From 6dfd657c01b49bcc87562c8de45fc4b8adf976d1 Mon Sep 17 00:00:00 2001
From: John Baldwin <jhb@FreeBSD.org>
Date: Fri, 19 Aug 2011 21:28:40 +0000
Subject: [PATCH] Walk the zombproc list as well as the allproc list when
 enumerating threads and processes in a kernel image.  This allows examination
 of threads that have exited or are in the late stages of exiting.

Tested by:	avg
Approved by:	re (kib)
MFC after:	1 week
---
 gnu/usr.bin/gdb/kgdb/kthr.c | 81 ++++++++++++++++++++++---------------
 1 file changed, 48 insertions(+), 33 deletions(-)

diff --git a/gnu/usr.bin/gdb/kgdb/kthr.c b/gnu/usr.bin/gdb/kgdb/kthr.c
index 461f408a73d9..b12d07c28e2c 100644
--- a/gnu/usr.bin/gdb/kgdb/kthr.c
+++ b/gnu/usr.bin/gdb/kgdb/kthr.c
@@ -73,11 +73,52 @@ kgdb_thr_first(void)
 	return (first);
 }
 
-struct kthr *
-kgdb_thr_init(void)
+static void
+kgdb_thr_add_procs(uintptr_t paddr)
 {
 	struct proc p;
 	struct thread td;
+	struct kthr *kt;
+	CORE_ADDR addr;
+
+	while (paddr != 0) {
+		if (kvm_read(kvm, paddr, &p, sizeof(p)) != sizeof(p)) {
+			warnx("kvm_read: %s", kvm_geterr(kvm));
+			break;
+		}
+		addr = (uintptr_t)TAILQ_FIRST(&p.p_threads);
+		while (addr != 0) {
+			if (kvm_read(kvm, addr, &td, sizeof(td)) !=
+			    sizeof(td)) {
+				warnx("kvm_read: %s", kvm_geterr(kvm));
+				break;
+			}
+			kt = malloc(sizeof(*kt));
+			kt->next = first;
+			kt->kaddr = addr;
+			if (td.td_tid == dumptid)
+				kt->pcb = dumppcb;
+			else if (td.td_state == TDS_RUNNING && stoppcbs != 0 &&
+			    CPU_ISSET(td.td_oncpu, &stopped_cpus))
+				kt->pcb = (uintptr_t)stoppcbs +
+				    sizeof(struct pcb) * td.td_oncpu;
+			else
+				kt->pcb = (uintptr_t)td.td_pcb;
+			kt->kstack = td.td_kstack;
+			kt->tid = td.td_tid;
+			kt->pid = p.p_pid;
+			kt->paddr = paddr;
+			kt->cpu = td.td_oncpu;
+			first = kt;
+			addr = (uintptr_t)TAILQ_NEXT(&td, td_plist);
+		}
+		paddr = (uintptr_t)LIST_NEXT(&p, p_list);
+	}
+}
+
+struct kthr *
+kgdb_thr_init(void)
+{
 	long cpusetsize;
 	struct kthr *kt;
 	CORE_ADDR addr;
@@ -113,37 +154,11 @@ kgdb_thr_init(void)
 
 	stoppcbs = kgdb_lookup("stoppcbs");
 
-	while (paddr != 0) {
-		if (kvm_read(kvm, paddr, &p, sizeof(p)) != sizeof(p)) {
-			warnx("kvm_read: %s", kvm_geterr(kvm));
-			break;
-		}
-		addr = (uintptr_t)TAILQ_FIRST(&p.p_threads);
-		while (addr != 0) {
-			if (kvm_read(kvm, addr, &td, sizeof(td)) !=
-			    sizeof(td)) {
-				warnx("kvm_read: %s", kvm_geterr(kvm));
-				break;
-			}
-			kt = malloc(sizeof(*kt));
-			kt->next = first;
-			kt->kaddr = addr;
-			if (td.td_tid == dumptid)
-				kt->pcb = dumppcb;
-			else if (td.td_state == TDS_RUNNING && stoppcbs != 0 &&
-			    CPU_ISSET(td.td_oncpu, &stopped_cpus))
-				kt->pcb = (uintptr_t) stoppcbs + sizeof(struct pcb) * td.td_oncpu;
-			else
-				kt->pcb = (uintptr_t)td.td_pcb;
-			kt->kstack = td.td_kstack;
-			kt->tid = td.td_tid;
-			kt->pid = p.p_pid;
-			kt->paddr = paddr;
-			kt->cpu = td.td_oncpu;
-			first = kt;
-			addr = (uintptr_t)TAILQ_NEXT(&td, td_plist);
-		}
-		paddr = (uintptr_t)LIST_NEXT(&p, p_list);
+	kgdb_thr_add_procs(paddr);
+	addr = kgdb_lookup("zombproc");
+	if (addr != 0) {
+		kvm_read(kvm, addr, &paddr, sizeof(paddr));
+		kgdb_thr_add_procs(paddr);
 	}
 	curkthr = kgdb_thr_lookup_tid(dumptid);
 	if (curkthr == NULL)