Re: OOPS/panic in iio_dummy (v3.6-rc6-176-gabef3bd)

[Lars-Peter Clausen]

On 09/22/2012 04:13 AM, Peter Hüwe wrote:
> Hi,
> 
> loading iio_dummy results in kernel panic as the call to 
> iio_buffer_register in iio_dummy_probe is performed with indio_dev->buffer == 
> NULL and thus the access to indio_dev->buffer->attrs results in this 
> oops/panic.
> 
> Thanks,
> Peter
> 

Hi,

I sent a patch or this a couple of days ago. See
http://comments.gmane.org/gmane.linux.kernel.iio/5550

- Lars


> Steps to reproduce:
> 
> #modprobe iio_dummy
> iio_dummy: module is from the staging directory, the quality is unknown, you 
> have been warned.
> 
> Modules linked in: iio_dummy(C+) industrialio
> Pid: 615, comm: modprobe Tainted: G         C   3.6.0-rc6-00180-g68d0383-dirty
> RIP: 0033:[<00000000a089d846>]
> RSP: 000000009f4ffd30  EFLAGS: 00010206
> RAX: 0000000000000004 RBX: 00000000a08be6a0 RCX: 0000000000000000
> RDX: 000000006036a320 RSI: 0000000000000008 RDI: 0000000000000000
> RBP: 000000009f4ffda0 R08: 000000009f4ff900 R09: 0000000060406da8
> R10: 000000000000004a R11: 0000000000000246 R12: 00000000602a58bc
> R13: 0000000000000005 R14: 000000006005f170 R15: 000000009f6b0400
> Call Trace: 
> 603675d8:  [<6001d53d>] segv+0x1bd/0x340
> 603675f8:  [<6008b8ab>] handle_irq_event_percpu+0xab/0x1b0
> 60367620:  [<6008b9b0>] handle_irq_event+0x0/0x40
> 60367630:  [<6002e09c>] os_waiting_for_events+0x0/0xc5
> 60367658:  [<6008fccf>] rcu_irq_exit+0x5f/0xb0
> 603676a8:  [<6001d713>] segv_handler+0x53/0xb0
> 603676c8:  [<60019b5c>] sigio_handler+0xac/0xc0
> 603676f8:  [<6002ff5a>] sig_handler_common+0xa4/0xb9
> 60367708:  [<6005f170>] __mutex_init+0x0/0x20
> 60367718:  [<602a58bc>] printk+0x0/0xa8
> 60367780:  [<a089d846>] iio_buffer_register+0x46/0x610 [industrialio]
> 60367818:  [<60016c34>] _einittext+0x2572/0x38f6
> 60367828:  [<60016728>] _einittext+0x2066/0x38f6
> 60367908:  [<60016c34>] _einittext+0x2572/0x38f6
> 603679a8:  [<60019b70>] to_irq_stack+0x0/0xe0
> 60367a28:  [<60019b70>] to_irq_stack+0x0/0xe0
> 60367a38:  [<600300b5>] sig_handler+0x4a/0x5d
> 60367a58:  [<6002fb81>] hard_handler+0x89/0xd8
> 60367a90:  [<602a58bc>] printk+0x0/0xa8
> 60367aa0:  [<6005f170>] __mutex_init+0x0/0x20
> 60367b08:  [<602a58bc>] printk+0x0/0xa8
> 60367b18:  [<6005f170>] __mutex_init+0x0/0x20
> 60367b68:  [<a089d846>] iio_buffer_register+0x46/0x610 [industrialio]
> 
> Kernel panic - not syncing: Kernel mode fault at addr 0x68, ip 0xa089d846
> Call Trace: 
> 603674b0:  [<a089d846>] iio_buffer_register+0x46/0x610 [industrialio]
> 603674c8:  [<602a5751>] panic+0x146/0x2b1
> 60367500:  [<a089d846>] iio_buffer_register+0x46/0x610 [industrialio]
> 60367508:  [<602a560b>] panic+0x0/0x2b1
> 60367520:  [<6007a4d4>] __module_text_address+0x14/0x70
> 60367538:  [<6007ec20>] is_module_text_address+0x10/0x20
> 60367548:  [<600582c7>] __kernel_text_address+0x87/0xc0
> 60367568:  [<6001bc1f>] show_trace+0x7f/0xf0
> 60367598:  [<a089d846>] iio_buffer_register+0x46/0x610 [industrialio]
> 603675c0:  [<a089d846>] iio_buffer_register+0x46/0x610 [industrialio]
> 603675d8:  [<6001d55b>] segv+0x1db/0x340
> 603675f8:  [<6008b8ab>] handle_irq_event_percpu+0xab/0x1b0
> 60367620:  [<6008b9b0>] handle_irq_event+0x0/0x40
> 60367630:  [<6002e09c>] os_waiting_for_events+0x0/0xc5
> 60367658:  [<6008fccf>] rcu_irq_exit+0x5f/0xb0
> 603676a8:  [<6001d713>] segv_handler+0x53/0xb0
> 603676c8:  [<60019b5c>] sigio_handler+0xac/0xc0
