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From: Larry Finger on 8 Feb 2010 16:00
On 02/08/2010 03:52 AM, Amerigo Wang wrote:
> Similar to the previous PM case, in iosched, we hold an s_active
> lock to store "scheduler", meanwhile we want to remove "iosched/*"
> files.
>
> This patch depends on the previous one. I tested it on my machine,
> it fixes the problem.
>
> Reported-by: Hugh Dickins <hugh.dickins(a)tiscali.co.uk>
> Signed-off-by: WANG Cong <amwang(a)redhat.com>
> Cc: Jens Axboe <jens.axboe(a)oracle.com>

After applying the 2 patches to 2.6.33-rc7, I get the following:

ACPI: bus type pci registered
PCI: MMCONFIG for domain 0000 [bus 00-09] at [mem 0xe0000000-0xe09fffff] (base
0xe0000000)
PCI: MMCONFIG at [mem 0xe0000000-0xe09fffff] reserved in E820
PCI: Using configuration type 1 for base access
INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
Pid: 1, comm: swapper Not tainted 2.6.33-rc7-Linus-00010-g6339204-dirty #181
Call Trace:
[<ffffffff8107c6e6>] __lock_acquire+0xf86/0x1d30
[<ffffffff81078e7f>] ? lockdep_init_map+0x5f/0x5d0
[<ffffffff8107d52b>] lock_acquire+0x9b/0x120
[<ffffffff81167a93>] ? sysfs_addrm_finish+0x43/0x70
[<ffffffff81167243>] sysfs_deactivate+0xc3/0x110
[<ffffffff81167a93>] ? sysfs_addrm_finish+0x43/0x70
[<ffffffff813124d3>] ? mutex_lock_nested+0x243/0x300
[<ffffffff81167a93>] sysfs_addrm_finish+0x43/0x70
[<ffffffff81167af6>] remove_dir+0x36/0x40
[<ffffffff81167b09>] sysfs_remove_subdir+0x9/0x10
[<ffffffff81168ff6>] sysfs_remove_group+0x66/0xf0
[<ffffffff81861555>] param_sysfs_init+0x102/0x277
[<ffffffff8124a5bd>] ? sysdev_create_file+0xd/0x10
[<ffffffff8130fe46>] ? register_cpu+0xa3/0xa5
[<ffffffff81861453>] ? param_sysfs_init+0x0/0x277
[<ffffffff810001d7>] do_one_initcall+0x37/0x190
[<ffffffff8184c6d0>] kernel_init+0x14f/0x1a5
[<ffffffff81003bd4>] kernel_thread_helper+0x4/0x10
[<ffffffff8131417c>] ? restore_args+0x0/0x30
[<ffffffff8184c581>] ? kernel_init+0x0/0x1a5
[<ffffffff81003bd0>] ? kernel_thread_helper+0x0/0x10

This dump does not occur with standard 2.6.33-rc7. As the above turns off the
locking correctness validator, I cannot really test to see what happens when
suspending.

Larry
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From: Cong Wang on 8 Feb 2010 22:00
Larry Finger wrote:
> On 02/08/2010 03:52 AM, Amerigo Wang wrote:
>> Similar to the previous PM case, in iosched, we hold an s_active
>> lock to store "scheduler", meanwhile we want to remove "iosched/*"
>> files.
>>
>> This patch depends on the previous one. I tested it on my machine,
>> it fixes the problem.
>>
>> Reported-by: Hugh Dickins <hugh.dickins(a)tiscali.co.uk>
>> Signed-off-by: WANG Cong <amwang(a)redhat.com>
>> Cc: Jens Axboe <jens.axboe(a)oracle.com>
>
> After applying the 2 patches to 2.6.33-rc7, I get the following:
>
> ACPI: bus type pci registered
> PCI: MMCONFIG for domain 0000 [bus 00-09] at [mem 0xe0000000-0xe09fffff] (base
> 0xe0000000)
> PCI: MMCONFIG at [mem 0xe0000000-0xe09fffff] reserved in E820
> PCI: Using configuration type 1 for base access
> INFO: trying to register non-static key.
> the code is fine but needs lockdep annotation.
> turning off the locking correctness validator.
> Pid: 1, comm: swapper Not tainted 2.6.33-rc7-Linus-00010-g6339204-dirty #181
> Call Trace:
> [<ffffffff8107c6e6>] __lock_acquire+0xf86/0x1d30
> [<ffffffff81078e7f>] ? lockdep_init_map+0x5f/0x5d0
> [<ffffffff8107d52b>] lock_acquire+0x9b/0x120
> [<ffffffff81167a93>] ? sysfs_addrm_finish+0x43/0x70
> [<ffffffff81167243>] sysfs_deactivate+0xc3/0x110
> [<ffffffff81167a93>] ? sysfs_addrm_finish+0x43/0x70
> [<ffffffff813124d3>] ? mutex_lock_nested+0x243/0x300
> [<ffffffff81167a93>] sysfs_addrm_finish+0x43/0x70
> [<ffffffff81167af6>] remove_dir+0x36/0x40
> [<ffffffff81167b09>] sysfs_remove_subdir+0x9/0x10
> [<ffffffff81168ff6>] sysfs_remove_group+0x66/0xf0
> [<ffffffff81861555>] param_sysfs_init+0x102/0x277
> [<ffffffff8124a5bd>] ? sysdev_create_file+0xd/0x10
> [<ffffffff8130fe46>] ? register_cpu+0xa3/0xa5
> [<ffffffff81861453>] ? param_sysfs_init+0x0/0x277
> [<ffffffff810001d7>] do_one_initcall+0x37/0x190
> [<ffffffff8184c6d0>] kernel_init+0x14f/0x1a5
> [<ffffffff81003bd4>] kernel_thread_helper+0x4/0x10
> [<ffffffff8131417c>] ? restore_args+0x0/0x30
> [<ffffffff8184c581>] ? kernel_init+0x0/0x1a5
> [<ffffffff81003bd0>] ? kernel_thread_helper+0x0/0x10
>
> This dump does not occur with standard 2.6.33-rc7. As the above turns off the
> locking correctness validator, I cannot really test to see what happens when
> suspending.
>

Ouch! I forgot to add the annotations to sysfs dirs...

Thanks much for the report, I will send an updated version soon!

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