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Subject[db845c] WARNING: possible recursive locking detected - lock(&irq_desc_lock_class)
Following kernel DEADLOCK warning noticed on arm64 Qcom db845c device while
booting the device with kselftest merge config build image [1] & [2].

metadata:
git_ref: master
git_repo: https://gitlab.com/Linaro/lkft/mirrors/torvalds/linux-mainline
git_sha: 672c0c5173427e6b3e2a9bbb7be51ceeec78093a
git_describe: v5.18-rc5
kernel_version: 5.18.0-rc5
kernel-config: https://builds.tuxbuild.com/28a2o8LHusNjoIzC0DyjxMuD9pA/config
vmlinux.xz: https://builds.tuxbuild.com/28a2o8LHusNjoIzC0DyjxMuD9pA/vmlinux.xz
System.map: https://builds.tuxbuild.com/28a2o8LHusNjoIzC0DyjxMuD9pA/System.map
artifact-location: https://builds.tuxbuild.com/28a2o8LHusNjoIzC0DyjxMuD9pA
toolchain: gcc-11


Test log:
---------
[ 12.978152] cpu cpu0: EM: created perf domain
[ 12.984226] remoteproc remoteproc0: request_firmware failed: -2
[ 12.991986]
[ 12.996140] ============================================
[ 13.001506] WARNING: possible recursive locking detected
[ 13.006874] 5.18.0-rc5 #1 Not tainted
[ 13.010584] --------------------------------------------
[ 13.015946] kworker/u16:9/254 is trying to acquire lock:
[ 13.019488] qcom_q6v5_pas remoteproc-cdsp: supply cx not found,
using dummy regulator
[ 13.021314] ffff09e7811f8cf8 (&irq_desc_lock_class){-.-.}-{2:2},
at: __irq_get_desc_lock+0x64/0xa4
[ 13.021342]
[ 13.021342] but task is already holding lock:
[ 13.021344] ffff09e785f4c0f8
[ 13.037483] qcom_q6v5_pas remoteproc-cdsp: supply px not found,
using dummy regulator
[ 13.038298] (&irq_desc_lock_class
[ 13.044607] cfg80211: Loading compiled-in X.509 certificates for
regulatory database
[ 13.047108] ){-.-.}-{2:2}, at: __irq_get_desc_lock+0x64/0xa4
[ 13.047116]
[ 13.047116] other info that might help us debug this:
[ 13.074565] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 13.078588] Possible unsafe locking scenario:
[ 13.078588]
[ 13.078591] CPU0
[ 13.078593] ----
[ 13.078595] lock(&irq_desc_lock_class);
[ 13.078601] lock(&irq_desc_lock_class);
[ 13.078607]
[ 13.078607] *** DEADLOCK ***
[ 13.078607]
[ 13.078609] May be due to missing lock nesting notation
[ 13.078609]
[ 13.078612] 6 locks held by kworker/u16:9/254:
[ 13.078616] #0:
[ 13.085399] platform regulatory.0: Direct firmware load for
regulatory.db failed with error -2
[ 13.091177] ffff09e780018d38
((wq_completion)events_unbound){+.+.}-{0:0}, at:
process_one_work+0x1e8/0x6e0
[ 13.091196] #1:
[ 13.093692] cfg80211: failed to load regulatory.db
[ 13.096138] ffff800008de3dd0 (deferred_probe_work){+.+.}-{0:0}, at:
process_one_work+0x1e8/0x6e0
[ 13.157611] #2: ffff09e7812e2988 (&dev->mutex){....}-{3:3}, at:
__device_attach+0x40/0x1d0
[ 13.166066] #3: ffffa9861bcd0b70 (cpu_hotplug_lock){++++}-{0:0},
at: cpus_read_lock+0x1c/0x2c
[ 13.174783] #4: ffff09e780f90918 (subsys mutex#8){+.+.}-{3:3}, at:
subsys_interface_register+0x64/0x150
[ 13.184374] #5: ffff09e785f4c0f8
(&irq_desc_lock_class){-.-.}-{2:2}, at: __irq_get_desc_lock+0x64/0xa4
[ 13.193869]
[ 13.193869] stack backtrace:
[ 13.198274] CPU: 3 PID: 254 Comm: kworker/u16:9 Not tainted 5.18.0-rc5 #1
[ 13.205137] Hardware name: Thundercomm Dragonboard 845c (DT)
[ 13.210856] Workqueue: events_unbound deferred_probe_work_func
[ 13.216759] Call trace:
[ 13.219238] dump_backtrace+0xc0/0x134
[ 13.223032] show_stack+0x24/0x7c
[ 13.226381] dump_stack_lvl+0x8c/0xb8
[ 13.230090] dump_stack+0x18/0x34
[ 13.233442] __lock_acquire+0xbc0/0x2180
[ 13.237406] lock_acquire.part.0+0xe0/0x230
[ 13.241639] lock_acquire+0x68/0x84
[ 13.245164] _raw_spin_lock_irqsave+0x88/0x170
[ 13.249659] __irq_get_desc_lock+0x64/0xa4
[ 13.253806] enable_irq+0x40/0xb0
[ 13.257158] lmh_enable_interrupt+0x38/0x44 [lmh]
[ 13.261924] irq_enable+0x4c/0xa0
[ 13.265277] __irq_startup+0x80/0xb0
[ 13.268896] irq_startup+0x84/0x174
[ 13.272432] __enable_irq+0x7c/0x90
[ 13.275967] enable_irq+0x54/0xb0
[ 13.279320] qcom_cpufreq_ready+0x2c/0x40
[ 13.283382] cpufreq_online+0x7dc/0xa50
[ 13.287263] cpufreq_add_dev+0xd4/0xf0
[ 13.291053] subsys_interface_register+0x138/0x150
[ 13.295899] cpufreq_register_driver+0x180/0x300
[ 13.300572] qcom_cpufreq_hw_driver_probe+0xe0/0x150
[ 13.305588] platform_probe+0x74/0x100
[ 13.309378] really_probe+0x18c/0x3e0
[ 13.313086] __driver_probe_device+0x124/0x1a0
[ 13.317577] driver_probe_device+0x44/0x110
[ 13.321809] __device_attach_driver+0xb0/0x154
[ 13.326302] bus_for_each_drv+0x84/0xe0
[ 13.330178] __device_attach+0xe0/0x1d0
[ 13.334056] device_initial_probe+0x20/0x30
[ 13.338288] bus_probe_device+0xac/0xb4
[ 13.342166] deferred_probe_work_func+0xc8/0x120
[ 13.346840] process_one_work+0x280/0x6e0
[ 13.350892] worker_thread+0x80/0x434
[ 13.354597] kthread+0x10c/0x120
[ 13.357863] ret_from_fork+0x10/0x20
[ 13.415473] xhci_hcd 0000:01:00.0: Adding to iommu group 6
[ 13.423508] cpu cpu4: EM: created perf domain


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

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

[1] https://lkft.validation.linaro.org/scheduler/job/4975803#L3721
[2] https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v5.18-rc5/testrun/9321027/suite/linux-log-parser/test/check-kernel-warning-4975803/log

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