On Fri 08-02-13 17:29:18, Michal Hocko wrote: [...] > OK, I have checked the allocator slow path and you are right even > GFP_KERNEL will not fail. This can lead to similar deadlocks - e.g. > OOM killed task blocked on down_write(mmap_sem) while the page fault > handler holding mmap_sem for reading and allocating a new page without > any progress. And now that I think about it some more it sounds like it shouldn't be possible because allocator would fail because it would see TIF_MEMDIE (OOM killer kills all threads that share the same mm). But maybe there are other locks that are dangerous, but I think that the risk is pretty low. -- Michal Hocko SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
