On 5/8/18 10:42 AM, Mike Galbraith wrote: > On Tue, 2018-05-08 at 08:55 -0600, Jens Axboe wrote: >> >> All the block debug files are empty... > > Sigh. Take 2, this time cat debug files, having turned block tracing > off before doing anything else (so trace bits in dmesg.txt should end > AT the stall). OK, that's better. What I see from the traces: - You have regular IO and some non-fs IO (from scsi_execute()). This mix may be key. - sdd has nothing pending, yet has 6 active waitqueues. I'm going to see if I can reproduce this. Paolo, what kind of attempts to reproduce this have you done? -- Jens Axboe
