* RE: processes stuck in D state
@ 2003-05-06 17:09 pwitting
2003-05-06 17:31 ` Michael Buesch
0 siblings, 1 reply; 12+ messages in thread
From: pwitting @ 2003-05-06 17:09 UTC (permalink / raw)
To: nfs; +Cc: fsdeveloper
Actually, I have seen this on the server before, specifically
When using an older version of IBM's JFS for Linux with RH 7.3
I worked with the JFS team and JFS v1.1.0 and kernel 2.4.20
seemed to stabilize it, at least I've seen no more "freezes"
as a result. Judging by your mail address this might be your
problem as well.
One noticeable symptom is that cd'ing to an affected dir and
attempting an ls would also freeze (I had a large (20GB+) file
copy going, so I usually knew what the affected dir was.
Two other things that helped:
1) increasing the # of nfs threads (120 or more)
2) ensuring the uid/gid the remote thread was using existed on
the server. (sounds stupid but it helped)
neither "cured" the issue, but it went from being reproducible
to being occasional.
Good Luck.
> From: "Lever, Charles" <Charles.Lever@netapp.com>
>
> i'm not sure why you mailed neilb -- this appears to
> be NFS client related, not server related.
>
> can you spell out the sequence of events that leads
> to the stuck processes? it looks like the client
> is working-as-designed, but if you can provide more
> details, we can verify what's going on.
>
>> -----Original Message-----
>> From: Michael Buesch [mailto:fsdeveloper@yahoo.de]
>> Sent: Tuesday, May 06, 2003 10:52 AM
>> To: neilb@cse.unsw.edu.au
>> Cc: nfs@lists.sourceforge.net
>> Subject: [NFS] processes stuck in D state
>>
>> Please take a look at this problem:
>>
>> [linux-kernel-mailing-list thread]
>> http://marc.theaimsgroup.com/?t=3D98639966100003&r=3D1&w=3D2
>>
>> thanks.
>> Please cc me, as I'm not subscribed to the nfs-list.
-------------------------------------------------------
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The only event dedicated to issues related to Linux enterprise solutions
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^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: processes stuck in D state
2003-05-06 17:09 processes stuck in D state pwitting
@ 2003-05-06 17:31 ` Michael Buesch
0 siblings, 0 replies; 12+ messages in thread
From: Michael Buesch @ 2003-05-06 17:31 UTC (permalink / raw)
To: pwitting; +Cc: nfs
=2D----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On Tuesday 06 May 2003 19:09, pwitting@Cyveillance.com wrote:
> Actually, I have seen this on the server before, specifically
> When using an older version of IBM's JFS for Linux with RH 7.3
I'm running ext3 on the server.
> I worked with the JFS team and JFS v1.1.0 and kernel 2.4.20
> seemed to stabilize it, at least I've seen no more "freezes"
> as a result.
server-kernel is 2.4.21-pre6.
> Judging by your mail address this might be your
> problem as well.
You refer to the "fs" in my e-mail address? :)
The "fs" stands for "FreeSoftware".
> One noticeable symptom is that cd'ing to an affected dir and
> attempting an ls would also freeze (I had a large (20GB+) file
> copy going, so I usually knew what the affected dir was.
>
> Two other things that helped:
> 1) increasing the # of nfs threads (120 or more)
> 2) ensuring the uid/gid the remote thread was using existed on
> the server. (sounds stupid but it helped)
>
> neither "cured" the issue, but it went from being reproducible
> to being occasional.
>
> Good Luck.
thanks. :)
=2D --=20
Regards Michael B=FCsch
http://www.8ung.at/tuxsoft
19:26:58 up 3:18, 2 users, load average: 1.01, 1.08, 1.05
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=3DNi5P
=2D----END PGP SIGNATURE-----
-------------------------------------------------------
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^ permalink raw reply [flat|nested] 12+ messages in thread
* Processes stuck in D state
@ 2004-02-18 16:33 Olaf Kirch
0 siblings, 0 replies; 12+ messages in thread
From: Olaf Kirch @ 2004-02-18 16:33 UTC (permalink / raw)
To: nfs; +Cc: Olaf Hering
[-- Attachment #1: Type: text/plain, Size: 1337 bytes --]
Hi,
I spent much of today investigating a weird NFS problem on 2.6.3.
