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Title: Issue 27987: obmalloc's 8-byte alignment causes undefined behavior - Python tracker

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This issue has been migrated to GitHub: https://github.com/python/cpython/issues/72174 https://github.com/python/cpython/issues/72174
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Nosy Listhttp://docs.python.org/devguide/triaging.html#nosy-list
Priorityhttp://docs.python.org/devguide/triaging.html#priority
Keywordshttp://docs.python.org/devguide/triaging.html#keywords
alignment.patchhttps://bugs.python.org/file44413/alignment.patch
reviewhttps://bugs.python.org/review/27987/#ps18371
PR 12850https://github.com/python/cpython/pull/12850
PR 13318https://github.com/python/cpython/pull/13318
PR 13319https://github.com/python/cpython/pull/13319
PR 13335https://github.com/python/cpython/pull/13335
PR 13336https://github.com/python/cpython/pull/13336
PR 13569https://github.com/python/cpython/pull/13569
PR 13581https://github.com/python/cpython/pull/13581
msg274688https://bugs.python.org/issue27987#msg274688
(view)https://bugs.python.org/msg274688
msg304873https://bugs.python.org/issue27987#msg304873
(view)https://bugs.python.org/msg304873
msg304874https://bugs.python.org/issue27987#msg304874
(view)https://bugs.python.org/msg304874
msg304912https://bugs.python.org/issue27987#msg304912
(view)https://bugs.python.org/msg304912
#18835https://bugs.python.org/issue18835
msg304917https://bugs.python.org/issue27987#msg304917
(view)https://bugs.python.org/msg304917
msg304918https://bugs.python.org/issue27987#msg304918
(view)https://bugs.python.org/msg304918
msg304919https://bugs.python.org/issue27987#msg304919
(view)https://bugs.python.org/msg304919
msg304922https://bugs.python.org/issue27987#msg304922
(view)https://bugs.python.org/msg304922
msg304925https://bugs.python.org/issue27987#msg304925
(view)https://bugs.python.org/msg304925
msg304959https://bugs.python.org/issue27987#msg304959
(view)https://bugs.python.org/msg304959
msg305847https://bugs.python.org/issue27987#msg305847
(view)https://bugs.python.org/msg305847
msg305939https://bugs.python.org/issue27987#msg305939
(view)https://bugs.python.org/msg305939
msg305985https://bugs.python.org/issue27987#msg305985
(view)https://bugs.python.org/msg305985
https://mail.python.org/pipermail/python-dev/2017-September/149307.htmlhttps://mail.python.org/pipermail/python-dev/2017-September/149307.html
msg311323https://bugs.python.org/issue27987#msg311323
(view)https://bugs.python.org/msg311323
https://mail.python.org/pipermail/python-dev/2018-January/152011.htmlhttps://mail.python.org/pipermail/python-dev/2018-January/152011.html
msg340120https://bugs.python.org/issue27987#msg340120
(view)https://bugs.python.org/msg340120
bpo-36618https://bugs.python.org/issue36618
msg340179https://bugs.python.org/issue27987#msg340179
(view)https://bugs.python.org/msg340179
msg340254https://bugs.python.org/issue27987#msg340254
(view)https://bugs.python.org/msg340254
bpo-36618https://bugs.python.org/issue36618
msg340264https://bugs.python.org/issue27987#msg340264
(view)https://bugs.python.org/msg340264
bpo-33374https://bugs.python.org/issue33374
msg340265https://bugs.python.org/issue27987#msg340265
(view)https://bugs.python.org/msg340265
msg340266https://bugs.python.org/issue27987#msg340266
(view)https://bugs.python.org/msg340266
msg340330https://bugs.python.org/issue27987#msg340330
(view)https://bugs.python.org/msg340330
https://software.intel.com/sites/default/files/article/402129/mpx-linux64-abi.pdfhttps://software.intel.com/sites/default/files/article/402129/mpx-linux64-abi.pdf
PR-12850https://github.com/python/cpython/pull/12850
msg340331https://bugs.python.org/issue27987#msg340331
(view)https://bugs.python.org/msg340331
https://bugs.python.org/issue36618#msg340261https://bugs.python.org/issue36618#msg340261
