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Date:	Mon, 6 Oct 2014 15:34:31 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Will Deacon <Will.Deacon@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: Perf lockups / stack overflows on v3.17-rc6, x86_64, arm, arm64

> > > Log 2, x86_64 stack overflow
> > 
> > > [  346.641345] divide error: 0000 [#1] SMP
> > > [  346.642010] Modules linked in:
> > > [  346.642010] CPU: 0 PID: 4076 Comm: perf_fuzzer Not tainted 3.17.0-rc6hark-perf-lockup+ #1
> > > [  346.642010] Hardware name: LENOVO 7484A3G/LENOVO, BIOS 5CKT54AUS 09/07/2009
> > > [  346.642010] task: ffff8801ac449a70 ti: ffff8801ac574000 task.ti: ffff8801ac574000
> > > [  346.642010] RIP: 0010:[<ffffffff81078bce>]  [<ffffffff81078bce>] find_busiest_group+0x28e/0x8a0
> > > [  346.642010] RSP: 0018:ffff8801ac577760  EFLAGS: 00010006
> > > [  346.642010] RAX: 00000000000003ff RBX: 0000000000000000 RCX: 00000000ffff8801
> > > [  346.642010] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
> > > [  346.642010] RBP: ffff8801ac577890 R08: 0000000000000000 R09: 0000000000000000
> > > [  346.704010] ------------[ cut here ]------------
> > > [  346.704017] WARNING: CPU: 2 PID: 5 at arch/x86/kernel/irq_64.c:70 handle_irq+0x141/0x150()
> > > [  346.704019] do_IRQ():  has overflown the kernel stack (cur:1,sp:ffff8801b653fe88,irq stk top-bottom:ffff8801bed00080-ffff8801bed03fc0,exception stk top-bottom:ffff8801bed04080-ffff8801bed0a000)
> > 
> > weird, have not seen this before.  Though I was hitting a reboot issue
> > that would give really strange crash messages that was possibly fixed by
> > a patch that went into 3.17-rc7.
> 
> Interesting. I'll retry with v3.17.

So far I haven't been able to trigger the above failure on v3.17, so perhaps
some patch has fixed that.

With the same seed (1411654897) I can trigger a hw_breakpoint warning
relatively repeatably (logs for a couple of instances below).

Mark.

---->8----
[ 3268.694056] ------------[ cut here ]------------
[ 3268.694066] WARNING: CPU: 0 PID: 19671 at arch/x86/kernel/hw_breakpoint.c:119 arch_install_hw_breakpoint+0xf0/0x100()
[ 3268.694068] Can't find any breakpoint slot
[ 3268.694070] Modules linked in:
[ 3268.694075] CPU: 0 PID: 19671 Comm: perf_fuzzer Not tainted 3.17.0hark-lockup2-2014-10-06 #4
[ 3268.694077] Hardware name: LENOVO 7484A3G/LENOVO, BIOS 5CKT54AUS 09/07/2009
[ 3268.694079]  0000000000000009 ffff88019a343c78 ffffffff8182da5c ffff88019a343cc0
[ 3268.694084]  ffff88019a343cb0 ffffffff8104af38 ffff8801af5ec800 ffff8801a0faae00
[ 3268.694088]  ffff8801bec16780 ffff8801bec16784 000001b8c35e3e18 ffff88019a343d10
[ 3268.694092] Call Trace:
[ 3268.694098]  [<ffffffff8182da5c>] dump_stack+0x45/0x56
[ 3268.694103]  [<ffffffff8104af38>] warn_slowpath_common+0x78/0xa0
[ 3268.694106]  [<ffffffff8104afa7>] warn_slowpath_fmt+0x47/0x50
[ 3268.694110]  [<ffffffff8100a720>] arch_install_hw_breakpoint+0xf0/0x100
[ 3268.694114]  [<ffffffff8111101f>] hw_breakpoint_add+0x3f/0x50
[ 3268.694117]  [<ffffffff8110b3d4>] event_sched_in.isra.80+0x84/0x1b0
[ 3268.694121]  [<ffffffff8110b569>] group_sched_in+0x69/0x1e0
[ 3268.694124]  [<ffffffff8110c5cb>] ? perf_event_update_userpage+0xeb/0x160
[ 3268.694129]  [<ffffffff8107568d>] ? sched_clock_local+0x1d/0x80
[ 3268.694132]  [<ffffffff8110b7b2>] ctx_sched_in.isra.81+0xd2/0x1a0
[ 3268.694136]  [<ffffffff8110b8cf>] perf_event_sched_in.isra.84+0x4f/0x70
[ 3268.694139]  [<ffffffff8110bac3>] perf_event_context_sched_in.isra.85+0x73/0xc0
[ 3268.694142]  [<ffffffff8110c175>] __perf_event_task_sched_in+0x185/0x1a0
[ 3268.694147]  [<ffffffff8106c832>] finish_task_switch+0xb2/0xf0
[ 3268.694151]  [<ffffffff818339bf>] __schedule+0x34f/0x810
[ 3268.694154]  [<ffffffff81833ea4>] schedule+0x24/0x70
[ 3268.694158]  [<ffffffff818395d1>] int_careful+0xd/0x14
[ 3268.694160] ---[ end trace e1f62407a7d7e846 ]---
---->8----

