thinkpad_acpi: BUG: unable to handle kernel NULL pointer dereference

[Jeremiah Mahler]

all,

Just tried linux-next 20160104 on a Lenovo Carbon X1 and I got a BUG
message about a NULL pointer dereference.  There is also a WARNING about
a mutex (see below).  It looks like it might be related to something in
the thinkpad_acpi module.

[...]
[    2.374627] thinkpad_acpi: ThinkPad ACPI Extras v0.25
[    2.374630] thinkpad_acpi: http://ibm-acpi.sf.net/
[    2.374632] thinkpad_acpi: ThinkPad BIOS G6ET59WW (2.03 ), EC unknown
[    2.374633] thinkpad_acpi: Lenovo ThinkPad X1 Carbon, model 3443CTO
[    2.375176] thinkpad_acpi: Unsupported brightness interface
[    2.375303] thinkpad_acpi: radio switch found; radios are enabled
[    2.375317] ------------[ cut here ]------------
[    2.375384] WARNING: CPU: 1 PID: 303 at kernel/locking/mutex.c:526 __mutex_lock_slowpath+0x2d8/0x2f0()
[    2.375453] DEBUG_LOCKS_WARN_ON(l->magic != l)
[    2.375503] Modules linked in:
[    2.375592]  battery thinkpad_acpi(+) mei_me snd_timer nvram ac snd mei video button tpm_tis(+) i2c_i801 shpchp soundcore lpc_ich tpm mfd_core i2c_core intel_smartconnect btusb btbcm btintel bluetooth rfkill loop ipv6 autofs4 ext4 crc16 mbcache jbd2 sd_mod ahci libahci libata scsi_mod sdhci_pci sdhci xhci_pci mmc_core xhci_hcd ehci_pci ehci_hcd usbcore usb_common thermal
[    2.377790] CPU: 1 PID: 303 Comm: systemd-udevd Not tainted 4.4.0-rc7-next-20160104+ #2
[    2.377888] Hardware name: LENOVO 3443CTO/3443CTO, BIOS G6ET59WW (2.03 ) 09/11/2012
[    2.377984]  ffffffff81722534 ffffffff812d0967 ffff880035e07ae0 ffffffff8106ad7d
[    2.378269]  ffffffffa0381360 ffff880035e07b30 ffffffffa0381368 ffff8801181ef100
[    2.378550]  ffffffffa03ea348 ffffffff8106adfc ffffffff8172251c 0000000000000020
[    2.378817] Call Trace:
[    2.378895]  [<ffffffff812d0967>] ? dump_stack+0x40/0x59
[    2.378971]  [<ffffffff8106ad7d>] ? warn_slowpath_common+0x7d/0xb0
[    2.379033]  [<ffffffff8106adfc>] ? warn_slowpath_fmt+0x4c/0x50
[    2.379109]  [<ffffffff81236053>] ? kernfs_add_one+0x103/0x160
[    2.379185]  [<ffffffff814f8858>] ? __mutex_lock_slowpath+0x2d8/0x2f0
[    2.379262]  [<ffffffff814f8886>] ? mutex_lock+0x16/0x30
[    2.379343]  [<ffffffffa037a363>] ? acpi_video_handles_brightness_key_presses+0x12/0x40 [video]
[    2.379427]  [<ffffffffa03e73c1>] ? hotkey_init+0x5aa/0x716 [thinkpad_acpi]
[    2.379502]  [<ffffffffa03e8402>] ? thinkpad_acpi_module_init.part.32+0x5f6/0x925 [thinkpad_acpi]
[    2.379598]  [<ffffffffa03e8731>] ? thinkpad_acpi_module_init.part.32+0x925/0x925 [thinkpad_acpi]
[    2.379693]  [<ffffffffa03e8a83>] ? thinkpad_acpi_module_init+0x352/0x8cf [thinkpad_acpi]
[    2.379799]  [<ffffffff8115092b>] ? free_pcppages_bulk+0xbb/0x480
[    2.379871]  [<ffffffff81002122>] ? do_one_initcall+0xb2/0x200
[    2.379947]  [<ffffffff8114846b>] ? do_init_module+0x5b/0x1e0
[    2.380012]  [<ffffffff810e366e>] ? load_module+0x220e/0x2810
[    2.380079]  [<ffffffff810dff70>] ? __symbol_put+0x30/0x30
[    2.380147]  [<ffffffff810e3e50>] ? SyS_finit_module+0x90/0xc0
[    2.380219]  [<ffffffff814fa832>] ? entry_SYSCALL_64_fastpath+0x16/0x71
[    2.380296] ---[ end trace 60661306144c0866 ]---
[    2.380374] BUG: unable to handle kernel NULL pointer dereference at           (null)
[    2.380552] IP: [<ffffffff814f8655>] __mutex_lock_slowpath+0xd5/0x2f0
[    2.380682] PGD 0 
[    2.380795] Oops: 0002 [#1] SMP 
