rm -rf /proc hangs (was: 2.1.125 Show stopper list: Draft)

Marc Lehmann (pcg@goof.com)
Thu, 15 Oct 1998 20:22:12 +0200

On Mon, Oct 12, 1998 at 02:11:59AM +0100, Alan Cox wrote:
> > > Try rm -rf /proc (sync first)
> >
> > I fixed that many patch levels ago. (And told you.)
>
> Updated

I just tried (2.1.125 SMP):

$ rm -rf /proc (four times), and I got:

test 29341 0.1 0.2 1044 436 ? D 20:18 0:00 rm -rf /proc
test 29343 0.1 0.2 1044 436 ? D 20:18 0:00 rm -rf /proc
test 29344 0.2 0.2 1044 436 ? D 20:18 0:00 rm -rf /proc

They all hang (unkillable & eating cpu) in getdents (the first rm -rf got a
segmentation fault):

lstat("/proc/net/ip_masq", {st_mode=0, st_size=0, ...}) = 0
open("/proc/net/ip_masq", O_RDONLY|O_NONBLOCK) = 3
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
fstat(3, {st_mode=0, st_size=0, ...}) = 0
lseek(3, 0, SEEK_CUR) = 0
getdents(3,

So somewhere there is still a bug (its a nice DoS)

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