[Letux-kernel] Strange bug
H. Nikolaus Schaller
hns at goldelico.com
Thu May 17 13:56:27 CEST 2018
> Am 17.05.2018 um 11:19 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
>
>
>> Am 16.05.2018 um 21:55 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
>>
>> Hi,
>> I think since 4.17-rc1 (maybe before), I am sometimes
>> hitting a strange bug, a NULL dereference in strcmp().
>>
>> The call stack isn't very helpful since it happens
>> in some pinctrl setup:
>>
>> [ 13.274017] omap-iommu 480bd400.mmu: 480bd400.mmu: version 1.1
>> [ 13.306854] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP CCP2 was not initialized!
>> [ 13.360168] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP CSI2a was not initialized!
>> [ 13.423461] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP CCDC was not initialized!
>> [ 13.473449] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP preview was not initialized!
>> [ 13.494995] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP resizer was not initialized!
>> [ 13.525878] pinctrl_generic_add_group: backlight_pins_pinmux (1)
>> [ 13.532379] pwm-backlight backlight: backlight supply power not found, using dummy regulator
>> [ 13.557037] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP AEWB was not initialized!
>> [ 13.584777] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP AF was not initialized!
>> [ 13.593536] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP histogram was not initialized!
>> [ 13.603454] gab_probe: channel 2 error: -19
>> [ 13.609344] (NULL device *): hwmon: 'gta04-battery' is not a valid name attribute, please fix
>> [ 13.635070] read_channel: 17 1 (ptrval) (ptrval)
>> [ 13.643951] pinctrl_generic_add_group: backlight_pins_pinmux (1)
>> [ 13.650787] iio_charge:-749
>> [ 13.658721] pinctrl_get_group_selector: (null) backlight_pins_pinmux
>> [ 13.671844] Unable to handle kernel NULL pointer dereference at virtual address 00000000
>> [ 13.687347] pinctrl_generic_add_group: pinmux_mcbsp4_pins (3)
>> [ 13.693389] pgd = (ptrval)
>> [ 13.696380] [00000000] *pgd=00000000
>> [ 13.700134] Internal error: Oops: 17 [#1] PREEMPT SMP ARM
>> [ 13.705780] Modules linked in: snd_soc_gtm601 pwm_omap_dmtimer connector_analog_tv generic_adc_battery pwm_bl bq27xxx_battery_hdq bq27xxx_battery omap3_isp(+) videobuf2_dma_contig videobuf2_memops videobuf2_v4l2 videobuf2_common omap_hdq omap2430 snd_soc_omap_mcbsp(+) snd_soc_omap snd_pcm_dmaengine bmp280_i2c(+) bmp280 ov9655(+) v4l2_fwnode v4l2_common itg3200 at24 videodev phy_twl4030_usb tsc2007 hmc5843_i2c hmc5843_core bma180 musb_hdrc industrialio_triggered_buffer lis3lv02d_i2c media leds_tca6507 lis3lv02d kfifo_buf input_polldev gpio_twl4030 snd_soc_twl4030 twl4030_vibra twl4030_charger twl4030_pwrbutton twl4030_madc industrialio w2sg0004 gps_core w2cbw003_bluetooth ehci_omap omapdss omapdss_base cec
>> [ 13.771331] CPU: 0 PID: 937 Comm: kworker/0:2 Not tainted 4.17.0-rc2-letux+ #2290
>> [ 13.779174] Hardware name: Generic OMAP36xx (Flattened Device Tree)
