Loading a PyTorch Model in C++ error in execution

Hi,
I am trying the loadind a Pytorch Model in C++ tutorial : https://brsoff.github.io/tutorials/advanced/cpp_export.html
I do not have any problem from the step 1 to the step 3, but when I am trying to execute the script module in C++ (step 4) I have a free() pointer error :

*** Error in `./example-app’: free(): invalid pointer: 0x00007ffc1b6ab040 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x81609)[0x7f9691e44609]
./example-app(_ZN9__gnu_cxx13new_allocatorIPNSt8__detail15_Hash_node_baseEE10deallocateEPS3_m+0x20)[0x442eda]
./example-app(_ZNSt10_HashtableIN3c106SymbolES1_SaIS1_ENSt8__detail9_IdentityESt8equal_toIS1_ESt4hashIS1_ENS3_18_Mod_range_hashingENS3_20_Default_ranged_hashENS3_20_Prime_rehash_policyENS3_17_Hashtable_traitsILb1ELb1ELb1EEEE21_M_deallocate_bucketsEPPNS3_15_Hash_node_baseEm+0x49)[0x44096d]
./example-app(_ZNSt10_HashtableIN3c106SymbolES1_SaIS1_ENSt8__detail9_IdentityESt8equal_toIS1_ESt4hashIS1_ENS3_18_Mod_range_hashingENS3_20_Default_ranged_hashENS3_20_Prime_rehash_policyENS3_17_Hashtable_traitsILb1ELb1ELb1EEEED1Ev+0x36)[0x43d4fe]
/home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libcaffe2.so(+0x83d5c8)[0x7f9708bfe5c8]
/home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libcaffe2.so(_ZN5torch3jit6script16SchemaTypeParser9parseTypeEv+0xc13)[0x7f9708c3c733]
/home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libcaffe2.so(+0x865d75)[0x7f9708c26d75]
/home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libcaffe2.so(+0x8688c6)[0x7f9708c298c6]
/home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libcaffe2.so(+0x864723)[0x7f9708c25723]
/home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libcaffe2.so(_ZN5torch3jit17parseSchemaOrNameERKSs+0x6f7)[0x7f9708c28cf7]
/home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libcaffe2.so(_ZN5torch3jit11parseSchemaERKSs+0x23)[0x7f9708c29623]
/home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libtorch.so.1(+0xaab25b)[0x7f9717db825b]
/home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libtorch.so.1(_ZN5torch3jit16registerOperatorEONS0_8OperatorE+0x15)[0x7f9717dc4cd5]
/home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libtorch.so.1(+0x27c350)[0x7f9717589350]
/lib64/ld-linux-x86-64.so.2(+0xf8f3)[0x7f97189be8f3]
/lib64/ld-linux-x86-64.so.2(+0x115a)[0x7f97189b015a]
======= Memory map: ========
00400000-0045b000 r-xp 00000000 fd:02 23416494 /home/pixur/Documents/Zaynab/TestLibtorch/cpp/build/example-app
0065b000-0065c000 r–p 0005b000 fd:02 23416494 /home/pixur/Documents/Zaynab/TestLibtorch/cpp/build/example-app
0065c000-0065d000 rw-p 0005c000 fd:02 23416494 /home/pixur/Documents/Zaynab/TestLibtorch/cpp/build/example-app
01a66000-022a8000 rw-p 00000000 00:00 0 [heap]
7f9688000000-7f9688021000 rw-p 00000000 00:00 0
7f9688021000-7f968c000000 —p 00000000 00:00 0
7f968f50b000-7f968f520000 r-xp 00000000 fd:00 33618302 /usr/lib64/libz.so.1.2.7
7f968f520000-7f968f71f000 —p 00015000 fd:00 33618302 /usr/lib64/libz.so.1.2.7
7f968f71f000-7f968f720000 r–p 00014000 fd:00 33618302 /usr/lib64/libz.so.1.2.7
7f968f720000-7f968f721000 rw-p 00015000 fd:00 33618302 /usr/lib64/libz.so.1.2.7
7f968f721000-7f968f778000 r-xp 00000000 fd:00 37466332 /usr/local/lib64/libopencv_flann.so.4.1.1
7f968f778000-7f968f977000 —p 00057000 fd:00 37466332 /usr/local/lib64/libopencv_flann.so.4.1.1
7f968f977000-7f968f97a000 r–p 00056000 fd:00 37466332 /usr/local/lib64/libopencv_flann.so.4.1.1
7f968f97a000-7f968f97b000 rw-p 00059000 fd:00 37466332 /usr/local/lib64/libopencv_flann.so.4.1.1
