<p dir="auto">On Ubuntu 16.04, Python 3.6.2 and PyTorch 0.2.0, it's possible to force a <code class="notranslate">free() on invalid pointer</code> segfault by first doing <code class="notranslate">import zmq</code> then <code class="notranslate">import torch</code>.<br>
<em>(Originally, I had this problem when trying to import pytorch into a Jupyter notebook, then proceeded to narrow the problem down to just importing zmq in a plain python3 interpreter).</em></p>
<p dir="auto">For reproducability, I've created a gist containing a Dockerfile and script:<br>
<a href="https://gist.github.com/rh314/bef5152b655286a8138edd7666789807">https://gist.github.com/rh314/bef5152b655286a8138edd7666789807</a><br>
(I managed to reproduce the crash with the above scripts)</p>
<p dir="auto">The crash typically looks as follows:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="*** Error in `python3': free(): invalid pointer: 0x00007f98524c1b80 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f986429c7e5]
/lib/x86_64-linux-gnu/libc.so.6(+0x8037a)[0x7f98642a537a]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f98642a953c]
/usr/local/lib/python3.6/site-packages/torch/lib/libshm.so(_ZNSt6locale5_Impl16_M_install_facetEPKNS_2idEPKNS_5facetE+0x142)[0x7f985225b802]
/usr/local/lib/python3.6/site-packages/torch/lib/libshm.so(_ZNSt6locale5_ImplC2Em+0x1e3)[0x7f985225d953]
/usr/local/lib/python3.6/site-packages/torch/lib/libshm.so(_ZNSt6locale18_S_initialize_onceEv+0x15)[0x7f985225e8c5]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xea99)[0x7f98645fda99]
/usr/local/lib/python3.6/site-packages/torch/lib/libshm.so(_ZNSt6locale13_S_initializeEv+0x21)[0x7f985225e911]
/usr/local/lib/python3.6/site-packages/torch/lib/libshm.so(_ZNSt6localeC1Ev+0x13)[0x7f985225e953]
/usr/local/lib/python3.6/site-packages/torch/lib/libshm.so(_ZNSt8ios_base4InitC1Ev+0xb4)[0x7f98522301b4]
/usr/local/lib/python3.6/site-packages/torch/lib/libcusparse-652fe42d.so.7.5.18(+0x2a5a14)[0x7f982ee0ba14]
/usr/local/lib/python3.6/site-packages/torch/lib/libcusparse-652fe42d.so.7.5.18(+0x2a6aa3)[0x7f982ee0caa3]
/usr/local/lib/python3.6/site-packages/torch/lib/libcusparse-652fe42d.so.7.5.18(+0x335026)[0x7f982ee9b026]"><pre class="notranslate"><code class="notranslate">*** Error in `python3': free(): invalid pointer: 0x00007f98524c1b80 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f986429c7e5]
/lib/x86_64-linux-gnu/libc.so.6(+0x8037a)[0x7f98642a537a]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f98642a953c]
/usr/local/lib/python3.6/site-packages/torch/lib/libshm.so(_ZNSt6locale5_Impl16_M_install_facetEPKNS_2idEPKNS_5facetE+0x142)[0x7f985225b802]
/usr/local/lib/python3.6/site-packages/torch/lib/libshm.so(_ZNSt6locale5_ImplC2Em+0x1e3)[0x7f985225d953]
/usr/local/lib/python3.6/site-packages/torch/lib/libshm.so(_ZNSt6locale18_S_initialize_onceEv+0x15)[0x7f985225e8c5]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xea99)[0x7f98645fda99]
/usr/local/lib/python3.6/site-packages/torch/lib/libshm.so(_ZNSt6locale13_S_initializeEv+0x21)[0x7f985225e911]
/usr/local/lib/python3.6/site-packages/torch/lib/libshm.so(_ZNSt6localeC1Ev+0x13)[0x7f985225e953]
/usr/local/lib/python3.6/site-packages/torch/lib/libshm.so(_ZNSt8ios_base4InitC1Ev+0xb4)[0x7f98522301b4]
/usr/local/lib/python3.6/site-packages/torch/lib/libcusparse-652fe42d.so.7.5.18(+0x2a5a14)[0x7f982ee0ba14]
/usr/local/lib/python3.6/site-packages/torch/lib/libcusparse-652fe42d.so.7.5.18(+0x2a6aa3)[0x7f982ee0caa3]
/usr/local/lib/python3.6/site-packages/torch/lib/libcusparse-652fe42d.so.7.5.18(+0x335026)[0x7f982ee9b026]
</code></pre></div>
<p dir="auto">The following code snippet crashes python3:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="# Error torch is not defined etc. Can insert any code snippet that tries to reference torch.