After one of our servers went away and came back, several processes on
a ppc machine were left in D state. They did not get woken up during
the whole day, until I did a "umount -f" after several hours of debugging.
The internal state of this RPC client looks a little weird. I'm
attaching some debug output that shows where they got stuck. Some
general observation:
- this does not seem a queue corruption bug, which is good :)
- the tasks were sleeping on different wait queues (pending,
sending, 1 one resend)
- all tasks have a tk_timeout value of 0
- the ntimeo values of the RTT estimators being 0 looks a
little weird, given that the mount froze because the
server wasn't reachable.
- the task on the resend queue has a timer with
tk_timer.expires != 0, but unfortunately I forgot to check whether
it was active. But I doubt it; I had debugging enabled for much
of the day and the tk_pid in question never showed up in the log
I'm not sure yet what exactly happened here. I don't understand how a
task on xprt->pending can have a timeout value of 0...
Does anyone have an idea what might be going wrong here?
Olaf
--
Olaf Kirch | Stop wasting entropy - start using predictable
okir@suse.de | tempfile names today!
---------------+
[-- Attachment #2: nfs-messages --]
[-- Type: text/plain, Size: 1489 bytes --]
Found NFS mount, server=Hilbert2,v3,rsize=8192,wsize=8192
RPC client 6 users
Active RPC tasks for this client:
task 21384, status=-11, timeout=0, active, sleeping, on queue c45ea044(xprt_sending)
task 9969, status=-11, timeout=0, active, sleeping, on queue c45ea044(xprt_sending)
task 52431, status=-11, timeout=0, active, sleeping, on queue c45ea044(xprt_sending)
task 43528, status=-11, timeout=0, active, sleeping, on queue c45ea044(xprt_sending)
task 43527, status=-11, timeout=0, timer, async, active, sleeping, on queue c45ea050(xprt_resend)
task 55816, status=0, timeout=0, active, sleeping, on queue c45ea05c(xprt_pending)
Transport c45ea000, sockstate=0x1
cong 256/cwnd 256
RTT estimates (def timeout 700):
0: rtt 15 srtt 100 ntimeo 0
1: rtt 15 srtt 100 ntimeo 0
2: rtt 49 srtt 100 ntimeo 0
3: rtt 15 srtt 100 ntimeo 0
4: rtt 15 srtt 100 ntimeo 0
RPC wait queue sending:
task 43528, status=-11, timeout=0, active, sleeping
task 52431, status=-11, timeout=0, active, sleeping
task 9969, status=-11, timeout=0, active, sleeping
task 21384, status=-11, timeout=0, active, sleeping
RPC wait queue pending:
task 55816, status=0, timeout=0, active, sleeping
RPC wait queue resend:
task 43527, status=-11, timeout=0, active timer, async, active, sleeping
RPC wait queue backlog: empty
^ permalink raw reply [flat|nested] 12+ messages in thread* RE: processes stuck in D state
@ 2003-05-06 18:32 Guolin Cheng
0 siblings, 0 replies; 12+ messages in thread
From: Guolin Cheng @ 2003-05-06 18:32 UTC (permalink / raw)
To: 'Lever, Charles', Michael Buesch, Andy Jewell,
Jonathan Baker, Paul Sauer
Cc: nfs, neilb, Ops
Hi, all,
We are encountering the same problem here as well,=20
=20
[root@arc100 root]# ps auxw
......
andy 9087 0.0 3.2 12900 10312 ? D May05 0:02
/0/tmp/av_explore .index /net/arc295/0/DQ_crawl26.20030416034937.arc.gz
......
although the nfs server has no problem at all. If I try to "ls
/net/arc295/0" then the new "ls" process will hang as well.
