[lldb] No TLS data currently exists for this thread

[alamqadem]

I have a small C program that uses pthread and thread local storage.

static __thread long z = 0xdeadbeef;
static __thread long x = 0xdeadbeef;

// create the function to be executed as a thread
void *thread(void *ptr)
{
    …
}

int main(int argc, char **argv)
{
    …
    pthread_create(&thread1, NULL, *thread, (void *) thr);
    pthread_create(&thread2, NULL, *thread, (void *) thr2);
    …
}

• I compile with the following options -g -O0 -pthread
• when I try to debug it with lldb and print the variables I get the following error:

[amin@lzvmr5 c_example]$ lldb main
(lldb) target create "main"
Current executable set to '/home/amin/bugs/.../c_example/main' (x86_64).
(lldb) b thread
Breakpoint 1: where = main`thread + 12 at main.c:11:22, address = 0x000000000040074c
(lldb) run
Process 3366142 launched: '/home/amin/bugs/.../c_example/main' (x86_64)
Process 3366142 stopped
* thread #2, name = 'main', stop reason = breakpoint 1.1
    frame #0: 0x000000000040074c main`thread(ptr=0x0000000000000001) at main.c:11:22
   8    // create the function to be executed as a thread
   9    void *thread(void *ptr)
   10   {
-> 11       int type = (int) ptr;
   12       printf("%p\n", &z);
   13       printf("%p\n", &x);
   14       fprintf(stderr,"Thread - %d\n",type);
(lldb) p z
error: Couldn't materialize: couldn't get the value of variable z: No TLS data currently exists for this thread.
error: errored out in DoExecute, couldn't PrepareToExecuteJITExpression
(lldb) p x
error: Couldn't materialize: couldn't get the value of variable x: No TLS data currently exists for this thread.
error: errored out in DoExecute, couldn't PrepareToExecuteJITExpression

I can print the variables if I use gdb.

• I use the following versions of clang and lldb:

$ clang -v
clang version 10.0.0-4ubuntu1 
Target: x86_64-pc-linux-gnu
Thread model: posix
...
$ lldb -v
lldb version 10.0.0

Attached you can find the complete reproducer.

c_example.zip

[llvmbot]

@llvm/issue-subscribers-lldb

[peeterjoot]

Trigger for this issue appears to be:

lldb_private::Thread::GetThreadLocalData() calls DynamicLoaderPOSIXDYLD::GetThreadLocalData()

which creates an iterator with:

auto it = m_loaded_modules.find(module_sp);

but

it->second == LLDB_INVALID_ADDRESS.

(gdb) c
Continuing.

Thread 1 "lldb" hit Breakpoint 2, lldb_private::Thread::GetThreadLocalData (this=0x7f35c0027bc0,                                                                                   
    module=std::shared_ptr<lldb_private::Module> (use count 9, weak count 48) = {...}, tls_file_addr=0) at /home/pjoot/chirag/llvm-project/lldb/source/Target/Thread.cpp:1632      
1632      DynamicLoader *loader = GetProcess()->GetDynamicLoader();
(gdb) n
1633      if (loader)
(gdb) n
1635                                          tls_file_addr);
(gdb) s
1634        return loader->GetThreadLocalData(module, shared_from_this(),
(gdb) s
std::enable_shared_from_this<lldb_private::Thread>::shared_from_this (this=0x7f35c0027bd8) at /usr/include/c++/8/bits/shared_ptr.h:655
655           { return shared_ptr<_Tp>(this->_M_weak_this); }
(gdb) finish
Run till exit from #0  std::enable_shared_from_this<lldb_private::Thread>::shared_from_this (this=0x7f35c0027bd8) at /usr/include/c++/8/bits/shared_ptr.h:655
lldb_private::Thread::GetThreadLocalData (this=0x7f35c0027bc0, module=std::shared_ptr<lldb_private::Module> (use count 9, weak count 48) = {...}, tls_file_addr=0)
    at /home/pjoot/chirag/llvm-project/lldb/source/Target/Thread.cpp:1634
1634        return loader->GetThreadLocalData(module, shared_from_this(),
Value returned is $1 = std::shared_ptr<lldb_private::Thread> (use count 10, weak count 5) = {get() = 0x7f35c0027bc0}
(gdb) s
std::shared_ptr<lldb_private::Module>::shared_ptr (this=0x7fff70eaa5d0) at /usr/include/c++/8/bits/shared_ptr.h:129
129           shared_ptr(const shared_ptr&) noexcept = default;
(gdb) finish
Run till exit from #0  std::shared_ptr<lldb_private::Module>::shared_ptr (this=0x7fff70eaa5d0) at /usr/include/c++/8/bits/shared_ptr.h:129
0x00007f3607aff46a in lldb_private::Thread::GetThreadLocalData (this=0x7f35c0027bc0, module=std::shared_ptr<lldb_private::Module> (use count 10, weak count 48) = {...}, 
    tls_file_addr=0) at /home/pjoot/chirag/llvm-project/lldb/source/Target/Thread.cpp:1634
1634        return loader->GetThreadLocalData(module, shared_from_this(),
(gdb) s

