WARNING: possible recursive locking detected - lock(&irq_desc_lock_class);

WARNING: possible recursive locking detected - lock(&irq_desc_lock_class);

[Naresh Kamboju]

While booting linux mainline kernel v5.17.0 on arm64 dragonboard 845c
the following kernel deadlock warning was noticed.

This build config is generated by kselftest-merge configs.

[   11.472323] qcom_q6v5_pas remoteproc-adsp: supply cx not found,
using dummy regulator
[   11.482690] qcom_q6v5_pas remoteproc-adsp: supply px not found,
using dummy regulator
[   11.643728] qcom,slim-ngd-ctrl 171c0000.slim: Adding to iommu group 1
[   11.647956] NET: Registered PF_QIPCRTR protocol family
[   11.655652] failed to send lookup registration: -19
[   11.679730] remoteproc remoteproc0: remoteproc-adsp is available
[   11.688073] remoteproc remoteproc0: Direct firmware load for
qcom/sdm845/adsp.mbn failed with error -2
[   11.698131] remoteproc remoteproc0: powering up remoteproc-adsp
[   11.704730] remoteproc remoteproc0: Direct firmware load for
qcom/sdm845/adsp.mbn failed with error -2
[   11.714571] remoteproc remoteproc0: request_firmware failed: -2
[   11.753156] cpu cpu0: EM: created perf domain
[   11.773034]
[   11.774570] ============================================
[   11.779933] WARNING: possible recursive locking detected
[   11.785303] 5.17.0 #1 Not tainted
[   11.788662] --------------------------------------------
[   11.794029] kworker/u16:2/80 is trying to acquire lock:
[   11.798293] qcom_q6v5_pas remoteproc-cdsp: supply cx not found,
using dummy regulator
[   11.799312] ffff7e0cc11b28f8 (&irq_desc_lock_class){-.-.}-{2:2},
at: __irq_get_desc_lock+0x64/0xa4
[   11.816285]
[   11.816285] but task is already holding lock:
[   11.822173] ffff7e0cc0fd38f8 (&irq_desc_lock_class){-.-.}-{2:2},
at: __irq_get_desc_lock+0x64/0xa4
[   11.823425] qcom_q6v5_pas remoteproc-cdsp: supply px not found,
using dummy regulator
[   11.831231]
[   11.831231] other info that might help us debug this:
[   11.831234]  Possible unsafe locking scenario:
[   11.831234]
[   11.831236]        CPU0
[   11.831238]        ----
[   11.831240]   lock(&irq_desc_lock_class);
[   11.831245]   lock(&irq_desc_lock_class);
[   11.831251]
[   11.831251]  *** DEADLOCK ***
[   11.831251]
[   11.831253]  May be due to missing lock nesting notation
[   11.831253]
[   11.831255] 6 locks held by kworker/u16:2/80:
[   11.831259]  #0: ffff7e0cc0018d38
((wq_completion)events_unbound){+.+.}-{0:0}, at:
process_one_work+0x1e8/0x6f4
[   11.862787] cfg80211: Loading compiled-in X.509 certificates for
regulatory database
[   11.864788]  #1: ffff800008673dd0
(deferred_probe_work){+.+.}-{0:0}, at: process_one_work+0x1e8/0x6f4
[   11.864808]  #2: ffff7e0cc12bf188 (&dev->mutex
[   11.882336] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[   11.892239] ){....}-{3:3}, at: __device_attach+0x44/0x1c0
[   11.892255]  #3: ffffb99e189d0870 (cpu_hotplug_lock){++++}-{0:0},
at: cpus_read_lock+0x1c/0x30
[   11.892276]  #4:
[   11.900398] platform regulatory.0: Direct firmware load for
regulatory.db failed with error -2
[   11.909407] ffff7e0cc0f98918 (subsys mutex#8){+.+.}-{3:3}, at:
subsys_interface_register+0x64/0x150
[   11.909429]  #5: ffff7e0cc0fd38f8
(&irq_desc_lock_class){-.-.}-{2:2}, at: __irq_get_desc_lock+0x64/0xa4
[   11.913956] cfg80211: failed to load regulatory.db
[   11.920518]
[   11.920518] stack backtrace:
[   11.920523] CPU: 4 PID: 80 Comm: kworker/u16:2 Not tainted 5.17.0 #1
[   11.920530] Hardware name: Thundercomm Dragonboard 845c (DT)
[   11.920535] Workqueue: events_unbound deferred_probe_work_func
[   11.957146] remoteproc remoteproc1: remoteproc-cdsp is available
[   11.963917]
[   11.963921] Call trace:
[   11.963924]  dump_backtrace+0xf8/0x130
[   11.963933]  show_stack+0x24/0x80
[   11.963937]  dump_stack_lvl+0x8c/0xb8
[   11.963948]  dump_stack+0x18/0x34
[   11.985142] remoteproc remoteproc1: Direct firmware load for
qcom/sdm845/cdsp.mbn failed with error -2
[   11.985323]  __lock_acquire+0xbc8/0x20cc
[   11.991270] remoteproc remoteproc1: powering up remoteproc-cdsp
[   11.997292]  lock_acquire.part.0+0xe0/0x230
[   11.997301]  lock_acquire+0x68/0x84
[   11.997309]  _raw_spin_lock_irqsave+0x88/0x150
[   11.997317]  __irq_get_desc_lock+0x64/0xa4
[   11.997324]  enable_irq+0x40/0xb0
[   11.998891] remoteproc remoteproc1: Direct firmware load for
qcom/sdm845/cdsp.mbn failed with error -2
[   12.001316]  lmh_enable_interrupt+0x38/0x44 [lmh]
[   12.001329]  irq_enable+0x4c/0xa0
[   12.001337]  __irq_startup+0x80/0xb0
[   12.005282] remoteproc remoteproc1: request_firmware failed: -2
[   12.008487]  irq_startup+0x84/0x174
[   12.008495]  __enable_irq+0x7c/0x90
[   12.008501]  enable_irq+0x54/0xb0
[   12.008508]  qcom_cpufreq_ready+0x2c/0x3c
[   12.096152]  cpufreq_online+0x5a8/0xa60
[   12.096160]  cpufreq_add_dev+0xc8/0xe0
[   12.096167]  subsys_interface_register+0x138/0x150
[   12.096176]  cpufreq_register_driver+0x180/0x300
 OK   Started udev Coldplug all Devices.[   12.113357]
qcom_cpufreq_hw_driver_probe+0xe0/0x150
[   12.123101]  platform_probe+0x74/0xf0
[   12.126994]  really_probe+0x1c4/0x440
[   12.130706]  __driver_probe_device+0x11c/0x190
[   12.135201]  driver_probe_device+0x48/0x104
[   12.139429]  __device_attach_driver+0xa4/0x140
[   12.143927]  bus_for_each_drv+0x84/0xe0
[   12.147810]  __device_attach+0xe4/0x1c0
[   12.151695]  device_initial_probe+0x20/0x30
[   12.155934]  bus_probe_device+0xac/0xb4
[   12.159817]  deferred_probe_work_func+0xc8/0x120
[   12.164486]  process_one_work+0x280/0x6f4
[   12.168540]  worker_thread+0x80/0x450
[   12.172256]  kthread+0x10c/0x120
[   12.172264]  ret_from_fork+0x10/0x20

Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>

metadata:
  git_ref: master
  git_repo: https://gitlab.com/Linaro/lkft/mirrors/torvalds/linux-mainline
  git_sha: f443e374ae131c168a065ea1748feac6b2e76613
  git_describe: v5.17
  kernel_version: 5.17.0
  kernel-config: https://builds.tuxbuild.com/26fPPSbBmMfOqElIN3NGgvUWHeW/config


--
Linaro LKFT
https://lkft.linaro.org
[1] https://lkft.validation.linaro.org/scheduler/job/4754457#L3342