Black Magic Probe creates phantom second inferior/thread on continue, breaking debugging

[twhiston]

When debugging with Black Magic Probe using servertype: "external", the first -exec-continue command causes GDB to report a new inferior (i2 with pid 42000), which cortex-debug interprets as a second thread. This phantom Thread 2 has no symbols (func="??") and breaks debugging:

• Step-over fails with "Cannot find bounds of current function"
• The debugger switches to this second Thread 1 (it is shown as Thread 1 in the UI) on breakpoint hits
• Thread 2 shows the same address as Thread 1 but without symbol resolution

When using BMP with target extended-remote, GDB's async mode (mi-async on, which cortex-debug enables) causes GDB to emit =thread-group-added,id="i2" notifications on continue. This appears to be a quirk of how BMP reports breakpoint hits in extended-remote mode.

Debug Log Highlights (might not exactly match the output pasted further down, I ran it again to generate that as I'd not previously saved the full logs):

Initial attach works correctly with 1 thread:
16-interpreter-exec console "attach 1"
-> =thread-group-started,id="i1",pid="1"
-> =thread-created,id="1",group-id="i1"
...
24-thread-list-ids
-> 24^done,thread-ids={thread-id="1"},current-thread-id="1",number-of-threads="1"

After first continue, phantom inferior appears:
29-exec-continue --thread 1
-> 29^running
-> *running,thread-id="all"
-> =thread-group-added,id="i2"
-> ~"[New inferior 2]\n"
-> =thread-group-started,id="i2",pid="42000"
-> &"warning: No executable has been specified and target does not support\ndetermining executable automatically. Try using the "file" command."
-> =thread-created,id="2",group-id="i2"
-> ~"[New Thread 1]\n"
-> *stopped,reason="signal-received",signal-name="SIGTRAP",...,thread-id="2",stopped-threads="all"
Now cortex-debug shows 2 threads, with Thread 2 having no symbols:
30-thread-list-ids
-> 30^done,thread-ids={thread-id="1",thread-id="2"},current-thread-id="2",number-of-threads="2"

Thread 1: func="main", has symbols ✓
Thread 2: func="??", no symbols ✗

What I've tried (none work):

• set print inferior-events off
• set detach-on-fork on
• set schedule-multiple off
• remove-inferiors 2 in postAttachCommands (phantom appears after continue, not attach)
• rtos: "none" (not supported with external servertype)
• Native servertype: "bmp" - same issue
• Various debuggerArgs to set mi-async off - can't change after connection

Note: PlatformIO's debugger works correctly with the same BMP and target. Their debug adapter appears to filter out or ignore these phantom inferior notifications.

It would be great if there was a way to work around this. eg:

• Having an option to ignore thread-group-added notifications for inferiors beyond the primary one
• or for BMP servertype, automatically filter out phantom inferiors
• or provide an overrideContinueCommands option so users can work around this

launch.json:

{
  "name": "Black Magic Probe (Attach)",
  "type": "cortex-debug",
  "request": "attach",
  "cwd": "${workspaceFolder}",
  "executable": "${workspaceFolder}/build/zephyr/zephyr.elf",
  "servertype": "external",
  "gdbTarget": "/dev/cu.usbmodem98B6A4C21",
  "gdbPath": "/path/to/arm-zephyr-eabi-gdb",
  "overrideAttachCommands": [
    "set confirm off",
    "set pagination off",
    "target extended-remote /dev/cu.usbmodem98B6A4C21",
    "set mem inaccessible-by-default off",
    "monitor swdp_scan",
    "attach 1",
    "set mem inaccessible-by-default on",
    "set remote hardware-breakpoint-limit 6",
    "set remote hardware-watchpoint-limit 4"
  ]
}

Screenshots

Environment:

• Cortex-Debug Version: 1.12.1
• OS: macOS Sequoia 15.7.1 (Darwin 24.6.0)
• GDB Version: arm-zephyr-eabi-gdb 12.1 (Zephyr SDK 0.17.4)
• Compiler Toolchain Version: arm-zephyr-eabi 0.17.4
• Target: NXP i.MXRT1062 (Cortex-M7)
• Debug probe: Black Magic Probe