Thread 1 "lldb" hit Breakpoint 2, DynamicLoaderPOSIXDYLD::GetThreadLocalData (this=0x2a2cb90, 
    module_sp=std::shared_ptr<lldb_private::Module> (use count 10, weak count 48) = {...}, thread=std::shared_ptr<lldb_private::Thread> (use count 10, weak count 5) = {...}, 
    tls_file_addr=0) at /home/pjoot/chirag/llvm-project/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:691
691       auto it = m_loaded_modules.find(module_sp);
(gdb) n
692       if (it == m_loaded_modules.end())
(gdb) p it
$2 = {first = std::weak_ptr<lldb_private::Module> (use count 10, weak count 48) = {get() = 0x27f8330}, second = 18446744073709551615}
(gdb) n
695       addr_t link_map = it->second;
(gdb) n
696       if (link_map == LLDB_INVALID_ADDRESS)
(gdb) n
697         return LLDB_INVALID_ADDRESS;


(gdb) p *it
$3 = {first = std::weak_ptr<lldb_private::Module> (use count 10, weak count 48) = {get() = 0x27f8330}, second = 18446744073709551615}
(gdb) p /x *it
$4 = {first = std::weak_ptr<lldb_private::Module> (use count 10, weak count 48) = {get() = 0x27f8330}, second = 0xffffffffffffffff}

