On 8/22/18 8:27 AM, Jens Axboe wrote: > On 8/22/18 6:54 AM, Holger Hoffstätte wrote: >> On 08/22/18 06:10, Jens Axboe wrote: >>> [...] >>> If you have time, please look at the 3 patches I posted earlier today. >>> Those are for mainline, so should be OK :-) >> >> I'm just playing along at home but with those 3 I get repeatable >> hangs & writeback not starting at all, but curiously *only* on my btrfs >> device; for inexplicable reasons some other devices with ext4/xfs flush >> properly. Yes, that surprised me too, but it's repeatable. >> Now this may or may not have something to do with some of my in-testing >> patches for btrfs itself, but if I remove those 3 wbt fixes, everything >> is golden again. Not eager to repeat since it hangs sync & requires a >> hard reboot.. :( >> Just thought you'd like to know. > > Thanks, that's very useful info! I'll see if I can reproduce that. Any chance you can try with and see which patch is causing the issue? I can't reproduce it here, seems solid. Either that, or a reproducer would be great... -- Jens Axboe
