NetBSD Problem Report #38778

From njoly@lanfeust.sis.pasteur.fr  Wed May 28 12:44:35 2008
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Date: Wed, 28 May 2008 14:44:33 +0200 (CEST)
From: njoly@pasteur.fr
Reply-To: njoly@pasteur.fr
To: gnats-bugs@gnats.NetBSD.org
Subject: /kern files do not show up anymore after quite some time
X-Send-Pr-Version: 3.95

>Number:         38778
>Category:       kern
>Synopsis:       /kern files do not show up anymore after quite some time
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed May 28 12:45:00 +0000 2008
>Closed-Date:    Sat Jan 17 23:19:07 +0000 2009
>Last-Modified:  Wed Feb 12 20:00:02 +0000 2020
>Originator:     Nicolas Joly
>Release:        NetBSD 4.99.63
>Organization:
Biological Software and Databanks.
Institut Pasteur, Paris.
>Environment:
System: NetBSD lanfeust.sis.pasteur.fr 4.99.63 NetBSD 4.99.63 (LANFEUST) #16: Wed May 28 13:08:09 CEST 2008 njoly@lanfeust.sis.pasteur.fr:/local/src/NetBSD/obj.amd64/sys/arch/amd64/compile/LANFEUST amd64
Architecture: x86_64
Machine: amd64
>Description:
On a freshly booted system there is no problems to see files under /kern;
after quite some time/use (cvs up src + kerne build), they do not show
up anymore but remain available.

njoly@lanfeust [NetBSD/src]> mount -t kernfs -v 
kernfs on /kern type kernfs (local, fsid: 0x8b01/0x1d28b, reads: sync 0 async 0, writes: sync 0 async 0)
njoly@lanfeust [NetBSD/src]> ls -l /kern
total 63
-r--r--r--  1 root  wheel             11 May 28 13:55 boottime
-r--r--r--  1 root  wheel            264 May 28 14:04 copyright
-rw-r--r--  1 root  wheel             24 May 28 14:04 hostname
-r--r--r--  1 root  wheel              4 May 28 14:04 hz
-r--r--r--  1 root  wheel             11 May 28 14:04 loadavg
-r--r--r--  1 root  wheel          32736 May 28 14:04 msgbuf
-r--r--r--  1 root  wheel              5 May 28 14:04 pagesize
-r--r--r--  1 root  wheel              7 May 28 14:04 physmem
brw-r-----  1 root  operator        0, 0 Mar 21  2005 rootdev
crw-r-----  1 root  operator        3, 0 Nov  4  2005 rrootdev
-r--r--r--  1 root  wheel             18 May 28 14:04 time
-r--r--r--  1 root  wheel            152 May 28 14:04 version
njoly@lanfeust [NetBSD/src]> cvs -q up                              
[...]
njoly@lanfeust [NetBSD/src]> ./build.sh -Uu -m amd64 kernel=LANFEUST
[...]
njoly@lanfeust [NetBSD/src]> ls -l /kern
njoly@lanfeust [NetBSD/src]> ls -l /kern/loadavg
-r--r--r--  1 root  wheel  13 May 28 14:39 /kern/loadavg
njoly@lanfeust [NetBSD/src]> cat /kern/loadavg
0 0 109 2048

Here is the corresponding trace:
 14255      1 ls       CALL  open(0x7f7ffd803400,4,0)
 14255      1 ls       NAMI  "/kern"
 14255      1 ls       RET   open 4
[...]
 14255      1 ls       CALL  lseek(4,0,0,1)
 14255      1 ls       RET   lseek 0
 14255      1 ls       CALL  __getdents30(4,0x7f7ffd813000,0x1000)
 14255      1 ls       RET   __getdents30 -1 errno 9 Bad file descriptor
 14255      1 ls       CALL  close(4)
 14255      1 ls       RET   close 0

This is mostly from a GENERIC+DIAGNOSTIC kernel, with a few other devices.
>How-To-Repeat:
ls -l /kern
[do some other stuff ...]
ls -l /kern
>Fix:
n/a

>Release-Note:

>Audit-Trail:

State-Changed-From-To: open->closed
State-Changed-By: snj@NetBSD.org
State-Changed-When: Sat, 17 Jan 2009 23:19:07 +0000
State-Changed-Why:
Duplicate of 38265.


