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Message-ID: <5879304.DvuYhMxLoT@lukas-hpz440workstation>
Date: Sat, 05 Apr 2025 13:48:25 +0200
From: Lukas Schmid <lukas.schmid@...cube.li>
To: linus.walleij@...aro.org
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject:
[BUG] pinctrl_mcp23s08_i2c: mutex used in irq_bus_lock causes 'scheduling
while atomic' with matrix_keypad
Hi all,
I'm encountering a "BUG: scheduling while atomic" when using the MCP23017 GPIO
expander with the `matrix_keypad` driver in IRQ mode on Linux v6.12.20
Hardware setup:
- MCP23017 connected via I2C
- 4x4 matrix keypad hooked to MCP23017 GPIOs
- SoC: Allwinner V3s SoC
- Using devicetree-overlay configuration for `microchip,mcp23017` and `gpio-
matrix-keypad`
When I press buttons on the keypad, after some amount of presses I get the
following error from the Kernel:
[ 92.820159] BUG: scheduling while atomic: kworker/0:2/46/0x00000002
[ 92.826577] Modules linked in: bluetooth ecdh_generic ecc cfg80211 rfkill
ipv6 af_packet evdev mcp251xfd can_dev matrix_keypad matrix_keymap
gpio_pcf857x pinctrl_mcp23s08_i2c pinctrl_mcp23s08 hd44780 hd44780_common
charlcd sun4i_ss libdes sun4i_codec sun8i_codec_analog sun8i_adda_pr_regmap
snd_soc_core snd_pcm_dmaengine snd_pcm snd_timer snd soundcore uio_pdrv_genirq
uio [last unloaded: esp32_sdio(O)]
[ 92.862336] CPU: 0 UID: 0 PID: 46 Comm: kworker/0:2 Tainted: G O
6.12.20 #1
[ 92.862362] Tainted: [O]=OOT_MODULE
[ 92.862368] Hardware name: Allwinner sun8i Family
[ 92.862378] Workqueue: events matrix_keypad_scan [matrix_keypad]
[ 92.862415] Call trace:
[ 92.862429] unwind_backtrace from show_stack+0x18/0x1c
[ 92.862469] show_stack from dump_stack_lvl+0x68/0x74
[ 92.862490] dump_stack_lvl from __schedule_bug+0x5c/0x70
[ 92.862518] __schedule_bug from __schedule+0xab4/0xc94
[ 92.862541] __schedule from schedule+0x34/0x14c
[ 92.862560] schedule from schedule_preempt_disabled+0x24/0x34
[ 92.862580] schedule_preempt_disabled from __mutex_lock.constprop.
0+0x2e4/0x940
[ 92.862605] __mutex_lock.constprop.0 from mcp23s08_irq_bus_lock+0x20/0x30
[pinctrl_mcp23s08]
[ 92.862650] mcp23s08_irq_bus_lock [pinctrl_mcp23s08] from
__irq_get_desc_lock+0x84/0xa8
[ 92.862682] __irq_get_desc_lock from enable_irq+0x38/0xa8
[ 92.862710] enable_irq from matrix_keypad_scan+0x2e0/0x324 [matrix_keypad]
[ 92.862738] matrix_keypad_scan [matrix_keypad] from
process_one_work+0x160/0x410
[ 92.862763] process_one_work from worker_thread+0x258/0x3f8
[ 92.862782] worker_thread from kthread+0x118/0x134
[ 92.862801] kthread from ret_from_fork+0x14/0x38
[ 92.862817] Exception stack(0xc4989fb0 to 0xc4989ff8)
[ 92.862829] 9fa0: 00000000 00000000
00000000 00000000
[ 92.862840] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000
[ 92.862849] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 93.007968] BUG: workqueue leaked atomic, lock or RCU: kworker/0:2[46]
[ 93.007968] preempt=0xffffffff lock=0->0 RCU=0->0
workfn=matrix_keypad_scan [matrix_keypad]
[ 93.008051] CPU: 0 UID: 0 PID: 46 Comm: kworker/0:2 Tainted: G W O
6.12.20 #1
[ 93.008071] Tainted: [W]=WARN, [O]=OOT_MODULE
[ 93.008076] Hardware name: Allwinner sun8i Family
[ 93.008085] Workqueue: events matrix_keypad_scan [matrix_keypad]
[ 93.008108] Call trace:
[ 93.008121] unwind_backtrace from show_stack+0x18/0x1c
[ 93.008158] show_stack from dump_stack_lvl+0x68/0x74
[ 93.008179] dump_stack_lvl from process_one_work+0x40c/0x410
[ 93.008202] process_one_work from worker_thread+0x258/0x3f8
[ 93.008221] worker_thread from kthread+0x118/0x134
[ 93.008240] kthread from ret_from_fork+0x14/0x38
[ 93.008256] Exception stack(0xc4989fb0 to 0xc4989ff8)
[ 93.008267] 9fa0: 00000000 00000000
00000000 00000000
[ 93.008277] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000
[ 93.008286] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 93.008300] BUG: scheduling while atomic: kworker/0:2/46/0x00000000
[ 93.115583] Modules linked in: bluetooth ecdh_generic ecc cfg80211 rfkill
ipv6 af_packet evdev mcp251xfd can_dev matrix_keypad matrix_keymap
gpio_pcf857x pinctrl_mcp23s08_i2c pinctrl_mcp23s08 hd44780 hd44780_common
charlcd sun4i_ss libdes sun4i_codec sun8i_codec_analog sun8i_adda_pr_regmap
snd_soc_core snd_pcm_dmaengine snd_pcm snd_timer snd soundcore uio_pdrv_genirq
uio [last unloaded: esp32_sdio(O)]
[ 93.151453] CPU: 0 UID: 0 PID: 46 Comm: kworker/0:2 Tainted: G W O
6.12.20 #1
[ 93.151483] Tainted: [W]=WARN, [O]=OOT_MODULE
[ 93.151488] Hardware name: Allwinner sun8i Family
[ 93.151496] Workqueue: 0x0 (events)
[ 93.151525] Call trace:
[ 93.151537] unwind_backtrace from show_stack+0x18/0x1c
[ 93.151570] show_stack from dump_stack_lvl+0x68/0x74
[ 93.151589] dump_stack_lvl from __schedule_bug+0x5c/0x70
[ 93.151615] __schedule_bug from __schedule+0xab4/0xc94
[ 93.151640] __schedule from schedule+0x34/0x14c
[ 93.151659] schedule from worker_thread+0x1c8/0x3f8
[ 93.151681] worker_thread from kthread+0x118/0x134
[ 93.151698] kthread from ret_from_fork+0x14/0x38
[ 93.151713] Exception stack(0xc4989fb0 to 0xc4989ff8)
[ 93.151725] 9fa0: 00000000 00000000
00000000 00000000
[ 93.151736] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000
[ 93.151746] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
Happy to test patches or provide further debugging info.
Best regards,
Lukas Schmid
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