(gdb) p *module_sp
$6 = {<std::enable_shared_from_this<lldb_private::Module>> = {_M_weak_this = std::weak_ptr<lldb_private::Module> (use count 10, weak count 48) = {
      get() = 0x27f8330}}, <lldb_private::SymbolContextScope> = {_vptr.SymbolContextScope = 0x7f3608ed4f30 <vtable for lldb_private::Module+16>}, 
  m_mutex = {<std::__recursive_mutex_base> = {_M_mutex = {__data = {__lock = 0, __count = 0, __owner = 0, __nusers = 0, __kind = 1, __spins = 0, __elision = 0, __list = {
            __prev = 0x0, __next = 0x0}}, __size = '\000' <repeats 16 times>, "\001", '\000' <repeats 22 times>, __align = 0}}, <No data fields>}, m_mod_time = {__d = {
      __r = 1658753820460639357}}, m_arch = {m_triple = {Data = "x86_64--linux", Arch = llvm::Triple::x86_64, SubArch = llvm::Triple::NoSubArch, 
      Vendor = llvm::Triple::UnknownVendor, OS = llvm::Triple::Linux, Environment = llvm::Triple::UnknownEnvironment, ObjectFormat = llvm::Triple::ELF}, 
    m_core = lldb_private::ArchSpec::eCore_x86_64_x86_64, m_byte_order = lldb::eByteOrderLittle, m_flags = 0, m_distribution_id = {m_string = 0x0}}, m_uuid = {
    m_bytes = {<llvm::SmallVectorImpl<unsigned char>> = {<llvm::SmallVectorTemplateBase<unsigned char, true>> = {<llvm::SmallVectorTemplateCommon<unsigned char, void>> = {<llvm::SmallVectorBase<unsigned long>> = {BeginX = 0x27f83e0, Size = 20, Capacity = 20}, <No data fields>}, 
          static TakesParamByValue = true}, <No data fields>}, <llvm::SmallVectorStorage<unsigned char, 20>> = {
        InlineElts = "\373\244\257\271;hi\250\201\205\327A\306\036\334\030\310\\\223\262"}, <No data fields>}}, m_file = {m_directory = {
      m_string = 0x28a1bd0 "/home/pjoot/chirag/llvm.55658/c_example"}, m_filename = {m_string = 0x25eebf0 "main"}, m_is_resolved = false, 
    m_style = llvm::sys::path::Style::posix}, m_platform_file = {m_directory = {m_string = 0x0}, m_filename = {m_string = 0x0}, m_is_resolved = false, 
    m_style = llvm::sys::path::Style::posix}, m_remote_install_file = {m_directory = {m_string = 0x0}, m_filename = {m_string = 0x0}, m_is_resolved = false, 
    m_style = llvm::sys::path::Style::posix}, m_symfile_spec = {m_directory = {m_string = 0x0}, m_filename = {m_string = 0x0}, m_is_resolved = false, 
    m_style = llvm::sys::path::Style::posix}, m_object_name = {m_string = 0x0}, m_object_offset = 0, m_object_mod_time = {__d = {__r = 0}}, 
  m_data_sp = std::shared_ptr<lldb_private::DataBuffer> (empty) = {get() = 0x0}, m_objfile_sp = std::shared_ptr<lldb_private::ObjectFile> (use count 2, weak count 1) = {
    get() = 0x28a2ee0}, m_unwind_table = {Storage = {{empty = 48 '0', value = {m_module = @0x27f8330, m_unwinds = std::map with 1 element = {
            [4196118] = std::shared_ptr<lldb_private::FuncUnwinders> (use count 1, weak count 0) = {get() = 0x7f35c0009750}}, m_initialized = true, 
          m_mutex = {<std::__mutex_base> = {_M_mutex = {__data = {__lock = 0, __count = 0, __owner = 0, __nusers = 0, __kind = 0, __spins = 0, __elision = 0, __list = {
                    __prev = 0x0, __next = 0x0}}, __size = '\000' <repeats 39 times>, __align = 0}}, <No data fields>}, 
          m_object_file_unwind_up = std::unique_ptr<lldb_private::CallFrameInfo> = {get() = 0x0}, m_eh_frame_up = std::unique_ptr<lldb_private::DWARFCallFrameInfo> = {
            get() = 0x27f5750}, m_debug_frame_up = std::unique_ptr<lldb_private::DWARFCallFrameInfo> = {get() = 0x0}, 
          m_compact_unwind_up = std::unique_ptr<lldb_private::CompactUnwindInfo> = {get() = 0x0}, m_arm_unwind_up = std::unique_ptr<lldb_private::ArmUnwindInfo> = {
            get() = 0x0}}}, hasVal = true}}, m_symfile_up = std::unique_ptr<lldb_private::SymbolVendor> = {get() = 0x28b2f60}, 
  m_old_symfiles = std::vector of length 0, capacity 0, m_type_system_map = {m_mutex = {<std::__mutex_base> = {_M_mutex = {__data = {__lock = 0, __count = 0, __owner = 0, 
            __nusers = 0, __kind = 0, __spins = 0, __elision = 0, __list = {__prev = 0x0, __next = 0x0}}, __size = '\000' <repeats 39 times>, __align = 0}}, <No data fields>}, 
    m_map = std::map with 2 elements = {[lldb::eLanguageTypeC] = std::shared_ptr<lldb_private::TypeSystem> (use count 2, weak count 0) = {get() = 0x28a0340}, 
      [lldb::eLanguageTypeC99] = std::shared_ptr<lldb_private::TypeSystem> (use count 2, weak count 0) = {get() = 0x28a0340}}, m_clear_in_progress = false}, m_source_mappings = {
    m_pairs = std::vector of length 0, capacity 0, m_callback = 0x0, m_callback_baton = 0x0, m_mod_id = 0}, m_sections_up = std::unique_ptr<lldb_private::SectionList> = {
    get() = 0x28b2980}, m_did_load_objfile = {_M_base = {static _S_alignment = 1, _M_i = true}}, m_did_load_symfile = {_M_base = {static _S_alignment = 1, _M_i = true}}, 
  m_did_set_uuid = {_M_base = {static _S_alignment = 1, _M_i = true}}, m_file_has_changed = false, m_first_file_changed_log = false, m_symtab_parse_time = {
    value = {<std::__atomic_base<unsigned long>> = {static _S_alignment = 8, _M_i = 5898}, <No data fields>}}, m_symtab_index_time = {
    value = {<std::__atomic_base<unsigned long>> = {static _S_alignment = 8, _M_i = 2327}, <No data fields>}}}