msg342440https://bugs.python.org/issue27987#msg342440
(view)https://bugs.python.org/msg342440
msg342441https://bugs.python.org/issue27987#msg342441
(view)https://bugs.python.org/msg342441
msg342443https://bugs.python.org/issue27987#msg342443
(view)https://bugs.python.org/msg342443
f0be4bbb9b3cee876249c23f2ae6f38f43fa7495https://hg.python.org/lookup/f0be4bbb9b3cee876249c23f2ae6f38f43fa7495
bpo-27987https://bugs.python.org/issue27987
GH-12850https://github.com/python/cpython/pull/12850
https://github.com/python/cpython/commit/f0be4bbb9b3cee876249c23f2ae6f38f43fa7495https://github.com/python/cpython/commit/f0be4bbb9b3cee876249c23f2ae6f38f43fa7495
msg342445https://bugs.python.org/issue27987#msg342445
(view)https://bugs.python.org/msg342445
msg342447https://bugs.python.org/issue27987#msg342447
(view)https://bugs.python.org/msg342447
http://jemalloc.net/jemalloc.3.html#size_classeshttp://jemalloc.net/jemalloc.3.html#size_classes
msg342575https://bugs.python.org/issue27987#msg342575
(view)https://bugs.python.org/msg342575
f24a9f3bf42709fb97b954b6dd6f90853967712ehttps://hg.python.org/lookup/f24a9f3bf42709fb97b954b6dd6f90853967712e
bpo-27987https://bugs.python.org/issue27987
GH-12850https://github.com/python/cpython/pull/12850
GH-13319https://github.com/python/cpython/pull/13319
https://github.com/python/cpython/commit/f24a9f3bf42709fb97b954b6dd6f90853967712ehttps://github.com/python/cpython/commit/f24a9f3bf42709fb97b954b6dd6f90853967712e
msg343133https://bugs.python.org/issue27987#msg343133
(view)https://bugs.python.org/msg343133
msg343134https://bugs.python.org/issue27987#msg343134
(view)https://bugs.python.org/msg343134
bpo-18835https://bugs.python.org/issue18835
bpo-36618https://bugs.python.org/issue36618
https://bugs.python.org/issue36618#msg340279https://bugs.python.org/issue36618#msg340279
msg343218https://bugs.python.org/issue27987#msg343218
(view)https://bugs.python.org/msg343218
msg343219https://bugs.python.org/issue27987#msg343219
(view)https://bugs.python.org/msg343219
msg343471https://bugs.python.org/issue27987#msg343471
(view)https://bugs.python.org/msg343471
ea2b76bdc5f97f49701213d105b8ec2387ea2fa5https://hg.python.org/lookup/ea2b76bdc5f97f49701213d105b8ec2387ea2fa5
bpo-27987https://bugs.python.org/issue27987
GH-13335https://github.com/python/cpython/pull/13335
https://github.com/python/cpython/commit/ea2b76bdc5f97f49701213d105b8ec2387ea2fa5https://github.com/python/cpython/commit/ea2b76bdc5f97f49701213d105b8ec2387ea2fa5
msg343489https://bugs.python.org/issue27987#msg343489
(view)https://bugs.python.org/msg343489
https://github.com/python/cpython/commit/e348c8d154cf6342c79d627ebfe89dfe9de23817#diff-fb41bdaf12f733cf6ab8a82677d03adchttps://github.com/python/cpython/commit/e348c8d154cf6342c79d627ebfe89dfe9de23817#diff-fb41bdaf12f733cf6ab8a82677d03adc
https://buildbot.python.org/all/#/builders/137/builds/878https://buildbot.python.org/all/#/builders/137/builds/878
https://buildbot.python.org/all/#/builders/137/builds/879https://buildbot.python.org/all/#/builders/137/builds/879
msg343492https://bugs.python.org/issue27987#msg343492
(view)https://bugs.python.org/msg343492
https://github.com/python/cpython/commit/2156fec1f7a8f9972e90cdbaf404e3fd9eaccb35https://github.com/python/cpython/commit/2156fec1f7a8f9972e90cdbaf404e3fd9eaccb35
msg343493https://bugs.python.org/issue27987#msg343493
(view)https://bugs.python.org/msg343493
1b85f4ec45a5d63188ee3866bd55eb29fdec7fbfhttps://hg.python.org/lookup/1b85f4ec45a5d63188ee3866bd55eb29fdec7fbf
bpo-27987https://bugs.python.org/issue27987
GH-12850https://github.com/python/cpython/pull/12850
https://github.com/python/cpython/commit/1b85f4ec45a5d63188ee3866bd55eb29fdec7fbfhttps://github.com/python/cpython/commit/1b85f4ec45a5d63188ee3866bd55eb29fdec7fbf
msg343495https://bugs.python.org/issue27987#msg343495
(view)https://bugs.python.org/msg343495