The method I followed to fix the problem is:
[root@arc100 root]# umount -f /net/arc295/0
umount2: Device or resource busy
umount: /net/arc295/0: Illegal seek
[root@arc100 root]# /etc/init.d/amd restart
Stopping amd: [ OK ]
Starting amd: [ OK ]
[root@arc100 root]# cd /net/arc295/0
[root@arc100 0]# ls=20
My nfs clients/servers has the same configurations:=20
Redhat 8.0
General Linux Kernel 2.4.20 ("nfs over tcp" is enabled)
gcc-3.2-7=20
amd ( am-utils-6.0.7-9 )
amd mount options in map amd.master
(opts:=3Drw,intr,nfsv3,tcp,nosuid,nodev,noresvport)
The real amd mount status for the nfs directory:
arc295:/0 on /.amd_mnt/arc295/host/0 type nfs
(rw,intr,nfsv3,tcp,nosuid,nodev,noresvport,dev=3D0000f10e,vers=3D3,proto=
=3Dtcp)
Any one need more info the shoot the sort of problem, let me know.
Thanks.
--Guolin Cheng
-----Original Message-----
From: Lever, Charles [mailto:Charles.Lever@netapp.com]
Sent: Tuesday, May 06, 2003 8:18 AM
To: Michael Buesch
Cc: nfs@lists.sourceforge.net; neilb@cse.unsw.edu.au
Subject: RE: [NFS] processes stuck in D state
hi michael-
i'm not sure why you mailed neilb -- this appears to
be NFS client related, not server related.
can you spell out the sequence of events that leads
to the stuck processes? it looks like the client
is working-as-designed, but if you can provide more
details, we can verify what's going on.
> -----Original Message-----
> From: Michael Buesch [mailto:fsdeveloper@yahoo.de]
> Sent: Tuesday, May 06, 2003 10:52 AM
> To: neilb@cse.unsw.edu.au
> Cc: nfs@lists.sourceforge.net
> Subject: [NFS] processes stuck in D state
>=20
>=20
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>=20
> Hi!
>=20
> Please take a look at this problem:
>=20
> [linux-kernel-mailing-list thread]
> http://marc.theaimsgroup.com/?t=3D98639966100003&r=3D1&w=3D2
>=20
> thanks.
> Please cc me, as I'm not subscribed to the nfs-list.
>=20
> - --=20
> Regards Michael B=FCsch
> http://www.8ung.at/tuxsoft
> 16:28:34 up 20 min, 1 user, load average: 1.07, 0.97, 0.66
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.2.1 (GNU/Linux)
>=20
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> gAMZvSHQirHmE8yZChpgH/8=3D
> =3Dpka2
> -----END PGP SIGNATURE-----
>=20
>=20
>=20
> -------------------------------------------------------
> Enterprise Linux Forum Conference & Expo, June 4-6, 2003, Santa Clara
> The only event dedicated to issues related to Linux=20
> enterprise solutions
> www.enterpriselinuxforum.com
>=20
> _______________________________________________
> NFS maillist - NFS@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/nfs
>=20
-------------------------------------------------------
Enterprise Linux Forum Conference & Expo, June 4-6, 2003, Santa Clara
The only event dedicated to issues related to Linux enterprise =
solutions
www.enterpriselinuxforum.com
_______________________________________________
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https://lists.sourceforge.net/lists/listinfo/nfs
-------------------------------------------------------
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_______________________________________________
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^ permalink raw reply [flat|nested] 12+ messages in thread* RE: processes stuck in D state
@ 2003-05-06 15:47 Lever, Charles
0 siblings, 0 replies; 12+ messages in thread
From: Lever, Charles @ 2003-05-06 15:47 UTC (permalink / raw)
To: Michael Buesch; +Cc: nfs, linux kernel mailing list, Zeev Fisher
> To reproduce the problem:
> - - mount some nfs from a server in your lan.
> - - Open an app, that uses the mounted fs. I've simply opened a
> konqueror-window for the directory where the nfs is mounted.