torch.zeros(5) 
# Python3 crashes
import torch "><pre class="notranslate"><code class="notranslate"># Error torch is not defined etc. Can insert any code snippet that tries to reference torch.
torch.zeros(5) 
# Python3 crashes
import torch 
</code></pre></div>
<p dir="auto">The error I get is the following:</p>
<blockquote>
<p dir="auto">*** Error in `python3': free(): invalid pointer: 0x00007faba101fb80 ***</p>
</blockquote>
<p dir="auto">I've tested it on multiple computer and get the same result. This is not the case for any other packages I've tried.</p>
<p dir="auto">Edit: This is the full error message:</p>
<blockquote>
<p dir="auto">*** Error in `python3': free(): invalid pointer: 0x00007fc39a4cfb80 ***<br>
======= Backtrace: =========<br>
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7fc3b518a7e5]<br>
/lib/x86_64-linux-gnu/libc.so.6(+0x8037a)[0x7fc3b519337a]<br>
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7fc3b519753c]<br>
/usr/local/lib/python3.5/dist-packages/torch/lib/libshm.so(_ZNSt6locale5_Impl16_M_install_facetEPKNS_2idEPKNS_5facetE+0x142)[0x7fc39a269802]<br>
/usr/local/lib/python3.5/dist-packages/torch/lib/libshm.so(_ZNSt6locale5_ImplC2Em+0x1e3)[0x7fc39a26b953]<br>
/usr/local/lib/python3.5/dist-packages/torch/lib/libshm.so(_ZNSt6locale18_S_initialize_onceEv+0x15)[0x7fc39a26c8c5]<br>
/lib/x86_64-linux-gnu/libpthread.so.0(+0xea99)[0x7fc3b54eba99]<br>
/usr/local/lib/python3.5/dist-packages/torch/lib/libshm.so(_ZNSt6locale13_S_initializeEv+0x21)[0x7fc39a26c911]<br>
/usr/local/lib/python3.5/dist-packages/torch/lib/libshm.so(_ZNSt6localeC1Ev+0x13)[0x7fc39a26c953]<br>
/usr/local/lib/python3.5/dist-packages/torch/lib/libshm.so(_ZNSt8ios_base4InitC1Ev+0xb4)[0x7fc39a23e1b4]<br>
/usr/local/lib/python3.5/dist-packages/torch/lib/libcusparse-94011b8d.so.8.0.61(+0x2f85b4)[0x7fc36a7265b4]<br>
/usr/local/lib/python3.5/dist-packages/torch/lib/libcusparse-94011b8d.so.8.0.61(+0x2f8703)[0x7fc36a726703]<br>
/usr/local/lib/python3.5/dist-packages/torch/lib/libcusparse-94011b8d.so.8.0.61(+0x393cc6)[0x7fc36a7c1cc6]<br>
======= Memory map: ========<br>
00400000-007a8000 r-xp 00000000 fd:00 55837916                           /usr/bin/python3.5<br>
<a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/pytorch/pytorch/commit/009a80004d710332c61144f81c916da0e2b672c6/hovercard" href="https://github.com/pytorch/pytorch/commit/009a80004d710332c61144f81c916da0e2b672c6"><tt>009a800</tt></a>-009aa000 r--p 003a8000 fd:00 55837916                           /usr/bin/python3.5<br>
009aa000-00a41000 rw-p 003aa000 fd:00 55837916                           /usr/bin/python3.5<br>
00a41000-00a72000 rw-p 00000000 00:00 0<br>
023d3000-02aba000 rw-p 00000000 00:00 0                                  [heap]<br>
7fc364000000-7fc364021000 rw-p 00000000 00:00 0<br>
7fc364021000-7fc368000000 ---p 00000000 00:00 0<br>
7fc36a42e000-7fc36cd1f000 r-xp 00000000 fd:00 59902941                   /usr/local/lib/python3.5/dist-packages/torch/lib/libcusparse-94011b8d.so.8.0.61<br>
7fc36cd1f000-7fc36cf1f000 ---p 028f1000 fd:00 59902941                   /usr/local/lib/python3.5/dist-packages/torch/lib/libcusparse-94011b8d.so.8.0.61<br>
7fc36cf1f000-7fc36cf38000 rw-p 028f1000 fd:00 59902941                   /usr/local/lib/python3.5/dist-packages/torch/lib/libcusparse-94011b8d.so.8.0.61<br>
7fc36cf38000-7fc36cf49000 rw-p 00000000 00:00 0<br>
