Commits
Liu Bo committed a9d2d4adb6a
Btrfs: fix a lockdep warning when cleaning up aborted transaction Given now we have 2 spinlock for management of delayed refs, CONFIG_DEBUG_SPINLOCK=y helped me find this, [ 4723.413809] BUG: spinlock wrong CPU on CPU#1, btrfs-transacti/2258 [ 4723.414882] lock: 0xffff880048377670, .magic: dead4ead, .owner: btrfs-transacti/2258, .owner_cpu: 2 [ 4723.417146] CPU: 1 PID: 2258 Comm: btrfs-transacti Tainted: G W O 3.12.0+ #4 [ 4723.421321] Call Trace: [ 4723.421872] [<ffffffff81680fe7>] dump_stack+0x54/0x74 [ 4723.422753] [<ffffffff81681093>] spin_dump+0x8c/0x91 [ 4723.424979] [<ffffffff816810b9>] spin_bug+0x21/0x26 [ 4723.425846] [<ffffffff81323956>] do_raw_spin_unlock+0x66/0x90 [ 4723.434424] [<ffffffff81689bf7>] _raw_spin_unlock+0x27/0x40 [ 4723.438747] [<ffffffffa015da9e>] btrfs_cleanup_one_transaction+0x35e/0x710 [btrfs] [ 4723.443321] [<ffffffffa015df54>] btrfs_cleanup_transaction+0x104/0x570 [btrfs] [ 4723.444692] [<ffffffff810c1b5d>] ? trace_hardirqs_on_caller+0xfd/0x1c0 [ 4723.450336] [<ffffffff810c1c2d>] ? trace_hardirqs_on+0xd/0x10 [ 4723.451332] [<ffffffffa015e5ee>] transaction_kthread+0x22e/0x270 [btrfs] [ 4723.452543] [<ffffffffa015e3c0>] ? btrfs_cleanup_transaction+0x570/0x570 [btrfs] [ 4723.457833] [<ffffffff81079efa>] kthread+0xea/0xf0 [ 4723.458990] [<ffffffff81079e10>] ? kthread_create_on_node+0x140/0x140 [ 4723.460133] [<ffffffff81692aac>] ret_from_fork+0x7c/0xb0 [ 4723.460865] [<ffffffff81079e10>] ? kthread_create_on_node+0x140/0x140 [ 4723.496521] ------------[ cut here ]------------ ---------------------------------------------------------------------- The reason is that we get to call cond_resched_lock(&head_ref->lock) while still holding @delayed_refs->lock. So it's different with __btrfs_run_delayed_refs(), where we do drop-acquire dance before and after actually processing delayed refs. Here we don't drop the lock, others are not able to add new delayed refs to head_ref, so cond_resched_lock(&head_ref->lock) is not necessary here. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: Chris Mason <clm@fb.com>