diff --git a/sys/dev/sound/pcm/sound.c b/sys/dev/sound/pcm/sound.c
--- a/sys/dev/sound/pcm/sound.c
+++ b/sys/dev/sound/pcm/sound.c
@@ -674,23 +674,53 @@
 	return (err);
 }
 
-static int
-pcm_killchan(device_t dev)
+static void
+pcm_killchans(struct snddev_info *d)
 {
-	struct snddev_info *d = device_get_softc(dev);
 	struct pcm_channel *ch;
 	int error;
+	bool found;
 
 	PCM_BUSYASSERT(d);
+	do {
+		found = false;
+		CHN_FOREACH(ch, d, channels.pcm) {
+			CHN_LOCK(ch);
+			/*
+			 * We found an awake channel, proceed with destroying
+			 * it. If we force-destroy all channels without
+			 * checking if they are sleeping or not, we might panic
+			 * in cv_timedwait_sig() after calling
+			 * chn_lockdestroy() on a sleeping channel, because it
+			 * will still be using a freed lock/cv.
+			 */
+			if ((ch->flags & CHN_F_SLEEPING) == 0) {
+				found = true;
+				CHN_UNLOCK(ch);
+				break;
+			}
+			CHN_UNLOCK(ch);
+		}
 
-	ch = CHN_FIRST(d, channels.pcm);
+		/*
+		 * All channels are still sleeping. Sleep for a bit and try
+		 * again to see if any of them is awake now.
+		 */
+		if (!found) {
+			int timo = hz * 5/1000;
 
-	PCM_LOCK(d);
-	error = pcm_chn_remove(d, ch);
-	PCM_UNLOCK(d);
-	if (error)
-		return (error);
-	return (pcm_chn_destroy(ch));
+			if (timo < 1)
+				timo = 1;
+			pause("sleepchan", timo);
+			continue;
+		}
+
+		PCM_LOCK(d);
+		error = pcm_chn_remove(d, ch);
+		PCM_UNLOCK(d);
+		if (error == 0)
+			pcm_chn_destroy(ch);
+	} while (!CHN_EMPTY(d, channels.pcm));
 }
 
 static int
@@ -1034,8 +1064,7 @@
 		d->rec_sysctl_tree = NULL;
 	}
 
-	while (!CHN_EMPTY(d, channels.pcm))
-		pcm_killchan(dev);
+	pcm_killchans(d);
 
 	PCM_LOCK(d);
 	PCM_RELEASE(d);