>> [ 13.785736] Workqueue: events deferred_probe_work_func
>> [ 13.791107] PC is at strcmp+0x0/0x34
>> [ 13.794860] LR is at pinctrl_get_group_selector+0x6c/0xa8
>> [ 13.800506] pc : [<c0705afc>] lr : [<c0429840>] psr: 600f0013
>> [ 13.807067] sp : dddf9e08 ip : 00000000 fp : 00000011
>> [ 13.812530] r10: 0000000f r9 : 00000010 r8 : c0745b0c
>> [ 13.817993] r7 : 00000000 r6 : ddc41600 r5 : df9c5274 r4 : 0000000e
>> [ 13.824829] r3 : 600f0013 r2 : 00000002 r1 : df9c5274 r0 : 00000000
>> [ 13.831665] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
>> [ 13.839111] Control: 10c5387d Table: 9c88c019 DAC: 00000051
>> [ 13.845123] Process kworker/0:2 (pid: 937, stack limit = 0x(ptrval))
>> [ 13.851776] Stack: (0xdddf9e08 to 0xdddfa000)
>> [ 13.856323] 9e00: dddf9e2c ddc41600 df9c5274 00000000 dcc99f10 00000000
>> [ 13.864868] 9e20: dcc98b80 c042a808 dcc84110 00000001 00000002 dcc98e40 dcc5bd80 dcc85f40
>> [ 13.873413] 9e40: dcc99f10 00000000 00000000 dcc98b80 00000000 c0429040 00000014 dda424c0
>> [ 13.881988] 9e60: c0a58df0 c0876b8c dda47c10 00000000 dca09110 dda47c10 c0aca804 fffffdfb
>> [ 13.890563] 9e80: bf282014 0000002c c0a94390 c0429208 00000000 dda47c10 dca09150 c04bb85c
>> [ 13.899108] 9ea0: dda47c10 00000000 c0aca808 c049fb58 00000000 dddf9ee8 c049fe64 dda47c44
>> [ 13.907714] 9ec0: df9bbe00 c0a02d00 00000000 c049e3b8 dd81be6c dcc3d738 dda47c10 c0a63258
>> [ 13.916259] 9ee0: 00000001 c049f9d8 dda47c10 00000001 00000000 dda47c10 c0a63258 dda47c10
>> [ 13.924804] 9f00: c0a9dba0 c049ef94 dda47c10 c0a63044 c0a63060 c049f4a4 c049f3b8 dde97900
>> [ 13.933380] 9f20: c0a63078 df9b8c00 00000000 df9bbe00 c0a02d00 c0145dac dde97900 c0a63078
>> [ 13.941955] 9f40: ffff9023 dde97900 df9b8c00 df9b8c00 dddf8000 df9b8c18 c0a02d00 dde97918
>> [ 13.950500] 9f60: 00000008 c0146580 dda48240 dde09ec0 dde16640 00000000 dde97900 c01462c0
>> [ 13.959075] 9f80: dd8b1ef0 dde09edc 00000000 c014a598 dde16640 c014a464 00000000 00000000
>> [ 13.967620] 9fa0: 00000000 00000000 00000000 c01010e8 00000000 00000000 00000000 00000000
>> [ 13.976196] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
>> [ 13.984741] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
>> [ 13.993316] [<c0705afc>] (strcmp) from [<c0429840>] (pinctrl_get_group_selector+0x6c/0xa8)
>> [ 14.001953] [<c0429840>] (pinctrl_get_group_selector) from [<c042a808>] (pinmux_map_to_setting+0x158/0x1a0)
>> [ 14.012145] [<c042a808>] (pinmux_map_to_setting) from [<c0429040>] (create_pinctrl+0x1f0/0x2f8)
>> [ 14.021240] [<c0429040>] (create_pinctrl) from [<c0429208>] (devm_pinctrl_get+0x2c/0x6c)
>> [ 14.029724] [<c0429208>] (devm_pinctrl_get) from [<c04bb85c>] (pinctrl_bind_pins+0x3c/0x138)
>> [ 14.038574] [<c04bb85c>] (pinctrl_bind_pins) from [<c049fb58>] (driver_probe_device+0xe8/0x318)
>> [ 14.047668] [<c049fb58>] (driver_probe_device) from [<c049e3b8>] (bus_for_each_drv+0x84/0x94)
>> [ 14.056610] [<c049e3b8>] (bus_for_each_drv) from [<c049f9d8>] (__device_attach+0x88/0xfc)
>> [ 14.065155] [<c049f9d8>] (__device_attach) from [<c049ef94>] (bus_probe_device+0x28/0x80)
