On Tue, 09 Mar 2010 03:46:10 -0500
Valdis.Kletnieks@xxxxxx wrote:
> Seen in my dmesg. Appears to have started in 2.6.33-rc7-mmotm0210, I can't
> remember if I reported it before or not...
>
> [ 0.212297] ACPI: Using IOAPIC for interrupt routing
> [ 0.340075]
> [ 0.340076] =============================================
> [ 0.340241] [ INFO: possible recursive locking detected ]
> [ 0.340330] 2.6.33-mmotm0304 #5
> [ 0.340415] ---------------------------------------------
> [ 0.340504] swapper/1 is trying to acquire lock:
> [ 0.340591] (&dev->mutex){+.+...}, at: [<ffffffff812fddfd>] __driver_attach+0x47/0x80
> [ 0.340926]
> [ 0.340927] but task is already holding lock:
> [ 0.340999] (&dev->mutex){+.+...}, at: [<ffffffff812fddef>] __driver_attach+0x39/0x80
> [ 0.340999]
> [ 0.340999] other info that might help us debug this:
> [ 0.340999] 1 lock held by swapper/1:
> [ 0.340999] #0: (&dev->mutex){+.+...}, at: [<ffffffff812fddef>] __driver_attach+0x39/0x80
> [ 0.340999]
> [ 0.340999] stack backtrace:
> [ 0.340999] Pid: 1, comm: swapper Not tainted 2.6.33-mmotm0304 #5
> [ 0.340999] Call Trace:
> [ 0.340999] [<ffffffff810645e7>] __lock_acquire+0xc74/0xceb
> [ 0.340999] [<ffffffff81062a4f>] ? mark_lock+0x2d/0x22c
> [ 0.340999] [<ffffffff812fddfd>] ? __driver_attach+0x47/0x80
> [ 0.340999] [<ffffffff81064753>] lock_acquire+0xf5/0x112
> [ 0.340999] [<ffffffff812fddfd>] ? __driver_attach+0x47/0x80
> [ 0.340999] [<ffffffff81062ca0>] ? mark_held_locks+0x52/0x70
> [ 0.340999] [<ffffffff81581bb5>] __mutex_lock_common+0x5c/0x5aa
> [ 0.340999] [<ffffffff812fddfd>] ? __driver_attach+0x47/0x80
> [ 0.340999] [<ffffffff81571004>] ? klist_next+0x24/0xd7
> [ 0.340999] [<ffffffff812fddfd>] ? __driver_attach+0x47/0x80
> [ 0.340999] [<ffffffff812fddb6>] ? __driver_attach+0x0/0x80
> [ 0.340999] [<ffffffff815821a9>] mutex_lock_nested+0x34/0x39
> [ 0.340999] [<ffffffff812fddfd>] __driver_attach+0x47/0x80
> [ 0.340999] [<ffffffff812fddb6>] ? __driver_attach+0x0/0x80
> [ 0.340999] [<ffffffff812fddb6>] ? __driver_attach+0x0/0x80
> [ 0.340999] [<ffffffff812fd31f>] bus_for_each_dev+0x54/0x89
> [ 0.340999] [<ffffffff812fdb66>] driver_attach+0x19/0x1b
> [ 0.340999] [<ffffffff812fd7b1>] bus_add_driver+0xb4/0x203
> [ 0.340999] [<ffffffff812fe10f>] driver_register+0xb8/0x129
> [ 0.340999] [<ffffffff8123af12>] acpi_bus_register_driver+0x3e/0x40
> [ 0.340999] [<ffffffff81b4aaa4>] acpi_ec_init+0x37/0x55
> [ 0.340999] [<ffffffff81b4a920>] acpi_init+0x101/0x116
> [ 0.340999] [<ffffffff81b4a81f>] ? acpi_init+0x0/0x116
> [ 0.340999] [<ffffffff810001ef>] do_one_initcall+0x59/0x14e
> [ 0.340999] [<ffffffff81b2c687>] kernel_init+0x14d/0x1d7
> [ 0.340999] [<ffffffff810033d4>] kernel_thread_helper+0x4/0x10
> [ 0.340999] [<ffffffff81584040>] ? restore_args+0x0/0x30
> [ 0.340999] [<ffffffff81b2c53a>] ? kernel_init+0x0/0x1d7
> [ 0.340999] [<ffffffff810033d0>] ? kernel_thread_helper+0x0/0x10
> [ 0.341046] ACPI: EC: GPE = 0x11, I/O: command/status = 0x934, data = 0x930
>
<looks at mainline's 8e9394ce2412254ec69fd2a4f3e44a66eade2297>
In the future, we are going to be changing the lock type for struct
device (once we get the lockdep infrastructure properly worked out)
<looks at linux-next's "drivers/base: Convert dev->sem to mutex">
Seems that the latter patch (from Greg and Thomas) went and did the
mutex conversion before "we got the lockdep infrastructure properly
worked out".
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