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) _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
