Messages in this thread | | | Date | Tue, 29 Mar 2005 14:11:30 -0500 | From | Dmitry Torokhov <> | Subject | Re: swsusp 'disk' fails in bk-current - intel_agp at fault? |
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On Tue, 29 Mar 2005 20:18:31 +0200, Pavel Machek <pavel@suse.cz> wrote: > Hi! > > > If you look at Andy's second trace you will see that we are waiting > > for the disk I/O to get /sbin/hotplug from the disk. Pavel, do you > > know why IO does not complete? khelper is a kernel thread so it is > > marked with > > PF_NOFREEZE. Could it be that we managed to freeze kblockd? > > Uf, no idea about kblockd freezing -- we certainly should not. > > *But*, if we are doing execve while system is frozen, something is > very wrong. We should not be doing execve in the first place.
Well, there lies a problem - some devices have to do execve because they need firmware to operate. Also, again, some buses with hot-pluggable devices will attempt to clean up unsuccessful resume and this will cause hotplug events. The point is you either resume system or you don't. We probably need a separate "unfreeze" callback, although this is kind of messy.
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