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https://issues.apache.org/jira/browse/IMPALA-9767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17224806#comment-17224806
]
Fang-Yu Rao commented on IMPALA-9767:
-------------------------------------
Thanks [~joemcdonnell]! I think the scenario you described is possible! I will
take a much closer look at this loop and try to see if we need to use a lock to
prevent a state change in this loop. Will get back to you if I have any
questions.
> ASAN crash during coordinator runtime filter updates
> ----------------------------------------------------
>
> Key: IMPALA-9767
> URL: https://issues.apache.org/jira/browse/IMPALA-9767
> Project: IMPALA
> Issue Type: Bug
> Reporter: Sahil Takiar
> Assignee: Fang-Yu Rao
> Priority: Major
> Labels: asan, broken-build, crash
> Attachments: consoleFull_asan_939.txt
>
>
> ASAN crash output:
> {code:java}
> Error MessageAddress Sanitizer message detected in
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/logs/ee_tests/impalad.ERRORStandard
> Error==4808==ERROR: AddressSanitizer: heap-use-after-free on address
> 0x7f6288cbe818 at pc 0x00000199f6fe bp 0x7f63c1a8b270 sp 0x7f63c1a8aa20
> READ of size 1048576 at 0x7f6288cbe818 thread T73 (rpc reactor-552)
> #0 0x199f6fd in read_iovec(void*, __sanitizer::__sanitizer_iovec*,
> unsigned long, unsigned long)
> /mnt/source/llvm/llvm-5.0.1.src-p2/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:904
> #1 0x19a1f57 in read_msghdr(void*, __sanitizer::__sanitizer_msghdr*,
> long)
> /mnt/source/llvm/llvm-5.0.1.src-p2/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:2781
> #2 0x19a46c3 in __interceptor_sendmsg
> /mnt/source/llvm/llvm-5.0.1.src-p2/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:2796
> #3 0x372034d in kudu::Socket::Writev(iovec const*, int, long*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/kudu/util/net/socket.cc:447:3
> #4 0x331c095 in kudu::rpc::OutboundTransfer::SendBuffer(kudu::Socket&)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/kudu/rpc/transfer.cc:227:26
> #5 0x3324da1 in kudu::rpc::Connection::WriteHandler(ev::io&, int)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/kudu/rpc/connection.cc:802:31
> #6 0x52ca4e2 in ev_invoke_pending
> (/data0/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/build/debug/service/impalad+0x52ca4e2)
> #7 0x32aeadc in kudu::rpc::ReactorThread::InvokePendingCb(ev_loop*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/kudu/rpc/reactor.cc:196:3
> #8 0x52cdb03 in ev_run
> (/data0/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/build/debug/service/impalad+0x52cdb03)
> #9 0x32aecd1 in kudu::rpc::ReactorThread::RunThread()
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/kudu/rpc/reactor.cc:497:9
> #10 0x32c08db in boost::_bi::bind_t<void, boost::_mfi::mf0<void,
> kudu::rpc::ReactorThread>,
> boost::_bi::list1<boost::_bi::value<kudu::rpc::ReactorThread*> >
> >::operator()()
> /data/jenkins/workspace/impala-asf-master-core-asan/Impala-Toolchain/boost-1.61.0-p2/include/boost/bind/bind.hpp:1222:16
> #11 0x2148c26 in boost::function0<void>::operator()() const
> /data/jenkins/workspace/impala-asf-master-core-asan/Impala-Toolchain/boost-1.61.0-p2/include/boost/function/function_template.hpp:770:14
> #12 0x2144b29 in kudu::Thread::SuperviseThread(void*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/kudu/util/thread.cc:675:3
> #13 0x7f6c0bcf4e24 in start_thread (/lib64/libpthread.so.0+0x7e24)
> #14 0x7f6c0885834c in __clone (/lib64/libc.so.6+0xf834c)
> 0x7f6288cbe818 is located 24 bytes inside of 1052640-byte region
> [0x7f6288cbe800,0x7f6288dbf7e0)
> freed by thread T114 here:
> #0 0x1a773e0 in operator delete(void*)
> /mnt/source/llvm/llvm-5.0.1.src-p2/projects/compiler-rt/lib/asan/asan_new_delete.cc:137