Attach text from Debug Console

Cortex-Debug: VSCode debugger extension version 1.12.1 git(652d042). Usage info: https://github.com/Marus/cortex-debug#usage
"configuration": {
    "name": "Black Magic Probe (Attach)",
    "type": "cortex-debug",
    "request": "attach",
    "cwd": "/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest",
    "executable": "/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/build/primary/zephyr/zephyr.elf",
    "servertype": "external",
    "gdbTarget": "/dev/cu.usbmodem98B6A4C21",
    "showDevDebugOutput": "both",
    "gdbPath": "/Users/twhiston/zephyr-sdk-0.17.4/arm-zephyr-eabi/bin/arm-zephyr-eabi-gdb",
    "swoConfig": {
        "enabled": false,
        "source": "probe",
        "decoders": []
    },
    "overrideAttachCommands": [
        "set confirm off",
        "set pagination off",
        "target extended-remote /dev/cu.usbmodem98B6A4C21",
        "set mem inaccessible-by-default off",
        "monitor swdp_scan",
        "attach 1",
        "set print inferior-events off",
        "set mem inaccessible-by-default on",
        "set remote hardware-breakpoint-limit 6",
        "set remote hardware-watchpoint-limit 4"
    ],
    "postAttachCommands": [
        "set print inferior-events off"
    ],
    "__configurationTarget": 6,
    "gdbServerConsolePort": 55878,
    "pvtAvoidPorts": [],
    "chainedConfigurations": {
        "enabled": false
    },
    "debuggerArgs": [],
    "rttConfig": {
        "enabled": false,
        "decoders": []
    },
    "graphConfig": [],
    "preLaunchCommands": [],
    "postLaunchCommands": [],
    "preAttachCommands": [],
    "preRestartCommands": [],
    "postRestartCommands": [],
    "preResetCommands": [],
    "postResetCommands": [],
    "toolchainPrefix": "arm-none-eabi",
    "extensionPath": "/Users/twhiston/.vscode/extensions/marus25.cortex-debug-1.12.1",
    "registerUseNaturalFormat": true,
    "variableUseNaturalFormat": true,
    "pvtVersion": "1.12.1",
    "__sessionId": "9f2717d4-d175-410d-92f8-598015301fee",
    "pvtShowDevDebugOutput": "both"
}
Reading symbols from /Users/twhiston/zephyr-sdk-0.17.4/arm-zephyr-eabi/bin/arm-zephyr-eabi-objdump --syms -C -h -w /Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/build/primary/zephyr/zephyr.elf
Reading symbols from /Users/twhiston/zephyr-sdk-0.17.4/arm-zephyr-eabi/bin/arm-zephyr-eabi-nm --defined-only -S -l -C -p /Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/build/primary/zephyr/zephyr.elf
Launching GDB: /Users/twhiston/zephyr-sdk-0.17.4/arm-zephyr-eabi/bin/arm-zephyr-eabi-gdb -q --interpreter=mi2
1-gdb-version
Finished reading symbols from objdump: Time: 25 ms
Finished reading symbols from nm: Time: 36 ms
-> =thread-group-added,id="i1"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"thread-group-added","output":[["id","i1"]]}]}
-> ~"GNU gdb (Zephyr SDK 0.17.4) 12.1\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"GNU gdb (Zephyr SDK 0.17.4) 12.1\n"}]}
-> ~"Copyright (C) 2022 Free Software Foundation, Inc.\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"Copyright (C) 2022 Free Software Foundation, Inc.\n"}]}
-> ~"License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\nThis is free software: you are free to change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by law."
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\nThis is free software: you are free to change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by law."}]}
-> ~"\nType \"show copying\" and \"show warranty\" for details.\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"\nType \"show copying\" and \"show warranty\" for details.\n"}]}
-> ~"This GDB was configured as \"--host=aarch64-build_apple-darwin23.6.0 --target=arm-zephyr-eabi\".\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"This GDB was configured as \"--host=aarch64-build_apple-darwin23.6.0 --target=arm-zephyr-eabi\".\n"}]}
-> ~"Type \"show configuration\" for configuration details.\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"Type \"show configuration\" for configuration details.\n"}]}
-> ~"For bug reporting instructions, please see:\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"For bug reporting instructions, please see:\n"}]}
-> ~"<https://github.com/zephyrproject-rtos/sdk-ng/issues>.\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"<https://github.com/zephyrproject-rtos/sdk-ng/issues>.\n"}]}
-> ~"Find the GDB manual and other documentation resources online at:\n    <http://www.gnu.org/software/gdb/documentation/>."
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"Find the GDB manual and other documentation resources online at:\n    <http://www.gnu.org/software/gdb/documentation/>."}]}
-> ~"\n\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"\n\n"}]}
-> ~"For help, type \"help\".\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"For help, type \"help\".\n"}]}
-> ~"Type \"apropos word\" to search for commands related to \"word\".\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"Type \"apropos word\" to search for commands related to \"word\".\n"}]}
-> 1^done
GDB -> App: {"output":"","token":1,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
