On Wed, Mar 18, 2020 at 11:55:09AM +0100, Guoqing Jiang wrote: > Hi Ming, > > On 3/18/20 4:43 AM, Ming Lei wrote: > > submit_bio_wait() can be called from ioctl(BLKSECDISCARD), which > > may take long time to complete, as Salman mentioned, 4K BLKSECDISCARD > > takes up to 100 second on some devices. Also any block I/O operation > > that occurs after the BLKSECDISCARD is submitted will also potentially > > be affected by the hung task timeouts. > > > > Another report is that task hang can be observed when running mkfs > > over raid10 which takes a small max discard sectors limit because > > of chunk size. > > Could you point the link about the raid10 task hang? And we have observed > task hang with raid5, not sure it is related or not. > > Our set up is md/raid5 -> 100+ LVs (fs is created on top of one LV), run heavy > IOs on LVs and dbench on the LV with fs, then dbench hangs with 'D' state. Red Hat Bugzilla 1813383. Thanks, Ming
