term% acid -l vpasm.acid 39742
/proc/39742/text:amd64 plan 9 executable
/sys/lib/acid/port
/sys/lib/acid/amd64
acid: lstk()
<stdin>:2: (error) no stack frame: 
acid: 
echo kill > /proc/39742/ctl
term% acid 39742
/proc/39742/text:amd64 plan 9 executable
/sys/lib/acid/port
/sys/lib/acid/amd64
acid: lstk()
memset(c=0x0,n=0xfffffff8)+0x2d /sys/src/libc/amd64/memset.s:32
emalloc(sz=0xfffffffffffffff8)+0x133 /usr/glenda/src/tmp/nvp/vpasm.c:108
	v=0x406f88
getinstr(str=0x406e48)+0xe3 /usr/glenda/src/tmp/nvp/vpasm.c:128
	inst=0x406e88
	tmp=0x406f48
	sline=0x2008ab
	slen=0x406f4800000000
handleinst(str=0x406e48)+0x48 /usr/glenda/src/tmp/nvp/vpasm.c:200
readsrcline(bf=0x402628)+0xca /usr/glenda/src/tmp/nvp/vpasm.c:279
	str=0x406e48
main(argv=0x7ffffeffef80,argc=0x0)+0x146 /usr/glenda/src/tmp/nvp/vpasm.c:473
	srcfile=0x4025a8
	outfile=0x4025e8
	st=0x4046a800000000
	_argc=0x6f
	_args=0x401c0e
	srcfd=0x402628
	outfd=0x4046a8
_main+0x40 /sys/src/libc/amd64/main9.s:15