[flang][OpenMP] test_parallel_for_allocate.F90: free(): invalid next size (normal)

The OpenMP V&V test [`test_parallel_for_allocate.F90`](https://github.com/OpenMP-Validation-and-Verification/OpenMP_VV/blob/master/tests/5.0/parallel_for/test_parallel_for_allocate.F90) is failing with:

```console
$ /home/meinersbur/install/llvm/bin/flang --version
flang version 23.0.0git (https://github.com/ROCm/llvm-project a30a8e9474f75000d9746b5d02800d2e47903f44)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/meinersbur/install/llvm/bin
Build config: +assertions
Configuration file: /home/meinersbur/install/llvm/bin/flang.cf
$ /home/meinersbur/install/llvm/bin/flang -I./ompvv -O2 -fopenmp --offload-arch=gfx90a -fopenmp-version=50 -DVERBOSE_MODE=1
$ LD_LIBRARY_PATH=/home/meinersbur/install/llvm/lib /home/meinersbur/src/OpenMP_VV/tests/5.0/parallel_for/test_parallel_for_allocate.F90 -o bin/test_parallel_for_allocate.F90
warning: OpenMP support for version 50 in flang is still incomplete
warning: OpenMP support for version 50 in flang is still incomplete
warning: OpenMP support for version 50 in flang is still incomplete
[header test_parallel_for_allocate.F90:26] Test is running on device
free(): invalid next size (normal)
free(): invalid next size (normal)
free(): invalid next size (normal)
free(): invalid next size (normal)
Aborted (core dumped)
```

I bisected this to a30a8e9474f75000d9746b5d02800d2e47903f44 (#183794, #188851). Its parent d5f7acdbc15fd15244bf6f3e4d4e3ea5a7bd2781 is working as expected.

LIBOMPTARGET_DEBUG=1 output

omptarget --> Init offload library!

OMPT --> Entering connectLibrary

OMPT --> OMPT: Trying to load library libomp.so

OMPT --> OMPT: Trying to get address of connection routine ompt_libomp_connect

OMPT --> OMPT: Library connection handle = 0x0000741ffb755210

OMPT --> Exiting connectLibrary

omptarget --> Loading RTLs

omptarget --> RTLs loaded!

TARGET AMDGPU RTL --> Implementing hsa_init with dlsym(hsa_init) -> 0x741ff098edf0

TARGET AMDGPU RTL --> Implementing hsa_status_string with dlsym(hsa_status_string) -> 0x741ff098f5c0

TARGET AMDGPU RTL --> Implementing hsa_shut_down with dlsym(hsa_shut_down) -> 0x741ff098ee10

TARGET AMDGPU RTL --> Implementing hsa_system_get_info with dlsym(hsa_system_get_info) -> 0x741ff098ee20

TARGET AMDGPU RTL --> Implementing hsa_agent_get_info with dlsym(hsa_agent_get_info) -> 0x741ff098ee90

TARGET AMDGPU RTL --> Implementing hsa_isa_get_info_alt with dlsym(hsa_isa_get_info_alt) -> 0x741ff098f380

TARGET AMDGPU RTL --> Implementing hsa_iterate_agents with dlsym(hsa_iterate_agents) -> 0x741ff098ee80

TARGET AMDGPU RTL --> Implementing hsa_agent_iterate_isas with dlsym(hsa_agent_iterate_isas) -> 0x741ff098f360

TARGET AMDGPU RTL --> Implementing hsa_signal_create with dlsym(hsa_signal_create) -> 0x741ff098f0b0

TARGET AMDGPU RTL --> Implementing hsa_signal_destroy with dlsym(hsa_signal_destroy) -> 0x741ff098f0c0

TARGET AMDGPU RTL --> Implementing hsa_signal_store_relaxed with dlsym(hsa_signal_store_relaxed) -> 0x741ff098f0f0