(gdb) bt
#0  DynamicLoaderPOSIXDYLD::GetThreadLocalData (this=0x2a2cb90, module_sp=std::shared_ptr<lldb_private::Module> (use count 10, weak count 48) = {...},                             
    thread=std::shared_ptr<lldb_private::Thread> (use count 10, weak count 5) = {...}, tls_file_addr=0)                                                                            
    at /home/pjoot/chirag/llvm-project/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:697                                                                 
#1  0x00007f3607aff47f in lldb_private::Thread::GetThreadLocalData (this=0x7f35c0027bc0, module=std::shared_ptr<lldb_private::Module> (use count 10, weak count 48) = {...},       
    tls_file_addr=0) at /home/pjoot/chirag/llvm-project/lldb/source/Target/Thread.cpp:1634                                                                                         
#2  0x00007f36078d2627 in lldb_private::DWARFExpression::Evaluate (exe_ctx=0x7fff70eac9d0, reg_ctx=0x7f35c002d0c0,                                                                 
    module_sp=std::shared_ptr<lldb_private::Module> (use count 10, weak count 48) = {...}, opcodes=..., dwarf_cu=0x28c9800, reg_kind=lldb::eRegisterKindDWARF,                     
    initial_value_ptr=0x0, object_address_ptr=0x0, result=..., error_ptr=0x2bae898) at /home/pjoot/chirag/llvm-project/lldb/source/Expression/DWARFExpression.cpp:2565             
#3  0x00007f36078ccb77 in lldb_private::DWARFExpression::Evaluate (this=0x2a0be48, exe_ctx=0x7fff70eac9d0, reg_ctx=0x0, func_load_addr=18446744073709551615,                       
    initial_value_ptr=0x0, object_address_ptr=0x0, result=..., error_ptr=0x2bae898) at /home/pjoot/chirag/llvm-project/lldb/source/Expression/DWARFExpression.cpp:893              
#4  0x00007f36078932a7 in lldb_private::ValueObjectVariable::UpdateValue (this=0x2bae740) at /home/pjoot/chirag/llvm-project/lldb/source/Core/ValueObjectVariable.cpp:163          
#5  0x00007f3607871fd0 in lldb_private::ValueObject::UpdateValueIfNeeded (this=0x2bae740, update_format=false)                                                                     
    at /home/pjoot/chirag/llvm-project/lldb/source/Core/ValueObject.cpp:168
#6  0x00007f36078726b5 in lldb_private::ValueObject::GetError (this=0x2bae740) at /home/pjoot/chirag/llvm-project/lldb/source/Core/ValueObject.cpp:284                             
#7  0x00007f360833b7f4 in EntityVariable::Materialize (this=0x283e540, frame_sp=std::shared_ptr<lldb_private::StackFrame> (use count 8, weak count 1) = {...}, map=...,            
    process_address=140737354088448, err=...) at /home/pjoot/chirag/llvm-project/lldb/source/Expression/Materializer.cpp:453                                                       
#8  0x00007f36083394a4 in lldb_private::Materializer::Materialize (this=0x2a11d10, frame_sp=std::shared_ptr<lldb_private::StackFrame> (use count 8, weak count 1) = {...},         
    map=..., process_address=140737354088448, error=...) at /home/pjoot/chirag/llvm-project/lldb/source/Expression/Materializer.cpp:1374                                           
#9  0x00007f36083383b4 in lldb_private::LLVMUserExpression::PrepareToExecuteJITExpression (this=0x2a64d50, diagnostic_manager=..., exe_ctx=...,                                    
    struct_address=@0x7fff70ead310: 140737354088448) at /home/pjoot/chirag/llvm-project/lldb/source/Expression/LLVMUserExpression.cpp:358                                          
#10 0x00007f360833740a in lldb_private::LLVMUserExpression::DoExecute (this=0x2a64d50, diagnostic_manager=..., exe_ctx=..., options=...,                                           
    shared_ptr_to_me=std::shared_ptr<lldb_private::UserExpression> (use count 1, weak count 0) = {...}, result=std::shared_ptr<lldb_private::ExpressionVariable> (empty) = {...})  
    at /home/pjoot/chirag/llvm-project/lldb/source/Expression/LLVMUserExpression.cpp:82
