linux-kernel - BUG: Asus laptop, null pointer dereference

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Date:	Mon, 25 Jan 2016 16:10:55 +0100
From:	Heinz Diehl <htd+ml@...tha.org>
To:	linux-kernel@...r.kernel.org
Subject: BUG: Asus laptop, null pointer dereference

Hi,

I'm hitting the following bug when starting my Asus U45JC laptop. This
happens with both 4.4.0 and 4.5-rc1. 4.3.x (and any older kernel) is
fine.

[    4.056862] asus_laptop:    model detected
[    4.058731] BUG: unable to handle kernel NULL pointer dereference at 0000000000000e20
[    4.060018] IP: [<ffffffffc03d3423>] asus_sysfs_is_visible+0x13/0x1d0 [asus_laptop]
[    4.061346] PGD 0 
[    4.062629] Oops: 0000 [#1] PREEMPT SMP 
[    4.063960] Modules linked in: wmi asus_laptop(+) input_polldev sparse_keymap rfkill nfsd auth_rpcgss oid_registry nfs_acl lockd grace sunrpc sch_fq_codel tcp_westwood xfs libcrc32c hid_logitech_dj crc32c_intel serio_raw atl1c i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm i2c_core video
[    4.067026] CPU: 1 PID: 536 Comm: systemd-udevd Not tainted 4.4.0 #1
[    4.068515] Hardware name: ASUSTeK Computer Inc.         U45JC/U45JC, BIOS U45JC.208 02/24/2011
[    4.070023] task: ffff88003645b680 ti: ffff8800a4a0c000 task.ti: ffff8800a4a0c000
[    4.071568] RIP: 0010:[<ffffffffc03d3423>]  [<ffffffffc03d3423>] asus_sysfs_is_visible+0x13/0x1d0 [asus_laptop]
[    4.073188] RSP: 0000:ffff8800a4a0faf8  EFLAGS: 00010282
[    4.074820] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[    4.076462] RDX: 0000000000000000 RSI: ffffffffc03d63c0 RDI: ffff88003675b420
[    4.078109] RBP: ffff8800a4a0fb08 R08: ffff8801428940c8 R09: 0000000000000124
[    4.079777] R10: ffff88014348d100 R11: 0000000000000014 R12: ffffffffc03d4940
[    4.081470] R13: 0000000000000000 R14: ffff8801418af000 R15: ffffffffc03d6220
[    4.083156] FS:  00007f58ba6dd8c0(0000) GS:ffff880147c40000(0000) knlGS:0000000000000000
[    4.084885] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.086611] CR2: 0000000000000e20 CR3: 00000000a49f3000 CR4: 00000000000006e0
[    4.088351] Stack:
[    4.090066]  0000000000000000 ffffffffc03d4940 ffff8800a4a0fb50 ffffffff8122d12b
[    4.091838]  0000000000000000 ffff88003675b420 ffff880141327000 0000000000000000
[    4.093606]  0000000000000000 ffff880036b42498 0000000000000001 ffff8800a4a0fb60
[    4.095386] Call Trace:
[    4.097151]  [<ffffffff8122d12b>] internal_create_group+0xbb/0x310
[    4.098943]  [<ffffffff8122d393>] sysfs_create_group+0x13/0x20
[    4.100748]  [<ffffffffc03d292b>] asus_acpi_add+0x3bb/0xea0 [asus_laptop]
[    4.102583]  [<ffffffff81399d32>] acpi_device_probe+0x4f/0xf5
[    4.104415]  [<ffffffff81431107>] driver_probe_device+0x167/0x490
[    4.106254]  [<ffffffff814314b4>] __driver_attach+0x84/0x90
[    4.108087]  [<ffffffff81431430>] ? driver_probe_device+0x490/0x490
[    4.109931]  [<ffffffff8142ee34>] bus_for_each_dev+0x64/0xa0
[    4.111724]  [<ffffffff814309ae>] driver_attach+0x1e/0x20
[    4.113509]  [<ffffffff8143053b>] bus_add_driver+0x1eb/0x280
[    4.115273]  [<ffffffffc03da000>] ? 0xffffffffc03da000
[    4.117032]  [<ffffffff81431d10>] driver_register+0x60/0xe0
[    4.118818]  [<ffffffff81399c01>] acpi_bus_register_driver+0x38/0x40
[    4.120619]  [<ffffffffc03da02a>] asus_laptop_init+0x2a/0x1000 [asus_laptop]
[    4.122433]  [<ffffffff810003db>] do_one_initcall+0xab/0x1c0
[    4.124276]  [<ffffffff8114b43e>] do_init_module+0x5f/0x1e5
[    4.126114]  [<ffffffff810d8dff>] load_module+0x1f3f/0x2530
[    4.127943]  [<ffffffff810d5500>] ? __symbol_put+0x50/0x50
[    4.129786]  [<ffffffff810d581b>] ? copy_module_from_fd.isra.50+0xdb/0x130
[    4.131653]  [<ffffffff810d95ea>] SyS_finit_module+0x9a/0xc0
[    4.133521]  [<ffffffff816bacd7>] entry_SYSCALL_64_fastpath+0x12/0x6a
[    4.135378] Code: c7 80 48 3d c0 e8 11 7e d7 c0 4c 89 f7 e8 66 3c e5 ff e9 27 ff ff ff 90 66 66 66 66 90 55 48 89 e5 41 54 53 48 8b 87 90 00 00 00 <4c> 8b a0 20 0e 00 00 0f b6 80 95 0d 00 00 84 c0 74 1a 48 81 fe 
[    4.139719] RIP  [<ffffffffc03d3423>] asus_sysfs_is_visible+0x13/0x1d0 [asus_laptop]
[    4.141788]  RSP <ffff8800a4a0faf8>
[    4.143809] CR2: 0000000000000e20
[    4.145867] ---[ end trace 7d8d7d572a3e9126 ]---


Thanks, Heinz.