> - - shut down or crash the server or just pull the network-cable.
> - - Now the konqueror-process is nonkillable in D state. There's no
> chance to kill it.
does the problem persist after you reconnect the network cable?
what happens when the server becomes available again?
are you mounting with UDP or TCP?
-------------------------------------------------------
Enterprise Linux Forum Conference & Expo, June 4-6, 2003, Santa Clara
The only event dedicated to issues related to Linux enterprise solutions
www.enterpriselinuxforum.com
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^ permalink raw reply [flat|nested] 12+ messages in thread
* RE: processes stuck in D state
@ 2003-05-06 15:18 Lever, Charles
0 siblings, 0 replies; 12+ messages in thread
From: Lever, Charles @ 2003-05-06 15:18 UTC (permalink / raw)
To: Michael Buesch; +Cc: nfs, neilb
hi michael-
i'm not sure why you mailed neilb -- this appears to
be NFS client related, not server related.
can you spell out the sequence of events that leads
to the stuck processes? it looks like the client
is working-as-designed, but if you can provide more
details, we can verify what's going on.
> -----Original Message-----
> From: Michael Buesch [mailto:fsdeveloper@yahoo.de]
> Sent: Tuesday, May 06, 2003 10:52 AM
> To: neilb@cse.unsw.edu.au
> Cc: nfs@lists.sourceforge.net
> Subject: [NFS] processes stuck in D state
>=20
>=20
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>=20
> Hi!
>=20
> Please take a look at this problem:
>=20
> [linux-kernel-mailing-list thread]
> http://marc.theaimsgroup.com/?t=3D98639966100003&r=3D1&w=3D2
>=20
> thanks.
> Please cc me, as I'm not subscribed to the nfs-list.
>=20
> - --=20
> Regards Michael B=FCsch
> http://www.8ung.at/tuxsoft
> 16:28:34 up 20 min, 1 user, load average: 1.07, 0.97, 0.66
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.2.1 (GNU/Linux)
>=20
> iD8DBQE+t8wdoxoigfggmSgRAm5aAJsGJLPe9yUd4sqah4yiU0GsMIAGzACfSa2+
> gAMZvSHQirHmE8yZChpgH/8=3D
> =3Dpka2
> -----END PGP SIGNATURE-----
>=20
>=20
>=20
> -------------------------------------------------------
> Enterprise Linux Forum Conference & Expo, June 4-6, 2003, Santa Clara
> The only event dedicated to issues related to Linux=20
> enterprise solutions
> www.enterpriselinuxforum.com
>=20
> _______________________________________________
> NFS maillist - NFS@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/nfs
>=20
-------------------------------------------------------
Enterprise Linux Forum Conference & Expo, June 4-6, 2003, Santa Clara
The only event dedicated to issues related to Linux enterprise solutions
www.enterpriselinuxforum.com
_______________________________________________
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^ permalink raw reply [flat|nested] 12+ messages in thread
* processes stuck in D state
@ 2003-05-06 14:51 Michael Buesch
2003-05-06 15:20 ` Trond Myklebust
0 siblings, 1 reply; 12+ messages in thread
From: Michael Buesch @ 2003-05-06 14:51 UTC (permalink / raw)
To: neilb; +Cc: nfs
=2D----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Hi!
Please take a look at this problem:
[linux-kernel-mailing-list thread]
http://marc.theaimsgroup.com/?t=3D98639966100003&r=3D1&w=3D2
thanks.
Please cc me, as I'm not subscribed to the nfs-list.