#11 0x00007f36078df589 in lldb_private::UserExpression::Execute (this=0x2a64d50, diagnostic_manager=..., exe_ctx=..., options=...,                                                 
    shared_ptr_to_me=std::shared_ptr<lldb_private::UserExpression> (use count 1, weak count 0) = {...},                                                                            
    result_var=std::shared_ptr<lldb_private::ExpressionVariable> (empty) = {...}) at /home/pjoot/chirag/llvm-project/lldb/source/Expression/UserExpression.cpp:396                 
#12 0x00007f36078df151 in lldb_private::UserExpression::Evaluate (exe_ctx=..., options=..., expr=..., prefix=...,                                                                  
    result_valobj_sp=std::shared_ptr<lldb_private::ValueObject> (empty) = {...}, error=..., fixed_expression=0x27755b8, ctx_obj=0x0)                                               
    at /home/pjoot/chirag/llvm-project/lldb/source/Expression/UserExpression.cpp:343
#13 0x00007f3607ad2dbd in lldb_private::Target::EvaluateExpression (this=0x28b1c10, expr=..., exe_scope=0x7f35c003fbc0,                                                            
    result_valobj_sp=std::shared_ptr<lldb_private::ValueObject> (empty) = {...}, options=..., fixed_expression=0x27755b8, ctx_obj=0x0)                                             
    at /home/pjoot/chirag/llvm-project/lldb/source/Target/Target.cpp:2496
#14 0x00007f36080fda65 in lldb_private::CommandObjectExpression::EvaluateExpression (this=0x27750e0, expr=..., output_stream=..., error_stream=..., result=...)                    
    at /home/pjoot/chirag/llvm-project/lldb/source/Commands/CommandObjectExpression.cpp:418                                                                                        
#15 0x00007f36080fea18 in lldb_private::CommandObjectExpression::DoExecute (this=0x27750e0, command=..., result=...)                                                               
    at /home/pjoot/chirag/llvm-project/lldb/source/Commands/CommandObjectExpression.cpp:645                                                                                        
#16 0x00007f360796762b in lldb_private::CommandObjectRaw::Execute (this=0x27750e0, args_string=0x7fff70eae1e0 "-- z", result=...)                                                  
    at /home/pjoot/chirag/llvm-project/lldb/source/Interpreter/CommandObject.cpp:1020
#17 0x00007f3607941dac in lldb_private::CommandInterpreter::HandleCommand (this=0x28e8500, command_line=0x7fff70eae790 "p z",                                                      
    lazy_add_to_history=lldb_private::eLazyBoolCalculate, result=...) at /home/pjoot/chirag/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:1971                       
#18 0x00007f3607946560 in lldb_private::CommandInterpreter::IOHandlerInputComplete (this=0x28e8500, io_handler=..., line="p z")                                                    
    at /home/pjoot/chirag/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:3023                                                                                         
#19 0x00007f3607816161 in lldb_private::IOHandlerEditline::Run (this=0x2997520) at /home/pjoot/chirag/llvm-project/lldb/source/Core/IOHandler.cpp:576                              
#20 0x00007f36077d5b0b in lldb_private::Debugger::RunIOHandlers (this=0x264c7f0) at /home/pjoot/chirag/llvm-project/lldb/source/Core/Debugger.cpp:981                              
#21 0x00007f3607947768 in lldb_private::CommandInterpreter::RunCommandInterpreter (this=0x28e8500, options=...)                                                                    
    at /home/pjoot/chirag/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:3269                                                                                         
#22 0x00007f36075926a8 in lldb::SBDebugger::RunCommandInterpreter (this=0x7fff70eaec80, auto_handle_events=true, spawn_thread=false)                                               
    at /home/pjoot/chirag/llvm-project/lldb/source/API/SBDebugger.cpp:1166

