Just adding some info, 5.3.y has the same issue. On Thursday, January 9, 2020 at 9:55:54 AM UTC-3, @lex wrote: > > I asked this because i have not touched the pwm-sun4i driver code, Only > the MIPI-DSI on top of 5.4.8. > > On Thursday, January 9, 2020 at 9:25:11 AM UTC-3, @lex wrote: >> >> Thank you Vasily for the explanation. >> >> Is this a known bug or i have possibly introduced it while patching the >> kernel? >> >> On Wednesday, January 8, 2020 at 9:51:03 PM UTC-3, Vasily Khoruzhick >> wrote: >>> >>> The issue is that sun4i_pwm_apply() calls sun4i_pwm_calculate() which >>> calls clk_get_rate() while holding a spinlock and clk_get_rate() may >>> sleep. >>> >>> It's a bug in pwm-sun4i driver. >>> >>> On Wed, Jan 8, 2020 at 4:19 PM @lex <[email protected]> wrote: >>> > >>> > I am doing some experiments with LCD7" with the kernel 5.4.8 and >>> occasionally i get this crash. >>> > Can someone explain or give some directions on how to find the >>> offending error based on the crash log? Any idea what could be causing >>> this? >>> > >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.681388] BUG: scheduling >>> while atomic: gsd-backlight-h/3978/0x00000002 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688221] Modules linked in: >>> fuse rfkill dw_hdmi_i2s_audio snd_soc_hdmi_codec >>> panel_feiyang_fy07024di26a30d sunxi_cedrus(C) v4l2_mem2mem crct10dif_ce >>> sun8i_drm_hdmi videobuf2_dma_contig snd_soc_spdif_tx dw_hdmi >>> videobuf2_memops axp20x_adc cec videobuf2_v4l2 snd_soc_simple_card >>> sunxi_cir axp20x_usb_power axp20x_ac_power snd_soc_simple_card_utils >>> pinctrl_axp209 axp20x_battery phy_sun6i_mipi_dphy rc_core videobuf2_common >>> mali(O) sun6i_mipi_dsi sun50i_codec_analog videodev sun8i_adda_pr_regmap >>> crc_ccitt goodix sun8i_codec sun4i_i2s mc sun4i_drm sun4i_frontend >>> sun4i_tcon sun8i_mixer sun8i_tcon_top pwm_bl ip_tables x_tables ipv6 >>> nf_defrag_ipv6 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688331] CPU: 3 PID: 3978 >>> Comm: gsd-backlight-h Tainted: G C O 5.4.8 #1 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688334] Hardware name: >>> Pine64+ (DT) >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688339] Call trace: >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688357] >>> dump_backtrace+0x0/0x150 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688364] >>> show_stack+0x14/0x20 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688374] >>> dump_stack+0xb4/0xd8 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688384] >>> __schedule_bug+0x50/0x70 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688392] >>> __schedule+0x4bc/0x510 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688397] schedule+0x40/0xd0 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688403] >>> schedule_preempt_disabled+0x20/0x38 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688410] >>> __mutex_lock.isra.10+0x150/0x568 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688416] >>> __mutex_lock_slowpath+0x10/0x18 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688422] >>> mutex_lock+0x38/0x40 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688430] >>> clk_prepare_lock+0x40/0xa0 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688437] >>> clk_get_rate+0x1c/0x70 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688446] >>> sun4i_pwm_apply+0xb4/0x450 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688453] >>> pwm_apply_state+0x64/0x1e8 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688464] >>> pwm_backlight_update_status+0xb8/0x198 [pwm_bl] >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688473] >>> backlight_device_set_brightness+0x64/0xb8 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688480] >>> brightness_store+0x78/0x90 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688488] >>> dev_attr_store+0x14/0x28 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688496] >>> sysfs_kf_write+0x3c/0x50 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688501] >>> kernfs_fop_write+0x144/0x230 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688511] >>> __vfs_write+0x18/0x38 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688517] >>> vfs_write+0xb4/0x1e0 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688524] >>> ksys_write+0x68/0xf8 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688530] >>> __arm64_sys_write+0x18/0x20 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688540] >>> el0_svc_common.constprop.2+0x64/0x160 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688547] >>> el0_svc_handler+0x20/0x80 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688552] el0_svc+0x8/0xc >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688694] BUG: scheduling >>> while atomic: gsd-backlight-h/3978/0x00000000 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695480] Modules linked in: >>> fuse rfkill dw_hdmi_i2s_audio snd_soc_hdmi_codec >>> panel_feiyang_fy07024di26a30d sunxi_cedrus(C) v4l2_mem2mem crct10dif_ce >>> sun8i_drm_hdmi videobuf2_dma_contig snd_soc_spdif_tx dw_hdmi >>> videobuf2_memops axp20x_adc cec videobuf2_v4l2 snd_soc_simple_card >>> sunxi_cir axp20x_usb_power axp20x_ac_power snd_soc_simple_card_utils >>> pinctrl_axp209 axp20x_battery phy_sun6i_mipi_dphy rc_core videobuf2_common >>> mali(O) sun6i_mipi_dsi sun50i_codec_analog videodev sun8i_adda_pr_regmap >>> crc_ccitt goodix sun8i_codec sun4i_i2s mc sun4i_drm sun4i_frontend >>> sun4i_tcon sun8i_mixer sun8i_tcon_top pwm_bl ip_tables x_tables ipv6 >>> nf_defrag_ipv6 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695558] CPU: 3 PID: 3978 >>> Comm: gsd-backlight-h Tainted: G WC O 5.4.8 #1 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695561] Hardware name: >>> Pine64+ (DT) >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695564] Call trace: >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695579] >>> dump_backtrace+0x0/0x150 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695583] >>> show_stack+0x14/0x20 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695591] >>> dump_stack+0xb4/0xd8 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695600] >>> __schedule_bug+0x50/0x70 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695605] >>> __schedule+0x4bc/0x510 