>> [ 14.073730] [<c049ef94>] (bus_probe_device) from [<c049f4a4>] (deferred_probe_work_func+0xec/0x120)
>> [ 14.083221] [<c049f4a4>] (deferred_probe_work_func) from [<c0145dac>] (process_one_work+0x244/0x464)
>> [ 14.092803] [<c0145dac>] (process_one_work) from [<c0146580>] (worker_thread+0x2c0/0x3ec)
>> [ 14.101348] [<c0146580>] (worker_thread) from [<c014a598>] (kthread+0x134/0x150)
>> [ 14.109100] [<c014a598>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
>> [ 14.116638] Exception stack(0xdddf9fb0 to 0xdddf9ff8)
>> [ 14.121917] 9fa0: 00000000 00000000 00000000 00000000
>> [ 14.130462] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
>> [ 14.139038] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
>> [ 14.145935] Code: e3520000 e5e32001 1afffffb e12fff1e (e4d03001)
>> [ 14.282989] twl4030_voice_set_tristate codec=(ptrval) 1
>> [ 14.294921] TPS Voice IF is tristated
>> [ 14.299560] omap-mcbsp 49022000.mcbsp: ASoC: Failed to create component debugfs directory
>>
>> After that, the GTA04 kernel doesn't recover and finish booting.
>>
>> The problem does not appear always, so that after rebooting once or twice everything
>> seems to be fine.
>>
>> What I found as a "cure" is to add:
>>
>> root at letux:~# more /etc/modprobe.d/blacklist.conf
>> blacklist pwm_bl
>> blacklist omap3_isp
>> root at letux:~#
>
> commenting out omap3_isp makes no difference.
>
> But not blocking pwm_bl (even without loading omap3_isp)makes it hang again:
>
> [ 6.365997] bq27xxx_battery_settings
> [ 6.384368] bq27xxx_battery_settings: power_supply_get_battery_info failed ret=-1088446444
> [ 6.466979] pwm-backlight backlight: backlight supply power not found, using dummy regulator
> [ 6.559082] wwan_on_off_init: wwan_on_off_init
> [ 6.569183] (NULL device *): hwmon: 'gta04-battery' is not a valid name attribute, please fix
> [ 6.615905] pps_core: LinuxPPS API ver. 1 registered
> [ 6.637145] iio_charge:-749
> [ 6.642486] Unable to handle kernel NULL pointer dereference at virtual address 00000000
> [ 6.666229] pgd = (ptrval)
> [ 6.669219] [00000000] *pgd=00000000
> [ 6.672973] Internal error: Oops: 17 [#1] PREEMPT SMP ARM
> [ 6.678619] Modules linked in: snd_soc_simple_card_utils snd_soc_omap_twl4030(+) pps_core(+) encoder_opa362 wwan_on_off(+) snd_soc_gtm601 connector_analog_tv pwm_omap_dmtimer generic_adc_battery pwm_bl bq27xxx_battery_hdq bq27xxx_battery bmp280_spi wlcore_sdio ov9655 v4l2_fwnode v4l2_common omap_hdq omap2430 bmp280_i2c videodev bmp280 at24 bmc150_accel_i2c tsc2007 leds_tca6507 bmc150_magn_i2c bmc150_accel_core bmc150_magn media industrialio_triggered_buffer kfifo_buf phy_twl4030_usb snd_soc_omap_mcbsp snd_soc_omap snd_pcm_dmaengine gpio_twl4030 musb_hdrc snd_soc_twl4030 gnss_w2sg0004 twl4030_vibra twl4030_madc twl4030_charger twl4030_pwrbutton industrialio gnss w2cbw003_bluetooth ehci_omap omapdss omapdss_base cec
> [ 6.744812] CPU: 0 PID: 43 Comm: kworker/0:1 Not tainted 4.17.0-rc5-letux+ #2330
