* Re: malicious filesystems (was Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM
@ 2007-07-14 21:21 Oleg Nesterov
2007-07-15 13:06 ` Miklos Szeredi
0 siblings, 1 reply; 3+ messages in thread
From: Oleg Nesterov @ 2007-07-14 21:21 UTC (permalink / raw)
To: Miklos Szeredi; +Cc: Rafael J. Wysocki, Pavel Machek, linux-kernel
I am sorry for being completely off-topic, but
Miklos Szeredi wrote:
>
> SIGKILL won't work on a stopped task. Neither on a traced task.
Why do you think so? It works in both cases (ptracer can use
PT_TRACE_EXIT, but the task is killed anyway).
> Neither on a zombie (how many newbies are thoroughly confused about
> that ;)
This is true. Unless this zombie is a group leader, and we have other
threads.
Oleg.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: malicious filesystems (was Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM
2007-07-14 21:21 malicious filesystems (was Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM Oleg Nesterov
@ 2007-07-15 13:06 ` Miklos Szeredi
2007-07-21 9:28 ` Pavel Machek
0 siblings, 1 reply; 3+ messages in thread
From: Miklos Szeredi @ 2007-07-15 13:06 UTC (permalink / raw)
To: oleg; +Cc: rjw, pavel, linux-kernel
> > SIGKILL won't work on a stopped task. Neither on a traced task.
>
> Why do you think so? It works in both cases (ptracer can use
> PT_TRACE_EXIT, but the task is killed anyway).
Just from experience with tasks stuck in "T" state. After for example
an UML dies, some of the processes only react to SIGCONT, but not to
SIGKILL.
I have no idea why this happens.
Miklos
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: malicious filesystems (was Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM
2007-07-15 13:06 ` Miklos Szeredi
@ 2007-07-21 9:28 ` Pavel Machek
0 siblings, 0 replies; 3+ messages in thread
From: Pavel Machek @ 2007-07-21 9:28 UTC (permalink / raw)
To: Miklos Szeredi; +Cc: oleg, rjw, linux-kernel
On Sun 2007-07-15 15:06:59, Miklos Szeredi wrote:
> > > SIGKILL won't work on a stopped task. Neither on a traced task.
> >
> > Why do you think so? It works in both cases (ptracer can use
> > PT_TRACE_EXIT, but the task is killed anyway).
>
> Just from experience with tasks stuck in "T" state. After for example
> an UML dies, some of the processes only react to SIGCONT, but not to
> SIGKILL.
>
> I have no idea why this happens.
Anyway that should be fixed, not used as excuse for fuse misbehaviour.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2007-07-21 9:28 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-07-14 21:21 malicious filesystems (was Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM Oleg Nesterov
2007-07-15 13:06 ` Miklos Szeredi
2007-07-21 9:28 ` Pavel Machek
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