I have same problem with same sdk version in ubuntu 18.04:
tests/python/unittest/test_target_codegen_hexagon.py Process 23044 stopped and restarted: thread 1 received signal: SIGCHLD
Process 23044 stopped and restarted: thread 1 received signal: SIGCHLD
.Process 23044 stopped and restarted: thread 1 received signal: SIGCHLD
...Process 23044 stopped
* thread #1, name = 'python3', stop reason = signal SIGSEGV: invalid address (fault address: 0x34)
frame #0: 0x00007fffcedcb4fb libLLVM-10.so.1`___lldb_unnamed_symbol30093$$libLLVM-10.so.1 + 11
libLLVM-10.so.1`___lldb_unnamed_symbol30093$$libLLVM-10.so.1:
-> 0x7fffcedcb4fb <+11>: movl 0x34(%rsi), %eax
0x7fffcedcb4fe <+14>: addl $-0x2, %eax
0x7fffcedcb501 <+17>: cmpl $0x1e, %eax
0x7fffcedcb504 <+20>: ja 0x7fffcedcb523 ; <+51>
(lldb) bt
* thread #1, name = 'python3', stop reason = signal SIGSEGV: invalid address (fault address: 0x34)
* frame #0: 0x00007fffcedcb4fb libLLVM-10.so.1`___lldb_unnamed_symbol30093$$libLLVM-10.so.1 + 11
frame #1: 0x00007fffcd69254d libLLVM-10.so.1`llvm::LLVMTargetMachine::addAsmPrinter(llvm::legacy::PassManagerBase&, llvm::raw_pwrite_stream&, llvm::raw_pwrite_stream*, llvm::CodeGenFileType, llvm::MCContext&) + 557
frame #2: 0x00007fffcd69299d libLLVM-10.so.1`llvm::LLVMTargetMachine::addPassesToEmitFile(llvm::legacy::PassManagerBase&, llvm::raw_pwrite_stream&, llvm::raw_pwrite_stream*, llvm::CodeGenFileType, bool, llvm::MachineModuleInfoWrapperPass*) + 221
frame #3: 0x00007fffd4067179 libtvm.so`tvm::codegen::BuildHexagon(tvm::IRModule, tvm::Target)::'lambda0'(llvm::Module const&, tvm::codegen::BuildHexagon(tvm::IRModule, tvm::Target)::CodeGenFileType)::operator()(llvm::Module const&, tvm::codegen::BuildHexagon(tvm::IRModule, tvm::Target)::CodeGenFileType) const + 281
frame #4: 0x00007fffd40686b7 libtvm.so`tvm::codegen::BuildHexagon(tvm::IRModule, tvm::Target) + 4695
frame #5: 0x00007fffd393946d libtvm.so`void tvm::runtime::TypedPackedFunc<tvm::runtime::Module (tvm::IRModule, tvm::Target)>::AssignTypedLambda<tvm::runtime::Module (*)(tvm::IRModule, tvm::Target)>(tvm::runtime::Module (*)(tvm::IRModule, tvm::Target), std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)::'lambda'(tvm::runtime::TVMArgs const&, tvm::runtime::TVMRetValue*)::operator()(tvm::runtime::TVMArgs const&, tvm::runtime::TVMRetValue*) const + 301
frame #6: 0x00007fffd393302c libtvm.so`tvm::codegen::Build(tvm::IRModule, tvm::Target) + 1228
frame #7: 0x00007fffd327ec37 libtvm.so`tvm::build(tvm::runtime::Map<tvm::Target, tvm::IRModule, void, void> const&, tvm::Target const&) + 1863
frame #8: 0x00007fffd3eaf6a7 libtvm.so`tvm::relay::backend::RelayBuildModule::BuildRelay(tvm::IRModule, std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, tvm::runtime::NDArray, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, tvm::runtime::NDArray> > > const&, tvm::runtime::String) + 6999
frame #9: 0x00007fffd3eb0b31 libtvm.so`tvm::relay::backend::RelayBuildModule::GetFunction(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, tvm::runtime::ObjectPtr<tvm::runtime::Object> const&)::'lambda1'(tvm::runtime::TVMArgs, tvm::runtime::TVMRetValue*)::operator()(tvm::runtime::TVMArgs, tvm::runtime::TVMRetValue*) const + 833
frame #10: 0x00007fffd3eb0de7 libtvm.so`std::_Function_handler<void (tvm::runtime::TVMArgs, tvm::runtime::TVMRetValue*), tvm::relay::backend::RelayBuildModule::GetFunction(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, tvm::runtime::ObjectPtr<tvm::runtime::Object> const&)::'lambda1'(tvm::runtime::TVMArgs, tvm::runtime::TVMRetValue*)>::_M_invoke(std::_Any_data const&, tvm::runtime::TVMArgs&&, tvm::runtime::TVMRetValue*&&) + 23
frame #11: 0x00007fffd40cc81b libtvm.so`TVMFuncCall + 91
frame #12: 0x00007fffe90ebbb3 core.cpython-36m-x86_64-linux-gnu.so`::__pyx_f_3tvm_4_ffi_4_cy3_4core_FuncCall(__pyx_v_chandle=0x000000002589af20, __pyx_v_args=0x00007fff5c0c6048, __pyx_v_ret_val=0x00007fffffff7730, __pyx_v_ret_tcode=0x00007fffffff7728) at core.cpp:7603
frame #13: 0x00007fffe90ebf53 core.cpython-36m-x86_64-linux-gnu.so`::__pyx_pw_3tvm_4_ffi_4_cy3_4core_14PackedFuncBase_5__call__(PyObject *, PyObject *, PyObject *) at core.cpp:8387
frame #14: 0x00007fffe90ebf3d core.cpython-36m-x86_64-linux-gnu.so`::__pyx_pw_3tvm_4_ffi_4_cy3_4core_14PackedFuncBase_5__call__(__pyx_v_self=0x00007fff5c0cac78, __pyx_args=0x00007fff5c0c6048, __pyx_kwds=<unavailable>) at core.cpp:8351