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

DISCUSSION Peter Hüwe 3 participants 3 messages Sep 22, 2012 IIO

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Peter Hüwe

author

2012-09-22 02:08 UTC #0 lore raw

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

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)

Lars-Peter Clausen

2012-09-22 08:10 UTC #1 lore raw

Quoted 10 lines · Peter Hüwe

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

Quoted 131 lines

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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Jonathan Cameron

maintainer

2012-09-22 09:57 UTC #2 lore raw

Quoted 12 lines · Lars-Peter Clausen

Quoted 10 lines · Peter Hüwe
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

Quoted 6 lines

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

Sorry, I'd completely forgotten that was queued up in my fixes branch. As it's only in the dummy driver I've changed my mind and pulled it into the togreg branch which will merge for 3.7. It's late in the cycle and we are afterall talking about a fix for 'fake' hardware.

Quoted 139 lines

Quoted 127 lines

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]

Quoted 6 lines

Tested on recent linus' tree (v3.6-rc6-176-gabef3bd)
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