Ceph » Linux kernel client

This happened when lockdep was turned on:

2012-01-10T12:56:12.785388-08:00 sepia54 kernel: [ 3536.845746] rbd: loaded rbd (rados block device)
2012-01-10T12:56:13.035381-08:00 sepia54 kernel: [ 3537.098259] libceph: client0 fsid 9466bc62-f527-4ee6-b3f4-f7c75aa6e6eb
2012-01-10T12:56:13.035408-08:00 sepia54 kernel: [ 3537.099716] libceph: mon2 10.3.14.183:6789 session established
2012-01-10T12:56:13.035520-08:00 sepia54 kernel: [ 3537.099884] INFO: trying to register non-static key.
2012-01-10T12:56:13.201443-08:00 sepia54 kernel: [ 3537.104915] the code is fine but needs lockdep annotation.
2012-01-10T12:56:13.201455-08:00 sepia54 kernel: [ 3537.109706] turning off the locking correctness validator.
2012-01-10T12:56:13.201564-08:00 sepia54 kernel: [ 3537.109706] Pid: 23848, comm: rbd Not tainted 3.2.0-ceph-00011-g35a3324 #1
2012-01-10T12:56:13.201623-08:00 sepia54 kernel: [ 3537.109706] Call Trace:
2012-01-10T12:56:13.201680-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffff8109cebf>] register_lock_class+0x24f/0x4b0
2012-01-10T12:56:13.201789-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffff8109f5b9>] __lock_acquire+0x99/0x15d0
2012-01-10T12:56:13.201797-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffff81123b28>] ? __alloc_pages_nodemask+0x128/0x7d0
2012-01-10T12:56:13.201806-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffff8109e94f>] ? check_irq_usage+0x9f/0xf0
2012-01-10T12:56:13.201812-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffffa00d3bb6>] ? rbd_do_request+0xa6/0x3b0 [rbd]
2012-01-10T12:56:13.201816-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffff810a10e2>] lock_acquire+0xa2/0x120
2012-01-10T12:56:13.201821-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffffa00d3bb6>] ? rbd_do_request+0xa6/0x3b0 [rbd]
2012-01-10T12:56:13.201826-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffff8109ffac>] ? __lock_acquire+0xa8c/0x15d0
2012-01-10T12:56:13.201835-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffff816048e9>] down_read+0x39/0x50
2012-01-10T12:56:13.201840-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffffa00d3bb6>] ? rbd_do_request+0xa6/0x3b0 [rbd]
2012-01-10T12:56:13.201846-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffffa00d3bb6>] rbd_do_request+0xa6/0x3b0 [rbd]
2012-01-10T12:56:13.201851-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffffa00d4021>] T.953+0xe1/0x1b0 [rbd]
2012-01-10T12:56:13.201860-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffffa00d418c>] rbd_read_header+0x9c/0x330 [rbd]
2012-01-10T12:56:13.201869-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffffa00d5e0b>] rbd_add+0x58b/0xd88 [rbd]
2012-01-10T12:56:13.201874-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffff811eb5fd>] ? sysfs_write_file+0xcd/0x170
2012-01-10T12:56:13.201879-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffff813e0487>] bus_attr_store+0x27/0x30
2012-01-10T12:56:13.201888-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffff811eb616>] sysfs_write_file+0xe6/0x170
2012-01-10T12:56:13.201903-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffff811763f8>] vfs_write+0xc8/0x190
2012-01-10T12:56:13.201909-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffff811765b1>] sys_write+0x51/0x90
2012-01-10T12:56:13.201914-08:00 sepia54 kernel: [ 3537.109706]  [<ffffffff8160e1c2>] system_call_fastpath+0x16/0x1b