On Tue, Feb 27, 2007 at 10:51:27PM +0100, Rafael J. Wysocki wrote: > We have a problem with freezable workqueues in 2.6.21-rc1 and in -mm > (there are only two of them, in XFS, but still). Namely, their worker threads > deadlock with workqueue_cpu_callback() that gets called during the CPU > hotplug, > becuase workqueue_cpu_callback() tries to stop these threads while they are > frozen (disable_nonboot_cpus() happens after we've frozen tasks).
This problem (of kthread_stopping a frozen thread) was there when we implemented freezer-based cpu hotplug. We worked around that in the callbacks by thawing the worker thread first before kthread_stopping it, which is working pretty neatly. Should that fix the issue? -- Regards, vatsa - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
