When I upgrade to the 3.19.2 Kernel I get a deadlocked boot: INFO: task mount:302 blocked for more than 120 seconds. INFO: task btrfs-transacti:329 blocked for more than 120 seconds.
I had a similar behavior today after I accidentally pulled the power plug of my machine (Arch Linux, Kernel 3.19.2). I tried to boot several times, but "mount" timed out. I booted into a recovery Arch Linux with a 3.18 kernel and my root filesystem mounted without any problems. Unmounted, ran btrfs check, no errors. After reboot, the filesystem mounted normally with 3.19.2 again! I tried to reproduce this behavior on another machine, but so far to no avail.
I'm afraid I wasn't able to gather more debug info. Some more general info: I'm using btrfs on top of dm-crypt (LUKS), my root is on a SSD, and I'm using rw,noatime,ssd,discard,space_cache as mount options.
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