> [ 6.752532] Hardware name: Generic OMAP36xx (Flattened Device Tree)
> [ 6.759094] Workqueue: events deferred_probe_work_func
> [ 6.764465] PC is at strcmp+0x0/0x34
> [ 6.768218] LR is at pinctrl_get_group_selector+0x44/0x78
> [ 6.773864] pc : [<c070d12c>] lr : [<c0429aac>] psr: a0000113
> [ 6.780395] sp : ee23de10 ip : ed1dce90 fp : 0000001e
> [ 6.785827] r10: 0000001b r9 : ed0c8840 r8 : 0000001e
> [ 6.791290] r7 : c074cca8 r6 : ef7c4a20 r5 : ee42a600 r4 : 0000001b
> [ 6.798095] r3 : c0427cf0 r2 : 00000000 r1 : ef7c4a20 r0 : 00000000
> [ 6.804901] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
> [ 6.812347] Control: 10c5387d Table: ae7a4019 DAC: 00000051
> [ 6.818328] Process kworker/0:1 (pid: 43, stack limit = 0x(ptrval))
> [ 6.824890] Stack: (0xee23de10 to 0xee23e000)
> [ 6.829437] de00: ee42a600 ef7c4a20 00000000 ed1d8810
> [ 6.837982] de20: 00000000 c042aa6c ed206fd0 00000001 00000002 ed0c8cc0 ed0c8880 ed0c88c0
> [ 6.846527] de40: ed1d8810 00000000 00000000 ed0c8840 00000000 c04292d4 00000014 ee25fa40
> [ 6.855072] de60: c0a58e30 c087f8cc ee25d010 00000000 ed0c8d10 ee25d010 c0aca944 fffffdfb
> [ 6.863616] de80: bf202014 0000002c c0a94490 c042949c 00000000 ee25d010 ed0c8990 c04bbb58
> [ 6.872161] dea0: ee25d010 00000000 c0aca948 c049fe50 00000000 ee23dee8 c04a015c ee25d044
> [ 6.880706] dec0: ef7baf00 c0a02d00 00000000 c049e6b0 ee01be6c ed1fad38 ee25d010 c0a632d0
> [ 6.889251] dee0: 00000001 c049fcd0 ee25d010 00000001 00000000 ee25d010 c0a632d0 ee25d010
> [ 6.897766] df00: c0a9dce0 c049f28c ee25d010 c0a630bc c0a630d8 c049f79c c049f6b0 ee1dbe80
> [ 6.906311] df20: c0a630f0 ef7b7c40 00000000 ef7baf00 c0a02d00 c0145ef0 ee1dbe80 c0a630f0
> [ 6.914855] df40: ffff8d67 ee1dbe80 ef7b7c40 ef7b7c40 ee23c000 ef7b7c58 c0a02d00 ee1dbe98
> [ 6.923400] df60: 00000008 c01466c4 00000000 ee2097c0 ee209800 00000000 ee1dbe80 c0146404
> [ 6.931915] df80: ee0b5ef0 ee2097dc 00000000 c014a6dc ee209800 c014a5a8 00000000 00000000
> [ 6.940460] dfa0: 00000000 00000000 00000000 c01010e8 00000000 00000000 00000000 00000000
> [ 6.949005] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> [ 6.957519] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
> [ 6.966064] [<c070d12c>] (strcmp) from [<c0429aac>] (pinctrl_get_group_selector+0x44/0x78)
> [ 6.974700] [<c0429aac>] (pinctrl_get_group_selector) from [<c042aa6c>] (pinmux_map_to_setting+0x158/0x1a0)
> [ 6.984893] [<c042aa6c>] (pinmux_map_to_setting) from [<c04292d4>] (create_pinctrl+0x1f0/0x2f8)
> [ 6.993957] [<c04292d4>] (create_pinctrl) from [<c042949c>] (devm_pinctrl_get+0x2c/0x6c)
> [ 7.002410] [<c042949c>] (devm_pinctrl_get) from [<c04bbb58>] (pinctrl_bind_pins+0x3c/0x138)
> [ 7.011230] [<c04bbb58>] (pinctrl_bind_pins) from [<c049fe50>] (driver_probe_device+0xe8/0x318)
> [ 7.020294] [<c049fe50>] (driver_probe_device) from [<c049e6b0>] (bus_for_each_drv+0x84/0x94)
> [ 7.029205] [<c049e6b0>] (bus_for_each_drv) from [<c049fcd0>] (__device_attach+0x88/0xfc)
> [ 7.037750] [<c049fcd0>] (__device_attach) from [<c049f28c>] (bus_probe_device+0x28/0x80)
