Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [Suspend2-devel] Re: [ 00/10] [Suspend2] Modules support. | Date | Tue, 7 Feb 2006 16:16:56 +0100 |
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Hi,
On Tuesday 07 February 2006 01:16, Nigel Cunningham wrote: > On Tuesday 07 February 2006 07:07, Jim Crilly wrote: > > On 02/06/06 12:56:43AM +0100, Rafael J. Wysocki wrote: > > > > > > Oh. What's Pavel's solution? Fail freezing if uninterruptible > > > > > > threads don't freeze? > > > > > > > > > > Yes. > > > > > > > > > > AFAICT it's to avoid situations in which we would freeze having a > > > > > process in the D state that holds a semaphore or a mutex neded for > > > > > suspending or resuming devices (or later on for saving the image > > > > > etc.). > > > > > > > > > > [I didn't answer this question previously, sorry.] > > > > > > > > S'okay. This thread is an ocotpus :) > > > > > > > > Are there real life examples of this? I can't think of a single time > > > > that I've heard of something like this happening. I do see rare > > > > problems with storage drivers not having driver model support right, > > > > and thereby causing hangs, but that's brokenness in a completely > > > > different way. > > > > > > > > In short, I'm wondering if (apart from the forking issue), this is a > > > > straw man. > > > > > > It doesn't seem to be very probable to me too, but I take this > > > argument as valid. > > > > > > Greetings, > > > Rafael > > > > CIFS was good for that, if you have a CIFS filesystem mounted and > > take the network interface down (which I have my hibernate script do) > > before the filesystem is umounted it'll become impossible to umount > > the filesystem until the next reboot and I believe the cifsd kernel > > thread will be unfreezable. It's been a while since I've done that > > so it might be fixed now, but someone should verify it if it still > > exists and potentially work with the CIFS people to get it fixed. > > Thanks for the pointer. I'll take a look at this.
Yes, that's interesting. If we have an actual test case, it'll help us a lot.
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