TARGET AMDGPU RTL --> Implementing hsa_signal_store_screlease with dlsym(hsa_signal_store_screlease) -> 0x741ff098f100

TARGET AMDGPU RTL --> Implementing hsa_signal_wait_scacquire with dlsym(hsa_signal_wait_scacquire) -> 0x741ff098f140

TARGET AMDGPU RTL --> Implementing hsa_signal_load_scacquire with dlsym(hsa_signal_load_scacquire) -> 0x741ff098f0e0

TARGET AMDGPU RTL --> Implementing hsa_signal_subtract_screlease with dlsym(hsa_signal_subtract_screlease) -> 0x741ff098f2b0

TARGET AMDGPU RTL --> Implementing hsa_queue_create with dlsym(hsa_queue_create) -> 0x741ff098eef0

TARGET AMDGPU RTL --> Implementing hsa_queue_destroy with dlsym(hsa_queue_destroy) -> 0x741ff098ef10

TARGET AMDGPU RTL --> Implementing hsa_queue_load_read_index_scacquire with dlsym(hsa_queue_load_read_index_scacquire) -> 0x741ff098ef30

TARGET AMDGPU RTL --> Implementing hsa_queue_add_write_index_relaxed with dlsym(hsa_queue_add_write_index_relaxed) -> 0x741ff098eff0

TARGET AMDGPU RTL --> Implementing hsa_memory_copy with dlsym(hsa_memory_copy) -> 0x741ff098f090

TARGET AMDGPU RTL --> Implementing hsa_executable_create with dlsym(hsa_executable_create) -> 0x741ff098f490

TARGET AMDGPU RTL --> Implementing hsa_executable_create_alt with dlsym(hsa_executable_create_alt) -> 0x741ff098f4a0

TARGET AMDGPU RTL --> Implementing hsa_executable_destroy with dlsym(hsa_executable_destroy) -> 0x741ff098f4b0

TARGET AMDGPU RTL --> Implementing hsa_executable_freeze with dlsym(hsa_executable_freeze) -> 0x741ff098f4f0

TARGET AMDGPU RTL --> Implementing hsa_executable_validate with dlsym(hsa_executable_validate) -> 0x741ff098f540

TARGET AMDGPU RTL --> Implementing hsa_executable_symbol_get_info with dlsym(hsa_executable_symbol_get_info) -> 0x741ff098f580

TARGET AMDGPU RTL --> Implementing hsa_executable_get_symbol_by_name with dlsym(hsa_executable_get_symbol_by_name) -> 0x741ff098f570

TARGET AMDGPU RTL --> Implementing hsa_executable_iterate_symbols with dlsym(hsa_executable_iterate_symbols) -> 0x741ff098f590

TARGET AMDGPU RTL --> Implementing hsa_code_object_deserialize with dlsym(hsa_code_object_deserialize) -> 0x741ff098f3f0

TARGET AMDGPU RTL --> Implementing hsa_executable_load_code_object with dlsym(hsa_executable_load_code_object) -> 0x741ff098f4c0

TARGET AMDGPU RTL --> Implementing hsa_code_object_destroy with dlsym(hsa_code_object_destroy) -> 0x741ff098f400

TARGET AMDGPU RTL --> Implementing hsa_amd_agent_memory_pool_get_info with dlsym(hsa_amd_agent_memory_pool_get_info) -> 0x741ff098f730

TARGET AMDGPU RTL --> Implementing hsa_amd_agent_iterate_memory_pools with dlsym(hsa_amd_agent_iterate_memory_pools) -> 0x741ff098f6b0

TARGET AMDGPU RTL --> Implementing hsa_amd_memory_pool_allocate with dlsym(hsa_amd_memory_pool_allocate) -> 0x741ff098f6c0

TARGET AMDGPU RTL --> Implementing hsa_amd_memory_pool_free with dlsym(hsa_amd_memory_pool_free) -> 0x741ff098f6d0