Line numbers in this debug session correspond to llvm-project commit f28c006 (14.0.6)

[peeterjoot]

It appears that m_loaded_modules is a std::map

691       auto it = m_loaded_modules.find(module_sp);
(gdb) s
std::map<std::weak_ptr<lldb_private::Module>, unsigned long, std::owner_less<std::weak_ptr<lldb_private::Module> >, std::allocator<std::pair<std::weak_ptr<lldb_private::Module> const, unsigned long> > >::find (this=0x2a2cce0, __x=std::weak_ptr<lldb_private::Module> (use count 10, weak count 49) = {...}) at /usr/include/c++/8/bits/stl_map.h:1169
1169          { return _M_t.find(__x); }

I see a few places where m_loaded_modules is assigned to:

void DynamicLoaderPOSIXDYLD::UpdateLoadedSections(ModuleSP module,
                                                  addr_t link_map_addr,
                                                  addr_t base_addr,
                                                  bool base_addr_is_offset) {
  m_loaded_modules[module] = link_map_addr;
  UpdateLoadedSectionsCommon(module, base_addr, base_addr_is_offset);
}

void DynamicLoaderPOSIXDYLD::LoadAllCurrentModules() {
  DYLDRendezvous::iterator I;
  DYLDRendezvous::iterator E;
  ModuleList module_list;
  Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));

  LoadVDSO();
...
  ModuleSP executable = GetTargetExecutable();
  m_loaded_modules[executable] = m_rendezvous.GetLinkMapAddress();

I see some -1 insertions from UpdateLoadedSections() early in the lldb start up:

