Below is the only lockdep warning that I've seen.. I've booted a number
of machines without warning displayed, but one consistently has this.
I think it's due to a repeated release/re-lock of the interpreter mutex.
Where the interpreter mutex can be re-locked anyplace inside an AML
Mutex lock sequence.
Daniel
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.26 #7
-------------------------------------------------------
swapper/1 is trying to acquire lock:
(key#5){--..}, at: [<c039d0ee>] acpi_os_acquire_mutex_nested+0x29/0x3f
but task is already holding lock:
(key#6){--..}, at: [<c039d0ee>] acpi_os_acquire_mutex_nested+0x29/0x3f
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (key#6){--..}:
[<c024a29a>] __lock_acquire+0xbba/0x10d0
[<c024a810>] lock_acquire+0x60/0x80
[<c05622b3>] mutex_lock_interruptible_nested+0x93/0x340
[<c039d0ee>] acpi_os_acquire_mutex_nested+0x29/0x3f
[<c03a74cd>] acpi_ex_system_wait_mutex_nested+0x11/0x3b
[<c03a8f92>] acpi_ex_acquire_mutex_object+0x3f/0x5b
[<c03a903f>] acpi_ex_acquire_mutex+0x91/0xe6
[<c03a7f60>] acpi_ex_opcode_2A_0T_1R+0xb4/0x130
[<c039f4ab>] acpi_ds_exec_end_op+0xe6/0x373
[<c03adba5>] acpi_ps_parse_loop+0x5cd/0x720
[<c03acfd8>] acpi_ps_parse_aml+0x6d/0x25b
[<c03ae20d>] acpi_ps_execute_method+0x11c/0x1d7
[<c03ab55a>] acpi_ns_evaluate+0x12e/0x188
[<c03b0b7a>] acpi_ut_evaluate_object+0x51/0x158
[<c03b0cf2>] acpi_ut_execute_STA+0x1d/0x49
[<c03aaf6e>] acpi_ns_get_device_callback+0x59/0x112
[<c03ac5fe>] acpi_ns_walk_namespace+0x9a/0x110
[<c03aae99>] acpi_get_devices+0x47/0x5d
[<c070c8e6>] acpi_ec_ecdt_probe+0x97/0xf7
[<c070c403>] acpi_init+0x76/0x21f
[<c06f638f>] kernel_init+0x19d/0x2b1
[<c0203f13>] kernel_thread_helper+0x7/0x14
[<ffffffff>] 0xffffffff
-> #0 (key#5){--..}:
[<c024a30f>] __lock_acquire+0xc2f/0x10d0
[<c024a810>] lock_acquire+0x60/0x80
[<c05622b3>] mutex_lock_interruptible_nested+0x93/0x340
[<c039d0ee>] acpi_os_acquire_mutex_nested+0x29/0x3f
[<c03b2d8e>] acpi_ut_acquire_mutex+0x33/0x70
[<c03a8d30>] acpi_ex_enter_interpreter+0xa/0x24
[<c03a1bf4>] acpi_ev_address_space_dispatch+0xb8/0x16f
[<c03a59ee>] acpi_ex_access_region+0x1b2/0x1c0
[<c03a5b13>] acpi_ex_field_datum_io+0x117/0x1ae
[<c03a5e67>] acpi_ex_write_with_update_rule+0xd5/0xde
[<c03a6117>] acpi_ex_insert_into_field+0x2a7/0x2c4
[<c03a4789>] acpi_ex_write_data_to_field+0x169/0x181
[<c03a8836>] acpi_ex_store_object_to_node+0x82/0xb7
[<c03a8a04>] acpi_ex_store+0xc9/0x221
[<c03a6a0e>] acpi_ex_opcode_1A_1T_1R+0x3db/0x535
[<c039f4ab>] acpi_ds_exec_end_op+0xe6/0x373
[<c03adba5>] acpi_ps_parse_loop+0x5cd/0x720
[<c03acfd8>] acpi_ps_parse_aml+0x6d/0x25b
[<c03ae20d>] acpi_ps_execute_method+0x11c/0x1d7
[<c03ab55a>] acpi_ns_evaluate+0x12e/0x188
[<c03b0b7a>] acpi_ut_evaluate_object+0x51/0x158
[<c03b0cf2>] acpi_ut_execute_STA+0x1d/0x49
