Re: kern/38762: panic: vwakeup: neg numoutput

[Greg Oster <oster%cs.usask.ca@localhost>]

The following reply was made to PR kern/38762; it has been noted by GNATS.

From: Greg Oster <oster%cs.usask.ca@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/38762: panic: vwakeup: neg numoutput 
Date: Sun, 27 Jul 2008 16:27:36 -0600

 Andreas Gustafsson writes:
 > The following reply was made to PR kern/38762; it has been noted by GNATS.
 > 
 > From: gson%gson.org@localhost (Andreas Gustafsson)
 > To: gnats-bugs%NetBSD.org@localhost
 > Cc: 
 > Subject: Re: kern/38762: panic: vwakeup: neg numoutput
 > Date: Sun, 27 Jul 2008 21:49:10 +0300
 > 
 >  The panic still happens with 4.99.70 (source date 20080725-1531 EET).
 
 I'm unable to replicate this panic, but could you try this patch and 
 see if it changes anything? 
 
 Thanks.
 
 Later...
 
 Greg Oster
 
 -----------
 Index: genfs_io.c
 ===================================================================
 RCS file: /cvsroot/src/sys/miscfs/genfs/genfs_io.c,v
 retrieving revision 1.8.2.1
 diff -u -r1.8.2.1 genfs_io.c
 --- genfs_io.c 10 Jun 2008 14:51:22 -0000      1.8.2.1
 +++ genfs_io.c 27 Jul 2008 22:23:43 -0000
 @@ -1513,13 +1513,14 @@
        uio.uio_rw = UIO_WRITE;
        uio.uio_resid = npages << PAGE_SHIFT;
        UIO_SETUP_SYSSPACE(&uio);
 -      /* XXX vn_lock */
 -      error = VOP_WRITE(vp, &uio, 0, cred);
  
        mutex_enter(&vp->v_interlock);
        vp->v_numoutput++;
        mutex_exit(&vp->v_interlock);
  
 +      /* XXX vn_lock */
 +      error = VOP_WRITE(vp, &uio, 0, cred);
 +
        bp = getiobuf(vp, true);
        bp->b_cflags = BC_BUSY | BC_AGE;
        bp->b_lblkno = offset >> vp->v_mount->mnt_fs_bshift;