Attachment 121490 Details for Bug 93294 – SKL CPU lockdep splat traces

SKL CPU lockdep splat traces

skl-cpu-lockdep-splat-trace.txt (text/plain), 1.85 KB, created by Joonas Lahtinen on 2016-02-03 14:17:14 UTC

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Creator: Joonas Lahtinen

Created: 2016-02-03 14:17:14 UTC

Size: 1.85 KB

patch

obsolete

>intel_pstate_init(...)
>	...cpufreq_online(...)
>		down_write(&policy->rwsem);
>		...
>		cpufreq_init_policy(policy);
>			...intel_pstate_hwp_set();
>				get_online_cpus(); // Temporarily locks cpu_hotplug.lock
>		...
>		up_write(&policy->rwsem);
>
>pm_suspend(...)
>	...disable_nonboot_cpus()
>		_cpu_down()
>			cpu_hotplug_begin(); // Locks cpu_hotplug.lock
>			__cpu_notify(CPU_DOWN_PREPARE, ...);
>				...cpufreq_offline_prepare();
>					down_write(&policy->rwsem); // Locks policy->rwsem
>
>FULL TRACE FOR P-STATE INIT
>
>get_online_cpus+0x90/0xa0
>? get_online_cpus+0x2d/0xa0
>intel_pstate_hwp_set+0x40/0x150
>intel_pstate_set_policy+0x135/0x170
>cpufreq_set_policy+0xdb/0x3f0
>cpufreq_init_policy+0x6a/0xc0
>? cpufreq_update_policy+0x1e0/0x1e0
>cpufreq_online+0x314/0xad0
>cpufreq_add_dev+0x5a/0x80
>subsys_interface_register+0xa7/0xf0
>? _raw_write_unlock_irqrestore+0x3d/0x60
>cpufreq_register_driver+0x147/0x210
>intel_pstate_init+0x35b/0x481
>? cpufreq_gov_dbs_init+0x12/0x12
>do_one_initcall+0xa6/0x1d0
>kernel_init_freeable+0x113/0x199
>? rest_init+0x140/0x140
>kernel_init+0x9/0xe0
>ret_from_fork+0x3f/0x70
>? rest_init+0x140/0x140
>
>FULL TRACE FOR SUSPEND
>
>lock_acquire+0xc3/0x1d0
>? cpufreq_offline_prepare+0x92/0x2d0
>down_write+0x3f/0x70
>? cpufreq_offline_prepare+0x92/0x2d0
>cpufreq_offline_prepare+0x92/0x2d0
>cpufreq_cpu_callback+0x45/0x50
>notifier_call_chain+0x39/0xa0
>__raw_notifier_call_chain+0x9/0x10
>_cpu_down+0x9e/0x330
>? vprintk_emit+0x2cb/0x610
>? vprintk_emit+0x324/0x610
>? vprintk_default+0x1a/0x20
>disable_nonboot_cpus+0xc0/0x350
>suspend_devices_and_enter+0x409/0xb30
>pm_suspend+0x53f/0x8c0
>state_store+0x77/0xe0
>kobj_attr_store+0xf/0x20
>sysfs_kf_write+0x40/0x50
>kernfs_fop_write+0x13c/0x180
>__vfs_write+0x23/0xe0
>? percpu_down_read+0x52/0x90
>? __sb_start_write+0xb2/0xf0
>? __sb_start_write+0xb2/0xf0
>vfs_write+0xa2/0x190
>? __fget_light+0x6a/0x90
>SyS_write+0x44/0xb0
>entry_SYSCALL_64_fastpath+0x16/0x73
>
># EOF

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Attachments on bug 93294: 121490

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