7f968f97b000-7f968fa47000 r-xp 00000000 fd:00 37466363 /usr/local/lib64/libopencv_features2d.so.4.1.1
7f968fa47000-7f968fc46000 —p 000cc000 fd:00 37466363 /usr/local/lib64/libopencv_features2d.so.4.1.1
7f968fc46000-7f968fc4c000 r–p 000cb000 fd:00 37466363 /usr/local/lib64/libopencv_features2d.so.4.1.1
7f968fc4c000-7f968fc4e000 rw-p 000d1000 fd:00 37466363 /usr/local/lib64/libopencv_features2d.so.4.1.1
7f968fc4e000-7f968fc4f000 rw-p 00000000 00:00 0
7f968fc4f000-7f968fe03000 r-xp 00000000 fd:00 37466379 /usr/local/lib64/libopencv_calib3d.so.4.1.1
7f968fe03000-7f9690003000 —p 001b4000 fd:00 37466379 /usr/local/lib64/libopencv_calib3d.so.4.1.1
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7f9690008000-7f9690009000 rw-p 00000000 00:00 0
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7f9690524000-7f969058e000 rw-p 00000000 00:00 0
7f969058e000-7f9690aec000 r-xp 00000000 fd:00 37466336 /usr/local/lib64/libopencv_imgproc.so.4.1.1
7f9690aec000-7f9690cec000 —p 0055e000 fd:00 37466336 /usr/local/lib64/libopencv_imgproc.so.4.1.1
7f9690cec000-7f9690d0b000 r–p 0055e000 fd:00 37466336 /usr/local/lib64/libopencv_imgproc.so.4.1.1
7f9690d0b000-7f9690d14000 rw-p 0057d000 fd:00 37466336 /usr/local/lib64/libopencv_imgproc.so.4.1.1
7f9690d14000-7f9690db6000 rw-p 00000000 00:00 0
7f9690db6000-7f9690dfd000 r-xp 00000000 fd:00 33559109 /usr/lib64/libnvidia-fatbinaryloader.so.418.67
7f9690dfd000-7f9690ffd000 —p 00047000 fd:00 33559109 /usr/lib64/libnvidia-fatbinaryloader.so.418.67
7f9690ffd000-7f9690fff000 rw-p 00047000 fd:00 33559109 /usr/lib64/libnvidia-fatbinaryloader.so.418.67
7f9690fff000-7f9691004000 rw-p 00000000 00:00 0
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7f9691006000-7f9691206000 —p 00002000 fd:00 33558188 /usr/lib64/libdl-2.17.so
7f9691206000-7f9691207000 r–p 00002000 fd:00 33558188 /usr/lib64/libdl-2.17.so
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7f9691208000-7f9691309000 r-xp 00000000 fd:00 33558190 /usr/lib64/libm-2.17.so
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7f969150a000-7f9691511000 r-xp 00000000 fd:00 33558255 /usr/lib64/librt-2.17.so
7f9691511000-7f9691710000 —p 00007000 fd:00 33558255 /usr/lib64/librt-2.17.so
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7f9691b98000-7f9691b99000 rw-p 0000a000 fd:02 1613308896 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libnvToolsExt-3965bdd0.so.1
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7f9712be3000-7f9712be6000 rw-p 00000000 00:00 0
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7f9714138000-7f971413d000 rw-p 00000000 00:00 0
7f971413d000-7f9714158000 r-xp 00000000 fd:02 1613308385 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libc10_cuda.so
7f9714158000-7f9714357000 —p 0001b000 fd:02 1613308385 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libc10_cuda.so
7f9714357000-7f9714358000 r–p 0001a000 fd:02 1613308385 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libc10_cuda.so
7f9714358000-7f9714359000 rw-p 0001b000 fd:02 1613308385 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libc10_cuda.so
7f9714359000-7f971435d000 rw-p 00000000 00:00 0
7f971435d000-7f9714363000 rw-p 00024000 fd:02 1613308385 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libc10_cuda.so
7f9714363000-7f97143da000 r-xp 00000000 fd:00 100734668 /usr/local/cuda-10.1/targets/x86_64-linux/lib/libcudart.so.10.1.168
7f97143da000-7f97145da000 —p 00077000 fd:00 100734668 /usr/local/cuda-10.1/targets/x86_64-linux/lib/libcudart.so.10.1.168
