[next] Unable to handle kernel NULL pointer dereference at - pc : gpiodevice_release

[Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>]

While running kselftest gpio mockup test case on qualcomm dragonboard 410c
the following kernel crash reported on Linux next tag 20210203.

# selftests: gpio: gpio-mockup.sh
# 1.  Module load tests
# 1.1.  dynamic allocation of gpio
# ./gpio-mockup.sh: line 106: ./gpio-mockup-cdev: No such file or directory
# test failed: line value is 127 when 1 was expected
# GPIO gpio-mockup test FAIL
[  124.539778] Unable to handle kernel NULL pointer dereference at
virtual address 00000000000005a8
[  124.539864] Mem abort info:
[  124.547998]   ESR = 0x96000006
[  124.550188]   EC = 0x25: DABT (current EL), IL = 32 bits
[  124.553473]   SET = 0, FnV = 0
[  124.558926]   EA = 0, S1PTW = 0
[  124.561646] Data abort info:
[  124.564863]   ISV = 0, ISS = 0x00000006
[  124.567933]   CM = 0, WnR = 0
[  124.571507] user pgtable: 4k pages, 48-bit VAs, pgdp=000000008b721000
[  124.574694] [00000000000005a8] pgd=0000000091cd2003,
p4d=0000000091cd2003, pud=00000000917ac003, pmd=0000000000000000
[  124.581396] Internal error: Oops: 96000006 [#1] PREEMPT SMP
[  124.591499] Modules linked in: gpio_mockup(-) snd_soc_hdmi_codec
adv7511 cec rfkill snd_soc_msm8916_analog qcom_spmi_temp_alarm
qcom_pon rtc_pm8xxx msm snd_soc_lpass_apq8016 snd_soc_lpass_cpu
snd_soc_lpass_platform snd_soc_msm8916_digital qcom_camss
videobuf2_dma_sg snd_soc_apq8016_sbc v4l2_fwnode snd_soc_qcom_common
videobuf2_memops videobuf2_v4l2 mdt_loader videobuf2_common
drm_kms_helper qnoc_msm8916 qcom_rng i2c_qcom_cci icc_smd_rpm
crct10dif_ce socinfo rmtfs_mem display_connector drm qrtr ns fuse
[  124.619092] CPU: 0 PID: 5055 Comm: modprobe Not tainted
5.11.0-rc6-next-20210203 #1
[  124.641324] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT)
[  124.648877] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--)
[  124.655819] pc : gpiodevice_release+0x38/0x80
[  124.661806] lr : device_release+0x3c/0x98
[  124.666058] sp : ffff800013f23b30
[  124.670051] x29: ffff800013f23b30 x28: ffff0000157baf80
[  124.673351] x27: 0000000000000000 x26: 0000000000000000
[  124.678734] x25: 0000000000000045 x24: ffff00000b5d6cd0
[  124.684029] x23: ffff800013f23c88 x22: 0000000000000000
[  124.689324] x21: ffff00000fb5f080 x20: ffff000002334e00
[  124.694619] x19: 0000000000000000 x18: ffff800012dd6a50
[  124.699914] x17: 0000000000000000 x16: 0000000000000000
[  124.705210] x15: 00000000000694e0 x14: 00000000ffffffff
[  124.710512] x13: 0000000000000001 x12: 000000000000e107
[  124.715799] x11: 000000000000e10a x10: ffff800012d34a50
[  124.721096] x9 : ffff80001344a000 x8 : 00000000512c1926
[  124.726391] x7 : 000000000cb44760 x6 : ffff800013f23a40
[  124.731685] x5 : dead000000000100 x4 : dead000000000122
[  124.736981] x3 : ffff800012891000 x2 : 2be62a0e7519e400
[  124.742275] x1 : ffff800010829ad0 x0 : ffff800012a694e0
[  124.747571] Call trace:
[  124.752862]  gpiodevice_release+0x38/0x80
[  124.755035]  device_release+0x3c/0x98
[  124.759201]  kobject_put+0x90/0x220
[  124.762846]  put_device+0x24/0x30
[  124.766145]  gpiochip_remove+0xf4/0x120
[  124.769618]  devm_gpio_chip_release+0x20/0x30
[  124.773263]  devm_action_release+0x20/0x30
[  124.777777]  release_nodes+0x150/0x248
[  124.781771]  devres_release_all+0x3c/0x60
[  124.785503]  device_release_driver_internal+0x128/0x1f0
[  124.789584]  driver_detach+0x5c/0xe8
[  124.794618]  bus_remove_driver+0x64/0x118
[  124.798439]  driver_unregister+0x34/0x60
[  124.802344]  platform_driver_unregister+0x20/0x30
[  124.806339]  gpio_mockup_exit+0x30/0x3d0 [gpio_mockup]
[  124.810939]  __arm64_sys_delete_module+0x1c8/0x2b8
[  124.815973]  el0_svc_common+0x88/0x1b8
[  124.820745]  do_el0_svc+0x38/0x90
[  124.824478]  el0_svc+0x1c/0x28
[  124.827864]  el0_sync_handler+0x8c/0xb0
[  124.830815]  el0_sync+0x13c/0x140
[  124.834555] Code: f2fbd5a4 90011200 91124000 91014000 (f942d663)
[  124.838029] ---[ end trace 15e9a0840604e538 ]---

Reported-by: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>

full test log link,
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20210203/testrun/3878290/suite/linux-log-parser/test/check-kernel-oops-2224485/log

metadata:
  git branch: master
  git repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
  git describe: next-20210203
  kernel-config:
http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/dragonboard-410c/lkft/linux-next/952/config
  build: http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/dragonboard-410c/lkft/linux-next/952/
vmlinux: http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/dragonboard-410c/lkft/linux-next/952/vmlinux


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https://lkft.linaro.org