7fc36cf49000-7fc36cf4e000 rw-p 0290b000 fd:00 59902941                   /usr/local/lib/python3.5/dist-packages/torch/lib/libcusparse-94011b8d.so.8.0.61<br>
7fc36cf4e000-7fc36f3e9000 r-xp 00000000 fd:00 59902956                   /usr/local/lib/python3.5/dist-packages/torch/lib/libcurand-3d68c345.so.8.0.61<br>
7fc36f3e9000-7fc36f5e9000 ---p 0249b000 fd:00 59902956                   /usr/local/lib/python3.5/dist-packages/torch/lib/libcurand-3d68c345.so.8.0.61<br>
7fc36f5e9000-7fc3709ba000 rw-p 0249b000 fd:00 59902956                   /usr/local/lib/python3.5/dist-packages/torch/lib/libcurand-3d68c345.so.8.0.61<br>
7fc3709ba000-7fc370ec4000 rw-p 00000000 00:00 0<br>
7fc370ec4000-7fc370ec5000 rw-p <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/pytorch/pytorch/commit/0386d000947b048d7fc52dc893f5cd89990c73a6/hovercard" href="https://github.com/pytorch/pytorch/commit/0386d000947b048d7fc52dc893f5cd89990c73a6"><tt>0386d00</tt></a> fd:00 59902956                   /usr/local/lib/python3.5/dist-packages/torch/lib/libcurand-3d68c345.so.8.0.61<br>
7fc370ec5000-7fc373cdd000 r-xp 00000000 fd:00 59902953                   /usr/local/lib/python3.5/dist-packages/torch/lib/libcublas-e78c880d.so.8.0.88<br>
7fc373cdd000-7fc373edd000 ---p 02e18000 fd:00 59902953                   /usr/local/lib/python3.5/dist-packages/torch/lib/libcublas-e78c880d.so.8.0.88<br>
7fc373edd000-7fc373efb000 rw-p 02e18000 fd:00 59902953                   /usr/local/lib/python3.5/dist-packages/torch/lib/libcublas-e78c880d.so.8.0.88<br>
7fc373efb000-7fc373f0a000 rw-p 00000000 00:00 0<br>
7fc373f0a000-7fc373f0d000 rw-p 02e36000 fd:00 59902953                   /usr/local/lib/python3.5/dist-packages/torch/lib/libcublas-e78c880d.so.8.0.88<br>
7fc373f0d000-7fc373f22000 r-xp 00000000 fd:00 59902949                   /usr/local/lib/python3.5/dist-packages/torch/lib/libgomp-ae56ecdc.so.1.0.0<br>
7fc373f22000-7fc374121000 ---p 00015000 fd:00 59902949                   /usr/local/lib/python3.5/dist-packages/torch/lib/libgomp-ae56ecdc.so.1.0.0<br>
7fc374121000-7fc374124000 rw-p 00014000 fd:00 59902949                   /usr/local/lib/python3.5/dist-packages/torch/lib/libgomp-ae56ecdc.so.1.0.0<br>
7fc374124000-7fc37412b000 r-xp 00000000 fd:00 21239290                   /lib/x86_64-linux-gnu/librt-2.23.so<br>
7fc37412b000-7fc37432a000 ---p 00007000 fd:00 21239290                   /lib/x86_64-linux-gnu/librt-2.23.so<br>
7fc37432a000-7fc37432b000 r--p 00006000 fd:00 21239290                   /lib/x86_64-linux-gnu/librt-2.23.so<br>
7fc37432b000-7fc37432c000 rw-p 00007000 fd:00 21239290                   /lib/x86_64-linux-gnu/librt-2.23.so<br>
7fc37432c000-7fc376e04000 r-xp 00000000 fd:00 59902939                   /usr/local/lib/python3.5/dist-packages/torch/lib/libnccl.so.1<br>
7fc376e04000-7fc377004000 ---p 02ad8000 fd:00 59902939                   /usr/local/lib/python3.5/dist-packages/torch/lib/libnccl.so.1<br>
7fc377004000-7fc377005000 rw-p 02ad8000 fd:00 59902939                   /usr/local/lib/python3.5/dist-packages/torch/lib/libnccl.so.1<br>
7fc377005000-7fc377007000 rw-p 02ae4000 fd:00 59902939                   /usr/local/lib/python3.5/dist-packages/torch/lib/libnccl.so.1<br>
7fc377007000-7fc37ae70000 r-xp 00000000 fd:00 <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/pytorch/pytorch/commit/59902947c80f55b07b84e98cd8939efadfc24141/hovercard" href="https://github.com/pytorch/pytorch/commit/59902947c80f55b07b84e98cd8939efadfc24141"><tt>5990294</tt></a>                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHCUNN.so.1<br>