[<c03aaf6e>] acpi_ns_get_device_callback+0x59/0x112
[<c03ac5fe>] acpi_ns_walk_namespace+0x9a/0x110
[<c03aae99>] acpi_get_devices+0x47/0x5d
[<c070c8e6>] acpi_ec_ecdt_probe+0x97/0xf7
[<c070c403>] acpi_init+0x76/0x21f
[<c06f638f>] kernel_init+0x19d/0x2b1
[<c0203f13>] kernel_thread_helper+0x7/0x14
[<ffffffff>] 0xffffffff
other info that might help us debug this:
1 lock held by swapper/1:
#0: (key#6){--..}, at: [<c039d0ee>] acpi_os_acquire_mutex_nested+0x29/0x3f
stack backtrace:
Pid: 1, comm: swapper Not tainted 2.6.26 #7
[<c024946f>] print_circular_bug_tail+0x6f/0x80
[<c024a30f>] __lock_acquire+0xc2f/0x10d0
[<c039cebe>] ? acpi_os_validate_address+0x6b/0x98
[<c024a810>] lock_acquire+0x60/0x80
[<c039d0ee>] ? acpi_os_acquire_mutex_nested+0x29/0x3f
[<c05622b3>] mutex_lock_interruptible_nested+0x93/0x340
[<c039d0ee>] ? acpi_os_acquire_mutex_nested+0x29/0x3f
[<c039d0ee>] ? acpi_os_acquire_mutex_nested+0x29/0x3f
[<c039d0ee>] acpi_os_acquire_mutex_nested+0x29/0x3f
[<c03b2d8e>] acpi_ut_acquire_mutex+0x33/0x70
[<c03a8d30>] acpi_ex_enter_interpreter+0xa/0x24
[<c03a1bf4>] acpi_ev_address_space_dispatch+0xb8/0x16f
[<c03a59ee>] acpi_ex_access_region+0x1b2/0x1c0
[<c03a5b13>] acpi_ex_field_datum_io+0x117/0x1ae
[<c03a5e67>] acpi_ex_write_with_update_rule+0xd5/0xde
[<c03a6117>] acpi_ex_insert_into_field+0x2a7/0x2c4
[<c03a4789>] acpi_ex_write_data_to_field+0x169/0x181
[<c03b29bd>] ? acpi_ut_allocate_object_desc_dbg+0x2c/0x5d
[<c03a8836>] acpi_ex_store_object_to_node+0x82/0xb7
[<c03a8a04>] acpi_ex_store+0xc9/0x221
[<c03a6a0e>] acpi_ex_opcode_1A_1T_1R+0x3db/0x535
[<c03a716c>] ? acpi_ex_resolve_operands+0x1cc/0x47c
[<c039f4ab>] acpi_ds_exec_end_op+0xe6/0x373
[<c03adba5>] acpi_ps_parse_loop+0x5cd/0x720
[<c03acfd8>] acpi_ps_parse_aml+0x6d/0x25b
[<c03ae20d>] acpi_ps_execute_method+0x11c/0x1d7
[<c03ab55a>] acpi_ns_evaluate+0x12e/0x188
[<c03b0b7a>] acpi_ut_evaluate_object+0x51/0x158
[<c03b0cf2>] acpi_ut_execute_STA+0x1d/0x49
[<c039d0c1>] ? acpi_os_release_mutex+0x15/0x19
[<c03aaf6e>] acpi_ns_get_device_callback+0x59/0x112
[<c0562cb8>] ? mutex_unlock+0x8/0x10
[<c03ac5fe>] acpi_ns_walk_namespace+0x9a/0x110
[<c03aae99>] acpi_get_devices+0x47/0x5d
[<c03aaf15>] ? acpi_ns_get_device_callback+0x0/0x112
[<c03b6bdf>] ? ec_parse_device+0x0/0x56
[<c070c8e6>] acpi_ec_ecdt_probe+0x97/0xf7
[<c070c403>] acpi_init+0x76/0x21f
[<c070af87>] ? fbmem_init+0x47/0x89
[<c06f638f>] kernel_init+0x19d/0x2b1
[<c0563e5d>] ? _spin_unlock_irq+0x2d/0x50
[<c070c38d>] ? acpi_init+0x0/0x21f
[<c024908e>] ? trace_hardirqs_on_caller+0xfe/0x140
[<c0341878>] ? trace_hardirqs_on_thunk+0xc/0x10
[<c020333a>] ? restore_nocheck_notrace+0x0/0xe
[<c06f61f2>] ? kernel_init+0x0/0x2b1
[<c06f61f2>] ? kernel_init+0x0/0x2b1
[<c0203f13>] kernel_thread_helper+0x7/0x14
=======================
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
