linux-kernel - [BUG report] There was BUG when executed gpio kselftest

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Message-ID: <YywKjcqs0U39WSWD@xpf.sh.intel.com>
Date:   Thu, 22 Sep 2022 15:11:09 +0800
From:   Pengfei Xu <pengfei.xu@...el.com>
To:     <linux-kernel@...r.kernel.org>, <linux-gpio@...r.kernel.org>
CC:     <heng.su@...el.com>, <pengfei.xu@...el.com>
Subject: [BUG report] There was BUG when executed gpio kselftest

Hi gpio and LKML developers,

Greeting!

Platform: TGL-U platform
Kernel: 6.0-rc6 mainline

When executed gpio kselftest:
tools/testing/selftests/gpio/gpio-mockup.sh

# ./gpio/gpio-mockup.sh
test failed: can't remove existing gpio-mockup module
GPIO gpio-mockup test FAIL
# lsmod  | grep gpio
gpio_mockup            16384  -1

At the step "modprobe -r -q gpio_mockup", there was BUG info in dmesg:

[   43.928611] gpiochip_find_base: found new base at 632
...
[   44.021733] gpio gpiochip1: registered chardev handle for 1 lines
[   44.036775] BUG: kernel NULL pointer dereference, address: 00000000000000a0
[   44.036816] #PF: supervisor write access in kernel mode
[   44.036833] #PF: error_code(0x0002) - not-present page
...
[   44.037213] Call Trace:
[   44.037223]  <TASK>
[   44.037235]  simple_recursive_removal+0x9d/0x2a0
[   44.037255]  ? debugfs_lookup_and_remove+0x40/0x40
[   44.037276]  ? preempt_count_add+0x7c/0xc0

Dmesg is in attached.

Thanks!

View attachment "20220922_tglu_unload_gpio_mockup_bug.txt" of type "text/plain" (134194 bytes)