> [ 7.046295] [<c049f28c>] (bus_probe_device) from [<c049f79c>] (deferred_probe_work_func+0xec/0x120)
> [ 7.055755] [<c049f79c>] (deferred_probe_work_func) from [<c0145ef0>] (process_one_work+0x244/0x464)
> [ 7.065277] [<c0145ef0>] (process_one_work) from [<c01466c4>] (worker_thread+0x2c0/0x3ec)
> [ 7.073822] [<c01466c4>] (worker_thread) from [<c014a6dc>] (kthread+0x134/0x150)
> [ 7.081542] [<c014a6dc>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
> [ 7.089080] Exception stack(0xee23dfb0 to 0xee23dff8)
> [ 7.094360] dfa0: 00000000 00000000 00000000 00000000
> [ 7.102905] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> [ 7.111450] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
> [ 7.118347] Code: e3520000 e5e32001 1afffffb e12fff1e (e4d03001)
> [ 7.127014] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti at linux.it>
> [ 7.586273] ---[ end trace 3a04ee80f8726c81 ]---
> [ 8.385223] cfg80211: Loading compiled-in X.509 certificates for regulatory database
> [ 8.422821] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
> [ 8.446533] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
> [ 8.455566] cfg80211: failed to load regulatory.db
> [ 19.887054] random: crng init done
>
>
> So it seems to be the pwm_bl driver alone which makes trouble...
>
> On a first code scan of https://elixir.bootlin.com/linux/v4.17-rc5/source/drivers/video/backlight/pwm_bl.c
> I couldn't find anything obviously harmful. Except that there is no explicit mechanism for the enable-gpio
> returning -EPROBE_DEFER.
>
> Well, there is one thing: the code seems to require an explicitly specified "power" regulator.
> AFAIR, we don't have such, but the code reports that it substitutes a dummy regulator:
>
> pwm-backlight backlight: backlight supply power not found, using dummy regulator
I have now added several printk to pwm_backlight probe():
[ 6.537994] pwm_backlight_probe
[ 6.554565] omap3isp 480bc000.isp: Revision 15.0 found
[ 6.587829] pwm-backlight backlight: backlight supply power not found, using dummy regulator
[ 6.618377] omap-iommu 480bd400.mmu: 480bd400.mmu: version 1.1
[ 6.665252] wwan_on_off_init: wwan_on_off_init
[ 6.673187] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP CCP2 was not initialized!
[ 6.684143] pwm_backlight_probe 4 err=-517
[ 6.692108] pps_core: LinuxPPS API ver. 1 registered
[ 6.709259] pwm_backlight_probe err=-517
[ 6.714050] (NULL device *): hwmon: 'gta04-battery' is not a valid name attribute, please fix
[ 6.723266] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti at linux.it>
[ 6.734191] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP CSI2a was not initialized!
[ 6.771423] ov9655 1-0030: ov9655_probe
[ 6.775543] ov9655 1-0030: 1-0030 supply dvdd not found, using dummy regulator
[ 6.783538] iio_charge:-747
[ 6.791290] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[ 6.800109] ov9655 1-0030: 1-0030 supply dovdd not found, using dummy regulator
[ 6.810119] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP CCDC was not initialized!