> #1 0x7f6c090faed3 in __gnu_cxx::new_allocator<char>::deallocate(char*,
> unsigned long)
> /mnt/source/gcc/build-4.9.2/x86_64-unknown-linux-gnu/libstdc++-v3/include/ext/new_allocator.h:110
> #2 0x7f6c090faed3 in std::string::_Rep::_M_destroy(std::allocator<char>
> const&)
> /mnt/source/gcc/build-4.9.2/x86_64-unknown-linux-gnu/libstdc++-v3/include/bits/basic_string.tcc:449
> #3 0x7f6c090faed3 in std::string::_Rep::_M_dispose(std::allocator<char>
> const&)
> /mnt/source/gcc/build-4.9.2/x86_64-unknown-linux-gnu/libstdc++-v3/include/bits/basic_string.h:249
> #4 0x7f6c090faed3 in std::string::reserve(unsigned long)
> /mnt/source/gcc/build-4.9.2/x86_64-unknown-linux-gnu/libstdc++-v3/include/bits/basic_string.tcc:511
> #5 0x2781865 in
> impala::ClientRequestState::UpdateFilter(impala::UpdateFilterParamsPB const&,
> kudu::rpc::RpcContext*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/service/client-request-state.cc:1451:11
> #6 0x26d57d5 in
> impala::ImpalaServer::UpdateFilter(impala::UpdateFilterResultPB*,
> impala::UpdateFilterParamsPB const&, kudu::rpc::RpcContext*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/service/impala-server.cc:2694:19
> #7 0x266bd65 in
> impala::DataStreamService::UpdateFilter(impala::UpdateFilterParamsPB const*,
> impala::UpdateFilterResultPB*, kudu::rpc::RpcContext*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/service/data-stream-service.cc:119:44
> #8 0x27a1eed in std::_Function_handler<void (google::protobuf::Message
> const*, google::protobuf::Message*, kudu::rpc::RpcContext*),
> impala::DataStreamServiceIf::DataStreamServiceIf(scoped_refptr<kudu::MetricEntity>
> const&, scoped_refptr<kudu::rpc::ResultTracker>
> const&)::$_5>::_M_invoke(std::_Any_data const&, google::protobuf::Message
> const*, google::protobuf::Message*, kudu::rpc::RpcContext*)
> /data/jenkins/workspace/impala-asf-master-core-asan/Impala-Toolchain/gcc-4.9.2/lib/gcc/x86_64-unknown-linux-gnu/4.9.2/../../../../include/c++/4.9.2/functional:2039:2
> #9 0x3312e70 in std::function<void (google::protobuf::Message const*,
> google::protobuf::Message*,
> kudu::rpc::RpcContext*)>::operator()(google::protobuf::Message const*,
> google::protobuf::Message*, kudu::rpc::RpcContext*) const
> /data/jenkins/workspace/impala-asf-master-core-asan/Impala-Toolchain/gcc-4.9.2/lib/gcc/x86_64-unknown-linux-gnu/4.9.2/../../../../include/c++/4.9.2/functional:2439:14
> #10 0x3312231 in
> kudu::rpc::GeneratedServiceIf::Handle(kudu::rpc::InboundCall*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/kudu/rpc/service_if.cc:139:3
> #11 0x22f557b in impala::ImpalaServicePool::RunThread()
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/rpc/impala-service-pool.cc:272:15
> #12 0x22fe3fb in boost::_bi::bind_t<void, boost::_mfi::mf0<void,
> impala::ImpalaServicePool>,
> boost::_bi::list1<boost::_bi::value<impala::ImpalaServicePool*> >
> >::operator()()
> /data/jenkins/workspace/impala-asf-master-core-asan/Impala-Toolchain/boost-1.61.0-p2/include/boost/bind/bind.hpp:1222:16
> #13 0x2148c26 in boost::function0<void>::operator()() const
> /data/jenkins/workspace/impala-asf-master-core-asan/Impala-Toolchain/boost-1.61.0-p2/include/boost/function/function_template.hpp:770:14
> #14 0x2a8c116 in impala::Thread::SuperviseThread(std::string const&,
> std::string const&, boost::function<void ()>, impala::ThreadDebugInfo const*,
> impala::Promise<long, (impala::PromiseMode)0>*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/util/thread.cc:360:3
> #15 0x2a97998 in void boost::_bi::list5<boost::_bi::value<std::string>,
> boost::_bi::value<std::string>, boost::_bi::value<boost::function<void ()> >,
> boost::_bi::value<impala::ThreadDebugInfo*>,
> boost::_bi::value<impala::Promise<long, (impala::PromiseMode)0>*>
> >::operator()<void (*)(std::string const&, std::string const&,
