MHVTL kernel module and lockdep

[Bart Van Assche]

Hello,

Has anyone been trying to load the mhvtl kernel module on a kernel built with lockdep enabled ? This is the output I got:

INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
Pid: 3626, comm: vtltape Not tainted 2.6.38.7-scst-debug #1
Call Trace:
[<ffffffff8108bc76>] ? __lock_acquire+0xa16/0x1ce0
[<ffffffff813f2465>] ? _raw_spin_lock_irqsave+0x25/0x90
[<ffffffff811242e4>] ? check_object+0xb4/0x270
[<ffffffff8112347b>] ? init_object+0x4b/0x90
[<ffffffff8108d555>] ? lock_acquire+0x85/0x130
[<ffffffffa02ff88f>] ? q_cmd+0x6f/0x410 [mhvtl]
[<ffffffff813f2465>] ? _raw_spin_lock_irqsave+0x25/0x90
[<ffffffff812ad9f0>] ? scsi_done+0x0/0x90
[<ffffffff813f2492>] ? _raw_spin_lock_irqsave+0x52/0x90
[<ffffffffa02ff88f>] ? q_cmd+0x6f/0x410 [mhvtl]
[<ffffffff812ad9f0>] ? scsi_done+0x0/0x90
[<ffffffff812ad9f0>] ? scsi_done+0x0/0x90
[<ffffffffa02ff88f>] ? q_cmd+0x6f/0x410 [mhvtl]
[<ffffffff812ad9f0>] ? scsi_done+0x0/0x90
[<ffffffff813ee73e>] ? printk+0x41/0x43
[<ffffffffa02ffd56>] ? vtl_queuecommand+0x36/0x3c0 [mhvtl]
[<ffffffff812ad9f0>] ? scsi_done+0x0/0x90
[<ffffffffa02ffe3a>] ? vtl_queuecommand+0x11a/0x3c0 [mhvtl]
[<ffffffff81087ef9>] ? trace_hardirqs_off_caller+0x29/0xc0
[<ffffffff8108de8b>] ? mark_held_locks+0x6b/0xa0
[<ffffffff813f2f50>] ? _raw_spin_unlock_irq+0x30/0x60
[<ffffffff812ae1ae>] ? scsi_dispatch_cmd+0x13e/0x340
[<ffffffff812b5077>] ? scsi_request_fn+0x3b7/0x4b0
[<ffffffff811c471a>] ? __generic_unplug_device+0x3a/0x50
[<ffffffff811c9288>] ? blk_execute_rq_nowait+0x68/0xb0
[<ffffffff811c93ed>] ? blk_execute_rq+0x11d/0x1b0
[<ffffffff811266d8>] ? __kmalloc+0xa8/0x1c0
[<ffffffff8108e00d>] ? trace_hardirqs_on_caller+0x14d/0x190
[<ffffffff8108e05d>] ? trace_hardirqs_on+0xd/0x10
[<ffffffff812b4b8c>] ? scsi_execute+0xfc/0x160
[<ffffffff812b535f>] ? scsi_execute_req+0xbf/0x130
[<ffffffff812b7114>] ? scsi_probe_and_add_lun+0x234/0xc80
[<ffffffff8108de8b>] ? mark_held_locks+0x6b/0xa0
[<ffffffff813f01b9>] ? mutex_lock_nested+0x299/0x3c0
[<ffffffff812b8989>] ? __scsi_add_device+0xa9/0x110
[<ffffffff8108de8b>] ? mark_held_locks+0x6b/0xa0
[<ffffffff812b89ea>] ? __scsi_add_device+0x10a/0x110
[<ffffffffa02fe472>] ? vtl_add_lu_action+0x222/0x3c0 [mhvtl]
[<ffffffff8100ba19>] ? native_sched_clock+0x29/0x80
[<ffffffff8107d4cf>] ? local_clock+0x4f/0x60
[<ffffffff81087ef9>] ? trace_hardirqs_off_caller+0x29/0xc0
[<ffffffff8108b687>] ? __lock_acquire+0x427/0x1ce0
[<ffffffff81049c19>] ? sub_preempt_count+0xa9/0xe0
[<ffffffff81087fee>] ? put_lock_stats.clone.14+0xe/0x40
[<ffffffff8108d24f>] ? lock_release_non_nested+0x30f/0x350
[<ffffffff8108de8b>] ? mark_held_locks+0x6b/0xa0
[<ffffffff813f01b9>] ? mutex_lock_nested+0x299/0x3c0
[<ffffffff8119471d>] ? sysfs_write_file+0xcd/0x170
[<ffffffff8129ed7c>] ? drv_attr_store+0x2c/0x30
[<ffffffff81194736>] ? sysfs_write_file+0xe6/0x170
[<ffffffff8112d04e>] ? vfs_write+0xce/0x170
[<ffffffff8112d354>] ? sys_write+0x54/0xa0
[<ffffffff81002f2b>] ? system_call_fastpath+0x16/0x1b

[Mark Harvey]

Thanks (I think )

Now to attempt to grok it...

Any tips on what it's trying to tell me.

Cheers
Mark

[crippa.andrea]

Bart Van Assche wrote

Hello,

Has anyone been trying to load the mhvtl kernel module on a kernel built with lockdep enabled ? This is the output I got:

Hello,
how t do some test ?

My kernel have CONFIG_LOCKDEP_SUPPORT=y , is this that you mean ?

Crippa Andrea

[Bart Van Assche]

On Wed, Jul 6, 2011 at 12:31 PM, crippa.andrea [via MHVTL - Linux Virtual Tape Library - Community Forums] <[hidden email]> wrote:

Bart Van Assche wrote:

Hello,

Has anyone been trying to load the mhvtl kernel module on a kernel built with lockdep enabled ? This is the output I got:

Hello,
how t do some test ?

My kernel have CONFIG_LOCKDEP_SUPPORT=y , is this that you mean ?

I was referring to CONFIG_PROVE_LOCKING=y.

Bart.

[Bart Van Assche]

On Tue, Jul 5, 2011 at 11:45 PM, Mark Harvey [via MHVTL - Linux Virtual Tape Library - Community Forums] <[hidden email]> wrote:

Thanks (I think )

Now to attempt to grok it...

Any tips on what it's trying to tell me.

Is the result of a grep for STATIC_LOCKDEP_MAP_INIT through the Linux kernel tree sufficient information for you to fix this ?

Bart.

[Mark Harvey]

I shall see what a grep -R STATIC_LOCKDEP_MAP_INIT gives me..

I'm away from a real computer for a week or so (working on retaining wall at home)

I'll visit it all early next week,

Thanks

Sent from my iPad

On Jul 6, 2011, at 20:52, "Bart Van Assche [via MHVTL - Linux Virtual Tape Library - CommunityForums]" <[hidden email]> wrote:

On Tue, Jul 5, 2011 at 11:45 PM, Mark Harvey [via MHVTL - Linux Virtual Tape Library - Community Forums] <[hidden email]> wrote:

Thanks (I think )

Now to attempt to grok it...

Any tips on what it's trying to tell me.

Is the result of a grep for STATIC_LOCKDEP_MAP_INIT through the Linux kernel tree sufficient information for you to fix this ?

Bart.

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