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Message-ID: <a8e1da0801132305s4f0c3d7asa268382bb6e44777@mail.gmail.com>
Date: Mon, 14 Jan 2008 15:05:19 +0800
From: "Dave Young" <hidave.darkstar@gmail.com>
To: "Gabor Gombas" <gombasg@sztaki.hu>
Subject: Re: [Bluez-devel] Oops involving RFCOMM and sysfs
Cc: "Tejun Heo" <htejun@gmail.com>, "Al Viro" <viro@zeniv.linux.org.uk>,
       linux-kernel@vger.kernel.org, bluez-devel@lists.sourceforge.net,
       kay.sievers@vrfy.org, "Greg KH" <greg@kroah.com>,
       "Marcel Holtmann" <marcel@holtmann.org>, davem@davemloft.net
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On Jan 12, 2008 7:09 AM, Gabor Gombas <gombasg@sztaki.hu> wrote:
> On Thu, Jan 10, 2008 at 09:11:17AM +0800, Dave Young wrote:
>
> > For bluetooth device_move, the only child device of hci_conn dev is
> > the rfcomm tty_dev. How about the following patch, please verify :
>
> There is now no oops, instead the keyboard becomes almost completely
> unresponsible when I switch off & on the phone. The mouse still works
> (tested both with X and with the VGA console), but terminal input and VT
> switching is dead. On the VGA console, even scrolling using Shift+PgUp
> stops working.
>
> Alt+SysRq+w works, trace is below. Ctrl+Alt+Del also works, but then
> init complains about hung processes and that it can not umount the file
> systems and cannot stop the RAID arrays. Once it still rebooted though,
> the second time it got hung after trying to umount the filesystems, and
> I had to use Alt+SysRq+b.
>
> If I can choose then I prefer the Oops...
>
> Jan 11 23:46:35 twister kernel: SysRq : Emergency Sync
> Jan 11 23:46:35 twister kernel: Emergency Sync complete
> Jan 11 23:46:42 twister kernel: SysRq : Show Blocked State
> Jan 11 23:46:42 twister kernel:   task                        PC stack   pid father
> Jan 11 23:46:42 twister kernel: events/0      D ffffffff80487190     0     5      2
> Jan 11 23:46:42 twister kernel:  ffff8100bf84fd40 0000000000000046 ffff8100ae7f2600 ffff8100bf84fd00
> Jan 11 23:46:42 twister kernel:  ffff8100bf84a830 ffff8100bd872000 ffffffff80652ae0 0000000100000100
> Jan 11 23:46:42 twister kernel:  0000000000000000 7fffffffffffffff 7fffffffffffffff 0000000000000002
> Jan 11 23:46:42 twister kernel: Call Trace:
> Jan 11 23:46:42 twister kernel:  [<ffffffff80473543>] schedule_timeout+0x1e/0xad
> Jan 11 23:46:42 twister kernel:  [<ffffffff8028560d>] dput+0x26/0x103
> Jan 11 23:46:42 twister kernel:  [<ffffffff802af3fd>] sysfs_move_dir+0x1ee/0x1fd
> Jan 11 23:46:42 twister kernel:  [<ffffffff8047340b>] wait_for_common+0xc4/0x129
> Jan 11 23:46:42 twister kernel:  [<ffffffff80224204>] default_wake_function+0x0/0xe
> Jan 11 23:46:42 twister kernel:  [<ffffffff80471d72>] klist_del+0x15/0x2e
> Jan 11 23:46:42 twister kernel:  [<ffffffff803698f3>] device_move+0x80/0x111
> Jan 11 23:46:42 twister kernel:  [<ffffffff88146a27>] :bluetooth:hci_conn_move_child+0x0/0xf
> Jan 11 23:46:42 twister kernel:  [<ffffffff88146a32>] :bluetooth:hci_conn_move_child+0xb/0xf
> Jan 11 23:46:42 twister kernel:  [<ffffffff80369836>] device_for_each_child+0x22/0x4d
