threadexitsall(exitstr=0x417ac0)+0xcd /sys/src/libthread/exit.c:50 _threadsysfatal(arg=0x417f00)+0x6e /sys/src/libthread/lib.c:37 sysfatal(fmt=0x3)+0x1d /sys/src/libc/9sys/sysfatal.c:27 getcanvasimage(fd=0xfefefefe00000003)+0x6e /usr/glenda/build/whiteboardfs/dryerase.c:49 updateproc()+0x76 /usr/glenda/build/whiteboardfs/dryerase.c:106 launcheramd64(arg=0x407898,f=0x2003db)+0x10 /sys/src/libthread/amd64.c:11 0xfefefefefefefefe ?file?:0