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695610] schedule+0x40/0xd0 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695615] >>> do_notify_resume+0x1e0/0x398 >>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695620] >>> work_pending+0x8/0x10 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.894318] BUG: scheduling >>> while atomic: gsd-backlight-h/3987/0x00000002 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901147] Modules linked in: >>> fuse rfkill dw_hdmi_i2s_audio snd_soc_hdmi_codec >>> panel_feiyang_fy07024di26a30d sunxi_cedrus(C) v4l2_mem2mem crct10dif_ce >>> sun8i_drm_hdmi videobuf2_dma_contig snd_soc_spdif_tx dw_hdmi >>> videobuf2_memops axp20x_adc cec videobuf2_v4l2 snd_soc_simple_card >>> sunxi_cir axp20x_usb_power axp20x_ac_power snd_soc_simple_card_utils >>> pinctrl_axp209 axp20x_battery phy_sun6i_mipi_dphy rc_core videobuf2_common >>> mali(O) sun6i_mipi_dsi sun50i_codec_analog videodev sun8i_adda_pr_regmap >>> crc_ccitt goodix sun8i_codec sun4i_i2s mc sun4i_drm sun4i_frontend >>> sun4i_tcon sun8i_mixer sun8i_tcon_top pwm_bl ip_tables x_tables ipv6 >>> nf_defrag_ipv6 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901246] CPU: 0 PID: 3987 >>> Comm: gsd-backlight-h Tainted: G WC O 5.4.8 #1 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901250] Hardware name: >>> Pine64+ (DT) >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901254] Call trace: >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901271] >>> dump_backtrace+0x0/0x150 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901277] >>> show_stack+0x14/0x20 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901286] >>> dump_stack+0xb4/0xd8 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901296] >>> __schedule_bug+0x50/0x70 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901303] >>> __schedule+0x4bc/0x510 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901307] schedule+0x40/0xd0 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901313] >>> schedule_preempt_disabled+0x20/0x38 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901319] >>> __mutex_lock.isra.10+0x150/0x568 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901324] >>> __mutex_lock_slowpath+0x10/0x18 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901330] >>> mutex_lock+0x38/0x40 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901337] >>> clk_prepare_lock+0x40/0xa0 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901343] >>> clk_get_rate+0x1c/0x70 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901352] >>> sun4i_pwm_apply+0xb4/0x450 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901357] >>> pwm_apply_state+0x64/0x1e8 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901368] >>> pwm_backlight_update_status+0xb8/0x198 [pwm_bl] >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901375] >>> backlight_device_set_brightness+0x64/0xb8 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901381] >>> brightness_store+0x78/0x90 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901389] >>> dev_attr_store+0x14/0x28 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901396] >>> sysfs_kf_write+0x3c/0x50 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901401] >>> kernfs_fop_write+0x144/0x230 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901409] >>> __vfs_write+0x18/0x38 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901415] >>> vfs_write+0xb4/0x1e0 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901421] >>> ksys_write+0x68/0xf8 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901427] >>> __arm64_sys_write+0x18/0x20 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901435] >>> el0_svc_common.constprop.2+0x64/0x160 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901441] >>> el0_svc_handler+0x20/0x80 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901446] el0_svc+0x8/0xc >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901612] BUG: scheduling >>> while atomic: gsd-backlight-h/3987/0x00000000 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908388] Modules linked in: >>> fuse rfkill dw_hdmi_i2s_audio snd_soc_hdmi_codec >>> panel_feiyang_fy07024di26a30d sunxi_cedrus(C) v4l2_mem2mem crct10dif_ce >>> sun8i_drm_hdmi videobuf2_dma_contig snd_soc_spdif_tx dw_hdmi >>> videobuf2_memops axp20x_adc cec videobuf2_v4l2 snd_soc_simple_card >>> sunxi_cir axp20x_usb_power axp20x_ac_power snd_soc_simple_card_utils >>> pinctrl_axp209 axp20x_battery phy_sun6i_mipi_dphy rc_core videobuf2_common >>> mali(O) sun6i_mipi_dsi sun50i_codec_analog videodev sun8i_adda_pr_regmap >>> crc_ccitt goodix sun8i_codec sun4i_i2s mc sun4i_drm sun4i_frontend >>> sun4i_tcon sun8i_mixer sun8i_tcon_top pwm_bl ip_tables x_tables ipv6 >>> nf_defrag_ipv6 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908479] CPU: 0 PID: 3987 >>> Comm: gsd-backlight-h Tainted: G WC O 5.4.8 #1 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908482] Hardware name: >>> Pine64+ (DT) >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908486] Call trace: >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908500] >>> dump_backtrace+0x0/0x150 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908507] >>> show_stack+0x14/0x20 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908517] >>> dump_stack+0xb4/0xd8 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908526] >>> __schedule_bug+0x50/0x70 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908533] >>> __schedule+0x4bc/0x510 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908538] schedule+0x40/0xd0 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908545] >>> do_notify_resume+0x1e0/0x398 >>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908551] >>> work_pending+0x8/0x10 >>> > >>> > >>> > >>> > B.R >>> > >>> > -- >>> > You received this message because you are subscribed to the Google >>> Groups "linux-sunxi" group. >>> > To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> > To view this discussion on the web, visit >>> https://groups.google.com/d/msgid/linux-sunxi/91a0725f-5ce3-4244-ba98-88c1ea7e7574%40googlegroups.com. >>> >>> >>> >>
-- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/a6a5a51d-1fe5-4eef-bbd1-c285260f8fd4%40googlegroups.com.