7fc37ae70000-7fc37b070000 ---p 03e69000 fd:00 <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/pytorch/pytorch/commit/59902947c80f55b07b84e98cd8939efadfc24141/hovercard" href="https://github.com/pytorch/pytorch/commit/59902947c80f55b07b84e98cd8939efadfc24141"><tt>5990294</tt></a>                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHCUNN.so.1<br>
7fc37b070000-7fc37b07f000 rw-p 03e69000 fd:00 <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/pytorch/pytorch/commit/59902947c80f55b07b84e98cd8939efadfc24141/hovercard" href="https://github.com/pytorch/pytorch/commit/59902947c80f55b07b84e98cd8939efadfc24141"><tt>5990294</tt></a>                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHCUNN.so.1<br>
7fc37b07f000-7fc37b09f000 rw-p 00000000 00:00 0<br>
7fc37b09f000-7fc37b367000 rw-p 04124000 fd:00 <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/pytorch/pytorch/commit/59902947c80f55b07b84e98cd8939efadfc24141/hovercard" href="https://github.com/pytorch/pytorch/commit/59902947c80f55b07b84e98cd8939efadfc24141"><tt>5990294</tt></a>                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHCUNN.so.1<br>
7fc37b367000-7fc37b4bf000 r-xp 00000000 fd:00 59902951                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHCS.so.1<br>
7fc37b4bf000-7fc37b6bf000 ---p 00158000 fd:00 59902951                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHCS.so.1<br>
7fc37b6bf000-7fc37b6c1000 rw-p 00158000 fd:00 59902951                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHCS.so.1<br>
7fc37b6c1000-7fc37b6c2000 rw-p 00000000 00:00 0<br>
7fc37b6c2000-7fc37b70a000 rw-p 00182000 fd:00 59902951                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHCS.so.1<br>
7fc37b70a000-7fc38ad78000 r-xp 00000000 fd:00 59902936                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHC.so.1<br>
7fc38ad78000-7fc38af78000 ---p 0f66e000 fd:00 59902936                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHC.so.1<br>
7fc38af78000-7fc38afd2000 rw-p 0f66e000 fd:00 59902936                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHC.so.1<br>
7fc38afd2000-7fc38b03b000 rw-p 00000000 00:00 0<br>
7fc38b03b000-7fc38c9a3000 rw-p 102ce000 fd:00 59902936                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHC.so.1<br>
7fc38c9a3000-7fc38cc04000 r-xp 00000000 fd:00 59902938                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHD.so.1<br>
7fc38cc04000-7fc38ce04000 ---p 00261000 fd:00 59902938                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHD.so.1<br>
7fc38ce04000-7fc38ce0e000 rw-p 00261000 fd:00 59902938                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHD.so.1<br>
7fc38ce0e000-7fc38ce4f000 rw-p 002d4000 fd:00 59902938                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHD.so.1<br>
7fc38ce4f000-7fc38d39c000 r-xp 00000000 fd:00 59902955                   /usr/local/lib/python3.5/dist-packages/torch/lib/libATen.so.1<br>
7fc38d39c000-7fc38d59c000 ---p 0054d000 fd:00 59902955                   /usr/local/lib/python3.5/dist-packages/torch/lib/libATen.so.1<br>
7fc38d59c000-7fc38d5da000 rw-p 0054d000 fd:00 59902955                   /usr/local/lib/python3.5/dist-packages/torch/lib/libATen.so.1<br>