> Jan 11 23:46:42 twister kernel:  [<ffffffff88146a05>] :bluetooth:del_conn+0x0/0x22
> Jan 11 23:46:42 twister kernel:  [<ffffffff88146a1e>] :bluetooth:del_conn+0x19/0x22
> Jan 11 23:46:42 twister kernel:  [<ffffffff8023696d>] run_workqueue+0x74/0xee
> Jan 11 23:46:42 twister kernel:  [<ffffffff80236ff8>] worker_thread+0x0/0xe7
> Jan 11 23:46:42 twister kernel:  [<ffffffff802370d2>] worker_thread+0xda/0xe7
> Jan 11 23:46:42 twister kernel:  [<ffffffff80239b77>] autoremove_wake_function+0x0/0x2e
> Jan 11 23:46:42 twister kernel:  [<ffffffff80236ff8>] worker_thread+0x0/0xe7
> Jan 11 23:46:42 twister kernel:  [<ffffffff802399a0>] kthread+0x47/0x73
> Jan 11 23:46:42 twister kernel:  [<ffffffff8020bdc8>] child_rip+0xa/0x12
> Jan 11 23:46:42 twister kernel:  [<ffffffff80239959>] kthread+0x0/0x73
> Jan 11 23:46:42 twister kernel:  [<ffffffff8020bdbe>] child_rip+0x0/0x12
> Jan 11 23:46:42 twister kernel:
> Jan 11 23:46:42 twister kernel: cat           D 7fffffffffffffff     0  3978   3965
> Jan 11 23:46:42 twister kernel:  ffff81009e857ce8 0000000000000086 ffff8100ae7f2900 ffff81009e857ca8
> Jan 11 23:46:42 twister kernel:  ffff8100bd872000 ffff8100bf9e7060 ffffffff80652ae0 00000001000000c0
> Jan 11 23:46:42 twister kernel:  0000000000000000 7fffffffffffffff 7fffffffffffffff 0000000000000002
> Jan 11 23:46:42 twister kernel: Call Trace:
> Jan 11 23:46:42 twister kernel:  [<ffffffff80473543>] schedule_timeout+0x1e/0xad
> Jan 11 23:46:42 twister kernel:  [<ffffffff80223ccc>] __dequeue_entity+0x1c/0x32
> Jan 11 23:46:42 twister kernel:  [<ffffffff80223d05>] set_next_entity+0x23/0x73
> Jan 11 23:46:42 twister kernel:  [<ffffffff8047340b>] wait_for_common+0xc4/0x129
> Jan 11 23:46:42 twister kernel:  [<ffffffff80224204>] default_wake_function+0x0/0xe
> Jan 11 23:46:42 twister kernel:  [<ffffffff80236b02>] flush_cpu_workqueue+0x50/0x58
> Jan 11 23:46:42 twister kernel:  [<ffffffff80236c32>] wq_barrier_func+0x0/0x9
> Jan 11 23:46:42 twister kernel:  [<ffffffff80236ecf>] flush_workqueue+0x9/0x12
> Jan 11 23:46:42 twister kernel:  [<ffffffff803449f9>] release_dev+0x47c/0x5e2
> Jan 11 23:46:42 twister kernel:  [<ffffffff8021b609>] do_page_fault+0x2ff/0x65a
> Jan 11 23:46:42 twister kernel:  [<ffffffff80344b6b>] tty_release+0xc/0x10
> Jan 11 23:46:42 twister kernel:  [<ffffffff80277013>] __fput+0xb1/0x16f
> Jan 11 23:46:42 twister kernel:  [<ffffffff80274961>] filp_close+0x5d/0x65
> Jan 11 23:46:42 twister kernel:  [<ffffffff80275ab3>] sys_close+0x73/0xa6
> Jan 11 23:46:42 twister kernel:  [<ffffffff8020b5fc>] tracesys+0xdc/0xe1
> Jan 11 23:46:42 twister kernel:
>
> If I'm not mistaken the "cat" above is the "cat /dev/zero >
> /dev/rfcomm0" command.
>

Any idea about this?

Add marcel and davem in cc-list.

>
> Gabor
>
> --
>      ---------------------------------------------------------
>      MTA SZTAKI Computer and Automation Research Institute
>                 Hungarian Academy of Sciences
>      ---------------------------------------------------------
>
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