[    2.380968] Modules linked in: battery thinkpad_acpi(+) mei_me snd_timer nvram ac snd mei video button tpm_tis(+) i2c_i801 shpchp soundcore lpc_ich tpm mfd_core i2c_core intel_smartconnect btusb btbcm btintel bluetooth rfkill loop ipv6 autofs4 ext4 crc16 mbcache jbd2 sd_mod ahci libahci libata scsi_mod sdhci_pci sdhci xhci_pci mmc_core xhci_hcd ehci_pci ehci_hcd usbcore usb_common thermal
[    2.383278] CPU: 1 PID: 303 Comm: systemd-udevd Tainted: G        W       4.4.0-rc7-next-20160104+ #2
[    2.383358] Hardware name: LENOVO 3443CTO/3443CTO, BIOS G6ET59WW (2.03 ) 09/11/2012
[    2.383455] task: ffff8801181ef100 ti: ffff880035e04000 task.ti: ffff880035e04000
[    2.383547] RIP: 0010:[<ffffffff814f8655>]  [<ffffffff814f8655>] __mutex_lock_slowpath+0xd5/0x2f0
[    2.383634] ACPI: Battery Slot [BAT0] (battery present)
[    2.383706] RSP: 0018:ffff880035e07b40  EFLAGS: 00010002
[    2.383761] RAX: 0000000000000000 RBX: ffffffffa0381360 RCX: ffffffffa0381380
[    2.383820] RDX: 0000000000000000 RSI: ffff880035e07b50 RDI: ffffffffa0381360
[    2.383874] RBP: ffff880035e07ba0 R08: 0000000000000000 R09: 00000000000002c4
[    2.383924] R10: ffffffff81a85600 R11: 00000000000002c4 R12: ffffffffa0381368
[    2.383975] R13: ffff8801181ef100 R14: 00000000ffffffff R15: 0000000000000246
[    2.384026] FS:  00007f1c1743a8c0(0000) GS:ffff88011e280000(0000) knlGS:0000000000000000
[    2.384087] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.384136] CR2: 0000000000000000 CR3: 0000000035fa6000 CR4: 00000000001406e0
[    2.384186] Stack:
[    2.384230]  ffff8800c76612f8 ffffffffa0381380 ffffffffa0381380 0000000000000000
[    2.384419]  1111111111111111 ffff880035e07b50 ffff8800c9ea1800 ffffffffa0381360
[    2.384607]  0000000000000001 0000000000000001 ffffffffa03ea348 ffffffffa03e1c60
[    2.384799] Call Trace:
[    2.384846]  [<ffffffff814f8886>] ? mutex_lock+0x16/0x30
[    2.384896]  [<ffffffffa037a363>] ? acpi_video_handles_brightness_key_presses+0x12/0x40 [video]
[    2.384961]  [<ffffffffa03e73c1>] ? hotkey_init+0x5aa/0x716 [thinkpad_acpi]
[    2.385014]  [<ffffffffa03e8402>] ? thinkpad_acpi_module_init.part.32+0x5f6/0x925 [thinkpad_acpi]
[    2.385085]  [<ffffffffa03e8731>] ? thinkpad_acpi_module_init.part.32+0x925/0x925 [thinkpad_acpi]
[    2.385152]  [<ffffffffa03e8a83>] ? thinkpad_acpi_module_init+0x352/0x8cf [thinkpad_acpi]
[    2.385216]  [<ffffffff8115092b>] ? free_pcppages_bulk+0xbb/0x480
[    2.385271]  [<ffffffff81002122>] ? do_one_initcall+0xb2/0x200
[    2.385323]  [<ffffffff8114846b>] ? do_init_module+0x5b/0x1e0
[    2.385373]  [<ffffffff810e366e>] ? load_module+0x220e/0x2810
[    2.385427]  [<ffffffff810dff70>] ? __symbol_put+0x30/0x30
[    2.385484]  [<ffffffff810e3e50>] ? SyS_finit_module+0x90/0xc0
[    2.385535]  [<ffffffff814fa832>] ? entry_SYSCALL_64_fastpath+0x16/0x71
[    2.385588] Code: 48 89 df e8 0e 24 bb ff 48 8d 43 20 48 8d 74 24 10 48 89 c1 48 89 44 24 08 48 8b 43 28 48 89 4c 24 10 48 89 73 28 48 89 44 24 18 <48> 89 30 4c 89 6c 24 20 8b 03 85 c0 78 0e 44 89 f0 87 03 83 f8 
[    2.387856] RIP  [<ffffffff814f8655>] __mutex_lock_slowpath+0xd5/0x2f0
[    2.387945]  RSP <ffff880035e07b40>
[    2.387993] CR2: 0000000000000000
[    2.388042] ---[ end trace 60661306144c0867 ]---
[    2.392773] [drm] Initialized drm 1.1.0 20060810
[    2.415803] tpm_tis 00:05: TPM is disabled/deactivated (0x6)
[    2.431086] wmi: Mapper loaded
[...]

-- 
- Jeremiah Mahler
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