[LLDB] `frame variable` crashes when printing a shared_ptr when program uses MSVC STL

[TheRealCringengineer]

LLDB is crashing when im trying to execute frame variable command and there is instance of a class that contains shared_ptr inside of it

Platform: Windows 11 23H2
Compiler that used to build executable: MSVC v19.41

What version of lldb were tested:
lldb v19.0 (installed from visual studio installer)
lldb v20.0 (builded from sources on 17 of december 2024)

Minimal code to reproduce bug

#include <iostream>

class Test
{
public:
  Test(std::shared_ptr<int> v)
      : value(v)
  {}

  std::shared_ptr<int> GetValue() { return value; }

private:
  std::shared_ptr<int> value;
};

int main()
{

  std::unique_ptr<int> test = std::make_unique<int>(25);

  std::cout << "Test " << *test << std::endl;

  Test t(std::make_shared<int>(42));

  std::cout << "Test2 " << *t.GetValue() << std::endl;
}

Actions to reproduce this bug

1. Build executable
2. Attach lldb to it with lldb app.exe
3. Set breakpoint on main
4. run program to hit the breakpoint
5. execute command frame variable
6. expect crash

Stacktrace generated by lldb v20.0 builded from sources

Exception Code: 0xC0000005
 #0 0x00007ff953a9d065 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x29d065)
 #1 0x00007ff953d8ad4e lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x58ad4e)
 #2 0x00007ff953c87964 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x487964)
 #3 0x00007ff953ab3e4b lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2b3e4b)
 #4 0x00007ff953ab44ec lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2b44ec)
 #5 0x00007ff953ab583a lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2b583a)
 #6 0x00007ff953ab3b09 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2b3b09)
 #7 0x00007ff953ab3fba lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2b3fba)
 #8 0x00007ff953ab44ec lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2b44ec)
 #9 0x00007ff953ab583a lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2b583a)
#10 0x00007ff953c77308 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x477308)
#11 0x00007ff955cb80cb lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x24b80cb)
#12 0x00007ff953ae0aee lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2e0aee)
#13 0x00007ff953aed662 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2ed662)
#14 0x00007ff953aef829 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2ef829)
#15 0x00007ff953a90f60 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x290f60)
#16 0x00007ff953a488b9 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2488b9)
#17 0x00007ff953afa519 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2fa519)
#18 0x00007ff953930a74 lldb::SBDebugger::RunCommandInterpreter(bool, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x130a74)
#19 0x00007ff6003d5083 (W:\llvm-project\Release\bin\lldb.exe+0x5083)
#20 0x00007ff6003d921f (W:\llvm-project\Release\bin\lldb.exe+0x921f)
#21 0x00007ff6003fd4ec (W:\llvm-project\Release\bin\lldb.exe+0x2d4ec)
#22 0x00007ffa6c42259d (C:\WINDOWS\System32\KERNEL32.DLL+0x1259d)
#23 0x00007ffa6d34af38 (C:\WINDOWS\SYSTEM32\ntdll.dll+0x5af38)

Stacktrace generated by lldb v19.0.0 (from visual studio installer)

