2009/11/6 Dorr H. Clark <dcl...@engr.scu.edu>:
>
>
> We believe we have identified a significant resource leak
> present in 6.x, 7.x, and 8.x. We believe this is a regression
> versus FreeBSD 4.x which appears to do the Right Thing (tm).
>
> We have a test program (see below) which will run the system
> out of sockets by repeated exercise of the failing code
> path in the kernel.
>
> Our proposed fix is applied to the file usr/src/sys/fs/fifofs/fifo_vnops.c
>
>
> @@ -237,6 +237,8 @@
> if (ap->a_mode & FWRITE) {
> if ((ap->a_mode & O_NONBLOCK) && fip->fi_readers == 0) {
> mtx_unlock(&fifo_mtx);
> + /* Exclusive VOP lock is held - safe to clean */
> + fifo_cleanup(vp);
> return (ENXIO);
> }
> fip->fi_writers++;
I think it should also check that fip->if_writers == 0 (and possibly
the checks within fifo_cleanup() should just be assertions, but that's
orthogonal someway) and the comment is not needed.
Attilio
--
Peace can only be achieved by understanding - A. Einstein
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