> boost::function<void ()>, impala::ThreadDebugInfo const*,
> impala::Promise<long, (impala::PromiseMode)0>*),
> boost::_bi::list0>(boost::_bi::type<void>, void (*&)(std::string const&,
> std::string const&, boost::function<void ()>, impala::ThreadDebugInfo const*,
> impala::Promise<long, (impala::PromiseMode)0>*), boost::_bi::list0&, int)
> /data/jenkins/workspace/impala-asf-master-core-asan/Impala-Toolchain/boost-1.61.0-p2/include/boost/bind/bind.hpp:531:9
> #16 0x2a977eb in boost::_bi::bind_t<void, void (*)(std::string const&,
> std::string const&, boost::function<void ()>, impala::ThreadDebugInfo const*,
> impala::Promise<long, (impala::PromiseMode)0>*),
> boost::_bi::list5<boost::_bi::value<std::string>,
> boost::_bi::value<std::string>, boost::_bi::value<boost::function<void ()> >,
> boost::_bi::value<impala::ThreadDebugInfo*>,
> boost::_bi::value<impala::Promise<long, (impala::PromiseMode)0>*> >
> >::operator()()
> /data/jenkins/workspace/impala-asf-master-core-asan/Impala-Toolchain/boost-1.61.0-p2/include/boost/bind/bind.hpp:1222:16
> #17 0x41a8939 in thread_proxy
> (/data0/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/build/debug/service/impalad+0x41a8939)
> previously allocated by thread T109 here:
> #0 0x1a76668 in operator new(unsigned long)
> /mnt/source/llvm/llvm-5.0.1.src-p2/projects/compiler-rt/lib/asan/asan_new_delete.cc:92
> #1 0x7f6c090fa168 in __gnu_cxx::new_allocator<char>::allocate(unsigned
> long, void const*)
> /mnt/source/gcc/build-4.9.2/x86_64-unknown-linux-gnu/libstdc++-v3/include/ext/new_allocator.h:104
> #2 0x7f6c090fa168 in std::string::_Rep::_S_create(unsigned long, unsigned
> long, std::allocator<char> const&)
> /mnt/source/gcc/build-4.9.2/x86_64-unknown-linux-gnu/libstdc++-v3/include/bits/basic_string.tcc:607
> #3 0x7f6c090fbb7b in _S_construct_aux<char const*>
> /mnt/source/gcc/build-4.9.2/x86_64-unknown-linux-gnu/libstdc++-v3/include/bits/basic_string.h:1743
> #4 0x7f6c090fbb7b in _S_construct<char const*>
> /mnt/source/gcc/build-4.9.2/x86_64-unknown-linux-gnu/libstdc++-v3/include/bits/basic_string.h:1764
> #5 0x7f6c090fbb7b in std::basic_string<char, std::char_traits<char>,
> std::allocator<char> >::basic_string(char const*, unsigned long,
> std::allocator<char> const&)
> /mnt/source/gcc/build-4.9.2/x86_64-unknown-linux-gnu/libstdc++-v3/include/bits/basic_string.tcc:207
> #6 0x338b610 in
> impala::Coordinator::FilterState::ApplyUpdate(impala::UpdateFilterParamsPB
> const&, impala::Coordinator*, kudu::rpc::RpcContext*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/runtime/coordinator.cc:1417:51
> #7 0x338a4c0 in
> impala::Coordinator::UpdateFilter(impala::UpdateFilterParamsPB const&,
> kudu::rpc::RpcContext*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/runtime/coordinator.cc:1315:12
> #8 0x2781865 in
> impala::ClientRequestState::UpdateFilter(impala::UpdateFilterParamsPB const&,
> kudu::rpc::RpcContext*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/service/client-request-state.cc:1451:11
> #9 0x26d57d5 in
> impala::ImpalaServer::UpdateFilter(impala::UpdateFilterResultPB*,
> impala::UpdateFilterParamsPB const&, kudu::rpc::RpcContext*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/service/impala-server.cc:2694:19
> #10 0x266bd65 in
> impala::DataStreamService::UpdateFilter(impala::UpdateFilterParamsPB const*,
> impala::UpdateFilterResultPB*, kudu::rpc::RpcContext*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/service/data-stream-service.cc:119:44
> #11 0x27a1eed in std::_Function_handler<void (google::protobuf::Message
> const*, google::protobuf::Message*, kudu::rpc::RpcContext*),
> impala::DataStreamServiceIf::DataStreamServiceIf(scoped_refptr<kudu::MetricEntity>
> const&, scoped_refptr<kudu::rpc::ResultTracker>
