[src/trunk]: src/usr.sbin/perfused Document a bug when processes hang on uvn_...

[manu <manu%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/aded052851a8
branches:  trunk
changeset: 772059:aded052851a8
user:      manu <manu%NetBSD.org@localhost>
date:      Fri Dec 16 10:57:43 2011 +0000

description:
Document a bug when processes hang on uvn_fp2. FWIW, hung process exhibit
this stack backtrace:
sleepq_block
mtsleep
uvn_findpage
uvn_findpages
genfs_getpages
puffs_vnop_getpages
puffs_vnop_checkop
VOP_GETPAGES
uvn_get
uvm_fault_internal
trap
copyin
uiomove
ubc_uiomove
puffs_vnop_write
puffs_vnop_checkop
VOP_WRITE
vn_write
dofilewrite
sys_write
syscall

diffstat:

 usr.sbin/perfused/perfused.8 |  10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diffs (24 lines):

diff -r f4283e91f479 -r aded052851a8 usr.sbin/perfused/perfused.8
--- a/usr.sbin/perfused/perfused.8      Fri Dec 16 05:34:54 2011 +0000
+++ b/usr.sbin/perfused/perfused.8      Fri Dec 16 10:57:43 2011 +0000
@@ -1,4 +1,4 @@
-.\" $NetBSD: perfused.8,v 1.5 2011/05/10 12:16:18 njoly Exp $
+.\" $NetBSD: perfused.8,v 1.6 2011/12/16 10:57:43 manu Exp $
 .\"
 .\" Copyright (c) 2010 Emmanuel Dreyfus. All rights reserved.
 .\"
@@ -124,6 +124,14 @@
 For detailed debugging use the
 .Fl d
 (debug) option.
+.Sh BUGS
+When 
+.Nm
+runs in the foreground (using the
+.Fl f
+flag), some processes using the FUSE filesystem will 
+sometime hang on 
+.Sq uvn_fp2 .
 .Sh SEE ALSO
 .Xr mount 2 ,
 .Xr perfuse_mount 3 ,