linux-kernel - Regression in inv

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Date:	Tue, 26 Apr 2016 23:26:51 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	linux-kernel@...r.kernel.org, mranostay@...il.com,
	jic23@...nel.org, daniel.baluta@...el.com,
	linux-iio@...r.kernel.org
Subject: Regression in inv_mpu6050: 4.6.0-rc5


This now causes us to crash and burn on the ASUS T100TA Baytrail/T
platforms

[    9.308605] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
[    9.310735] IP: [<ffffffffc046622e>] inv_mpu_probe+0x5e/0x110 [inv_mpu6050_i2c]
[    9.312876] PGD 0 
[    9.314956] Oops: 0000 [#1] SMP 
[    9.317018] Modules linked in: inv_mpu6050_i2c(+) aes_x86_64 lrw gf128mul inv_mpu6050 glue_helper ablk_helper cryptd industrialio_triggered_buffer kfifo_buf industrialio snd_intel_sst_acpi snd_intel_sst_core i2c_mux snd_soc_rt5640 snd_soc_sst_mfld_platform snd_soc_rl6231 snd_soc_sst_match input_leds snd_soc_core hci_uart snd_compress snd_pcm_dmaengine lpc_ich snd_pcm btbcm snd_seq_midi btintel snd_seq_midi_event bluetooth snd_rawmidi wmi snd_seq snd_seq_device dw_dmac snd_timer dw_dmac_core soc_button_array snd soundcore processor_thermal_device int3402_thermal ac97_bus int3403_thermal int3400_thermal i2c_designware_platform intel_soc_dts_iosf int340x_thermal_zone acpi_thermal_rel acpi_pad i2c_designware_core pwm_lpss_platform pwm_lpss ipv6 autofs4 i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect
[    9.326919]  sysimgblt fb_sys_fops drm mmc_block hid_generic usbhid i2c_hid video hid sdhci_acpi sdhci
[    9.332174] CPU: 3 PID: 326 Comm: systemd-udevd Not tainted 4.6.0-rc5+ #3
[    9.334899] Hardware name: ASUSTeK COMPUTER INC. T100TA/T100TA, BIOS T100TA.307 05/09/2014
[    9.337655] task: ffff8800706dde80 ti: ffff880035928000 task.ti: ffff880035928000
[    9.340428] RIP: 0010:[<ffffffffc046622e>]  [<ffffffffc046622e>] inv_mpu_probe+0x5e/0x110 [inv_mpu6050_i2c]
[    9.343286] RSP: 0018:ffff88003592bad8  EFLAGS: 00010287
[    9.346132] RAX: ffff88003523e000 RBX: ffff880070d57000 RCX: ffff880070e51a40
[    9.349006] RDX: ffff880070e51a20 RSI: 00000000000000cf RDI: ffff88003523e000
[    9.351863] RBP: ffff88003592bb08 R08: ffff88007558c9f8 R09: ffff880070e51a40
[    9.354713] R10: ffff880070e51a38 R11: 0000000000000000 R12: 0000000000000000
[    9.357569] R13: ffff880070d57000 R14: ffffffffc04661d0 R15: ffff880070d57004
[    9.360431] FS:  00007f56017618c0(0000) GS:ffff880078980000(0000) knlGS:0000000000000000
[    9.363330] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.366226] CR2: 0000000000000018 CR3: 00000000359f6000 CR4: 00000000001006e0
[    9.369140] Stack:
[    9.371988]  ffffffff81303a32 00000000000000cf ffff880070d57020 ffffffffc04670c0
[    9.374883]  ffff880070d57020 ffff880070d57000 ffff88003592bb40 ffffffff8141ea6b
[    9.377769]  ffff880070d57020 0000000000000000 ffffffffc0468038 0000000000000029
[    9.380650] Call Trace:
[    9.383493]  [<ffffffff81303a32>] ? acpi_dev_pm_attach+0x85/0xa2
[    9.386382]  [<ffffffff8141ea6b>] i2c_device_probe+0xfb/0x1b0
[    9.389260]  [<ffffffff8138be67>] driver_probe_device+0x227/0x440
[    9.392130]  [<ffffffff8138c14c>] __driver_attach+0xcc/0xf0
[    9.395000]  [<ffffffff8138c080>] ? driver_probe_device+0x440/0x440
[    9.397875]  [<ffffffff81389a07>] bus_for_each_dev+0x67/0xb0
[    9.400759]  [<ffffffff8138b599>] driver_attach+0x19/0x20
[    9.403636]  [<ffffffff8138b031>] bus_add_driver+0x1e1/0x280
[    9.406539]  [<ffffffffc0076000>] ? 0xffffffffc0076000
[    9.409424]  [<ffffffff8138c8bb>] driver_register+0x5b/0xd0
[    9.412278]  [<ffffffff8141f666>] i2c_register_driver+0x26/0x90
[    9.415171]  [<ffffffffc0076017>] inv_mpu_driver_init+0x17/0x19 [inv_mpu6050_i2c]
[    9.418058]  [<ffffffff810003de>] do_one_initcall+0xae/0x1f0
[    9.420972]  [<ffffffff8113f07b>] ? kmem_cache_alloc+0x2b/0xc0
[    9.423856]  [<ffffffff810fbfa3>] do_init_module+0x55/0x1c5
[    9.426770]  [<ffffffff810c0733>] load_module+0x2123/0x2730
[    9.429664]  [<ffffffff810bd8f0>] ? __symbol_put+0x50/0x50
[    9.432537]  [<ffffffff810c0fb6>] SYSC_finit_module+0xe6/0x120
[    9.435382]  [<ffffffff810c1009>] SyS_finit_module+0x9/0x10
[    9.438212]  [<ffffffff8152819f>] entry_SYSCALL_64_fastpath+0x17/0x93
[    9.441015] Code: 00 00 00 31 c9 31 d2 48 89 df 48 c7 c6 e0 70 46 c0 e8 37 e7 f3 c0 48 3d 00 f0 ff ff 48 89 c7 0f 87 94 00 00 00 8b b3 d0 02 00 00 <45> 8b 44 24 18 31 c9 4c 89 e2 e8 b3 b9 06 00 85 c0 78 4f 48 8b 
[    9.446976] RIP  [<ffffffffc046622e>] inv_mpu_probe+0x5e/0x110 [inv_mpu6050_i2c]
[    9.449967]  RSP <ffff88003592bad8>
[    9.452844] CR2: 0000000000000018
[    9.455673] ---[ end trace d9e48d40f1079c34 ]---

Alan