> const&)::$_5>::_M_invoke(std::_Any_data const&, google::protobuf::Message
> const*, google::protobuf::Message*, kudu::rpc::RpcContext*)
> /data/jenkins/workspace/impala-asf-master-core-asan/Impala-Toolchain/gcc-4.9.2/lib/gcc/x86_64-unknown-linux-gnu/4.9.2/../../../../include/c++/4.9.2/functional:2039:2
> #12 0x3312e70 in std::function<void (google::protobuf::Message const*,
> google::protobuf::Message*,
> kudu::rpc::RpcContext*)>::operator()(google::protobuf::Message const*,
> google::protobuf::Message*, kudu::rpc::RpcContext*) const
> /data/jenkins/workspace/impala-asf-master-core-asan/Impala-Toolchain/gcc-4.9.2/lib/gcc/x86_64-unknown-linux-gnu/4.9.2/../../../../include/c++/4.9.2/functional:2439:14
> #13 0x3312231 in
> kudu::rpc::GeneratedServiceIf::Handle(kudu::rpc::InboundCall*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/kudu/rpc/service_if.cc:139:3
> #14 0x22f557b in impala::ImpalaServicePool::RunThread()
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/rpc/impala-service-pool.cc:272:15
> #15 0x22fe3fb in boost::_bi::bind_t<void, boost::_mfi::mf0<void,
> impala::ImpalaServicePool>,
> boost::_bi::list1<boost::_bi::value<impala::ImpalaServicePool*> >
> >::operator()()
> /data/jenkins/workspace/impala-asf-master-core-asan/Impala-Toolchain/boost-1.61.0-p2/include/boost/bind/bind.hpp:1222:16
> #16 0x2148c26 in boost::function0<void>::operator()() const
> /data/jenkins/workspace/impala-asf-master-core-asan/Impala-Toolchain/boost-1.61.0-p2/include/boost/function/function_template.hpp:770:14
> #17 0x2a8c116 in impala::Thread::SuperviseThread(std::string const&,
> std::string const&, boost::function<void ()>, impala::ThreadDebugInfo const*,
> impala::Promise<long, (impala::PromiseMode)0>*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/util/thread.cc:360:3
> #18 0x2a97998 in void boost::_bi::list5<boost::_bi::value<std::string>,
> boost::_bi::value<std::string>, boost::_bi::value<boost::function<void ()> >,
> boost::_bi::value<impala::ThreadDebugInfo*>,
> boost::_bi::value<impala::Promise<long, (impala::PromiseMode)0>*>
> >::operator()<void (*)(std::string const&, std::string const&,
> boost::function<void ()>, impala::ThreadDebugInfo const*,
> impala::Promise<long, (impala::PromiseMode)0>*),
> boost::_bi::list0>(boost::_bi::type<void>, void (*&)(std::string const&,
> std::string const&, boost::function<void ()>, impala::ThreadDebugInfo const*,
> impala::Promise<long, (impala::PromiseMode)0>*), boost::_bi::list0&, int)
> /data/jenkins/workspace/impala-asf-master-core-asan/Impala-Toolchain/boost-1.61.0-p2/include/boost/bind/bind.hpp:531:9
> #19 0x2a977eb in boost::_bi::bind_t<void, void (*)(std::string const&,
> std::string const&, boost::function<void ()>, impala::ThreadDebugInfo const*,
> impala::Promise<long, (impala::PromiseMode)0>*),
> boost::_bi::list5<boost::_bi::value<std::string>,
> boost::_bi::value<std::string>, boost::_bi::value<boost::function<void ()> >,
> boost::_bi::value<impala::ThreadDebugInfo*>,
> boost::_bi::value<impala::Promise<long, (impala::PromiseMode)0>*> >
> >::operator()()
> /data/jenkins/workspace/impala-asf-master-core-asan/Impala-Toolchain/boost-1.61.0-p2/include/boost/bind/bind.hpp:1222:16
> #20 0x41a8939 in thread_proxy
> (/data0/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/build/debug/service/impalad+0x41a8939)
> Thread T73 (rpc reactor-552) created by T0 here:
> #0 0x198755d in __interceptor_pthread_create
> /mnt/source/llvm/llvm-5.0.1.src-p2/projects/compiler-rt/lib/asan/asan_interceptors.cc:317
> #1 0x2143d2c in kudu::Thread::StartThread(std::string const&, std::string
> const&, boost::function<void ()> const&, unsigned long,
> scoped_refptr<kudu::Thread>*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/kudu/util/thread.cc:619:15
> #2 0x32b8755 in kudu::Status kudu::Thread::Create<void