> 603676f8:  [<6002ff5a>] sig_handler_common+0xa4/0xb9
> 60367708:  [<6005f170>] __mutex_init+0x0/0x20
> 60367718:  [<602a58bc>] printk+0x0/0xa8
> 60367780:  [<a089d846>] iio_buffer_register+0x46/0x610 [industrialio]
> 60367818:  [<60016c34>] _einittext+0x2572/0x38f6
> 60367828:  [<60016728>] _einittext+0x2066/0x38f6
> 60367908:  [<60016c34>] _einittext+0x2572/0x38f6
> 603679a8:  [<60019b70>] to_irq_stack+0x0/0xe0
> 60367a28:  [<60019b70>] to_irq_stack+0x0/0xe0
> 60367a38:  [<600300b5>] sig_handler+0x4a/0x5d
> 60367a58:  [<6002fb81>] hard_handler+0x89/0xd8
> 60367a90:  [<602a58bc>] printk+0x0/0xa8
> 60367aa0:  [<6005f170>] __mutex_init+0x0/0x20
> 60367b08:  [<602a58bc>] printk+0x0/0xa8
> 60367b18:  [<6005f170>] __mutex_init+0x0/0x20
> 60367b68:  [<a089d846>] iio_buffer_register+0x46/0x610 [industrialio]
> 
> 
> Modules linked in: iio_dummy(C+) industrialio
> Pid: 615, comm: modprobe Tainted: G         C   3.6.0-rc6-00180-g68d0383-dirty
> RIP: 0033:[<00000000402eff9a>]
> RSP: 0000007fbfbf6798  EFLAGS: 00000246
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: ffffffffffffffff
> RDX: 000000000060e110 RSI: 00000000000148c9 RDI: 0000000040024000
> RBP: 0000000000611b70 R08: 000000000060e100 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 000000000060e110
> R13: 0000000000000000 R14: 000000000060e010 R15: 0000000000611b88
> Call Trace: 
> 60367448:  [<6001db1e>] panic_exit+0x3e/0x60
> 60367478:  [<600616ad>] notifier_call_chain+0x4d/0x70
> 603674a0:  [<a089d846>] iio_buffer_register+0x46/0x610 [industrialio]
> 603674b8:  [<60061708>] atomic_notifier_call_chain+0x18/0x20
> 603674c8:  [<602a5784>] panic+0x179/0x2b1
> 60367500:  [<a089d846>] iio_buffer_register+0x46/0x610 [industrialio]
> 60367508:  [<602a560b>] panic+0x0/0x2b1
> 60367520:  [<6007a4d4>] __module_text_address+0x14/0x70
> 60367538:  [<6007ec20>] is_module_text_address+0x10/0x20
> 60367548:  [<600582c7>] __kernel_text_address+0x87/0xc0
> 60367568:  [<6001bc1f>] show_trace+0x7f/0xf0
> 60367598:  [<a089d846>] iio_buffer_register+0x46/0x610 [industrialio]
> 603675c0:  [<a089d846>] iio_buffer_register+0x46/0x610 [industrialio]
> 603675d8:  [<6001d55b>] segv+0x1db/0x340
> 603675f8:  [<6008b8ab>] handle_irq_event_percpu+0xab/0x1b0
> 60367620:  [<6008b9b0>] handle_irq_event+0x0/0x40
> 60367630:  [<6002e09c>] os_waiting_for_events+0x0/0xc5
> 60367658:  [<6008fccf>] rcu_irq_exit+0x5f/0xb0
> 603676a8:  [<6001d713>] segv_handler+0x53/0xb0
> 603676c8:  [<60019b5c>] sigio_handler+0xac/0xc0
> 603676f8:  [<6002ff5a>] sig_handler_common+0xa4/0xb9
> 60367708:  [<6005f170>] __mutex_init+0x0/0x20
> 60367718:  [<602a58bc>] printk+0x0/0xa8
> 60367780:  [<a089d846>] iio_buffer_register+0x46/0x610 [industrialio]
> 60367818:  [<60016c34>] _einittext+0x2572/0x38f6
> 60367828:  [<60016728>] _einittext+0x2066/0x38f6
> 60367908:  [<60016c34>] _einittext+0x2572/0x38f6
> 603679a8:  [<60019b70>] to_irq_stack+0x0/0xe0
> 60367a28:  [<60019b70>] to_irq_stack+0x0/0xe0
> 60367a38:  [<600300b5>] sig_handler+0x4a/0x5d
> 60367a58:  [<6002fb81>] hard_handler+0x89/0xd8
> 60367a90:  [<602a58bc>] printk+0x0/0xa8
> 60367aa0:  [<6005f170>] __mutex_init+0x0/0x20
> 60367b08:  [<602a58bc>] printk+0x0/0xa8
> 60367b18:  [<6005f170>] __mutex_init+0x0/0x20
> 60367b68:  [<a089d846>] iio_buffer_register+0x46/0x610 [industrialio]
> 
> 
> Tested on recent linus' tree (v3.6-rc6-176-gabef3bd)
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