i killed the rio this rc was living in and got this backtrace.
somebody killed runq->cmdfd.
- erik
/sys/lib/acid/port
/sys/lib/acid/386
acid: lstk()
rchr(b=0x0)+0x7 /sys/src/cmd/rc/io.c:71
getnext()+0x54 /sys/src/cmd/rc/lex.c:68
c=0x1f428
nextc()+0x10 /sys/src/cmd/rc/lex.c:35
yylex()+0x8 /sys/src/cmd/rc/lex.c:179
w=0xdfffdeac
d=0x6a58
c=0x1f430
t=0x1f430
yylex1()+0x8 /sys/src/cmd/rc/syn.y:224
yyparse()+0xaa4 /sys/src/cmd/rc/syn.y:316
save1=0x0
save2=0x32d70
save3=0x0
save4=0x0
yystate=0x0
yychar=0xffffffff
yys=0xdfffdf3c
yyp=0xdfffdf2c
yyn=0x111
yypt=0xdfffdf3c
i=0x1
Xrdcmds()+0x75 /sys/src/cmd/rc/exec.c:866
p=0x31a70
main(argc=0x1,argv=0xdfffefb4)+0x327 /sys/src/cmd/rc/exec.c:184
rcmain=0x16428
num=0x36333038
bootstrap=0x2
i=0x0
_main+0x31 /sys/src/libc/386/main9.s:16
