[Issue]: Cannot register Static Global Var on inline variable

[tpadioleau]

Problem Description

If I call hipMemcpyToSymbol/hipMemcpyFromSymbol on the same inline and __constant__ variable from different source files I get the error Cannot register Static Global Var, error:13.

Find attached inline-variable.zip a small reproducer. It can be compiled and executed with the following commands.

cmake -DCMAKE_CXX_COMPILER=hipcc -DCMAKE_CXX_STANDARD=17 -DGPU_TARGETS=gfx90a -B build
cmake --build build
./build/inline-variable

I only have an easy access to rocm 6.0.0, I could not try the latest rocm 6.1.0 version.

Operating System

Red Hat Enterprise Linux version 8.8

CPU

AMD EPYC 9654 96-Core

GPU

AMD Instinct MI250X

ROCm Version

ROCm 6.0.0

ROCm Component

HIP, HIPCC, rdc

Steps to Reproduce

No response

(Optional for Linux users) Output of /opt/rocm/bin/rocminfo --support

ROCk module is loaded

HSA System Attributes

Runtime Version: 1.1
System Timestamp Freq.: 1000.000000MHz
Sig. Max Wait Duration: 18446744073709551615 (0xFFFFFFFFFFFFFFFF) (timestamp count)
Machine Model: LARGE
System Endianness: LITTLE
Mwaitx: DISABLED
DMAbuf Support: YES

==========
HSA Agents

---

Agent 1

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Marketing Name: AMD EPYC 7A53 64-Core Processor
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Pool 2
Segment: GLOBAL; FLAGS: KERNARG, FINE GRAINED
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Allocatable: TRUE
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Alloc Alignment: 4KB
Accessible by all: TRUE
Pool 3
Segment: GLOBAL; FLAGS: COARSE GRAINED
Size: 65577568(0x3e8a260) KB
Allocatable: TRUE
Alloc Granule: 4KB
Alloc Alignment: 4KB
Accessible by all: TRUE
ISA Info:

---

Agent 2

---

Name: AMD EPYC 7A53 64-Core Processor
Uuid: CPU-XX
Marketing Name: AMD EPYC 7A53 64-Core Processor
Vendor Name: CPU
Feature: None specified
Profile: FULL_PROFILE
Float Round Mode: NEAR
Max Queue Number: 0(0x0)
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Queue Type: MULTI
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Max Clock Freq. (MHz): 3541
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Allocatable: TRUE
Alloc Granule: 4KB
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Accessible by all: TRUE
Pool 2
Segment: GLOBAL; FLAGS: KERNARG, FINE GRAINED
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Allocatable: TRUE
Alloc Granule: 4KB
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Accessible by all: TRUE
Pool 3
Segment: GLOBAL; FLAGS: COARSE GRAINED
Size: 66050988(0x3efdbac) KB
Allocatable: TRUE
Alloc Granule: 4KB
Alloc Alignment: 4KB
Accessible by all: TRUE
ISA Info:

---

Agent 3

---

Name: AMD EPYC 7A53 64-Core Processor
Uuid: CPU-XX
Marketing Name: AMD EPYC 7A53 64-Core Processor
Vendor Name: CPU
Feature: None specified
Profile: FULL_PROFILE
Float Round Mode: NEAR
Max Queue Number: 0(0x0)
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Device Type: CPU
Cache Info:
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ASIC Revision: 0(0x0)
Cacheline Size: 64(0x40)
Max Clock Freq. (MHz): 3541
BDFID: 0
Internal Node ID: 2
Compute Unit: 32
SIMDs per CU: 0
Shader Engines: 0
Shader Arrs. per Eng.: 0
WatchPts on Addr. Ranges:1
Features: None
Pool Info:
Pool 1
Segment: GLOBAL; FLAGS: FINE GRAINED
Size: 66050988(0x3efdbac) KB
Allocatable: TRUE
Alloc Granule: 4KB
Alloc Alignment: 4KB
Accessible by all: TRUE
Pool 2
Segment: GLOBAL; FLAGS: KERNARG, FINE GRAINED
Size: 66050988(0x3efdbac) KB
Allocatable: TRUE
Alloc Granule: 4KB
Alloc Alignment: 4KB
Accessible by all: TRUE
Pool 3
Segment: GLOBAL; FLAGS: COARSE GRAINED
Size: 66050988(0x3efdbac) KB
Allocatable: TRUE
Alloc Granule: 4KB
Alloc Alignment: 4KB
Accessible by all: TRUE
ISA Info:

---

Agent 4

---

Name: AMD EPYC 7A53 64-Core Processor
Uuid: CPU-XX
Marketing Name: AMD EPYC 7A53 64-Core Processor
Vendor Name: CPU
Feature: None specified
Profile: FULL_PROFILE
Float Round Mode: NEAR
Max Queue Number: 0(0x0)
Queue Min Size: 0(0x0)
Queue Max Size: 0(0x0)
Queue Type: MULTI
Node: 3
Device Type: CPU
Cache Info:
L1: 32768(0x8000) KB
Chip ID: 0(0x0)
ASIC Revision: 0(0x0)
Cacheline Size: 64(0x40)
Max Clock Freq. (MHz): 3541
BDFID: 0
Internal Node ID: 3
Compute Unit: 32
SIMDs per CU: 0
Shader Engines: 0
Shader Arrs. per Eng.: 0
WatchPts on Addr. Ranges:1
Features: None
Pool Info:
Pool 1
Segment: GLOBAL; FLAGS: FINE GRAINED
Size: 64940256(0x3dee8e0) KB
Allocatable: TRUE
Alloc Granule: 4KB
Alloc Alignment: 4KB
Accessible by all: TRUE
Pool 2
Segment: GLOBAL; FLAGS: KERNARG, FINE GRAINED
Size: 64940256(0x3dee8e0) KB
Allocatable: TRUE
Alloc Granule: 4KB
Alloc Alignment: 4KB
Accessible by all: TRUE
Pool 3
Segment: GLOBAL; FLAGS: COARSE GRAINED
Size: 64940256(0x3dee8e0) KB
Allocatable: TRUE
Alloc Granule: 4KB
Alloc Alignment: 4KB
Accessible by all: TRUE
ISA Info:

---

Agent 5

---

Name: gfx90a
Uuid: GPU-aeefa4db4734109e
Marketing Name: AMD Instinct MI250X
Vendor Name: AMD
Feature: KERNEL_DISPATCH
Profile: BASE_PROFILE
Float Round Mode: NEAR
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Queue Type: MULTI
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Device Type: GPU
Cache Info:
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L2: 8192(0x2000) KB
Chip ID: 29704(0x7408)
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Cacheline Size: 64(0x40)
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Grid Max Size: 4294967295(0xffffffff)
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z 4294967295(0xffffffff)
Max fbarriers/Workgrp: 32
Packet Processor uCode:: 78
SDMA engine uCode:: 8
IOMMU Support:: None
Pool Info:
Pool 1
Segment: GLOBAL; FLAGS: COARSE GRAINED
Size: 67092480(0x3ffc000) KB
Allocatable: TRUE
Alloc Granule: 4KB
Alloc Alignment: 4KB
Accessible by all: FALSE
Pool 2
Segment: GLOBAL; FLAGS:
Size: 67092480(0x3ffc000) KB
Allocatable: TRUE
Alloc Granule: 4KB
Alloc Alignment: 4KB
Accessible by all: FALSE
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Segment: GLOBAL; FLAGS: FINE GRAINED
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ISA Info:
ISA 1
Name: amdgcn-amd-amdhsa--gfx90a:sramecc+:xnack-
Machine Models: HSA_MACHINE_MODEL_LARGE
Profiles: HSA_PROFILE_BASE
Default Rounding Mode: NEAR
Default Rounding Mode: NEAR
Fast f16: TRUE
Workgroup Max Size: 1024(0x400)
Workgroup Max Size per Dimension:
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y 1024(0x400)
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Grid Max Size: 4294967295(0xffffffff)
Grid Max Size per Dimension:
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y 4294967295(0xffffffff)
z 4294967295(0xffffffff)
FBarrier Max Size: 32
*** Done ***

Additional Information

No response

[yxsamliu]

At first I thought it was clang issue, but further investigation showed that clang generated correct code.

The issue seems to be a HIP runtime bug caused by https://github.com/ROCm/clr/blob/feaef7f54eb2d517b00a63f157780a84c7ecda31/hipamd/src/hip_code_object.cpp#L874

Basically, runtime expects each shadow variable to be only registered once, otherwise it returns hipErrorInvalidSymbol.

However, this is not true when different translation units defines an inline variable with the same name. These variables are merged by linker as one variable and they have the same address. Therefore runtime could encounter registering the same shadow variable multiple times. As long as they map to the same device variable name, it should be allowed.

[tpadioleau]

Thank you very much for the quick investigation!

Basically, runtime expects each shadow variable to be only registered once, otherwise it returns hipErrorInvalidSymbol.

To understand correctly, there is a call to this registerStatGlobalVar function in each translation unit right ?

Can you tell what HIP versions will get the fix ?

[yxsamliu]

Thank you very much for the quick investigation!

Basically, runtime expects each shadow variable to be only registered once, otherwise it returns hipErrorInvalidSymbol.

To understand correctly, there is a call to this registerStatGlobalVar function in each translation unit right ?

In each translation unit, registerStatGlobalVar is called for each device variable defined by that translation unit.

Can you tell what HIP versions will get the fix ?

I will leave your question for HIP runtime team. @mangupta

[kjayapra-amd]

Fix is in review (#460091). Will update here once I know the landing version.

[tpadioleau]

Has the fix been accepted ? If so, what versions have this fix ?

[tpadioleau]

Any update ?

[schung-amd]

Hi @tpadioleau, sorry for the delayed response. This fix isn't in a release yet as far as I can tell, but I can keep tabs on this and update you once the fix lands in a future release. Your reproducer zip file seems to be broken; can you reupload it so I can verify?

[tpadioleau]

@schung-amd Thanks for the update, what do you mean by broken ? You could download it but not open it ? On my side it seems to work fine.

[schung-amd]

Never mind, I was passing the wrong options to tar, the file is fine. Can confirm that this is not fixed as of ROCm 6.2.2, I'll update you when the fix lands in a release.