On 2019/06/13 23:15, Josef Bacik wrote: > On Fri, Jun 07, 2019 at 10:10:18PM +0900, Naohiro Aota wrote: >> It is possible to have bios stalled in the submit buffer due to some bug or >> device problem. In such situation, btrfs stops working waiting for buffered >> bios completions. To avoid such hang, add a worker that will cancel the >> stalled bios after a timeout. >> > > The block layer does this with it's request timeouts right? So it'll timeout > and we'll get an EIO? If that's not working then we need to fix the block > layer. Thanks, Joseph, The block layer timeout is started only when the request is dispatched. The timeout is not started on BIO/request allocation and so will not trigger for bios stalled inside btrfs scheduler. -- Damien Le Moal Western Digital Research