> (kudu::rpc::ReactorThread::*)(), kudu::rpc::ReactorThread*>(std::string
> const&, std::string const&, void (kudu::rpc::ReactorThread::* const&)(),
> kudu::rpc::ReactorThread* const&, scoped_refptr<kudu::Thread>*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/kudu/util/thread.h:164:12
> #3 0x32ae5a4 in kudu::rpc::ReactorThread::Init()
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/kudu/rpc/reactor.cc:188:10
> #4 0x32b6602 in kudu::rpc::Reactor::Init()
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/kudu/rpc/reactor.cc:762:18
> #5 0x329bffb in kudu::rpc::Messenger::Init()
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/kudu/rpc/messenger.cc:447:5
> #6 0x329b6ab in
> kudu::rpc::MessengerBuilder::Build(std::shared_ptr<kudu::rpc::Messenger>*)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/kudu/rpc/messenger.cc:203:3
> #7 0x22dae9f in impala::RpcMgr::Init(impala::TNetworkAddress const&)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/rpc/rpc-mgr.cc:151:3
> #8 0x2343545 in impala::ExecEnv::Init()
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/runtime/exec-env.cc:385:3
> #9 0x26a8422 in ImpaladMain(int, char**)
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/service/impalad-main.cc:73:3
> #10 0x1a7aa9d in main
> /data/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/src/service/daemon-main.cc:37:12
> #11 0x7f6c08781c04 in __libc_start_main (/lib64/libc.so.6+0x21c04)
> Thread T114 created by T0 here:
> #0 0x198755d in __interceptor_pthread_create
> /mnt/source/llvm/llvm-5.0.1.src-p2/projects/compiler-rt/lib/asan/asan_interceptors.cc:317
> #1 0x41a7cc9 in boost::thread::start_thread_noexcept()
> (/data0/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/build/debug/service/impalad+0x41a7cc9)
> #2 0x45e0360d (<unknown module>)
> Thread T109 created by T0 here:
> #0 0x198755d in __interceptor_pthread_create
> /mnt/source/llvm/llvm-5.0.1.src-p2/projects/compiler-rt/lib/asan/asan_interceptors.cc:317
> #1 0x41a7cc9 in boost::thread::start_thread_noexcept()
> (/data0/jenkins/workspace/impala-asf-master-core-asan/repos/Impala/be/build/debug/service/impalad+0x41a7cc9)
> #2 0x45e0360d (<unknown module>)
> SUMMARY: AddressSanitizer: heap-use-after-free
> /mnt/source/llvm/llvm-5.0.1.src-p2/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:904
> in read_iovec(void*, __sanitizer::__sanitizer_iovec*, unsigned long,
> unsigned long)
> Shadow bytes around the buggy address:
> 0x0fecd118fcb0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
> 0x0fecd118fcc0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
> 0x0fecd118fcd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
> 0x0fecd118fce0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
> 0x0fecd118fcf0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
> =>0x0fecd118fd00: fd fd fd[fd]fd fd fd fd fd fd fd fd fd fd fd fd
> 0x0fecd118fd10: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
> 0x0fecd118fd20: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
> 0x0fecd118fd30: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
> 0x0fecd118fd40: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
> 0x0fecd118fd50: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
> Shadow byte legend (one shadow byte represents 8 application bytes):
> Addressable: 00
> Partially addressable: 01 02 03 04 05 06 07
> Heap left redzone: fa
> Freed heap region: fd
> Stack left redzone: f1
> Stack mid redzone: f2
> Stack right redzone: f3
> Stack after return: f5
> Stack use after scope: f8
> Global redzone: f9
> Global init order: f6
> Poisoned by user: f7
> Container overflow: fc
> Array cookie: ac
> Intra object redzone: bb
> ASan internal: fe
> Left alloca redzone: ca
> Right alloca redzone: cb
> ==4808==ABORTING {code}
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