[
https://issues.apache.org/jira/browse/ARROW-2448?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Philipp Moritz resolved ARROW-2448.
-----------------------------------
Resolution: Fixed
Fix Version/s: 0.10.0
Issue resolved by pull request 1939
[https://github.com/apache/arrow/pull/1939]
> Segfault when plasma client goes out of scope before buffer.
> ------------------------------------------------------------
>
> Key: ARROW-2448
> URL: https://issues.apache.org/jira/browse/ARROW-2448
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Plasma (C++), Python
> Reporter: Robert Nishihara
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.10.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> The following causes a segfault.
>
> First start a plasma store with
> {code:java}
> plasma_store -s /tmp/store -m 10000000000{code}
> Then run the following in Python.
> {code}
> import pyarrow.plasma as plasma
> import numpy as np
> client = plasma.connect('/tmp/store', '', 0)
> object_id = client.put(np.zeros(3))
> buf = client.get(object_id)
> del client
> del buf # This segfaults.{code}
> The backtrace is
> {code:java}
> (lldb) bt
> * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS
> (code=1, address=0xfffffffffffffffc)
> * frame #0: 0x00000001056deaee
> libplasma.0.dylib`plasma::PlasmaClient::Release(plasma::UniqueID const&) + 142
> frame #1: 0x00000001056de9e9
> libplasma.0.dylib`plasma::PlasmaBuffer::~PlasmaBuffer() + 41
> frame #2: 0x00000001056dec9f libplasma.0.dylib`arrow::Buffer::~Buffer() +
> 63
> frame #3: 0x0000000106206661
> lib.cpython-36m-darwin.so`std::__1::shared_ptr<arrow::Buffer>::~shared_ptr()
> [inlined] std::__1::__shared_count::__release_shared(this=0x00000001019b7d20)
> at memory:3444
> frame #4: 0x0000000106206617
> lib.cpython-36m-darwin.so`std::__1::shared_ptr<arrow::Buffer>::~shared_ptr()
> [inlined]
> std::__1::__shared_weak_count::__release_shared(this=0x00000001019b7d20) at
> memory:3486
> frame #5: 0x0000000106206617
> lib.cpython-36m-darwin.so`std::__1::shared_ptr<arrow::Buffer>::~shared_ptr(this=0x0000000100791780)
> at memory:4412
> frame #6: 0x0000000106002b35
> lib.cpython-36m-darwin.so`std::__1::shared_ptr<arrow::Buffer>::~shared_ptr(this=0x0000000100791780)
> at memory:4410
> frame #7: 0x00000001061052c5 lib.cpython-36m-darwin.so`void
> __Pyx_call_destructor<std::__1::shared_ptr<arrow::Buffer>
> >(x=std::__1::shared_ptr<arrow::Buffer>::element_type @ 0x00000001019b7d38
> strong=0 weak=1) at lib.cxx:486
> frame #8: 0x0000000106104f93
> lib.cpython-36m-darwin.so`__pyx_tp_dealloc_7pyarrow_3lib_Buffer(o=0x0000000100791768)
> at lib.cxx:107704
> frame #9: 0x00000001069fcd54
> multiarray.cpython-36m-darwin.so`array_dealloc + 292
> frame #10: 0x00000001000e8daf
> libpython3.6m.dylib`_PyDict_DelItem_KnownHash + 463
> frame #11: 0x0000000100171899
> libpython3.6m.dylib`_PyEval_EvalFrameDefault + 13321
> frame #12: 0x00000001001791ef
> libpython3.6m.dylib`_PyEval_EvalCodeWithName + 2447
> frame #13: 0x000000010016e3d4 libpython3.6m.dylib`PyEval_EvalCode + 100
> frame #14: 0x00000001001a3bd6
> libpython3.6m.dylib`PyRun_InteractiveOneObject + 582
> frame #15: 0x00000001001a350e
> libpython3.6m.dylib`PyRun_InteractiveLoopFlags + 222
> frame #16: 0x00000001001a33fc libpython3.6m.dylib`PyRun_AnyFileExFlags +
> 60
> frame #17: 0x00000001001bc835 libpython3.6m.dylib`Py_Main + 3829
> frame #18: 0x0000000100000df8 python`main + 232
> frame #19: 0x00007fff6cd80015 libdyld.dylib`start + 1
> frame #20: 0x00007fff6cd80015 libdyld.dylib`start + 1{code}
> Basically, the issue is that when the buffer goes out of scope, it calls
> {{Release}} on the plasma client, but the client has already been deallocated.
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