2-gdb-set mi-async on
-> 2^done
GDB -> App: {"output":"","token":2,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
3-interpreter-exec console "set print demangle on"
-> 3^done
GDB -> App: {"output":"","token":3,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
4-interpreter-exec console "set print asm-demangle on"
-> =cmd-param-changed,param="print asm-demangle",value="on"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"cmd-param-changed","output":[["param","print asm-demangle"],["value","on"]]}]}
-> 4^done
GDB -> App: {"output":"","token":4,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
5-enable-pretty-printing
-> 5^done
GDB -> App: {"output":"","token":5,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
6-interpreter-exec console "source /Users/twhiston/.vscode/extensions/marus25.cortex-debug-1.12.1/support/gdbsupport.init"
-> 6^done
GDB -> App: {"output":"","token":6,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
7-interpreter-exec console "source /Users/twhiston/.vscode/extensions/marus25.cortex-debug-1.12.1/support/gdb-swo.init"
-> =cmd-param-changed,param="language",value="c"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"cmd-param-changed","output":[["param","language"],["value","c"]]}]}
-> =cmd-param-changed,param="language",value="auto"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"cmd-param-changed","output":[["param","language"],["value","auto"]]}]}
-> 7^done
GDB -> App: {"output":"","token":7,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
8-interpreter-exec console "set output-radix 0xa"
-> ~"Output radix now set to decimal 10, hex a, octal 12.\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"Output radix now set to decimal 10, hex a, octal 12.\n"}]}
Output radix now set to decimal 10, hex a, octal 12.
-> 8^done
GDB -> App: {"output":"","token":8,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
9-interpreter-exec console "set input-radix 0xa"
-> ~"Input radix now set to decimal 10, hex a, octal 12.\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"Input radix now set to decimal 10, hex a, octal 12.\n"}]}
Input radix now set to decimal 10, hex a, octal 12.
-> 9^done
GDB -> App: {"output":"","token":9,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
10-file-exec-and-symbols "/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/build/primary/zephyr/zephyr.elf"
-> 10^done
GDB -> App: {"output":"","token":10,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
11-target-select extended-remote /dev/cu.usbmodem98B6A4C21
-> 11^connected
GDB -> App: {"output":"","token":11,"outOfBandRecord":[],"resultRecords":{"resultClass":"connected","results":[]}}
12-interpreter-exec console "set confirm off"
-> =cmd-param-changed,param="confirm",value="off"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"cmd-param-changed","output":[["param","confirm"],["value","off"]]}]}
-> 12^done
GDB -> App: {"output":"","token":12,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
13-interpreter-exec console "set pagination off"
-> =cmd-param-changed,param="pagination",value="off"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"cmd-param-changed","output":[["param","pagination"],["value","off"]]}]}
-> 13^done
GDB -> App: {"output":"","token":13,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
14-interpreter-exec console "target extended-remote /dev/cu.usbmodem98B6A4C21"
-> ~"Remote debugging using /dev/cu.usbmodem98B6A4C21\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"Remote debugging using /dev/cu.usbmodem98B6A4C21\n"}]}
Remote debugging using /dev/cu.usbmodem98B6A4C21
-> 14^done
GDB -> App: {"output":"","token":14,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
15-interpreter-exec console "set mem inaccessible-by-default off"
-> =cmd-param-changed,param="mem inaccessible-by-default",value="off"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"cmd-param-changed","output":[["param","mem inaccessible-by-default"],["value","off"]]}]}
-> 15^done
GDB -> App: {"output":"","token":15,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
16-interpreter-exec console "monitor swdp_scan"
-> @"Target voltage: 3.3V\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"target","content":"Target voltage: 3.3V\n"}]}
Target voltage: 3.3V
-> @"Available Targets:\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"target","content":"Available Targets:\n"}]}
Available Targets:
-> @"No. Att Driver\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"target","content":"No. Att Driver\n"}]}
No. Att Driver
-> @" 1      i.MXRT1062 M7\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"target","content":" 1      i.MXRT1062 M7\n"}]}
 1      i.MXRT1062 M7
-> 16^done
GDB -> App: {"output":"","token":16,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
17-interpreter-exec console "attach 1"
-> ~"Attaching to program: /Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/build/primary/zephyr/zephyr.elf, Remote target\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"Attaching to program: /Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/build/primary/zephyr/zephyr.elf, Remote target\n"}]}