=2D --=20
Regards Michael B=FCsch
http://www.8ung.at/tuxsoft
16:28:34 up 20 min, 1 user, load average: 1.07, 0.97, 0.66
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Version: GnuPG v1.2.1 (GNU/Linux)
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gAMZvSHQirHmE8yZChpgH/8=3D
=3Dpka2
=2D----END PGP SIGNATURE-----
-------------------------------------------------------
Enterprise Linux Forum Conference & Expo, June 4-6, 2003, Santa Clara
The only event dedicated to issues related to Linux enterprise solutions
www.enterpriselinuxforum.com
_______________________________________________
NFS maillist - NFS@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nfs
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: processes stuck in D state
2003-05-06 14:51 Michael Buesch
@ 2003-05-06 15:20 ` Trond Myklebust
2003-05-06 15:41 ` Michael Buesch
0 siblings, 1 reply; 12+ messages in thread
From: Trond Myklebust @ 2003-05-06 15:20 UTC (permalink / raw)
To: Michael Buesch; +Cc: neilb, nfs
>>>>> " " == Michael Buesch <fsdeveloper@yahoo.de> writes:
> Hi! Please take a look at this problem:
> [linux-kernel-mailing-list thread]
> http://marc.theaimsgroup.com/?t=98639966100003&r=1&w=2
If I can hazard a guess: someone is firewalling the lockd port and/or
the statd port.
Either mount using the 'nolock' option, or fix the firewall (see the
HOWTO and/or FAQ).
Cheers,
Trond
-------------------------------------------------------
Enterprise Linux Forum Conference & Expo, June 4-6, 2003, Santa Clara
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^ permalink raw reply [flat|nested] 12+ messages in thread* Re: processes stuck in D state
2003-05-06 15:20 ` Trond Myklebust
@ 2003-05-06 15:41 ` Michael Buesch
2003-05-06 16:05 ` Trond Myklebust
0 siblings, 1 reply; 12+ messages in thread
From: Michael Buesch @ 2003-05-06 15:41 UTC (permalink / raw)
To: Trond Myklebust
Cc: neilb, nfs, Lever, Charles, linux kernel mailing list,
Zeev Fisher
=2D----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On Tuesday 06 May 2003 17:20, Trond Myklebust wrote:
> >>>>> " " =3D=3D Michael Buesch <fsdeveloper@yahoo.de> writes:
> > Hi! Please take a look at this problem:
> >
> > [linux-kernel-mailing-list thread]
> > http://marc.theaimsgroup.com/?t=3D98639966100003&r=3D1&w=3D2
>
> If I can hazard a guess: someone is firewalling the lockd port and/or
> the statd port.
>
> Either mount using the 'nolock' option, or fix the firewall (see the
> HOWTO and/or FAQ).
To reproduce the problem:
=2D - mount some nfs from a server in your lan.
=2D - Open an app, that uses the mounted fs. I've simply opened a
konqueror-window for the directory where the nfs is mounted.
=2D - shut down or crash the server or just pull the network-cable.
=2D - Now the konqueror-process is nonkillable in D state. There's no
chance to kill it.
I've tried it with all firewalls disabled, but the problem resists.
> Cheers,
> Trond
@linux-kernel-mailing-list: I've posted a thread to nfs-mailing list with
the same topic as in lkml. IMHO this is the better list for this problem. :)
=2D --=20
Regards Michael B=FCsch
http://www.8ung.at/tuxsoft
17:34:35 up 1:26, 5 users, load average: 1.52, 1.32, 1.13
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=2D----END PGP SIGNATURE-----
-------------------------------------------------------
Enterprise Linux Forum Conference & Expo, June 4-6, 2003, Santa Clara
The only event dedicated to issues related to Linux enterprise solutions
www.enterpriselinuxforum.com
_______________________________________________
NFS maillist - NFS@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nfs
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: processes stuck in D state
2003-05-06 15:41 ` Michael Buesch
@ 2003-05-06 16:05 ` Trond Myklebust
2003-05-06 16:30 ` Michael Buesch
0 siblings, 1 reply; 12+ messages in thread
From: Trond Myklebust @ 2003-05-06 16:05 UTC (permalink / raw)
To: Michael Buesch
Cc: Trond Myklebust, neilb, nfs, Lever, Charles,
linux kernel mailing list, Zeev Fisher
>>>>> " " == Michael Buesch <fsdeveloper@yahoo.de> writes:
> To reproduce the problem:
> - - mount some nfs from a server in your lan.
