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kernel: keep segment locked for data2txt

--- a/sys/src/9/port/segment.c

+++ b/sys/src/9/port/segment.c

@@ -186,9 +186,10 @@

 	case SG_DATA:		/* Copy on write plus demand load info */

 		if(segno == TSEG){

+			n = data2txt(s);

 			poperror();

 			qunlock(&s->lk);

-			return data2txt(s);

+			return n;

 		}

 		if(share)

-- 

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