ramfs crash

ramfs crash

[Fazlul Shahriar]

Hi,

I've had ramfs crash several times while running Go tests. I was
able to finally get a stack trace today:

cpu% acid 481
/proc/481/text:amd64 plan 9 executable
/sys/lib/acid/port
/sys/lib/acid/amd64
acid: lstk()
abort()+0x0 /sys/src/libc/9sys/abort.c:6
_assert(s=0xd8f7488)+0x42 /sys/src/libc/port/_assert.c:12
treesplay(size=0x1138,t=0xe7d69f0)+0xe5 /sys/src/libc/port/pool.c:257
	N=0x20c5db
	r=0x7fffffffeb00
	l=0x7fffffffeb00
	y=0x407c70
pooldel(p=0x4064e8,node=0xe5737b0)+0x1e /sys/src/libc/port/pool.c:348
	root=0x201000407c70
blockmerge(b=0xe5737b0,a=0xe571790,pool=0x4064e8)+0x5f /sys/src/libc/port/pool.c:419
poolreallocl(ndsize=0x3010,v=0xe571798,p=0x4064e8)+0x378 /sys/src/libc/port/pool.c:1001
	a=0xe571790
	odsize=0x302000002010
	obsize=0x201000002020
	nbsize=0x200000003020
	right=0xf57bb17
	left=0x40a0f9
	nv=0xf56e098
	newb=0x1000
poolrealloc(p=0x4064e8,v=0xe571798,n=0x3010)+0x46 /sys/src/libc/port/pool.c:1264
	nv=0x20d50c
fswrite(r=0xf56e098)+0x20b /sys/src/cmd/ramfs.c:208
	count=0x1000
	off=0x2000
	top=0x3000
	f=0xf561678
	n=0x200000001000
	link=0x20d352
	x=0x4077f0
	p=0xf57bb17
	i=0x100000000000
	o=0x20a3cc00002000
swrite(srv=0x400128,r=0xf56e098)+0x139 /sys/src/lib9p/srv.c:576
srvwork()+0x1e4 /sys/src/lib9p/srv.c:767
	srv=0x400128
	r=0xf56e098
srv(srv=0x400128)+0x13c /sys/src/lib9p/srv.c:847
postproc()+0x34 /sys/src/lib9p/post.c:16
	s=0x400128
rforker(fn=0x20b5ea,arg=0x400128,flag=0x9)+0x30 /sys/src/lib9p/rfork.c:17
postsrv(s=0x400128,name=0x0)+0x148 /sys/src/lib9p/post.c:44
	fd=0x600000005
	buf=0x407770
	cfd=0x5ffffffff
_postmountsrv(s=0x400128,name=0x0,mtpt=0x405e35,flag=0x4)+0x18 /sys/src/lib9p/post.c:58
postmountsrv(name=0x0,mtpt=0x405e35,flag=0x4)+0x32 /sys/src/lib9p/rfork.c:32
main(argc=0x0,argv=0x7fffffffefa0)+0x112 /sys/src/cmd/ramfs.c:514
	srvname=0x0
	mtpt=0x405e35
	stdio=0x400000000
	mountflags=0x405e3500000004
	_argc=0x0
	_args=0x0
_main+0x40 /sys/src/libc/amd64/main9.s:15
acid: