BUG: key ffff000800eba398 has not been registered!

[Naresh Kamboju]

While running kselftest recently added gpio gpio-sim.sh test case the following
warning was triggered on Linux next tag 20210330 tag running on arm64 juno
and hikey devices.

GOOD: next-20210326
BAD: next-20210330

# selftests: gpio: gpio-sim.sh
# 1. chip_name and dev_name attributes
# 1.1. Chip name is communicated to user
[  143.081193] BUG: key ffff000800eba398 has not been registered!
[  143.087326] ------------[ cut here ]------------
[  143.091987] DEBUG_LOCKS_WARN_ON(1)
[  143.092005] WARNING: CPU: 1 PID: 1821 at
/usr/src/kernel/kernel/locking/lockdep.c:4688
lockdep_init_map_type+0xf0/0x298
[  143.106223] Modules linked in: gpio_sim rfkill tda998x cec
drm_kms_helper drm crct10dif_ce fuse [last unloaded: gpio_mockup]
[  143.117495] CPU: 1 PID: 1821 Comm: mv Not tainted 5.12.0-rc5-next-20210330 #1
[  143.124645] Hardware name: ARM Juno development board (r2) (DT)
[  143.130572] pstate: 40000005 (nZcv daif -PAN -UAO -TCO BTYPE=--)
[  143.136589] pc : lockdep_init_map_type+0xf0/0x298
[  143.141302] lr : lockdep_init_map_type+0xf0/0x298
[  143.146014] sp : ffff800013fb3560
[  143.149330] x29: ffff800013fb3560 x28: 00000000ffffee4b
[  143.154655] x27: 00000000000011b4 x26: 0000000000001000
[  143.159979] x25: ffff000800eba380 x24: 0000000000000000
[  143.165303] x23: 0000000000000000 x22: 0000000000000000
[  143.170626] x21: ffff80001382b000 x20: ffff000800eba398
[  143.175949] x19: ffff000827ac32a8 x18: ffffffffffffffff
[  143.181273] x17: 0000000000000000 x16: 0000000000000000
[  143.186595] x15: ffff800012900a88 x14: ffff800093fb3167
[  143.191918] x13: ffff800013fb3175 x12: 000000000000a0ec
[  143.197241] x11: 0000000005f5e0ff x10: ffff800013fb30c0
[  143.202565] x9 : ffff800013fb3560 x8 : 4e5241575f534b43
[  143.207888] x7 : ffff800012989ad8 x6 : ffff800013fb3180
[  143.213211] x5 : 0000000000000001 x4 : 0000000000000001
[  143.218534] x3 : ffff800012901000 x2 : 0000000000000000
[  143.223856] x1 : b4b7acac5f71bc00 x0 : 0000000000000000
[  143.229180] Call trace:
[  143.231625]  lockdep_init_map_type+0xf0/0x298
[  143.235989]  __kernfs_create_file+0xa8/0x1d0
[  143.240268]  sysfs_add_file_mode_ns+0xa8/0x1f8
[  143.244718]  internal_create_group+0x118/0x420
[  143.249169]  sysfs_create_group+0x2c/0x38
[  143.253185]  gpio_sim_probe+0x358/0x3c0 [gpio_sim]
[  143.257995]  platform_probe+0x6c/0xd8
[  143.261663]  really_probe+0x16c/0x508
[  143.265332]  driver_probe_device+0x104/0x178
[  143.269610]  __device_attach_driver+0xa4/0x130
[  143.274062]  bus_for_each_drv+0x78/0xd8
[  143.277903]  __device_attach+0xf0/0x178
[  143.281745]  device_initial_probe+0x24/0x30
[  143.285935]  bus_probe_device+0xa0/0xa8
[  143.289776]  device_add+0x424/0x810
[  143.293270]  platform_device_add+0x12c/0x2c0
[  143.297545]  platform_device_register_full+0x124/0x150
[  143.302692]  gpio_sim_config_commit_item+0x160/0x1e0 [gpio_sim]
[  143.308628]  configfs_rename+0x1dc/0x220
[  143.312557]  vfs_rename+0x394/0x960
[  143.316051]  do_renameat2+0x408/0x4c0
[  143.319718]  __arm64_sys_renameat+0x5c/0x70
[  143.323908]  el0_svc_common+0x7c/0x158
[  143.327665]  do_el0_svc+0x38/0x90
[  143.330985]  el0_svc+0x20/0x30
[  143.334045]  el0_sync_handler+0x8c/0xb0
[  143.337886]  el0_sync+0x13c/0x140
[  143.341204] irq event stamp: 5607
[  143.344520] hardirqs last  enabled at (5607): [<ffff800011462dd8>]
_raw_spin_unlock_irq+0x48/0x90
[  143.353410] hardirqs last disabled at (5606): [<ffff8000114586c4>]
__schedule+0x364/0x950
[  143.361605] softirqs last  enabled at (5602): [<ffff800010010958>]
__do_softirq+0x510/0x63c
[  143.369971] softirqs last disabled at (5577): [<ffff8000100a7474>]
irq_exit+0x1b4/0x1c0
[  143.377992] ---[ end trace bc3c86ef609281aa ]---
# 1.2. chip_name returns 'none' if the chip is still pending

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

metadata:
  git branch: master
  git repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
  git describe: next-20210330
  kernel-config:
http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/juno/lkft/linux-next/995/config

Full test log link,
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20210330/testrun/4268728/suite/linux-log-parser/test/check-kernel-bug-2463256/log

git log --oneline next-20210326..next-20210330  -- tools/testing/selftests/gpio/
9d940ab72645 selftests: gpio: add test cases for gpio-sim
8a4cb2823240 selftests: gpio: add a helper for reading GPIO line names
ab1dbed6f4e8 selftests: gpio: provide a helper for reading chip info

-- 
Linaro LKFT
https://lkft.linaro.org