Exception Code: 0xC0000005
 #0 0x00007ff9a4b2547c lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x50547c)
 #1 0x00007ff9a486b95a lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x24b95a)
 #2 0x00007ff9a4881a0b lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x261a0b)
 #3 0x00007ff9a48820a7 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x2620a7)
 #4 0x00007ff9a4883362 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x263362)
 #5 0x00007ff9a488179e lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x26179e)
 #6 0x00007ff9a4881b85 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x261b85)
 #7 0x00007ff9a48820a7 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x2620a7)
 #8 0x00007ff9a4883362 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x263362)
 #9 0x00007ff9a484e3a6 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x22e3a6)
#10 0x00007ff9a67d898f lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x21b898f)
#11 0x00007ff9a48b8dce lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x298dce)
#12 0x00007ff9a48c6a05 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x2a6a05)
#13 0x00007ff9a48c849b lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x2a849b)
#14 0x00007ff9a4861d72 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x241d72)
#15 0x00007ff9a480bed9 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x1ebed9)
#16 0x00007ff9a48d2b1c lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x2b2b1c)
#17 0x00007ff9a471445a lldb::SBDebugger::RunCommandInterpreter(bool, bool) (W:\binary\liblldb.dll+0xf445a)
#18 0x00007ff6eb084568 C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe 0x4568 C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe 0x52a9
#19 0x00007ff6eb084568 C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe 0x2adb4 (C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe+0x4568)
#20 0x00007ff6eb084568
#21 0x00007ff6eb084568 (C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe+0x4568)
0x00007FF9A4B2547C, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x50547C byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0x3538EC byte(s)
0x00007FF9A486B95A, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x24B95A byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0x99DCA byte(s)
0x00007FF9A4881A0B, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x261A0B byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0xAFE7B byte(s)
0x00007FF9A48820A7, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x2620A7 byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0xB0517 byte(s)
0x00007FF9A4883362, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x263362 byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0xB17D2 byte(s)
0x00007FF9A488179E, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x26179E byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0xAFC0E byte(s)
0x00007FF9A4881B85, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x261B85 byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0xAFFF5 byte(s)
0x00007FF9A48820A7, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x2620A7 byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0xB0517 byte(s)
0x00007FF9A4883362, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x263362 byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0xB17D2 byte(s)
0x00007FF9A484E3A6, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x22E3A6 byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0x7C816 byte(s)
0x00007FF9A67D898F, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x21B898F byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0x2006DFF byte(s)
0x00007FF9A48B8DCE, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x298DCE byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0xE723E byte(s)
0x00007FF9A48C6A05, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x2A6A05 byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0xF4E75 byte(s)
0x00007FF9A48C849B, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x2A849B byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0xF690B byte(s)
0x00007FF9A4861D72, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x241D72 byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0x901E2 byte(s)
0x00007FF9A480BED9, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x1EBED9 byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0x3A349 byte(s)
0x00007FF9A48D2B1C, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x2B2B1C byte(s), ?SetShouldSuppress@SBUnixSignals@lldb@@QEAA_NH_N@Z() + 0x100F8C byte(s)
0x00007FF9A471445A, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0xF445A byte(s), ?RunCommandInterpreter@SBDebugger@lldb@@QEAAX_N0@Z() + 0x21A byte(s)
0x00007FF6EB084568, C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe(0x00007FF6EB080000) + 0x4568 byte(s)
0x00007FF6EB0852A9, C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe(0x00007FF6EB080000) + 0x52A9 byte(s)
0x00007FF6EB0AADB4, C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe(0x00007FF6EB080000) + 0x2ADB4 byte(s)
0x00007FFA6C42259D, C:\WINDOWS\System32\KERNEL32.DLL(0x00007FFA6C410000) + 0x1259D byte(s), BaseThreadInitThunk() + 0x1D byte(s)
0x00007FFA6D34AF38, C:\WINDOWS\SYSTEM32\ntdll.dll(0x00007FFA6D2F0000) + 0x5AF38 byte(s), RtlUserThreadStart() + 0x28 byte(s)

There should be diagnostics logs in my Temp folder according to this message

LLDB diagnostics will be written to C:\Users\{USER}\AppData\Local\Temp\diagnostics-897c9d

But diagnostics.log file is competly empty.

[llvmbot]

@llvm/issue-subscribers-lldb

Author: Cringengineer (TheRealCringengineer)

LLDB is crashing when im trying to execute `frame variable` command and there is instance of a class that contains shared_ptr inside of it

Platform: Windows 11 23H2
Compiler that used to build executable: MSVC v19.41

What version of lldb were tested:
lldb v19.0 (installed from visual studio installer)
lldb v20.0 (builded from sources on 17 of december 2024)

Minimal code to reproduce bug

#include <iostream>

class Test
{
public:
  Test(std::shared_ptr<int> v)
      : value(v)
  {}

  std::shared_ptr<int> GetValue() { return value; }

private:
  std::shared_ptr<int> value;
};

int main()
{

  std::unique_ptr<int> test = std::make_unique<int>(25);

  std::cout << "Test " << *test << std::endl;

