* [Regression] sshd hangs on close
@ 2008-08-30 9:18 Matthias Urlichs
2008-08-30 20:28 ` Rafael J. Wysocki
0 siblings, 1 reply; 3+ messages in thread
From: Matthias Urlichs @ 2008-08-30 9:18 UTC (permalink / raw)
To: linux-kernel
"top" sees multiple instances of:
6008 root 20 3184 D 0 0:00.06 flush_cpu sshd: root@pts/13
This is 2.6.27rc5, preemption and tickless turned on, on a 4-CPU machine.
(OK, two hyperthreaded ones :-P) strace() shows that this happens on the
last close of its /dev/ptmx file descriptor, which hangs.
I'll do a bisect early next week unless somebody else identifies a likely
suspect.
--
Matthias Urlichs
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Regression] sshd hangs on close
2008-08-30 9:18 [Regression] sshd hangs on close Matthias Urlichs
@ 2008-08-30 20:28 ` Rafael J. Wysocki
2008-08-30 21:14 ` Andrew Morton
0 siblings, 1 reply; 3+ messages in thread
From: Rafael J. Wysocki @ 2008-08-30 20:28 UTC (permalink / raw)
To: Matthias Urlichs
Cc: linux-kernel, Andrew Morton, Ingo Molnar, Thomas Gleixner
[Adding CCs]
On Saturday, 30 of August 2008, Matthias Urlichs wrote:
> "top" sees multiple instances of:
>
> 6008 root 20 3184 D 0 0:00.06 flush_cpu sshd: root@pts/13
>
> This is 2.6.27rc5, preemption and tickless turned on, on a 4-CPU machine.
> (OK, two hyperthreaded ones :-P) strace() shows that this happens on the
> last close of its /dev/ptmx file descriptor, which hangs.
>
> I'll do a bisect early next week unless somebody else identifies a likely
> suspect.
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Regression] sshd hangs on close
2008-08-30 20:28 ` Rafael J. Wysocki
@ 2008-08-30 21:14 ` Andrew Morton
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Morton @ 2008-08-30 21:14 UTC (permalink / raw)
To: Rafael J. Wysocki
Cc: Matthias Urlichs, linux-kernel, Ingo Molnar, Thomas Gleixner
On Sat, 30 Aug 2008 22:28:57 +0200 "Rafael J. Wysocki" <rjw@sisk.pl> wrote:
> [Adding CCs]
>
> On Saturday, 30 of August 2008, Matthias Urlichs wrote:
> > "top" sees multiple instances of:
> >
> > 6008 root 20 3184 D 0 0:00.06 flush_cpu sshd: root@pts/13
> >
> > This is 2.6.27rc5, preemption and tickless turned on, on a 4-CPU machine.
> > (OK, two hyperthreaded ones :-P) strace() shows that this happens on the
> > last close of its /dev/ptmx file descriptor, which hangs.
> >
> > I'll do a bisect early next week unless somebody else identifies a likely
> > suspect.
> >
Please do `echo w > /proc/sysrq-trigger', send the resulting trace.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2008-08-30 9:18 [Regression] sshd hangs on close Matthias Urlichs
2008-08-30 20:28 ` Rafael J. Wysocki
2008-08-30 21:14 ` Andrew Morton
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