[ 6.830413] pgd = (ptrval)
[ 6.836334] [00000000] *pgd=be109831
[ 6.840118] Internal error: Oops: 17 [#1] PREEMPT SMP ARM
[ 6.845764] Modules linked in: snd_soc_simple_card(+) pps_gpio(+) snd_soc_simple_card_utils snd_soc_omap_twl4030(+) pps_core encoder_opa362 wwan_on_off(+) snd_soc_gtm601 pwm_omap_dmtimer connector_analog_tv generic_adc_battery pwm_bl bq27xxx_battery_hdq bq27xxx_battery omap3_isp(+) bmp280_spi videobuf2_dma_contig wlcore_sdio videobuf2_memops videobuf2_v4l2 videobuf2_common omap_hdq omap2430 ov9655 v4l2_fwnode v4l2_common bmp280_i2c bmp280 at24 tsc2007 videodev bmc150_accel_i2c leds_tca6507 bmc150_magn_i2c bmc150_accel_core bmc150_magn industrialio_triggered_buffer phy_twl4030_usb snd_soc_omap_mcbsp bno055 kfifo_buf media snd_soc_omap snd_pcm_dmaengine musb_hdrc gpio_twl4030 twl4030_charger twl4030_madc snd_soc_twl4030 twl4030_vibra twl4030_pwrbutton industrialio gnss_w2sg0004 gnss w2cbw003_bluetooth
[ 6.919921] ehci_omap omapdss omapdss_base cec
[ 6.924682] CPU: 0 PID: 1151 Comm: udevd Not tainted 4.17.0-rc5-letux+ #2332
[ 6.932037] Hardware name: Generic OMAP36xx (Flattened Device Tree)
[ 6.938598] PC is at strcmp+0x0/0x34
[ 6.942352] LR is at pinctrl_get_group_selector+0x44/0x78
[ 6.947998] pc : [<c070d16c>] lr : [<c0429aac>] psr: a00f0013
[ 6.954559] sp : ee7ebd00 ip : ed232590 fp : 0000001e
[ 6.959991] r10: 0000001d r9 : ed24ce00 r8 : 0000001e
[ 6.965454] r7 : c074dce8 r6 : ef7c4c3c r5 : ee430600 r4 : 0000001b
[ 6.972290] r3 : c0427cf0 r2 : 00000000 r1 : ef7c4c3c r0 : 00000000
[ 6.979095] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
[ 6.986541] Control: 10c5387d Table: ae7f0019 DAC: 00000051
[ 6.992553] Process udevd (pid: 1151, stack limit = 0x(ptrval))
[ 6.998748] Stack: (0xee7ebd00 to 0xee7ec000)
[ 7.003295] bd00: ee430600 ef7c4c3c 00000000 ed1fbc10 00000000 c042aa6c ed249050 00000001
[ 7.011840] bd20: 00000002 ed249080 ed24ce40 ed24ce80 ed1fbc10 00000000 00000000 ed24ce00
[ 7.020385] bd40: 00000000 c04292d4 00000014 ee25be40 c0a58e30 c088091c ee2a7a10 00000000
[ 7.028930] bd60: ed249110 ee2a7a10 c0aca944 fffffdfb bf292020 00000031 00000000 c042949c
[ 7.037475] bd80: 00000000 ee2a7a10 ed2490d0 c04bbb98 ee2a7a10 00000000 c0aca948 c049fe90
[ 7.046020] bda0: ee2a7a10 ee2a7a44 bf292020 c0a632d0 bf292180 bf2921b0 00000000 c04a0140
[ 7.054565] bdc0: ee2a7a10 bf292020 c04a00c0 c049e634 ee01be58 ee220134 bf292020 00000000
[ 7.063110] bde0: ed1e8500 c049f4cc bf291727 bf291728 00000000 bf292020 c0a94300 bf295000
[ 7.071655] be00: 00000000 c04a0ce4 c04a1504 bf292080 c0a94300 c0102d74 014000c0 c07045a0
[ 7.080200] be20: bf2920c8 ed240a48 ed240980 c087ef65 ed23c780 bf292080 00000001 ed240a64
[ 7.088745] be40: ed23c7c0 a00f0013 ed23c800 ed23c780 ee000000 014000c0 bf292080 ee7ebf50
[ 7.097320] be60: bf29208c bf292080 ee7ebf50 ed23c800 00000000 c01a3ffc bf292080 ed23c800