TARGET AMDGPU RTL --> Implementing hsa_amd_memory_async_copy with dlsym(hsa_amd_memory_async_copy) -> 0x741ff098f6e0

TARGET AMDGPU RTL --> Implementing hsa_amd_memory_pool_get_info with dlsym(hsa_amd_memory_pool_get_info) -> 0x741ff098f6a0

TARGET AMDGPU RTL --> Implementing hsa_amd_agents_allow_access with dlsym(hsa_amd_agents_allow_access) -> 0x741ff098f740

TARGET AMDGPU RTL --> Implementing hsa_amd_memory_lock with dlsym(hsa_amd_memory_lock) -> 0x741ff098f770

TARGET AMDGPU RTL --> Implementing hsa_amd_memory_unlock with dlsym(hsa_amd_memory_unlock) -> 0x741ff098f790

TARGET AMDGPU RTL --> Implementing hsa_amd_memory_fill with dlsym(hsa_amd_memory_fill) -> 0x741ff098f7a0

TARGET AMDGPU RTL --> Implementing hsa_amd_register_system_event_handler with dlsym(hsa_amd_register_system_event_handler) -> 0x741ff098f860

TARGET AMDGPU RTL --> Implementing hsa_amd_signal_create with dlsym(hsa_amd_signal_create) -> 0x741ff098f830

TARGET AMDGPU RTL --> Implementing hsa_amd_signal_async_handler with dlsym(hsa_amd_signal_async_handler) -> 0x741ff098f640

TARGET AMDGPU RTL --> Implementing hsa_amd_pointer_info with dlsym(hsa_amd_pointer_info) -> 0x741ff098f7e0

TARGET AMDGPU RTL --> Implementing hsa_code_object_reader_create_from_memory with dlsym(hsa_code_object_reader_create_from_memory) -> 0x741ff098f470

TARGET AMDGPU RTL --> Implementing hsa_code_object_reader_destroy with dlsym(hsa_code_object_reader_destroy) -> 0x741ff098f480

TARGET AMDGPU RTL --> Implementing hsa_executable_load_agent_code_object with dlsym(hsa_executable_load_agent_code_object) -> 0x741ff098f4e0

omptarget --> Registered plugin AMDGPU with 1 visible device(s)

omptarget --> Image 0x0000000000200388 is compatible with RTL AMDGPU device 0

omptarget --> Registering image 0x0000000000200388 with RTL AMDGPU

omptarget --> Done registering entries!

omptarget --> Entering target region for device -1 with entry point 0x000000000020a420

omptarget --> Default TARGET OFFLOAD policy is now mandatory (devices were found)

omptarget --> Use default device id 0

omptarget --> Call to omp_get_num_devices returning 1

omptarget --> Call to omp_get_num_devices returning 1

omptarget --> Call to omp_get_initial_device returning 1

omptarget --> Entry 0: Base=0x0000000000312fb0, Begin=0x0000000000312fb0, Size=4, Type=0x22, Name=loc(fused<#fir>["/home/mickruse/git/aomp-test/OpenMP_VV/ompvv/ompvv.F90":122:25, "/work/mickruse/git/aomp-test/OpenMP_VV/tests/5.0/parallel_for/test_parallel_for_allocate.F90":16:1])

omptarget --> Entry 1: Base=0x0000000000000000, Begin=0x0000000000000000, Size=0, Type=0x120, Name=unknown

omptarget --> Trans table 0x0000000000203d10 : 0x0000000000203db8

PluginInterface --> Load data from image 0x200388

omptarget --> Call to omp_get_num_devices returning 1

omptarget --> Call to omp_get_initial_device returning 1

PluginInterface --> MemoryManagerTy::allocate: size 48 with host pointer 0x0.

PluginInterface --> findBucket: Size 48 is floored to 32.

PluginInterface --> Cannot find a node in the FreeLists. Allocate on device.