  Test t(std::make_shared<int>(42));

  std::cout << "Test2 " << *t.GetValue() << std::endl;
}

Actions to reproduce this bug

1. Build executable
2. Attach lldb to it with lldb app.exe
3. Set breakpoint on main
4. run program to hit the breakpoint
5. execute command frame variable
6. expect crash

Stacktrace generated by lldb v20.0 builded from sources

Exception Code: 0xC0000005
 #<!-- -->0 0x00007ff953a9d065 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x29d065)
 #<!-- -->1 0x00007ff953d8ad4e lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x58ad4e)
 #<!-- -->2 0x00007ff953c87964 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x487964)
 #<!-- -->3 0x00007ff953ab3e4b lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2b3e4b)
 #<!-- -->4 0x00007ff953ab44ec lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2b44ec)
 #<!-- -->5 0x00007ff953ab583a lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2b583a)
 #<!-- -->6 0x00007ff953ab3b09 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2b3b09)
 #<!-- -->7 0x00007ff953ab3fba lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2b3fba)
 #<!-- -->8 0x00007ff953ab44ec lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2b44ec)
 #<!-- -->9 0x00007ff953ab583a lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2b583a)
#<!-- -->10 0x00007ff953c77308 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x477308)
#<!-- -->11 0x00007ff955cb80cb lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x24b80cb)
#<!-- -->12 0x00007ff953ae0aee lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2e0aee)
#<!-- -->13 0x00007ff953aed662 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2ed662)
#<!-- -->14 0x00007ff953aef829 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2ef829)
#<!-- -->15 0x00007ff953a90f60 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x290f60)
#<!-- -->16 0x00007ff953a488b9 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2488b9)
#<!-- -->17 0x00007ff953afa519 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x2fa519)
#<!-- -->18 0x00007ff953930a74 lldb::SBDebugger::RunCommandInterpreter(bool, bool) (W:\llvm-project\Release\bin\liblldb.dll+0x130a74)
#<!-- -->19 0x00007ff6003d5083 (W:\llvm-project\Release\bin\lldb.exe+0x5083)
#<!-- -->20 0x00007ff6003d921f (W:\llvm-project\Release\bin\lldb.exe+0x921f)
#<!-- -->21 0x00007ff6003fd4ec (W:\llvm-project\Release\bin\lldb.exe+0x2d4ec)
#<!-- -->22 0x00007ffa6c42259d (C:\WINDOWS\System32\KERNEL32.DLL+0x1259d)
#<!-- -->23 0x00007ffa6d34af38 (C:\WINDOWS\SYSTEM32\ntdll.dll+0x5af38)

Stacktrace generated by lldb v19.0.0 (from visual studio installer)