From: "Taylor R Campbell" <riastradh@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/38778 CVS commit: src/sys/miscfs/kernfs
Date: Tue, 4 Feb 2020 04:19:25 +0000

 Module Name:	src
 Committed By:	riastradh
 Date:		Tue Feb  4 04:19:24 UTC 2020

 Modified Files:
 	src/sys/miscfs/kernfs: kernfs.h kernfs_vfsops.c kernfs_vnops.c

 Log Message:
 Use specfs vnops for specnodes in kernfs.

 While here, don't filter out rootdev and rrootdev merely because
 they're not cached.

 Fixes the elusive /kern/rootdev and /kern/rrootdev nodes, which only
 appeared sometimes when they felt like it, and fixes operations on
 /kern/rootdev and /kern/rrootdev always returning EOPNOTSUPP.

 We didn't seem to have a single PR for these issues but the following
 PRs are all relevant:

 PR bin/13564
 PR kern/38265
 PR kern/38778
 PR kern/45974

 XXX pullup-9, pullup-8, pullup-7, pullup-6, pullup-5, pullup-4, pullup-3, pullup-2, pullup-1.4T...


 To generate a diff of this commit:
 cvs rdiff -u -r1.42 -r1.43 src/sys/miscfs/kernfs/kernfs.h
 cvs rdiff -u -r1.97 -r1.98 src/sys/miscfs/kernfs/kernfs_vfsops.c
 cvs rdiff -u -r1.162 -r1.163 src/sys/miscfs/kernfs/kernfs_vnops.c

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

From: "Martin Husemann" <martin@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/38778 CVS commit: [netbsd-9] src/sys/miscfs/kernfs
Date: Wed, 12 Feb 2020 19:59:23 +0000

 Module Name:	src
 Committed By:	martin
 Date:		Wed Feb 12 19:59:22 UTC 2020

 Modified Files:
 	src/sys/miscfs/kernfs [netbsd-9]: kernfs.h kernfs_vfsops.c
 	    kernfs_vnops.c

 Log Message:
 Pull up following revision(s) (requested by riastradh in ticket #702):

 	sys/miscfs/kernfs/kernfs_vfsops.c: revision 1.98
 	sys/miscfs/kernfs/kernfs_vnops.c: revision 1.163
 	sys/miscfs/kernfs/kernfs.h: revision 1.43

 Use specfs vnops for specnodes in kernfs.

 While here, don't filter out rootdev and rrootdev merely because
 they're not cached.

 Fixes the elusive /kern/rootdev and /kern/rrootdev nodes, which only
 appeared sometimes when they felt like it, and fixes operations on
 /kern/rootdev and /kern/rrootdev always returning EOPNOTSUPP.

 We didn't seem to have a single PR for these issues but the following
 PRs are all relevant:

 PR bin/13564
 PR kern/38265
 PR kern/38778
 PR kern/45974

 XXX pullup-9, pullup-8, pullup-7, pullup-6, pullup-5, pullup-4, pullup-3, p=
 ullup-2, pullup-1.4T...


 To generate a diff of this commit:
 cvs rdiff -u -r1.40 -r1.40.32.1 src/sys/miscfs/kernfs/kernfs.h
 cvs rdiff -u -r1.96 -r1.96.18.1 src/sys/miscfs/kernfs/kernfs_vfsops.c
 cvs rdiff -u -r1.160.4.1 -r1.160.4.2 src/sys/miscfs/kernfs/kernfs_vnops.c

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

>Unformatted:

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