Attaching to program: /Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/build/primary/zephyr/zephyr.elf, Remote target
-> =thread-group-started,id="i1",pid="1"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"thread-group-started","output":[["id","i1"],["pid","1"]]}]}
-> =thread-created,id="1",group-id="i1"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"thread-created","output":[["id","1"],["group-id","i1"]]}]}
-> *running,thread-id="1"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"exec","asyncClass":"running","output":[["thread-id","1"]]}]}
mi2.status = running
-> 17^done
GDB -> App: {"output":"","token":17,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
-> ~"__enable_irq () at /Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h:800\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"__enable_irq () at /Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h:800\n"}]}
__enable_irq () at /Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h:800
18-interpreter-exec console "set print inferior-events off"
-> ~"800\t  __ASM volatile (\"cpsie i\" : : : \"memory\");\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"800\t  __ASM volatile (\"cpsie i\" : : : \"memory\");\n"}]}
800	  __ASM volatile ("cpsie i" : : : "memory");
-> *stopped,frame={addr="0x60005184",func="__enable_irq",args=[],file="/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h",fullname="/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h",line="800",arch="armv7e-m"},thread-id="1",stopped-threads="all"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"exec","asyncClass":"stopped","output":[["frame",[["addr","0x60005184"],["func","__enable_irq"],["args",[]],["file","/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h"],["fullname","/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h"],["line","800"],["arch","armv7e-m"]]],["thread-id","1"],["stopped-threads","all"]]}]}
mi2.status = stopped
Program stopped, probably due to a reset and/or halt issued by debugger
-> =cmd-param-changed,param="print inferior-events",value="off"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"cmd-param-changed","output":[["param","print inferior-events"],["value","off"]]}]}
-> 18^done
GDB -> App: {"output":"","token":18,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
19-interpreter-exec console "set mem inaccessible-by-default on"
-> =cmd-param-changed,param="mem inaccessible-by-default",value="on"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"cmd-param-changed","output":[["param","mem inaccessible-by-default"],["value","on"]]}]}
-> 19^done
GDB -> App: {"output":"","token":19,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
20-interpreter-exec console "set remote hardware-breakpoint-limit 6"
-> =cmd-param-changed,param="remote hardware-breakpoint-limit",value="6"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"cmd-param-changed","output":[["param","remote hardware-breakpoint-limit"],["value","6"]]}]}
-> 20^done
GDB -> App: {"output":"","token":20,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
21-interpreter-exec console "set remote hardware-watchpoint-limit 4"
-> =cmd-param-changed,param="remote hardware-watchpoint-limit",value="4"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"cmd-param-changed","output":[["param","remote hardware-watchpoint-limit"],["value","4"]]}]}
-> 21^done
GDB -> App: {"output":"","token":21,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
22-interpreter-exec console "set print inferior-events off"
-> 22^done
GDB -> App: {"output":"","token":22,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[]}}
23-break-insert "/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c:38"
-> ~"Note: automatically using hardware breakpoints for read-only addresses.\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"Note: automatically using hardware breakpoints for read-only addresses.\n"}]}
Note: automatically using hardware breakpoints for read-only addresses.
-> 23^done,bkpt={number="1",type="breakpoint",disp="keep",enabled="y",addr="0x600025ce",func="main",file="/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c",fullname="/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c",line="39",thread-groups=["i1"],times="0",original-location="/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c:38"}
GDB -> App: {"output":"","token":23,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["bkpt",[["number","1"],["type","breakpoint"],["disp","keep"],["enabled","y"],["addr","0x600025ce"],["func","main"],["file","/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c"],["fullname","/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c"],["line","39"],["thread-groups",["i1"]],["times","0"],["original-location","/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c:38"]]]]}}
24-break-insert "/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c:45"
-> 24^error,msg="No line 45 in file \"/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c\"."
GDB -> App: {"output":"","token":24,"outOfBandRecord":[],"resultRecords":{"resultClass":"error","results":[["msg","No line 45 in file \"/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c\"."]]}}
