Looks like Fedora have run into this in automated testing, and think it's causing OS installations to hang, which would be a release blocking bug. Is this really a Btrfs bug or is it something else that Btrfs merely is exposing? https://bugzilla.redhat.com/show_bug.cgi?id=1733388 I've seen a variation of this splat since kernel 5.0.0 so it doesn't seem like a new issue and I haven't experienced any deadlocks. So I'm a little skeptical that this is just now causing only installs to hang on just one distribution. But there's no clear evidence why the hang happens. Just this suspicious lockdep warning pointing the finger at Btrfs. If it's not Btrfs, it would be useful to know that Fedora folks need to keep looking for the actual problem even though the hangs don't happen on ext4 or XFS. 5.2rc2 https://lore.kernel.org/linux-btrfs/CAJCQCtS4PRWU=QUY87FRd4uGE_wA+KSSLW+2e_9XDs5m+RYzsQ@xxxxxxxxxxxxxx/ 5.0.0rc6 https://lore.kernel.org/linux-btrfs/CAJCQCtTAiLK8rcs+MtzkSAGRwmSDvZN52XaMyemCH4O_4VQ1zQ@xxxxxxxxxxxxxx/ -- Chris Murphy