> - - Open an app, that uses the mounted fs. I've simply opened a
> konqueror-window for the directory where the nfs is mounted.
> - - shut down or crash the server or just pull the
> network-cable.
> - - Now the konqueror-process is nonkillable in D
> state. There's no
> chance to kill it.
Unless you are using the 'intr' or 'soft' mount flags, then that is
*documented and expected* behaviour.
It is true that even when using the 'intr' mount flag, you don't
always succeed in killing a task that is hanging on NFS. That is
usually due to the fact that it is waiting on some semaphore that is
held by another process. semaphores always sleep in the
TASK_UNINTERRUPTIBLE state, so they cannot be signalled.
Linus has suggested a solution to this problem: to set up a special
class of semaphores that are killable with 'SIGKILL', but doing that
(and then replacing all those semaphores in the VFS and VM) is not
going to happen before 2.7.x. at the earliest.
However, as I've mentioned on this list *many* times before: there
exists a workaround if you are wanting to kill all processes in order
to unmount the partition:
kill -9 all the processes.
kill -9 rpciod.
Cheers,
Trond
-------------------------------------------------------
Enterprise Linux Forum Conference & Expo, June 4-6, 2003, Santa Clara
The only event dedicated to issues related to Linux enterprise solutions
www.enterpriselinuxforum.com
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^ permalink raw reply [flat|nested] 12+ messages in thread* Re: processes stuck in D state
2003-05-06 16:05 ` Trond Myklebust
@ 2003-05-06 16:30 ` Michael Buesch
2003-05-06 16:54 ` Trond Myklebust
0 siblings, 1 reply; 12+ messages in thread
From: Michael Buesch @ 2003-05-06 16:30 UTC (permalink / raw)
To: trond.myklebust; +Cc: neilb, nfs, linux kernel mailing list, Zeev Fisher
=2D----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On Tuesday 06 May 2003 18:05, Trond Myklebust wrote:
> >>>>> " " =3D=3D Michael Buesch <fsdeveloper@yahoo.de> writes:
> > To reproduce the problem:
> > - - mount some nfs from a server in your lan.
> > - - Open an app, that uses the mounted fs. I've simply opened a
> > konqueror-window for the directory where the nfs is mounted.
> > - - shut down or crash the server or just pull the
> > network-cable.
> > - - Now the konqueror-process is nonkillable in D
> > state. There's no
> > chance to kill it.
>
> Unless you are using the 'intr' or 'soft' mount flags, then that is
> *documented and expected* behaviour.
I'm using intr.
> However, as I've mentioned on this list *many* times before: there
> exists a workaround if you are wanting to kill all processes in order
> to unmount the partition:
> kill -9 all the processes.
> kill -9 rpciod.
kill -9 doesn't work for me to kill the app.
=2D --=20
Regards Michael B=FCsch
http://www.8ung.at/tuxsoft
18:28:55 up 2:20, 5 users, load average: 1.02, 1.06, 1.06
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=2D----END PGP SIGNATURE-----
-------------------------------------------------------
Enterprise Linux Forum Conference & Expo, June 4-6, 2003, Santa Clara
The only event dedicated to issues related to Linux enterprise solutions
www.enterpriselinuxforum.com
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^ permalink raw reply [flat|nested] 12+ messages in thread
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2003-05-06 17:09 processes stuck in D state pwitting
2003-05-06 17:31 ` Michael Buesch
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2004-02-18 16:33 Processes " Olaf Kirch
2003-05-06 18:32 processes " Guolin Cheng
2003-05-06 15:47 Lever, Charles
2003-05-06 15:18 Lever, Charles
2003-05-06 14:51 Michael Buesch
2003-05-06 15:20 ` Trond Myklebust
2003-05-06 15:41 ` Michael Buesch
2003-05-06 16:05 ` Trond Myklebust
2003-05-06 16:30 ` Michael Buesch
2003-05-06 16:54 ` Trond Myklebust
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