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SubjectRe: Call Trace:Re: [boot crash #2] Re: [GIT PULL] SLAB changes for v2.6.39-rc1

* Thomas Gleixner <tglx@linutronix.de> wrote:

> After we made debugobjects working again, we got the following:
>
> WARNING: at lib/debugobjects.c:262 debug_print_object+0x8e/0xb0()
> Hardware name: System Product Name
> ODEBUG: free active (active state 0) object type: timer_list hint: hci_cmd_timer+0x0/0x60
> Pid: 2125, comm: dmsetup Tainted: G W 2.6.38-06707-gc62b389 #110375
> Call Trace:
> [<ffffffff8104700a>] warn_slowpath_common+0x7a/0xb0
> [<ffffffff810470b6>] warn_slowpath_fmt+0x46/0x50
> [<ffffffff812d3a5e>] debug_print_object+0x8e/0xb0
> [<ffffffff81bd8810>] ? hci_cmd_timer+0x0/0x60
> [<ffffffff812d4685>] debug_check_no_obj_freed+0x125/0x230
> [<ffffffff810f1063>] ? check_object+0xb3/0x2b0
> [<ffffffff810f3630>] kfree+0x150/0x190
> [<ffffffff81be4d06>] ? bt_host_release+0x16/0x20
> [<ffffffff81be4d06>] bt_host_release+0x16/0x20
> [<ffffffff813a1907>] device_release+0x27/0xa0
> [<ffffffff812c519c>] kobject_release+0x4c/0xa0
> [<ffffffff812c5150>] ? kobject_release+0x0/0xa0
> [<ffffffff812c61f6>] kref_put+0x36/0x70
> [<ffffffff812c4d37>] kobject_put+0x27/0x60
> [<ffffffff813a21f7>] put_device+0x17/0x20
> [<ffffffff81bda4f9>] hci_free_dev+0x29/0x30
> [<ffffffff81928be6>] vhci_release+0x36/0x70
> [<ffffffff810fb366>] fput+0xd6/0x1f0
> [<ffffffff810f8fe6>] filp_close+0x66/0x90
> [<ffffffff810f90a9>] sys_close+0x99/0xf0
> [<ffffffff81d4c96b>] system_call_fastpath+0x16/0x1b
>
> That timer was introduced with commit 6bd32326cda(Bluetooth: Use
> proper timer for hci command timout)
>
> Timer seems to be running when the thing is closed. Removing the timer
> unconditionally fixes the problem. And yes, it needs to be fixed
> before the HCI_UP check.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> ---
> net/bluetooth/hci_core.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> Index: linux-2.6/net/bluetooth/hci_core.c
> ===================================================================
> --- linux-2.6.orig/net/bluetooth/hci_core.c
> +++ linux-2.6/net/bluetooth/hci_core.c
> @@ -584,6 +584,9 @@ static int hci_dev_do_close(struct hci_d
> hci_req_cancel(hdev, ENODEV);
> hci_req_lock(hdev);
>
> + /* Stop timer, it might be running */
> + del_timer_sync(&hdev->cmd_timer);
> +
> if (!test_and_clear_bit(HCI_UP, &hdev->flags)) {
> hci_req_unlock(hdev);
> return 0;
> @@ -623,7 +626,6 @@ static int hci_dev_do_close(struct hci_d
>
> /* Drop last sent command */
> if (hdev->sent_cmd) {
> - del_timer_sync(&hdev->cmd_timer);
> kfree_skb(hdev->sent_cmd);
> hdev->sent_cmd = NULL;
> }

Yes, this fixes the warning.

Tested-by: Ingo Molnar <mingo@elte.hu>

Thanks,

Ingo


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