[lldb] [Process/FreeBSDKernel] Select paniced thread automatically (llvm#178069)

Kernel panic is a special case, and there is no signal or exception for
that so we need to rely on special workaround called `dumptid`.
FreeBSDKernel plugin is supposed to find this thread and set it manually
through `SetStopInfo()` in `CalculateStopInfo()` like Mach core plugin
does.

Before (We had to find and select crashed thread list otherwise thread 1
was selected by default):
```
➜ sudo lldb /boot/panic/kernel -c /var/crash/vmcore.last
(lldb) target create "/boot/panic/kernel" --core "/var/crash/vmcore.last"
Core file '/var/crash/vmcore.last' (x86_64) was loaded.
(lldb) bt
* thread #1, name = '(pid 12991) dtrace'
  * frame #0: 0xffffffff80bf9322 kernel`sched_switch(td=0xfffff8015882f780, flags=259) at sched_ule.c:2448:26
    frame #1: 0xffffffff80bd38d2 kernel`mi_switch(flags=259) at kern_synch.c:530:2
    frame #2: 0xffffffff80c29799 kernel`sleepq_switch(wchan=0xfffff8014edff300, pri=0) at subr_sleepqueue.c:608:2
    frame #3: 0xffffffff80c29b76 kernel`sleepq_catch_signals(wchan=0xfffff8014edff300, pri=0) at subr_sleepqueue.c:523:3
    frame #4: 0xffffffff80c29d32 kernel`sleepq_timedwait_sig(wchan=<unavailable>, pri=<unavailable>) at subr_sleepqueue.c:704:11
    frame #5: 0xffffffff80bd2e2d kernel`_sleep(ident=0xfffff8014edff300, lock=0xffffffff81df2880, priority=768, wmesg="uwait", sbt=2573804118162, pr=0, flags=512) at kern_synch.c:215:10
    frame #6: 0xffffffff80be8622 kernel`umtxq_sleep(uq=0xfffff8014edff300, wmesg="uwait", timo=0xfffffe0279cb3d20) at kern_umtx.c:843:11
    frame #7: 0xffffffff80bef87a kernel`do_wait(td=0xfffff8015882f780, addr=<unavailable>, id=0, timeout=0xfffffe0279cb3d90, compat32=1, is_private=1) at kern_umtx.c:1316:12
    frame #8: 0xffffffff80bed264 kernel`__umtx_op_wait_uint_private(td=0xfffff8015882f780, uap=0xfffffe0279cb3dd8, ops=<unavailable>) at kern_umtx.c:3990:10
    frame #9: 0xffffffff80beaabe kernel`sys__umtx_op [inlined] kern__umtx_op(td=<unavailable>, obj=<unavailable>, op=<unavailable>, val=<unavailable>, uaddr1=<unavailable>, uaddr2=<unavailable>, ops=<unavailable>) at kern_umtx.c:4999:10
    frame #10: 0xffffffff80beaa89 kernel`sys__umtx_op(td=<unavailable>, uap=<unavailable>) at kern_umtx.c:5024:10
    frame #11: 0xffffffff81122cd1 kernel`amd64_syscall [inlined] syscallenter(td=0xfffff8015882f780) at subr_syscall.c:165:11
    frame llvm#12: 0xffffffff81122c19 kernel`amd64_syscall(td=0xfffff8015882f780, traced=0) at trap.c:1208:2
    frame llvm#13: 0xffffffff810f1dbb kernel`fast_syscall_common at exception.S:570
```

