On Thu, Sep 18, 2014 at 07:16:13AM +1000, Dave Chinner wrote: > > - Both lru_add_drain and do_sync_work work items are added to > > the same global system_wq > > > > - The current work fn on the system_wq is do_sync_work and is > > blocked waiting to aquire an sb's s_umount for reading > > > > - The umount task is the current owner of the s_umount in > > question but is waiting for do_sync_work to continue. > > Thus we hit a deadlock situation. > > What kernel did you see this deadlock on?
Sorry for the noise. This deadlock was produced under a kernel whereby the workqueue implementation is significantly less sophisticated. -- Aaron Tomlin -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
