On Sun, 25 Dec 2011 14:29:34 +0100 Jens Axboe <axboe@xxxxxxxxx> wrote: > On 2011-12-25 02:02, Tejun Heo wrote: > > While fixing io_context creation / task exit race condition, > > 6e736be7f2 "block: make ioc get/put interface more conventional and > > fix race on alloction" also prevented an exiting (%PF_EXITING) task > > from creating its own io_context. This is incorrect as exit path may > > issue IOs, e.g. from exit_files(), and if those IOs are the first ones > > issued by the task, io_context needs to be created to process the IOs. > > > > Combined with the existing problem of io_context / io_cq creation > > failure having the possibility of stalling IO, this problem results in > > deterministic full IO lockup with certain workloads. > > > > Fix it by allowing io_context creation regardless of %PF_EXITING for > > %current. The patch works for me. > Thanks, applied. So we get another great big bisection hole in mainline. I feel duty bound to rewhine about this :( -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
