chirping78 opened a new issue, #8616:
URL: https://github.com/apache/nuttx/issues/8616
Here are some steps to reproduce the issue:
1. build a cortex-m board for qemu
```
./tools/configure.sh -E lm3s6965-ek:qemu-flat
make
```
2. start qemu
```
qemu-system-arm -M lm3s6965evb -device loader,file=nuttx -serial
mon:stdio -nographic -s
```
3. gdb attach
```
gdb-multiarch -ix tools/nuttx-gdbinit nuttx
(gdb) target extended-remote localhost:1234
(gdb) info_nxthreads
saved current_tcb (pid=0)
* 0 Thread 0x20001538 (Name: Idle Task, State: Running, Priority: 0, Stack:
456/1000) PC: 0x96b2 in up_idle()
saved current_tcb (pid=0)
1 Thread 0x20005060 (Name: hpwork, State: Waiting,Semaphore, Priority:
224, Stack: 344/1992) PC: 0x487d in work_thread()
saved current_tcb (pid=0)
2 Thread 0x20005c30 (Name: nsh_main, State: Waiting,Semaphore, Priority:
100, Stack: 1080/2000) PC: 0x1 in _vectors()
saved current_tcb (pid=0)
3 Thread 0x200069f0 (Name: NTP daemon, State: Waiting,Semaphore,
Priority: 100, Stack: 1688/1952) PC: 0x1 in _vectors()
saved current_tcb (pid=0)
4 Thread 0x20008430 (Name: telnetd, State: Waiting,Semaphore, Priority:
100, Stack: 616/2008) PC: 0x20008ec4 in No()
saved current_tcb (pid=0)
saved current_tcb (pid=0)
saved current_tcb (pid=0)
saved current_tcb (pid=0)
(gdb)
```
You can see the PC of thread 2 and 3 is `0x1`, that is an invalid address.
Try the gdb function `nxthread_all_bt` will show incorrect backtrace for these
threads.
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