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
signature.asc
Description: Digital signature
