total jobs: 162)

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github-actions Bot commented Apr 12, 2025

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copy-pr-bot Bot commented Apr 12, 2025

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wmaxey commented Apr 12, 2025

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github-actions Bot commented Apr 12, 2025

🟩 cub: Pass: 100%/45 | Total: 17h 56m | Avg: 23m 54s | Max: 1h 16m | Hits: 93%/53743

🟩 thrust: Pass: 100%/45 | Total: 11h 03m | Avg: 14m 44s | Max: 54m 10s | Hits: 94%/80181

🟩 libcudacxx: Pass: 100%/43 | Total: 7h 40m | Avg: 10m 42s | Max: 37m 24s | Hits: 86%/106391

🟩 cudax: Pass: 100%/22 | Total: 2h 18m | Avg: 6m 17s | Max: 14m 20s | Hits: 95%/11830

🟩 stdpar: Pass: 100%/4 | Total: 18m 53s | Avg: 4m 43s | Max: 5m 24s

🟩 cccl_c_parallel: Pass: 100%/2 | Total: 16m 54s | Avg: 8m 27s | Max: 14m 33s | Hits: 98%/320

🟩 python: Pass: 100%/1 | Total: 1h 11m | Avg: 1h 11m | Max: 1h 11m

👃 Inspect Changes

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🏃‍ Runner counts (total jobs: 162)

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