[ 7.105865] be80: bf292080 ee7ebf50 bf29208c c01a2e2c ffff8000 00007fff bf292080 c01a015c
[ 7.114410] bea0: 00000075 c071f138 f0be990c b6d789f8 00000000 00000003 ed02c540 0000295c
[ 7.122955] bec0: 00000000 c0249928 00000003 00000000 00000000 00000000 00000000 00000000
[ 7.131500] bee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 7.140045] bf00: 00000000 00000000 7fffffff 00000000 b6d789f8 00000006 0000017b c01011e4
[ 7.148559] bf20: ee7ea000 00000000 00065fc8 c01a31b0 7fffffff 00000000 00000003 c0213c88
[ 7.157135] bf40: 00000002 f0be7000 0000295c 00000000 f0be7bbe f0be7000 0000295c f0be9394
[ 7.165679] bf60: f0be81b7 f0be8a98 00003000 000031b0 00000000 00000000 00000000 00001c1c
[ 7.174194] bf80: 00000023 00000024 0000001b 00000000 00000017 00000000 b6d797d4 00051f80
[ 7.182769] bfa0: 1a3b3500 c0101000 b6d797d4 00051f80 00000006 b6d789f8 00000000 b6d7931c
[ 7.191314] bfc0: b6d797d4 00051f80 1a3b3500 0000017b 00020000 00037f78 00050048 00065fc8
[ 7.199859] bfe0: be856ee0 be856ed0 b6d72c4b b6e7da42 60070030 00000006 00000000 00000000
[ 7.208404] [<c070d16c>] (strcmp) from [<c0429aac>] (pinctrl_get_group_selector+0x44/0x78)
[ 7.217041] [<c0429aac>] (pinctrl_get_group_selector) from [<c042aa6c>] (pinmux_map_to_setting+0x158/0x1a0)
[ 7.227203] [<c042aa6c>] (pinmux_map_to_setting) from [<c04292d4>] (create_pinctrl+0x1f0/0x2f8)
[ 7.236297] [<c04292d4>] (create_pinctrl) from [<c042949c>] (devm_pinctrl_get+0x2c/0x6c)
[ 7.244750] [<c042949c>] (devm_pinctrl_get) from [<c04bbb98>] (pinctrl_bind_pins+0x3c/0x138)
[ 7.253570] [<c04bbb98>] (pinctrl_bind_pins) from [<c049fe90>] (driver_probe_device+0xe8/0x318)
[ 7.262664] [<c049fe90>] (driver_probe_device) from [<c04a0140>] (__driver_attach+0x80/0xa4)
[ 7.271484] [<c04a0140>] (__driver_attach) from [<c049e634>] (bus_for_each_dev+0x58/0x7c)
[ 7.280029] [<c049e634>] (bus_for_each_dev) from [<c049f4cc>] (bus_add_driver+0xcc/0x1e0)
[ 7.288604] [<c049f4cc>] (bus_add_driver) from [<c04a0ce4>] (driver_register+0x9c/0xe0)
[ 7.296966] [<c04a0ce4>] (driver_register) from [<c0102d74>] (do_one_initcall+0xb4/0x248)
[ 7.305511] [<c0102d74>] (do_one_initcall) from [<c01a3ffc>] (do_init_module+0x58/0x1d0)
[ 7.313934] [<c01a3ffc>] (do_init_module) from [<c01a2e2c>] (load_module+0xe04/0xfb0)
[ 7.322113] [<c01a2e2c>] (load_module) from [<c01a31b0>] (sys_finit_module+0x88/0x90)
[ 7.330291] [<c01a31b0>] (sys_finit_module) from [<c0101000>] (ret_fast_syscall+0x0/0x54)
[ 7.338836] Exception stack(0xee7ebfa8 to 0xee7ebff0)
[ 7.344116] bfa0: b6d797d4 00051f80 00000006 b6d789f8 00000000 b6d7931c
[ 7.352661] bfc0: b6d797d4 00051f80 1a3b3500 0000017b 00020000 00037f78 00050048 00065fc8
[ 7.361206] bfe0: be856ee0 be856ed0 b6d72c4b b6e7da42
[ 7.366485] Code: e3520000 e5e32001 1afffffb e12fff1e (e4d03001)
[ 7.402587] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP preview was not initialized!