Exception Code: 0xC0000005
 #<!-- -->0 0x00007ff9a4b2547c lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x50547c)
 #<!-- -->1 0x00007ff9a486b95a lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x24b95a)
 #<!-- -->2 0x00007ff9a4881a0b lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x261a0b)
 #<!-- -->3 0x00007ff9a48820a7 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x2620a7)
 #<!-- -->4 0x00007ff9a4883362 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x263362)
 #<!-- -->5 0x00007ff9a488179e lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x26179e)
 #<!-- -->6 0x00007ff9a4881b85 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x261b85)
 #<!-- -->7 0x00007ff9a48820a7 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x2620a7)
 #<!-- -->8 0x00007ff9a4883362 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x263362)
 #<!-- -->9 0x00007ff9a484e3a6 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x22e3a6)
#<!-- -->10 0x00007ff9a67d898f lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x21b898f)
#<!-- -->11 0x00007ff9a48b8dce lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x298dce)
#<!-- -->12 0x00007ff9a48c6a05 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x2a6a05)
#<!-- -->13 0x00007ff9a48c849b lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x2a849b)
#<!-- -->14 0x00007ff9a4861d72 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x241d72)
#<!-- -->15 0x00007ff9a480bed9 lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x1ebed9)
#<!-- -->16 0x00007ff9a48d2b1c lldb::SBUnixSignals::SetShouldSuppress(int, bool) (W:\binary\liblldb.dll+0x2b2b1c)
#<!-- -->17 0x00007ff9a471445a lldb::SBDebugger::RunCommandInterpreter(bool, bool) (W:\binary\liblldb.dll+0xf445a)
#<!-- -->18 0x00007ff6eb084568 C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe 0x4568 C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe 0x52a9
#<!-- -->19 0x00007ff6eb084568 C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe 0x2adb4 (C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe+0x4568)
#<!-- -->20 0x00007ff6eb084568
#<!-- -->21 0x00007ff6eb084568 (C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe+0x4568)
0x00007FF9A4B2547C, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x50547C byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0x3538EC byte(s)
0x00007FF9A486B95A, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x24B95A byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0x99DCA byte(s)
0x00007FF9A4881A0B, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x261A0B byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0xAFE7B byte(s)
0x00007FF9A48820A7, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x2620A7 byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0xB0517 byte(s)
0x00007FF9A4883362, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x263362 byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0xB17D2 byte(s)
0x00007FF9A488179E, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x26179E byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0xAFC0E byte(s)
0x00007FF9A4881B85, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x261B85 byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0xAFFF5 byte(s)
0x00007FF9A48820A7, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x2620A7 byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0xB0517 byte(s)
0x00007FF9A4883362, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x263362 byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0xB17D2 byte(s)
0x00007FF9A484E3A6, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x22E3A6 byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0x7C816 byte(s)
0x00007FF9A67D898F, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x21B898F byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0x2006DFF byte(s)
0x00007FF9A48B8DCE, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x298DCE byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0xE723E byte(s)
0x00007FF9A48C6A05, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x2A6A05 byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0xF4E75 byte(s)
0x00007FF9A48C849B, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x2A849B byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0xF690B byte(s)
0x00007FF9A4861D72, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x241D72 byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0x901E2 byte(s)
0x00007FF9A480BED9, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x1EBED9 byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0x3A349 byte(s)
0x00007FF9A48D2B1C, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0x2B2B1C byte(s), ?SetShouldSuppress@<!-- -->SBUnixSignals@<!-- -->lldb@@<!-- -->QEAA_NH_N@<!-- -->Z() + 0x100F8C byte(s)
0x00007FF9A471445A, W:\binary\liblldb.dll(0x00007FF9A4620000) + 0xF445A byte(s), ?RunCommandInterpreter@<!-- -->SBDebugger@<!-- -->lldb@@<!-- -->QEAAX_N0@<!-- -->Z() + 0x21A byte(s)
0x00007FF6EB084568, C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe(0x00007FF6EB080000) + 0x4568 byte(s)
0x00007FF6EB0852A9, C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe(0x00007FF6EB080000) + 0x52A9 byte(s)
0x00007FF6EB0AADB4, C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\Llvm\x64\bin\lldb.exe(0x00007FF6EB080000) + 0x2ADB4 byte(s)
0x00007FFA6C42259D, C:\WINDOWS\System32\KERNEL32.DLL(0x00007FFA6C410000) + 0x1259D byte(s), BaseThreadInitThunk() + 0x1D byte(s)
0x00007FFA6D34AF38, C:\WINDOWS\SYSTEM32\ntdll.dll(0x00007FFA6D2F0000) + 0x5AF38 byte(s), RtlUserThreadStart() + 0x28 byte(s)

There should be diagnostics logs in my Temp folder according to this message

LLDB diagnostics will be written to C:\Users\{USER}\AppData\Local\Temp\diagnostics-897c9d

But diagnostics.log file is competly empty.

[DavidSpickett]

I don't have Windows to hand to try there, but I can say that on Linux with a latest clang or gcc 11.4.0 compiled executable, this does not crash:

(lldb) b main
Breakpoint 1: where = test.o`main + 16 at test.cpp:20:53, address = 0x0000000000001224
(lldb) run
Process 1414471 launched: '/tmp/test.o' (aarch64)
Process 1414471 stopped
* thread #1, name = 'test.o', stop reason = breakpoint 1.1
    frame #0: 0x0000aaaaaaaab224 test.o`main at test.cpp:20:53
   17   int main()
   18   {
   19
-> 20     std::unique_ptr<int> test = std::make_unique<int>(25);
   21
   22     std::cout << "Test " << *test << std::endl;
   23
(lldb) frame variable
(std::unique_ptr<int>) test = 0xfffff7b373c0 {
  pointer = 0x0000fffff7b373c0
}
(Test) t = {
  value = nullptr {
    pointer = 0x0000fffffffff3a8
  }
}

So this could be to do with PDB parsing.