25-thread-list-ids
-> 25^done,thread-ids={thread-id="1"},current-thread-id="1",number-of-threads="1"
GDB -> App: {"output":"","token":25,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["thread-ids",[["thread-id","1"]]],["current-thread-id","1"],["number-of-threads","1"]]}}
26-thread-info 1
-> 26^done,threads=[{id="1",target-id="Thread 1",frame={level="0",addr="0x60005184",func="__enable_irq",args=[],file="/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h",fullname="/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h",line="800",arch="armv7e-m"},state="stopped"}]
GDB -> App: {"output":"","token":26,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["threads",[[["id","1"],["target-id","Thread 1"],["frame",[["level","0"],["addr","0x60005184"],["func","__enable_irq"],["args",[]],["file","/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h"],["fullname","/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h"],["line","800"],["arch","armv7e-m"]]],["state","stopped"]]]]]}}
27-stack-list-frames --thread 1 0 19
-> 27^done,stack=[frame={level="0",addr="0x60005184",func="__enable_irq",file="/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h",fullname="/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h",line="800",arch="armv7e-m"},frame={level="1",addr="0x60005184",func="arch_cpu_idle",file="/Users/twhiston/Code/zephyrproject/zephyr/arch/arm/core/cortex_m/cpu_idle.c",fullname="/Users/twhiston/Code/zephyrproject/zephyr/arch/arm/core/cortex_m/cpu_idle.c",line="104",arch="armv7e-m"},frame={level="2",addr="0x60005940",func="k_cpu_idle",file="/Users/twhiston/Code/zephyrproject/zephyr/include/zephyr/kernel.h",fullname="/Users/twhiston/Code/zephyrproject/zephyr/include/zephyr/kernel.h",line="6608",arch="armv7e-m"},frame={level="3",addr="0x60005940",func="idle",file="/Users/twhiston/Code/zephyrproject/zephyr/kernel/idle.c",fullname="/Users/twhiston/Code/zephyrproject/zephyr/kernel/idle.c",line="75",arch="armv7e-m"}]
GDB -> App: {"output":"","token":27,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["stack",[["frame",[["level","0"],["addr","0x60005184"],["func","__enable_irq"],["file","/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h"],["fullname","/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h"],["line","800"],["arch","armv7e-m"]]],["frame",[["level","1"],["addr","0x60005184"],["func","arch_cpu_idle"],["file","/Users/twhiston/Code/zephyrproject/zephyr/arch/arm/core/cortex_m/cpu_idle.c"],["fullname","/Users/twhiston/Code/zephyrproject/zephyr/arch/arm/core/cortex_m/cpu_idle.c"],["line","104"],["arch","armv7e-m"]]],["frame",[["level","2"],["addr","0x60005940"],["func","k_cpu_idle"],["file","/Users/twhiston/Code/zephyrproject/zephyr/include/zephyr/kernel.h"],["fullname","/Users/twhiston/Code/zephyrproject/zephyr/include/zephyr/kernel.h"],["line","6608"],["arch","armv7e-m"]]],["frame",[["level","3"],["addr","0x60005940"],["func","idle"],["file","/Users/twhiston/Code/zephyrproject/zephyr/kernel/idle.c"],["fullname","/Users/twhiston/Code/zephyrproject/zephyr/kernel/idle.c"],["line","75"],["arch","armv7e-m"]]]]]]}}
28-stack-info-frame --thread 1 --frame 0
-> 28^done,frame={level="0",addr="0x60005184",func="__enable_irq",file="/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h",fullname="/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h",line="800",arch="armv7e-m"}
GDB -> App: {"output":"","token":28,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["frame",[["level","0"],["addr","0x60005184"],["func","__enable_irq"],["file","/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h"],["fullname","/Users/twhiston/Code/zephyrproject/modules/hal/cmsis_6/CMSIS/Core/Include/cmsis_gcc.h"],["line","800"],["arch","armv7e-m"]]]]}}
29-stack-list-variables --thread 1 --frame 0 --simple-values
-> 29^done,variables=[]
GDB -> App: {"output":"","token":29,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["variables",[]]]}}
30-exec-continue --thread 1
-> 30^running
GDB -> App: {"output":"","token":30,"outOfBandRecord":[],"resultRecords":{"resultClass":"running","results":[]}}
-> *running,thread-id="all"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"exec","asyncClass":"running","output":[["thread-id","all"]]}]}
mi2.status = running
-> =thread-group-added,id="i2"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"thread-group-added","output":[["id","i2"]]}]}
-> =thread-group-started,id="i2",pid="42000"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"thread-group-started","output":[["id","i2"],["pid","42000"]]}]}
-> &"warning: No executable has been specified and target does not support\ndetermining executable automatically.  Try using the \"file\" command."
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"log","content":"warning: No executable has been specified and target does not support\ndetermining executable automatically.  Try using the \"file\" command."}]}
warning: No executable has been specified and target does not support
determining executable automatically.  Try using the "file" command.
-> &"\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"log","content":"\n"}]}