msg343498https://bugs.python.org/issue27987#msg343498
(view)https://bugs.python.org/msg343498
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dai0274b/index.htmlhttp://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dai0274b/index.html
http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042d/IHI0042D_aapcs.pdfhttp://infocenter.arm.com/help/topic/com.arm.doc.ihi0042d/IHI0042D_aapcs.pdf
https://www.codesynthesis.com/~boris/blog/2009/04/06/cxx-data-alignment-portability/https://www.codesynthesis.com/~boris/blog/2009/04/06/cxx-data-alignment-portability/
msg343499https://bugs.python.org/issue27987#msg343499
(view)https://bugs.python.org/msg343499
msg343500https://bugs.python.org/issue27987#msg343500
(view)https://bugs.python.org/msg343500
msg344364https://bugs.python.org/issue27987#msg344364
(view)https://bugs.python.org/msg344364
8766cb74e186d3820db0a855ccd780d6d84461f7https://hg.python.org/lookup/8766cb74e186d3820db0a855ccd780d6d84461f7
bpo-27987https://bugs.python.org/issue27987
GH-13335https://github.com/python/cpython/pull/13335
GH-13581https://github.com/python/cpython/pull/13581
https://github.com/python/cpython/commit/8766cb74e186d3820db0a855ccd780d6d84461f7https://github.com/python/cpython/commit/8766cb74e186d3820db0a855ccd780d6d84461f7
msg344364https://bugs.python.org/msg344364
pull_request13488https://bugs.python.org/pull_request13488
msg343500https://bugs.python.org/msg343500
msg343499https://bugs.python.org/msg343499
msg343498https://bugs.python.org/msg343498
msg343495https://bugs.python.org/msg343495
miss-islingtonhttps://bugs.python.org/user27838
msg343493https://bugs.python.org/msg343493
msg343492https://bugs.python.org/msg343492
pull_request13478https://bugs.python.org/pull_request13478
msg343489https://bugs.python.org/msg343489
msg343471https://bugs.python.org/msg343471
msg343219https://bugs.python.org/msg343219
msg343218https://bugs.python.org/msg343218
msg343134https://bugs.python.org/msg343134
msg343133https://bugs.python.org/msg343133
msg342575https://bugs.python.org/msg342575
pull_request13248https://bugs.python.org/pull_request13248
pull_request13247https://bugs.python.org/pull_request13247
pull_request13230https://bugs.python.org/pull_request13230
pull_request13229https://bugs.python.org/pull_request13229
msg342447https://bugs.python.org/msg342447
msg342445https://bugs.python.org/msg342445
msg342443https://bugs.python.org/msg342443
msg342441https://bugs.python.org/msg342441
msg342440https://bugs.python.org/msg342440
msg340331https://bugs.python.org/msg340331
msg340330https://bugs.python.org/msg340330
pull_request12775https://bugs.python.org/pull_request12775
msg340266https://bugs.python.org/msg340266
msg340265https://bugs.python.org/msg340265
msg340264https://bugs.python.org/msg340264
msg340254https://bugs.python.org/msg340254
msg340179https://bugs.python.org/msg340179
methanehttps://bugs.python.org/user10371
msg340120https://bugs.python.org/msg340120
tgrigghttps://bugs.python.org/user28400
fweimerhttps://bugs.python.org/user17414
msg311323https://bugs.python.org/msg311323
twoutershttps://bugs.python.org/user14
gregory.p.smithhttps://bugs.python.org/user252
naschemehttps://bugs.python.org/user83
msg305985https://bugs.python.org/msg305985
msg305939https://bugs.python.org/msg305939
msg305847https://bugs.python.org/msg305847
msg304959https://bugs.python.org/msg304959
skrahhttps://bugs.python.org/user11089
msg304925https://bugs.python.org/msg304925
msg304922https://bugs.python.org/msg304922
msg304919https://bugs.python.org/msg304919
msg304918https://bugs.python.org/msg304918
msg304917https://bugs.python.org/msg304917
msg304912https://bugs.python.org/msg304912
vstinnerhttps://bugs.python.org/user2377
msg304874https://bugs.python.org/msg304874
pitrouhttps://bugs.python.org/user2040
msg304873https://bugs.python.org/msg304873
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