Or perhaps we are reading too much from a variable that is not yet initialised, and Windows is more strict about it? You could check that by seeing if there is a point after the entry to main where you can run frame variable successfully. Also I would be interested to know if p test or p t crash too, I expect they do.

Surprised that the callstack is A: not that big and B: claiming to all be in the same function. Could be incomplete unwinding info, or perhaps this is actually accurate and lldb has got into a loop somewhere.

If you are able to build in debug mode (-DCMAKE_BUILD_TYPE=Debug), this would have the best chance of an accurate backtrace.

[TheRealCringengineer]

Checked on the last line in main

 std::cout << "Test2 " << *t.GetValue() << std::endl;

where t.value is 100% initialized. Still crashed

And also

p test

cause crash aswell with the same backtrace

I'll build lldb in debug mode and will return with more info

[TheRealCringengineer]

@DavidSpickett Don't know if it ok to ping you. Sorry in advance

Again diagnostics.log is empty

Here stacktrace from debug version of lldb version 20.0.0

Exception Code: 0xC0000005
 #0 0x00007ff9661528d4 lldb_private::ValueObject::GetSP(void) W:\llvm-project\lldb\include\lldb\ValueObject\ValueObject.h:569:0
 #1 0x00007ff966d468a5 `anonymous namespace'::LibStdcppSharedPtrSyntheticFrontEnd::GetChildAtIndex W:\llvm-project\lldb\source\Plugins\Language\CPlusPlus\LibStdcpp.cpp:386:0
 #2 0x00007ff96699039b lldb_private::ValueObjectSynthetic::GetChildAtIndex(unsigned int, bool) W:\llvm-project\lldb\source\ValueObject\ValueObjectSyntheticFilter.cpp:273:0
 #3 0x00007ff9663b04ed lldb_private::ValueObjectPrinter::GenerateChild(class lldb_private::ValueObject &, unsigned __int64) W:\llvm-project\lldb\source\DataFormatters\ValueObjectPrinter.cpp:710:0
 #4 0x00007ff9663b0e34 lldb_private::ValueObjectPrinter::PrintChildren(bool, bool, struct lldb_private::DumpValueObjectOptions::PointerDepth const &) W:\llvm-project\lldb\source\DataFormatters\ValueObjectPrinter.cpp:730:0
 #5 0x00007ff9663b15f9 lldb_private::ValueObjectPrinter::PrintChildrenIfNeeded(bool, bool) W:\llvm-project\lldb\source\DataFormatters\ValueObjectPrinter.cpp:853:0
 #6 0x00007ff9663ad7a1 lldb_private::ValueObjectPrinter::PrintValueObject(void) W:\llvm-project\lldb\source\DataFormatters\ValueObjectPrinter.cpp:94:0
 #7 0x00007ff9663b0871 lldb_private::ValueObjectPrinter::PrintChild(class std::shared_ptr<class lldb_private::ValueObject>, struct lldb_private::DumpValueObjectOptions::PointerDepth const &) W:\llvm-project\lldb\source\DataFormatters\ValueObjectPrinter.cpp:624:0
 #8 0x00007ff9663b0f42 lldb_private::ValueObjectPrinter::PrintChildren(bool, bool, struct lldb_private::DumpValueObjectOptions::PointerDepth const &) W:\llvm-project\lldb\source\DataFormatters\ValueObjectPrinter.cpp:738:0
 #9 0x00007ff9663b15f9 lldb_private::ValueObjectPrinter::PrintChildrenIfNeeded(bool, bool) W:\llvm-project\lldb\source\DataFormatters\ValueObjectPrinter.cpp:853:0
#10 0x00007ff9663ad7a1 lldb_private::ValueObjectPrinter::PrintValueObject(void) W:\llvm-project\lldb\source\DataFormatters\ValueObjectPrinter.cpp:94:0
#11 0x00007ff96696926b lldb_private::ValueObject::Dump(class lldb_private::Stream &, class lldb_private::DumpValueObjectOptions const &) W:\llvm-project\lldb\source\ValueObject\ValueObject.cpp:2760:0
#12 0x00007ff96c7f478d CommandObjectFrameVariable::DoExecute(class lldb_private::Args &, class lldb_private::CommandReturnObject &) W:\llvm-project\lldb\source\Commands\CommandObjectFrame.cpp:678:0
#13 0x00007ff9664391ef lldb_private::CommandObjectParsed::Execute(char const *, class lldb_private::CommandReturnObject &) W:\llvm-project\lldb\source\Interpreter\CommandObject.cpp:826:0
#14 0x00007ff9664471c7 lldb_private::CommandInterpreter::HandleCommand(char const *, enum lldb_private::LazyBool, class lldb_private::CommandReturnObject &, bool) W:\llvm-project\lldb\source\Interpreter\CommandInterpreter.cpp:2086:0
#15 0x00007ff96645b175 lldb_private::CommandInterpreter::IOHandlerInputComplete(class lldb_private::IOHandler &, class std::basic_string<char, struct std::char_traits<char>, class std::allocator<char>> &) W:\llvm-project\lldb\source\Interpreter\CommandInterpreter.cpp:3179:0
#16 0x00007ff96633a567 lldb_private::IOHandlerEditline::Run(void) W:\llvm-project\lldb\source\Core\IOHandler.cpp:600:0
#17 0x00007ff966210d58 lldb_private::Debugger::RunIOHandlers(void) W:\llvm-project\lldb\source\Core\Debugger.cpp:1140:0
#18 0x00007ff96645820b lldb_private::CommandInterpreter::RunCommandInterpreter(class lldb_private::CommandInterpreterRunOptions &) W:\llvm-project\lldb\source\Interpreter\CommandInterpreter.cpp:3461:0
#19 0x00007ff965fbfe77 lldb::SBDebugger::RunCommandInterpreter(bool, bool) W:\llvm-project\lldb\source\API\SBDebugger.cpp:1259:0
#20 0x00007ff63ea24d74 Driver::MainLoop(void) W:\llvm-project\lldb\tools\driver\Driver.cpp:616:0
#21 0x00007ff63ea27597 main W:\llvm-project\lldb\tools\driver\Driver.cpp:810:0
#22 0x00007ff63ec5e9b9 invoke_main D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:79:0
#23 0x00007ff63ec5e8a2 __scrt_common_main_seh D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288:0
#24 0x00007ff63ec5e75e __scrt_common_main D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:331:0
#25 0x00007ff63ec5ea4e mainCRTStartup D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_main.cpp:17:0
#26 0x00007ffa6c42259d (C:\WINDOWS\System32\KERNEL32.DLL+0x1259d)
#27 0x00007ffa6d34af38 (C:\WINDOWS\SYSTEM32\ntdll.dll+0x5af38)