-> =thread-created,id="2",group-id="i2"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"notify","asyncClass":"thread-created","output":[["id","2"],["group-id","i2"]]}]}
-> ~"[New Thread 1]\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"[New Thread 1]\n"}]}
[New Thread 1]
-> ~"\nThread "
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"\nThread "}]}

Thread
-> ~"2.1 received signal SIGTRAP, Trace/breakpoint trap.\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"2.1 received signal SIGTRAP, Trace/breakpoint trap.\n"}]}
2.1 received signal SIGTRAP, Trace/breakpoint trap.
-> ~"[Switching to Thread 1]\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"[Switching to Thread 1]\n"}]}
[Switching to Thread 1]
-> ~"0x600025ce in ?? ()\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"0x600025ce in ?? ()\n"}]}
0x600025ce in ?? ()
-> *stopped,reason="signal-received",signal-name="SIGTRAP",signal-meaning="Trace/breakpoint trap",frame={addr="0x600025ce",func="??",args=[],arch="arm"},thread-id="2",stopped-threads="all"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"exec","asyncClass":"stopped","output":[["reason","signal-received"],["signal-name","SIGTRAP"],["signal-meaning","Trace/breakpoint trap"],["frame",[["addr","0x600025ce"],["func","??"],["args",[]],["arch","arm"]]],["thread-id","2"],["stopped-threads","all"]]}]}
mi2.status = stopped
31-thread-list-ids
-> 31^done,thread-ids={thread-id="1",thread-id="2"},current-thread-id="2",number-of-threads="2"
GDB -> App: {"output":"","token":31,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["thread-ids",[["thread-id","1"],["thread-id","2"]]],["current-thread-id","2"],["number-of-threads","2"]]}}
32-thread-info 1
-> 32^done,threads=[{id="1",target-id="Thread 1",frame={level="0",addr="0x600025ce",func="main",args=[],file="/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c",fullname="/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c",line="39",arch="armv7e-m"},state="stopped"}]
GDB -> App: {"output":"","token":32,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["threads",[[["id","1"],["target-id","Thread 1"],["frame",[["level","0"],["addr","0x600025ce"],["func","main"],["args",[]],["file","/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c"],["fullname","/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c"],["line","39"],["arch","armv7e-m"]]],["state","stopped"]]]]]}}
33-thread-info 2
-> 33^done,threads=[{id="2",target-id="Thread 1",frame={level="0",addr="0x600025ce",func="??",args=[],arch="arm"},state="stopped"}]
GDB -> App: {"output":"","token":33,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["threads",[[["id","2"],["target-id","Thread 1"],["frame",[["level","0"],["addr","0x600025ce"],["func","??"],["args",[]],["arch","arm"]]],["state","stopped"]]]]]}}
34-stack-list-frames --thread 2 0 19
-> 34^done,stack=[frame={level="0",addr="0x600025ce",func="??",arch="arm"}]
GDB -> App: {"output":"","token":34,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["stack",[["frame",[["level","0"],["addr","0x600025ce"],["func","??"],["arch","arm"]]]]]]}}
35-thread-list-ids
-> 35^done,thread-ids={thread-id="1",thread-id="2"},current-thread-id="2",number-of-threads="2"
GDB -> App: {"output":"","token":35,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["thread-ids",[["thread-id","1"],["thread-id","2"]]],["current-thread-id","2"],["number-of-threads","2"]]}}
36-thread-info 1
-> 36^done,threads=[{id="1",target-id="Thread 1",frame={level="0",addr="0x600025ce",func="main",args=[],file="/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c",fullname="/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c",line="39",arch="armv7e-m"},state="stopped"}]
GDB -> App: {"output":"","token":36,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["threads",[[["id","1"],["target-id","Thread 1"],["frame",[["level","0"],["addr","0x600025ce"],["func","main"],["args",[]],["file","/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c"],["fullname","/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c"],["line","39"],["arch","armv7e-m"]]],["state","stopped"]]]]]}}
37-thread-info 2
-> 37^done,threads=[{id="2",target-id="Thread 1",frame={level="0",addr="0x600025ce",func="??",args=[],arch="arm"},state="stopped"}]
GDB -> App: {"output":"","token":37,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["threads",[[["id","2"],["target-id","Thread 1"],["frame",[["level","0"],["addr","0x600025ce"],["func","??"],["args",[]],["arch","arm"]]],["state","stopped"]]]]]}}
38-exec-next --thread 1
-> 38^running
GDB -> App: {"output":"","token":38,"outOfBandRecord":[],"resultRecords":{"resultClass":"running","results":[]}}
-> *running,thread-id="1"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"exec","asyncClass":"running","output":[["thread-id","1"]]}]}
mi2.status = running
-> *running,thread-id="2"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"exec","asyncClass":"running","output":[["thread-id","2"]]}]}
mi2.status = running
-> ~"\nThread "
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"\nThread "}]}