[ 7.440429] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP resizer was not initialized!
[ 7.486389] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP AEWB was not initialized!
[ 7.495300] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP AF was not initialized!
[ 7.596343] omap3isp 480bc000.isp: Entity type for entity OMAP3 ISP histogram was not initialized!
[ 7.605743] ov9655 1-0030: __ov9655_set_power on=1
[ 7.776428] ov9655 1-0030: OV9655 read register 1c : ffffff87
[ 7.796295] ov9655 1-0030: OV9655 read register 1d : ffffff87
[ 7.802307] ov9655 1-0030: OV9655 not detected, can't read manufacturer id
[ 7.886779] clk_unregister: unregistering prepared clock: cam_xclka
[ 7.893402] clk_unregister: unregistering prepared clock: cam_xclkb
[ 8.721038] ---[ end trace 48839b1d0305884c ]---
[ 8.759124] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 8.794982] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 8.826293] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[ 8.835296] cfg80211: failed to load regulatory.db
So there is indeed an EPROBE_DEFER involved.
[ 6.684143] pwm_backlight_probe 4 err=-517
This comes from:
pb->pwm = devm_pwm_get(&pdev->dev, NULL);
if (IS_ERR(pb->pwm) && PTR_ERR(pb->pwm) != -EPROBE_DEFER && !node) {
dev_err(&pdev->dev, "unable to request PWM, trying legacy API\n");
pb->legacy = true;
pb->pwm = pwm_request(data->pwm_id, "pwm-backlight");
}
if (IS_ERR(pb->pwm)) {
ret = PTR_ERR(pb->pwm);
if (ret != -EPROBE_DEFER)
dev_err(&pdev->dev, "unable to request PWM\n");
printk("%s 4 err=%d\n", __func__, ret);
goto err_alloc;
}
...
err_alloc:
if (data->exit)
data->exit(&pdev->dev);
printk("%s err=%d\n", __func__, ret);
return ret;
}
This explains why blocking and modprobing manually does not make problems.
And it shows that the problem is probably NOT in the pwm_bl driver, but in
devm_pwm_get().
BR,
Nikolaus
>
>>
>> Then, of course, there is no backlight. I can start it manually with
>>
>> root at letux:~# modprobe pwm_bl
>>
>> I am not sure who the troublemaker is: the omap3isp or the pwm_bl.
>>
>> In any case it seems not to be the driver, because the pinctrl_get_group_selector()
>> is called before the driver is probed.
>>
>> So we either have some other driver which damages the pinctrl groups in a way that
>> those driver fail, or we have a bug in out device tree.
>>
>> Or something with the pinctrl group setup isn't properly locked so that there is
>> a strcmp() on some name before it is initialized.
>>
>> Or some driver has a bad error path so that the deferred_probe_work_func() gets into
>> trouble on the second attempt.
>>
>> I had also tried to read the pinctrl groups by debugfs and if I remember correctly,
>> there were multiple entries of some devices.
>>
>> Anyone with similar experiences?
>> Any ideas how to debug further?
>>
>> BR and thanks,
>> Nikolaus
>>
>
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