Thread 1 "lldb" hit Breakpoint 3, DynamicLoaderPOSIXDYLD::UpdateLoadedSections (this=0x296cab0, module=std::shared_ptr<lldb_private::Module> (use count 6, weak count 43) = {...}, 
    link_map_addr=18446744073709551615, base_addr=0, base_addr_is_offset=true)
    at /home/pjoot/chirag/llvm-project/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:206                                                                 
206       m_loaded_modules[module] = link_map_addr;
(gdb) p link_map_addr
$1 = 18446744073709551615
(gdb) p /x link_map_addr
$2 = 0xffffffffffffffff
(gdb) bt
#0  DynamicLoaderPOSIXDYLD::UpdateLoadedSections (this=0x296cab0, module=std::shared_ptr<lldb_private::Module> (use count 6, weak count 43) = {...}, 
    link_map_addr=18446744073709551615, base_addr=0, base_addr_is_offset=true)
    at /home/pjoot/chirag/llvm-project/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:206
#1  0x00007f1e53dad23e in DynamicLoaderPOSIXDYLD::DidLaunch (this=0x296cab0)
    at /home/pjoot/chirag/llvm-project/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:184
#2  0x00007f1e53c02b26 in lldb_private::Process::Launch (this=0x294d940, launch_info=...) at /home/pjoot/chirag/llvm-project/lldb/source/Target/Process.cpp:2519
#3  0x00007f1e5423953e in PlatformPOSIX::DebugProcess (this=0x2488b20, launch_info=..., debugger=..., target=..., error=...)
    at /home/pjoot/chirag/llvm-project/lldb/source/Plugins/Platform/POSIX/PlatformPOSIX.cpp:480
#4  0x00007f1e53c711fe in lldb_private::Target::Launch (this=0x27efc10, launch_info=..., stream=0x7fff6da4f280)
    at /home/pjoot/chirag/llvm-project/lldb/source/Target/Target.cpp:3046
#5  0x00007f1e542c5eb5 in CommandObjectProcessLaunch::DoExecute (this=0x26c0a60, launch_args=..., result=...)
    at /home/pjoot/chirag/llvm-project/lldb/source/Commands/CommandObjectProcess.cpp:249
#6  0x00007f1e53b034d2 in lldb_private::CommandObjectParsed::Execute (this=0x26c0a60, args_string=0x7fff6da4f5f0 "-c/bin/bash --", result=...)
    at /home/pjoot/chirag/llvm-project/lldb/source/Interpreter/CommandObject.cpp:998
#7  0x00007f1e53adddac in lldb_private::CommandInterpreter::HandleCommand (this=0x2826500, command_line=0x7fff6da4fba0 "run", 
    lazy_add_to_history=lldb_private::eLazyBoolCalculate, result=...) at /home/pjoot/chirag/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:1971
#8  0x00007f1e53ae2560 in lldb_private::CommandInterpreter::IOHandlerInputComplete (this=0x2826500, io_handler=..., line="run")
    at /home/pjoot/chirag/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:3023
#9  0x00007f1e539b2161 in lldb_private::IOHandlerEditline::Run (this=0x2734a90) at /home/pjoot/chirag/llvm-project/lldb/source/Core/IOHandler.cpp:576
#10 0x00007f1e53971cbc in lldb_private::Debugger::RunIOHandlerSync (this=0x258a7f0, reader_sp=std::shared_ptr<lldb_private::IOHandler> (use count 3, weak count 0) = {...})
    at /home/pjoot/chirag/llvm-project/lldb/source/Core/Debugger.cpp:1010
#11 0x00007f1e53ae10d6 in lldb_private::CommandInterpreter::HandleCommandsFromFile (this=0x2826500, cmd_file=..., options=..., result=...)
    at /home/pjoot/chirag/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:2723
#12 0x00007f1e5428b09f in CommandObjectCommandsSource::DoExecute (this=0x27c5590, command=..., result=...)
    at /home/pjoot/chirag/llvm-project/lldb/source/Commands/CommandObjectCommands.cpp:187
#13 0x00007f1e53b034d2 in lldb_private::CommandObjectParsed::Execute (this=0x27c5590, args_string=0x7fff6da50020 "b2", result=...)
    at /home/pjoot/chirag/llvm-project/lldb/source/Interpreter/CommandObject.cpp:998
#14 0x00007f1e53adddac in lldb_private::CommandInterpreter::HandleCommand (this=0x2826500, command_line=0x28f71c0 "command source b2", 
    lazy_add_to_history=lldb_private::eLazyBoolCalculate, result=...) at /home/pjoot/chirag/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:1971
#15 0x00007f1e53ae2560 in lldb_private::CommandInterpreter::IOHandlerInputComplete (this=0x2826500, io_handler=..., line="command source b2")
    at /home/pjoot/chirag/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:3023
#16 0x00007f1e539b2161 in lldb_private::IOHandlerEditline::Run (this=0x28d5520) at /home/pjoot/chirag/llvm-project/lldb/source/Core/IOHandler.cpp:576
#17 0x00007f1e53971b0b in lldb_private::Debugger::RunIOHandlers (this=0x258a7f0) at /home/pjoot/chirag/llvm-project/lldb/source/Core/Debugger.cpp:981
#18 0x00007f1e53ae3768 in lldb_private::CommandInterpreter::RunCommandInterpreter (this=0x2826500, options=...)
    at /home/pjoot/chirag/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:3269
#19 0x00007f1e5372e6a8 in lldb::SBDebugger::RunCommandInterpreter (this=0x7fff6da50ac0, auto_handle_events=true, spawn_thread=false)
    at /home/pjoot/chirag/llvm-project/lldb/source/API/SBDebugger.cpp:1166
#20 0x0000000000409ece in Driver::MainLoop (this=0x7fff6da50aa0) at /home/pjoot/chirag/llvm-project/lldb/tools/driver/Driver.cpp:626
#21 0x000000000040a99b in main (argc=2, argv=0x7fff6da51058) at /home/pjoot/chirag/llvm-project/lldb/tools/driver/Driver.cpp:845
(gdb) c
Continuing.