Thread
-> ~"2.1 received signal SIGTRAP, Trace/breakpoint trap.\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"2.1 received signal SIGTRAP, Trace/breakpoint trap.\n"}]}
2.1 received signal SIGTRAP, Trace/breakpoint trap.
-> ~"[Switching to Thread 1]\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"[Switching to Thread 1]\n"}]}
[Switching to Thread 1]
-> ~"0x600025ce in ?? ()\n"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":true,"type":"console","content":"0x600025ce in ?? ()\n"}]}
0x600025ce in ?? ()
-> *stopped,reason="signal-received",signal-name="SIGTRAP",signal-meaning="Trace/breakpoint trap",frame={addr="0x600025ce",func="??",args=[],arch="arm"},thread-id="2",stopped-threads="all"
GDB -> App: {"output":"","outOfBandRecord":[{"isStream":false,"type":"exec","asyncClass":"stopped","output":[["reason","signal-received"],["signal-name","SIGTRAP"],["signal-meaning","Trace/breakpoint trap"],["frame",[["addr","0x600025ce"],["func","??"],["args",[]],["arch","arm"]]],["thread-id","2"],["stopped-threads","all"]]}]}
mi2.status = stopped
39-thread-list-ids
-> 39^done,thread-ids={thread-id="1",thread-id="2"},current-thread-id="2",number-of-threads="2"
GDB -> App: {"output":"","token":39,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["thread-ids",[["thread-id","1"],["thread-id","2"]]],["current-thread-id","2"],["number-of-threads","2"]]}}
40-thread-info 1
-> 40^done,threads=[{id="1",target-id="Thread 1",frame={level="0",addr="0x600025ce",func="main",args=[],file="/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c",fullname="/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c",line="39",arch="armv7e-m"},state="stopped"}]
GDB -> App: {"output":"","token":40,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["threads",[[["id","1"],["target-id","Thread 1"],["frame",[["level","0"],["addr","0x600025ce"],["func","main"],["args",[]],["file","/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c"],["fullname","/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c"],["line","39"],["arch","armv7e-m"]]],["state","stopped"]]]]]}}
41-thread-info 2
-> 41^done,threads=[{id="2",target-id="Thread 1",frame={level="0",addr="0x600025ce",func="??",args=[],arch="arm"},state="stopped"}]
GDB -> App: {"output":"","token":41,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["threads",[[["id","2"],["target-id","Thread 1"],["frame",[["level","0"],["addr","0x600025ce"],["func","??"],["args",[]],["arch","arm"]]],["state","stopped"]]]]]}}
42-stack-list-frames --thread 2 0 19
-> 42^done,stack=[frame={level="0",addr="0x600025ce",func="??",arch="arm"}]
GDB -> App: {"output":"","token":42,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["stack",[["frame",[["level","0"],["addr","0x600025ce"],["func","??"],["arch","arm"]]]]]]}}
43-stack-list-frames --thread 1 0 19
-> 43^done,stack=[frame={level="0",addr="0x600025ce",func="main",file="/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c",fullname="/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c",line="39",arch="armv7e-m"}]
GDB -> App: {"output":"","token":43,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["stack",[["frame",[["level","0"],["addr","0x600025ce"],["func","main"],["file","/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c"],["fullname","/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c"],["line","39"],["arch","armv7e-m"]]]]]]}}
44-stack-info-frame --thread 1 --frame 0
-> 44^done,frame={level="0",addr="0x600025ce",func="main",file="/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c",fullname="/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c",line="39",arch="armv7e-m"}
GDB -> App: {"output":"","token":44,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["frame",[["level","0"],["addr","0x600025ce"],["func","main"],["file","/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c"],["fullname","/Users/twhiston/Code/zephyrproject/projects/workbenchblinkytest/src/main.c"],["line","39"],["arch","armv7e-m"]]]]}}
45-stack-list-variables --thread 1 --frame 0 --simple-values
-> 45^done,variables=[{name="ret",type="int",value="0"},{name="led_state",type="_Bool",value="true"}]
GDB -> App: {"output":"","token":45,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["variables",[[["name","ret"],["type","int"],["value","0"]],[["name","led_state"],["type","_Bool"],["value","true"]]]]]}}
46-var-create --thread 1 --frame 0 var_ret_4096 @ "ret"
-> 46^done,name="var_ret_4096",numchild="0",value="0",type="int",has_more="0"
GDB -> App: {"output":"","token":46,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["name","var_ret_4096"],["numchild","0"],["value","0"],["type","int"],["has_more","0"]]}}
47-var-create --thread 1 --frame 0 var_led_state_4096 @ "led_state"
-> 47^done,name="var_led_state_4096",numchild="0",value="true",type="_Bool",has_more="0"
GDB -> App: {"output":"","token":47,"outOfBandRecord":[],"resultRecords":{"resultClass":"done","results":[["name","var_led_state_4096"],["numchild","0"],["value","true"],["type","_Bool"],["has_more","0"]]}}