PluginInterface --> Node address 0x24e8a920, target pointer 0x741ff2c3a000, size 48

PluginInterface --> MemoryManagerTy::free: target memory 0x741ff2c3a000.

PluginInterface --> findBucket: Size 48 is floored to 32.

PluginInterface --> Found its node 0x24e8a920. Insert it to bucket 4.

omptarget --> Entry point 0x0000000000313514 maps to global _QMompvv_libEompvv_errors (0x0000741ff2c40168)

PluginInterface --> Global symbol '__omp_offloading_fc00_64c3235__QMompvv_libPtest_offloading_probe_l144_kernel_environment' was found in the ELF image and 48 bytes will copied from 0x24e86cc0 to 0x24e7c7a0.

TARGET AMDGPU RTL --> ELFABIVersion: 4

omptarget --> Entry point 0x000000000020a420 maps to __omp_offloading_fc00_64c3235__QMompvv_libPtest_offloading_probe_l144 (0x0000000024e7c760)

PluginInterface --> Global symbol '__omp_offloading_fc00_64c3235__QMompvv_libPtest_shared_environment_probe_l312_kernel_environment' was found in the ELF image and 48 bytes will copied from 0x24e86cf0 to 0x24e7c890.

TARGET AMDGPU RTL --> ELFABIVersion: 4

omptarget --> Entry point 0x000000000020a450 maps to __omp_offloading_fc00_64c3235__QMompvv_libPtest_shared_environment_probe_l312 (0x0000000024e7c850)

omptarget --> Looking up mapping(HstPtrBegin=0x0000000000313514, Size=4)...

omptarget --> Add mapping from host 0x0000000000313514 to device 0x0000741ff2c40168 with size 4, name "_QMompvv_libEompvv_errors"

omptarget --> Notifying about new mapping: HstPtr=0x0000000000313514, Size=4

omptarget --> loop trip count is 0

omptarget --> Looking up mapping(HstPtrBegin=0x0000000000312fb0, Size=4)...

PluginInterface --> MemoryManagerTy::allocate: size 4 with host pointer 0x312fb0.

PluginInterface --> findBucket: Size 4 is floored to 4.

PluginInterface --> findBucket: Size 4 goes to bucket 0

PluginInterface --> Cannot find a node in the FreeLists. Allocate on device.

PluginInterface --> Node address 0x24e8bd90, target pointer 0x741fec400000, size 4

omptarget --> Creating new map entry with HstPtrBase=0x0000000000312fb0, HstPtrBegin=0x0000000000312fb0, TgtAllocBegin=0x0000741fec400000, TgtPtrBegin=0x0000741fec400000, Size=4, DynRefCount=1, HoldRefCount=0, Name=loc(fused<#fir>["/home/mickruse/git/aomp-test/OpenMP_VV/ompvv/ompvv.F90":122:25, "/work/mickruse/git/aomp-test/OpenMP_VV/tests/5.0/parallel_for/test_parallel_for_allocate.F90":16:1])

omptarget --> Notifying about new mapping: HstPtr=0x0000000000312fb0, Size=4

omptarget --> There are 4 bytes allocated at target address 0x0000741fec400000 - is new

omptarget --> Looking up mapping(HstPtrBegin=0x0000000000312fb0, Size=4)...

omptarget --> Mapping exists with HstPtrBegin=0x0000000000312fb0, TgtPtrBegin=0x0000741fec400000, Size=4, DynRefCount=1 (update suppressed), HoldRefCount=0

omptarget --> Obtained target argument 0x0000741fec400000 from host pointer 0x0000000000312fb0

omptarget --> Forwarding first-private value 0x0000000000000000 to the target construct

omptarget --> Launching target execution __omp_offloading_fc00_64c3235__QMompvv_libPtest_offloading_probe_l144 with pointer 0x0000000024e7c760 (index=1).

PluginInterface --> Launching kernel __omp_offloading_fc00_64c3235__QMompvv_libPtest_offloading_probe_l144 with [1,1,1] blocks and [256,1,1] threads in Generic-SPMD mode

PluginInterface --> MemoryManagerTy::allocate: size 16 with host pointer 0x0.

