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

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Date:	Sat, 22 Sep 2012 04:13:36 +0200
From:	Peter Hüwe <PeterHuewe@....de>
To:	Jonathan Cameron <jic23@....ac.uk>
Cc:	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: OOPS/panic in iio_dummy (v3.6-rc6-176-gabef3bd)

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)
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