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