Processes keep getting stuck in btrfs_evict_inode during unlink. I've seen this dozens of times, usually when two subvols on a btrfs filesystem are active at the same time (i.e. it never happens on single-subvol filesystems). It happens on kernel versions v3.15..v3.18.3. This used to happen with SyS_renameat2 on the stack, but I haven't seen a stack trace including that function since late November (v3.18-rc6). [<ffffffff81387dc0>] lock_extent_bits+0x1b0/0x200 [<ffffffff81375e99>] btrfs_evict_inode+0x139/0x550 [<ffffffff8120d708>] evict+0xb8/0x190 [<ffffffff8120dec5>] iput+0x105/0x1a0 [<ffffffff812001d9>] do_unlinkat+0x189/0x2d0 [<ffffffff81202e26>] SyS_unlink+0x16/0x20 [<ffffffff8185e96d>] system_call_fastpath+0x1a/0x1f [<ffffffffffffffff>] 0xffffffffffffffff
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