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Date: Tue, 28 Apr 2015 14:04:56 +0100 From: Sudeep Holla <sudeep.holla@....com> To: "Rafael J. Wysocki" <rafael@...nel.org> CC: Sudeep Holla <sudeep.holla@....com>, Daniel Lezcano <daniel.lezcano@...aro.org>, Linus Walleij <linus.walleij@...aro.org>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Linux PM list <linux-pm@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, ACPI Devel Maling List <linux-acpi@...r.kernel.org> Subject: Re: [PATCH 16/20] sched/idle: Use explicit broadcast oneshot control function Hi Rafael, On 28/04/15 13:19, Rafael J. Wysocki wrote: > On Tue, Apr 28, 2015 at 12:42 PM, Sudeep Holla <sudeep.holla@....com> wrote: [...] >> >> At-least I observed issue only when I am using hardware broadcast timer. >> It doesn't hang when I am using hrtimer as broadcast timer in which case >> one of the cpu will be not enter deeper idle states that lose timer. >> I will rerun on v4.1-rc1 and post the complete log. > > So the bug here is that cpuidle_enter() enables interrupts, so the > assumption about them being not enabled made by > tick_broadcast_oneshot_control() is actually not valid. > > It looks like we need to acquire the clockevents_lock at least in this > particular case. Let me see where to put it and I'll send a patch for > testing. > Thanks for looking at this, I can also help in testing. Sending the complete log again with v4.1-rc1 if it's any useful. Regards, Sudeep --->8 BUG: spinlock lockup suspected on CPU#0, swapper/0/0 lock: tick_broadcast_lock+0x0/0x40, .magic: dead4ead, .owner: swapper/0/0, .owner_cpu: 0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.1.0-rc1 #16 Hardware name: ARM-Versatile Express [<c0014b1d>] (unwind_backtrace) from [<c0011659>] (show_stack+0x11/0x14) [<c0011659>] (show_stack) from [<c05192ed>] (dump_stack+0x6d/0x78) [<c05192ed>] (dump_stack) from [<c005c897>] (do_raw_spin_lock+0xc3/0x144) [<c005c897>] (do_raw_spin_lock) from [<c00811f9>] (tick_handle_oneshot_broadcast+0x25/0x164) [<c00811f9>] (tick_handle_oneshot_broadcast) from [<c001dd21>] (sp804_timer_interrupt+0x31/0x34) [<c001dd21>] (sp804_timer_interrupt) from [<c0067ee1>] (handle_irq_event_percpu+0x45/0x154) [<c0067ee1>] (handle_irq_event_percpu) from [<c006801f>] (handle_irq_event+0x2f/0x44) [<c006801f>] (handle_irq_event) from [<c0069edb>] (handle_fasteoi_irq+0x6f/0xf0) [<c0069edb>] (handle_fasteoi_irq) from [<c00677c7>] (generic_handle_irq+0x23/0x2c) [<c00677c7>] (generic_handle_irq) from [<c0067a0d>] (__handle_domain_irq+0x45/0x84) [<c0067a0d>] (__handle_domain_irq) from [<c0009303>] (gic_handle_irq+0x27/0x50) [<c0009303>] (gic_handle_irq) from [<c0011eff>] (__irq_svc+0x3f/0x64) Exception stack(0xc07ebf08 to 0xc07ebf50) bf00: 00000000 c1038814 00000001 00000001 c07f3f80 ee78dec0 bf20: 00000000 c1038810 00000000 00000001 c07ebf88 c0520fc8 00000000 c07ebf50 bf40: c008151d c02e104e 40000173 ffffffff [<c0011eff>] (__irq_svc) from [<c02e104e>] (_test_and_clear_bit+0x26/0x48) [<c02e104e>] (_test_and_clear_bit) from [<c008151d>] (tick_broadcast_oneshot_control+0x159/0x1ec) [<c008151d>] (tick_broadcast_oneshot_control) from [<c0050273>] (cpu_startup_entry+0x2c3/0x2f8) [<c0050273>] (cpu_startup_entry) from [<c0782a47>] (start_kernel+0x327/0x330) BUG: spinlock lockup suspected on CPU#3, swapper/3/0 BUG: spinlock lockup suspected on CPU#4, swapper/4/0 lock: tick_broadcast_lock+0x0/0x40, .magic: dead4ead, .owner: swapper/0/0, .owner_cpu: 0 CPU: 4 PID: 0 Comm: swapper/4 Not tainted 4.1.0-rc1 #16 Hardware name: ARM-Versatile Express [<c0014b1d>] (unwind_backtrace) from [<c0011659>] (show_stack+0x11/0x14) [<c0011659>] (show_stack) from [<c05192ed>] (dump_stack+0x6d/0x78) BUG: spinlock lockup suspected on CPU#2, swapper/2/0 [<c05192ed>] (dump_stack) from [<c005c897>] (do_raw_spin_lock+0xc3/0x144) lock: tick_broadcast_lock+0x0/0x40, .magic: dead4ead, .owner: swapper/0/0, .owner_cpu: 0 [<c005c897>] (do_raw_spin_lock) from [<c0081409>] (tick_broadcast_oneshot_control+0x45/0x1ec) [<c0081409>] (tick_broadcast_oneshot_control) from [<c0050273>] (cpu_startup_entry+0x2c3/0x2f8) [<c0050273>] (cpu_startup_entry) from [<800093d1>] (0x800093d1) CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.1.0-rc1 #16 Hardware name: ARM-Versatile Express [<c0014b1d>] (unwind_backtrace) from [<c0011659>] (show_stack+0x11/0x14) [<c0011659>] (show_stack) from [<c05192ed>] (dump_stack+0x6d/0x78) [<c05192ed>] (dump_stack) from [<c005c897>] (do_raw_spin_lock+0xc3/0x144) [<c005c897>] (do_raw_spin_lock) from [<c0081409>] (tick_broadcast_oneshot_control+0x45/0x1ec) [<c0081409>] (tick_broadcast_oneshot_control) from [<c0050273>] (cpu_startup_entry+0x2c3/0x2f8) [<c0050273>] (cpu_startup_entry) from [<800093d1>] (0x800093d1) lock: tick_broadcast_lock+0x0/0x40, .magic: dead4ead, .owner: swapper/0/0, .owner_cpu: 0 CPU: 3 PID: 0 Comm: swapper/3 Not tainted 4.1.0-rc1 #16 Hardware name: ARM-Versatile Express [<c0014b1d>] (unwind_backtrace) from [<c0011659>] (show_stack+0x11/0x14) [<c0011659>] (show_stack) from [<c05192ed>] (dump_stack+0x6d/0x78) [<c05192ed>] (dump_stack) from [<c005c897>] (do_raw_spin_lock+0xc3/0x144) [<c005c897>] (do_raw_spin_lock) from [<c0081409>] (tick_broadcast_oneshot_control+0x45/0x1ec) [<c0081409>] (tick_broadcast_oneshot_control) from [<c0050273>] (cpu_startup_entry+0x2c3/0x2f8) [<c0050273>] (cpu_startup_entry) from [<800093d1>] (0x800093d1) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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