[haneefdm]

Several points.

• Thread groups are completely ignored already. Both by us and by VSCode...since we don't even report them. Also, thread groups are not the same as threads and are not inpretted as such by any one. All it means is gdb is tracking another program. We are not confused about thread-groups vs threads.
• Thread created/selected is passed on to VSCode but we don't do anything with that. This is because most of the time this info is unreliable. VSCode also doesn't do anything with this info
• The moment of truth when everybody synchronizes is when the program pauses, using the output of -thread-list-ids, -thread-info, etc. Everything else is trash/ignored. This has to work properly and no lying allowed. This is BMPs responsibility.
• We don't do anything with "rtos" property. We just pass it along to the gdb-server if it has such a command-line options (or other mechanism). We ourselves totally ignore it. But, we always expect threads and are ready for it anytime gdb reports them to us. And we can't ignore them either. Some people for instance use openocd and specify an RTOS in their startup tcl scripts instead of telling us. We expect this

Now, I don't think GDB is making stuff up. It 1000% relies on what BMP is telling it. If GDB is lying to us, it is because BMP is lying to GDB.

It is not uncommon for threads (even a single one) to have a bad/invalid address. Happens and is expected, especially at reset or during an exception. Just that we can't show you any code. GDB is fine with it and so are us and VSCode. Also happens when source code is not available...the same is assumed here. Cortex-Debug always assumes threads. If they are reported to us, we report those to VSCode. Again, nothing happens if we can't get frames for those threads.

I can't answer why PlatformIO does not have an issue. It is most likely that your startup sequence is different somehow.

There are many people using BMP so may be some Google searches might help. I can't, as I don't have a HW setup for it.

Also, why are you using "external" server type? Zephyr related? So, even if we do something extra special for BMP (which is doubtful), it wont help you. Most people just launch or attach directly from VSCode even for BMP. I did a simple google search and it resulted in the following "launch" example.

{
  "name": "BMP Debug (SWD)",
  "cwd": "${workspaceRoot}",
  "executable": "${workspaceRoot}/build/your_program.elf", // Path to your built ELF file
  "request": "launch",
  "type": "cortex-debug",
  "servertype": "bmp",
  "interface": "swd", // Or "jtag" if required
  "device": "STM32F103", // Specify your target device identifier
  "BMPGDBSerialPort": "/dev/cu.usbmodem<somenumber>", // Replace with your actual port
  "runToEntryPoint": "main", // Optional: run to the main function after flashing
  "svdFile": "${workspaceRoot}/path/to/your.svd" // Optional: for peripheral register viewing
}

Did you contact BMP as to why they are reporting junk threads?