After:
```
➜ sudo ./build/bin/lldb /boot/panic/kernel -c /var/crash/vmcore.last
(lldb) target create "/boot/panic/kernel" --core "/var/crash/vmcore.last"
Core file '/var/crash/vmcore.last' (x86_64) was loaded.
(lldb) bt
* thread llvm#18, name = '(pid 5409) powerd (crashed)', stop reason = kernel panic
  * frame #0: 0xffffffff80bc6c91 kernel`__curthread at pcpu_aux.h:57:2 [inlined]
    frame #1: 0xffffffff80bc6c91 kernel`doadump(textdump=0) at kern_shutdown.c:399:2
    frame #2: 0xffffffff804b3b7a kernel`db_dump(dummy=<unavailable>, dummy2=<unavailable>, dummy3=<unavailable>, dummy4=<unavailable>) at db_command.c:596:10
    frame #3: 0xffffffff804b396d kernel`db_command(last_cmdp=<unavailable>, cmd_table=<unavailable>, dopager=true) at db_command.c:508:3
    frame #4: 0xffffffff804b362d kernel`db_command_loop at db_command.c:555:3
    frame #5: 0xffffffff804b7026 kernel`db_trap(type=<unavailable>, code=<unavailable>) at db_main.c:267:3
    frame #6: 0xffffffff80c16aaf kernel`kdb_trap(type=3, code=0, tf=0xfffffe01b605b930) at subr_kdb.c:790:13
    frame #7: 0xffffffff8112154e kernel`trap(frame=<unavailable>) at trap.c:614:8
    frame #8: 0xffffffff810f14c8 kernel`calltrap at exception.S:285
    frame #9: 0xffffffff81da2290 kernel`cn_devtab + 64
    frame #10: 0xfffffe01b605b8b0
    frame #11: 0xffffffff84001c43 dtrace.ko`dtrace_panic(format=<unavailable>) at dtrace.c:652:2
    frame llvm#12: 0xffffffff84005524 dtrace.ko`dtrace_action_panic(ecb=0xfffff80539cad580) at dtrace.c:7022:2 [inlined]
    frame llvm#13: 0xffffffff840054de dtrace.ko`dtrace_probe(id=88998, arg0=14343377283488, arg1=<unavailable>, arg2=<unavailable>, arg3=<unavailable>, arg4=<unavailable>) at dtrace.c:7665:6
    frame llvm#14: 0xffffffff83e5213d systrace.ko`systrace_probe(sa=<unavailable>, type=<unavailable>, retval=<unavailable>) at systrace.c:226:2
    frame llvm#15: 0xffffffff8112318d kernel`syscallenter(td=0xfffff801318d5780) at subr_syscall.c:160:4 [inlined]
    frame llvm#16: 0xffffffff81123112 kernel`amd64_syscall(td=0xfffff801318d5780, traced=0) at trap.c:1208:2
    frame llvm#17: 0xffffffff810f1dbb kernel`fast_syscall_common at exception.S:570
```

Author: mchoo7

lldb/source/Plugins/Process/FreeBSDKernel/ProcessFreeBSDKernel.cpp

@@ -242,9 +242,13 @@ bool ProcessFreeBSDKernel::DoUpdateThreadList(ThreadList &old_thread_list,
           thread_desc += llvm::formatv(" (on CPU {0})", oncpu);
         }
 
-        ThreadSP thread_sp{
-            new ThreadFreeBSDKernel(*this, tid, pcb_addr, thread_desc)};
-        new_thread_list.AddThread(thread_sp);
+        auto thread =
+            new ThreadFreeBSDKernel(*this, tid, pcb_addr, thread_desc);
+
+        if (tid == dumptid)
+          thread->SetIsCrashedThread(true);
+
+        new_thread_list.AddThread(static_cast<ThreadSP>(thread));
       }
     }
   } else {

lldb/source/Plugins/Process/FreeBSDKernel/ThreadFreeBSDKernel.cpp

@@ -8,6 +8,7 @@
 
 #include "ThreadFreeBSDKernel.h"
 
+#include "lldb/Target/StopInfo.h"
 #include "lldb/Target/Unwind.h"
 #include "lldb/Utility/Log.h"
 
@@ -82,4 +83,12 @@ ThreadFreeBSDKernel::CreateRegisterContextForFrame(StackFrame *frame) {
   return reg_ctx_sp;
 }
 
-bool ThreadFreeBSDKernel::CalculateStopInfo() { return false; }
+bool ThreadFreeBSDKernel::CalculateStopInfo() {
+  if (m_is_crashed) {
+    // Set a stop reason for crashing threads only so that they get selected
+    // preferentially.
+    SetStopInfo(StopInfo::CreateStopReasonWithException(*this, "kernel panic"));
+    return true;
+  }
+  return false;
+}

lldb/source/Plugins/Process/FreeBSDKernel/ThreadFreeBSDKernel.h

@@ -38,13 +38,16 @@ class ThreadFreeBSDKernel : public lldb_private::Thread {
       m_thread_name.clear();
   }
 
+  void SetIsCrashedThread(bool is_crashed) { m_is_crashed = is_crashed; }
+
 protected:
   bool CalculateStopInfo() override;
 
 private:
   std::string m_thread_name;
   lldb::RegisterContextSP m_thread_reg_ctx_sp;
   lldb::addr_t m_pcb_addr;
+  bool m_is_crashed = false;
 };
 
 #endif // LLDB_SOURCE_PLUGINS_PROCESS_FREEBSDKERNEL_THREADFREEBSDKERNEL_H