7fc38d5da000-7fc38d703000 rw-p 00681000 fd:00 59902955                   /usr/local/lib/python3.5/dist-packages/torch/lib/libATen.so.1<br>
7fc38d703000-7fc38d81a000 r-xp 00000000 fd:00 59902948                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHNN.so.1<br>
7fc38d81a000-7fc38da1a000 ---p 00117000 fd:00 59902948                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHNN.so.1<br>
7fc38da1a000-7fc38da1b000 rw-p 00117000 fd:00 59902948                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHNN.so.1<br>
7fc38da1b000-7fc38da27000 rw-p 00127000 fd:00 59902948                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHNN.so.1<br>
7fc38da27000-7fc38dc89000 r-xp 00000000 fd:00 59902945                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHPP.so.1<br>
7fc38dc89000-7fc38de89000 ---p 00262000 fd:00 59902945                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHPP.so.1<br>
7fc38de89000-7fc38de9d000 rw-p 00262000 fd:00 59902945                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHPP.so.1<br>
7fc38de9d000-7fc38df4d000 rw-p 00306000 fd:00 59902945                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHPP.so.1<br>
7fc38df4d000-7fc38df7b000 r-xp 00000000 fd:00 59902952                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHS.so.1<br>
7fc38df7b000-7fc38e17b000 ---p 0002e000 fd:00 59902952                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHS.so.1<br>
7fc38e17b000-7fc38e17c000 rw-p 0002e000 fd:00 59902952                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHS.so.1<br>
7fc38e17c000-7fc38e180000 rw-p 00037000 fd:00 59902952                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTHS.so.1<br>
7fc38e180000-7fc39057e000 r-xp 00000000 fd:00 59902950                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTH.so.1<br>
7fc39057e000-7fc39077e000 ---p 023fe000 fd:00 59902950                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTH.so.1<br>
7fc39077e000-7fc3907a5000 rw-p 023fe000 fd:00 59902950                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTH.so.1<br>
7fc3907a5000-7fc3907ed000 rw-p 00000000 00:00 0<br>
7fc3907ed000-7fc39081c000 rw-p 02504000 fd:00 59902950                   /usr/local/lib/python3.5/dist-packages/torch/lib/libTH.so.1<br>
7fc39081c000-7fc399b1b000 r-xp 00000000 fd:00 59902954                   /usr/local/lib/python3.5/dist-packages/torch/lib/libcudnn-3f9a723f.so.6.0.21<br>
7fc399b1b000-7fc399d1a000 ---p 092ff000 fd:00 59902954                   /usr/local/lib/python3.5/dist-packages/torch/lib/libcudnn-3f9a723f.so.6.0.21<br>
7fc399d1a000-7fc399d49000 rw-p 092fe000 fd:00 59902954                   /usr/local/lib/python3.5/dist-packages/torch/lib/libcudnn-3f9a723f.so.6.0.21<br>
7fc399d49000-7fc399d7e000 rw-p 00000000 00:00 0<br>
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7fc3add17000-7fc3ae517000 rw-p 00000000 00:00 0<br>
7fc3ae517000-7fc3ae607000 r-xp 00000000 fd:00 59903582                   /usr/local/lib/python3.5/dist-packages/numpy/.libs/libgfortran-ed201abd.so.3.0.0<br>
7fc3ae607000-7fc3ae806000 ---p 000f0000 fd:00 59903582                   /usr/local/lib/python3.5/dist-packages/numpy/.libs/libgfortran-ed201abd.so.3.0.0<br>
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</blockquote>