On Tue, Jan 22, 2019 at 11:03 AM Eli V <eliventer@xxxxxxxxx> wrote: > > On Tue, Jan 22, 2019 at 10:42 AM Filipe Manana <fdmanana@xxxxxxxxx> wrote: > > > > On Tue, Jan 22, 2019 at 3:26 PM Eli V <eliventer@xxxxxxxxx> wrote: > > > > > > I seem to have it a deadlock trying out btrfs send & receive. Now I > > > haven't used btrfs send & receive much, so don't have much experience > > > with them. Anyways, bug report and stack traces: > > > https://bugzilla.kernel.org/show_bug.cgi?id=202383 > > > > This is the same you reported at: > > https://bugzilla.kernel.org/show_bug.cgi?id=199753 > > > > It just happens through a different path, unrelated to send/receive. > > You are running a 4.19.16 kernel, which doesn't have the fix [1]: > > > > $ git tag --contains 5ce555578e0919237fa4bda92b4670e2dd176f85 > > v4.20 > > v4.20-rc1 > > v4.20-rc2 > > v4.20-rc3 > > v4.20-rc4 > > v4.20-rc5 > > v4.20-rc6 > > v4.20-rc7 > > v4.20.1 > > v4.20.2 > > v4.20.3 > > v5.0-rc1 > > v5.0-rc2 > > v5.0-rc3 > > > > All the deadlock problems you reported are fixed by [1] and [2]. > > The second, related to the free space tree, is very recent and only on 5.0-rcs: > > > > $ git tag --contains a6d8654d885d7d79a3fb82da64eaa489ca332a82 > > v5.0-rc2 > > v5.0-rc3 > > > > [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5ce555578e0919237fa4bda92b4670e2dd176f85 > > [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a6d8654d885d7d79a3fb82da64eaa489ca332a82 > > Hmm, as far as I can tell these are both already in 4.19.16, according to the linux-stable git repo as: d7068618ae1fbb80fc16bd7c58798e208a696483 ea9c846f54dbf03da159a1b7566aa95e9bf1674b So I guess that would mean the btrfs receive deadlock i.e. kernel bugzilla 202383, isn't fixed by these commits. > > Sounds good, thanks for the links. I thought the stack traces looked > different, thus the 2 different reports. I guess no further info is > needed from the hung tasks and I can start killing it and figuring out > how to resume the process. > > > > > > > > Seems like the receive is hung as well as several kworkers. It's about > > > 1.2TB into a 9TB or so transfer onto a brand new pretty empty fs. This > > > is just a btrfs send snapshot, not an incremental. That was supposed > > > to come next. If this was an rsync based backup I'd just kill the > > > rsync process and restart it, not sure if there's a way to restart a > > > btrfs send receive, or if I'd have to delete the partially created > > > snapshot on the destination and restart the send. I guess I could just > > > use rsync to finish the copy of the initial snapshot as well before > > > using send | receive for the incrementals. Thoughts and options would > > > be appreciated, thanks. > > > > > > -Eli > > > > > > > > -- > > Filipe David Manana, > > > > “Whether you think you can, or you think you can't — you're right.”