PluginInterface --> findBucket: Size 16 is floored to 16.

PluginInterface --> Cannot find a node in the FreeLists. Allocate on device.

PluginInterface --> Node address 0x24e8be00, target pointer 0x741ff261f000, size 16

omptarget --> Looking up mapping(HstPtrBegin=0x0000000000312fb0, Size=4)...

omptarget --> Mapping exists with HstPtrBegin=0x0000000000312fb0, TgtPtrBegin=0x0000741fec400000, Size=4, DynRefCount=0 (decremented, delayed deletion), HoldRefCount=0

omptarget --> There are 4 bytes allocated at target address 0x0000741fec400000 - is last

omptarget --> Tracking released entry: HstPtr=0x0000000000312fb0, Size=4, ForceDelete=0

omptarget --> Moving 4 bytes (tgt:0x0000741fec400000) -> (hst:0x0000000000312fb0)

omptarget --> Call to omp_get_num_devices returning 1

omptarget --> Call to omp_get_initial_device returning 1

PluginInterface --> MemoryManagerTy::allocate: size 4 with host pointer 0x0.

PluginInterface --> findBucket: Size 4 is floored to 4.

PluginInterface --> findBucket: Size 4 goes to bucket 0

PluginInterface --> Cannot find a node in the FreeLists. Allocate on device.

PluginInterface --> Node address 0x24e8bd20, target pointer 0x741ff0819000, size 4

PluginInterface --> MemoryManagerTy::free: target memory 0x741ff261f000.

PluginInterface --> findBucket: Size 16 is floored to 16.

PluginInterface --> Found its node 0x24e8be00. Insert it to bucket 3.

PluginInterface --> MemoryManagerTy::free: target memory 0x741ff0819000.

PluginInterface --> findBucket: Size 4 is floored to 4.

PluginInterface --> findBucket: Size 4 goes to bucket 0

PluginInterface --> Found its node 0x24e8bd20. Insert it to bucket 0.

omptarget --> Removing map entry with HstPtrBegin=0x0000000000312fb0, TgtPtrBegin=0x0000741fec400000, Size=4, Name=loc(fused<#fir>["/home/mickruse/git/aomp-test/OpenMP_VV/ompvv/ompvv.F90":122:25, "/work/mickruse/git/aomp-test/OpenMP_VV/tests/5.0/parallel_for/test_parallel_for_allocate.F90":16:1])

omptarget --> Deleting tgt data 0x0000741fec400000 of size 4 by freeing allocation starting at 0x0000741fec400000

PluginInterface --> MemoryManagerTy::free: target memory 0x741fec400000.

PluginInterface --> findBucket: Size 4 is floored to 4.

PluginInterface --> findBucket: Size 4 goes to bucket 0

PluginInterface --> Found its node 0x24e8bd90. Insert it to bucket 0.

omptarget --> Notifying about an unmapping: HstPtr=0x0000000000312fb0

[header test_parallel_for_allocate.F90:26] Test is running on device

free(): invalid next size (normal)

free(): invalid next size (normal)

free(): invalid next size (normal)

free(): invalid next size (normal)

free(): invalid next size (normal)

free(): invalid next size (normal)

free(): invalid next size (normal)

Aborted (core dumped)

This may indicate some heap smashing

@luporl

Reproduce tests/5.0/parallel_for/test_parallel_for_allocate.F90 with flang, OpenMP 5.0, AMDGPU offload, and the shown runtime settings. Compare commit a30a8e9474f75000d9746b5d02800d2e47903f44 with parent d5f7acdbc15fd15244bf6f3e4d4e3ea5a7bd2781, using the LIBOMPTARGET_DEBUG output to locate the regression. Done means the test no longer reports invalid frees or aborts.

Written by the indexing model from the issue text.