7f97145da000-7f97145de000 rw-p 00077000 fd:00 100734668 /usr/local/cuda-10.1/targets/x86_64-linux/lib/libcudart.so.10.1.168
7f97145de000-7f97145df000 rw-p 00000000 00:00 0
7f97145df000-7f97145e7000 r-xp 00000000 fd:00 106168878 /usr/local/cuda-10.1/targets/x86_64-linux/lib/libnvToolsExt.so.1.0.0
7f97145e7000-7f97147e7000 —p 00008000 fd:00 106168878 /usr/local/cuda-10.1/targets/x86_64-linux/lib/libnvToolsExt.so.1.0.0
7f97147e7000-7f97147e8000 rw-p 00008000 fd:00 106168878 /usr/local/cuda-10.1/targets/x86_64-linux/lib/libnvToolsExt.so.1.0.0
7f97147e8000-7f97159e6000 r-xp 00000000 fd:00 101504711 /usr/local/cuda-10.1/targets/x86_64-linux/lib/libnvrtc.so.10.1.168
7f97159e6000-7f9715be5000 —p 011fe000 fd:00 101504711 /usr/local/cuda-10.1/targets/x86_64-linux/lib/libnvrtc.so.10.1.168
7f9715be5000-7f9715e68000 r–p 011fd000 fd:00 101504711 /usr/local/cuda-10.1/targets/x86_64-linux/lib/libnvrtc.so.10.1.168
7f9715e68000-7f9715eaf000 rw-p 01480000 fd:00 101504711 /usr/local/cuda-10.1/targets/x86_64-linux/lib/libnvrtc.so.10.1.168
7f9715eaf000-7f9715f56000 rw-p 00000000 00:00 0
7f9715f56000-7f9716d42000 r-xp 00000000 fd:00 33559094 /usr/lib64/libcuda.so.418.67
7f9716d42000-7f9716f41000 —p 00dec000 fd:00 33559094 /usr/lib64/libcuda.so.418.67
7f9716f41000-7f97170bb000 rw-p 00deb000 fd:00 33559094 /usr/lib64/libcuda.so.418.67
7f97170bb000-7f97170cb000 rw-p 00000000 00:00 0
7f97170cb000-7f9717103000 r-xp 00000000 fd:02 1613308378 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libc10.so
7f9717103000-7f9717303000 —p 00038000 fd:02 1613308378 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libc10.so
7f9717303000-7f9717304000 r–p 00038000 fd:02 1613308378 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libc10.so
7f9717304000-7f9717305000 rw-p 00039000 fd:02 1613308378 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libc10.so
7f9717305000-7f9717306000 rw-p 00000000 00:00 0
7f9717306000-7f971730d000 rw-p 0004d000 fd:02 1613308378 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libc10.so
7f971730d000-7f9718384000 r-xp 00000000 fd:02 1613308383 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libtorch.so.1
7f9718384000-7f9718584000 —p 01077000 fd:02 1613308383 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libtorch.so.1
7f9718584000-7f97185c3000 r–p 01077000 fd:02 1613308383 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libtorch.so.1
7f97185c3000-7f97185ca000 rw-p 010b6000 fd:02 1613308383 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libtorch.so.1
7f97185ca000-7f97185cd000 rw-p 00000000 00:00 0
7f97185cd000-7f97189af000 rw-p 013fd000 fd:02 1613308383 /home/pixur/Documents/Zaynab/TestLibtorch/libtorch/lib/libtorch.so.1
7f97189af000-7f97189d1000 r-xp 00000000 fd:00 33556048 /usr/lib64/ld-2.17.so
7f9718b7d000-7f9718bb5000 rw-p 00000000 00:00 0
7f9718bcd000-7f9718bd0000 rw-p 00000000 00:00 0
7f9718bd0000-7f9718bd1000 r–p 00021000 fd:00 33556048 /usr/lib64/ld-2.17.so
7f9718bd1000-7f9718bd2000 rw-p 00022000 fd:00 33556048 /usr/lib64/ld-2.17.so
7f9718bd2000-7f9718bd3000 rw-p 00000000 00:00 0
7ffc1b69e000-7ffc1b6bf000 rw-p 00000000 00:00 0 [stack]
7ffc1b776000-7ffc1b778000 r-xp 00000000 00:00 0 [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]
Abandon (core dumped)

my environment :
centos7
Python 3.7.3
Torch 1. 0.0
Cuda 10.1

Did anyone face the same problem? I will appreciate a little help :slight_smile:

When using Centos 7, be sure to not use a too old C++ compiler, you need gcc >= 4.9.something. 4.8.x will not do.

Best regars

Thomas

1 Like

Yes using gcc 4.9 resolve the problem.
Thank you