Thread 1 "lldb" hit Breakpoint 3, DynamicLoaderPOSIXDYLD::UpdateLoadedSections (this=0x296cab0, module=std::shared_ptr<lldb_private::Module> (use count 4, weak count 34) = {...}, 
    link_map_addr=18446744073709551615, base_addr=140737351843840, base_addr_is_offset=false)
    at /home/pjoot/chirag/llvm-project/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:206
206       m_loaded_modules[module] = link_map_addr;
(gdb) p link_map_addr
$3 = 18446744073709551615
(gdb) c
Continuing.

Thread 1 "lldb" hit Breakpoint 3, DynamicLoaderPOSIXDYLD::UpdateLoadedSections (this=0x296cab0, module=std::shared_ptr<lldb_private::Module> (use count 2, weak count 2) = {...}, 
    link_map_addr=18446744073709551615, base_addr=140737354113024, base_addr_is_offset=false)
    at /home/pjoot/chirag/llvm-project/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:206
206       m_loaded_modules[module] = link_map_addr;
(gdb) p link_map_addr
$4 = 18446744073709551615
(gdb) c
Continuing.
[New Thread 0x7f1e21004700 (LWP 670589)]
[New Thread 0x7f1e20803700 (LWP 670590)]
[Switching to Thread 0x7f1e21004700 (LWP 670589)]

Thread 6 "intern-state" hit Breakpoint 3, DynamicLoaderPOSIXDYLD::UpdateLoadedSections (this=0x296cab0, 
    module=std::shared_ptr<lldb_private::Module> (use count 4, weak count 34) = {...}, link_map_addr=140737354127880, base_addr=140737351843840, base_addr_is_offset=true)
    at /home/pjoot/chirag/llvm-project/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:206
206       m_loaded_modules[module] = link_map_addr;
(gdb) p link_map_addr
$5 = 140737354127880
(gdb) c
Continuing.

Thread 6 "intern-state" hit Breakpoint 3, DynamicLoaderPOSIXDYLD::UpdateLoadedSections (this=0x296cab0, 
    module=std::shared_ptr<lldb_private::Module> (use count 3, weak count 20) = {...}, link_map_addr=140737354131328, base_addr=140737354113024, base_addr_is_offset=false)
    at /home/pjoot/chirag/llvm-project/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:206
206       m_loaded_modules[module] = link_map_addr;

but there are some non- minus-1 insertions in that codepath too. I see no calls to LoadAllCurrentModules(). Should there be one, or should one of the addresses set in the various UpdateLoadedSections() calls have been a non minus-1 value?

[xingyu0618]

This bug still exists.
lldb version 15.0.7
arch linux

[peeterjoot]

We have a fix for it, currently tested on llvm 14.0.6. We will forward fit to master and submit.

[xingyu0618]

Thanks for your reply.
You said it was fixed on version 14.0.6, but on version 15.0.7, it still exists.

[peeterjoot]

Fixed in our branch of 14.0.6, not pushed to the llvm-project.

[xingyu0618]

OK, I will try to build this version. Thanks.
BTW, why not push the fix to master branch?

[peeterjoot]

Why: because llvm is volatile. It will mostly take work to merge it to a master based branch.

[xingyu0618]

I built the version you suggested, the problem still exists.
Did I miss something?

[peeterjoot]

I'm saying that we have a fork of llvm-project 14.0.6, which is not currently available anywhere outside of our organization.

[obfuscated]

We have a fix for it, currently tested on llvm 14.0.6. We will forward fit to master and submit.

I'm saying that we have a fork of llvm-project 14.0.6, which is not currently available anywhere outside of our organization.

@peeterjoot
Are you still planning to upstream the fix? If not it is probably a good idea to state so.