[DavidSpickett]

Pinging me is fine, I am already subscribed to the issue so GitHub merges it into one notification anyway.

Again diagnostics.log is empty

Yeah to be honest, I'm not sure how you'd end up with content there. You might have to have logging enabled at the time, but anyway it's not a problem here.

Here stacktrace from debug version of lldb version 20.0.0

Brilliant, thank you.

LibStdcppSharedPtrSyntheticFrontEnd is in LLDB's C++ language plugin. So I would guess that it's assuming a member that doesn't exist, or isn't described in the debug info in this case.

It could be that the MSVC version of shared pointer is slightly different. We do test on Windows but we build with clang-cl and there are a few tests disabled, so that could have hidden something.

I'll will get hold of a Windows machine to at least confirm the behaviour (I will likely not have time to look further until early January).

[Michael137]

Which STL are you using? We dont have formatters for MSVC STL, but the formatter matcher regex will think you're using libstdc++. That leads to a crash later down the line

[Michael137]

IIRC this issue got recently reported about and we had some discussion on it

[Michael137]

One workaround is to build against libc++, or just disabling the STL data formatters entirely. Neither is a great solution unfortunately

[TheRealCringengineer]

Which STL are you using?

Since i'm using toolset that comes with visual studio, it should be MSVC STL

[Michael137]

Here's the original issue: #115216