---->8----
[ 4016.924076] ------------[ cut here ]------------
[ 4016.925039] WARNING: CPU: 1 PID: 14091 at arch/x86/kernel/hw_breakpoint.c:119 arch_install_hw_breakpoint+0xf0/0x100()
[ 4016.925039] Can't find any breakpoint slot
[ 4016.925039] Modules linked in:
[ 4016.925039] CPU: 1 PID: 14091 Comm: perf_fuzzer Not tainted 3.17.0hark-lockup2-2014-10-06 #4
[ 4016.925039] Hardware name: LENOVO 7484A3G/LENOVO, BIOS 5CKT54AUS 09/07/2009
[ 4016.925039]  0000000000000009 ffff8800cd85f9a8 ffffffff8182da5c ffff8800cd85f9f0
[ 4016.925039]  ffff8800cd85f9e0 ffffffff8104af38 ffff8800e38bd000 ffff8801a6fb1c00
[ 4016.925039]  ffff8801bec96780 ffff8801bec96784 0000027400d480df ffff8800cd85fa40
[ 4016.925039] Call Trace:
[ 4016.925039]  [<ffffffff8182da5c>] dump_stack+0x45/0x56
[ 4016.925039]  [<ffffffff8104af38>] warn_slowpath_common+0x78/0xa0
[ 4016.925039]  [<ffffffff8104afa7>] warn_slowpath_fmt+0x47/0x50
[ 4016.925039]  [<ffffffff8100a720>] arch_install_hw_breakpoint+0xf0/0x100
[ 4016.925039]  [<ffffffff8111101f>] hw_breakpoint_add+0x3f/0x50
[ 4016.925039]  [<ffffffff8110b3d4>] event_sched_in.isra.80+0x84/0x1b0
[ 4016.925039]  [<ffffffff8110b569>] group_sched_in+0x69/0x1e0
[ 4016.925039]  [<ffffffff8110c5cb>] ? perf_event_update_userpage+0xeb/0x160
[ 4016.925039]  [<ffffffff8107568d>] ? sched_clock_local+0x1d/0x80
[ 4016.925039]  [<ffffffff8110b7b2>] ctx_sched_in.isra.81+0xd2/0x1a0
[ 4016.925039]  [<ffffffff8110b8cf>] perf_event_sched_in.isra.84+0x4f/0x70
[ 4016.925039]  [<ffffffff8110bac3>] perf_event_context_sched_in.isra.85+0x73/0xc0
[ 4016.925039]  [<ffffffff8110c175>] __perf_event_task_sched_in+0x185/0x1a0
[ 4016.925039]  [<ffffffff8106c832>] finish_task_switch+0xb2/0xf0
[ 4016.925039]  [<ffffffff818339bf>] __schedule+0x34f/0x810
[ 4016.925039]  [<ffffffff81833ea4>] schedule+0x24/0x70
[ 4016.925039]  [<ffffffff81837ca9>] schedule_timeout+0x1b9/0x290
[ 4016.925039]  [<ffffffff81835113>] ? wait_for_completion+0x23/0x100
[ 4016.925039]  [<ffffffff8183518c>] wait_for_completion+0x9c/0x100
[ 4016.925039]  [<ffffffff81072800>] ? wake_up_state+0x10/0x10
[ 4016.925039]  [<ffffffff8109e7f0>] ? call_rcu_bh+0x20/0x20
[ 4016.925039]  [<ffffffff8109c766>] wait_rcu_gp+0x46/0x50
[ 4016.925039]  [<ffffffff8109c710>] ? ftrace_raw_output_rcu_utilization+0x50/0x50
[ 4016.925039]  [<ffffffff8109ee93>] synchronize_sched+0x33/0x50
[ 4016.925039]  [<ffffffff810f9fab>] perf_trace_event_unreg.isra.1+0x3b/0x90
[ 4016.925039]  [<ffffffff810fa318>] perf_trace_destroy+0x38/0x50
[ 4016.925039]  [<ffffffff81106d99>] tp_perf_event_destroy+0x9/0x10
[ 4016.925039]  [<ffffffff81108523>] __free_event+0x23/0x70
[ 4016.925039]  [<ffffffff8110f057>] SYSC_perf_event_open+0x397/0xa50
[ 4016.925039]  [<ffffffff8110fad9>] SyS_perf_event_open+0x9/0x10
[ 4016.925039]  [<ffffffff81839550>] tracesys+0xdd/0xe2
[ 4016.925039] ---[ end trace a2fe478e9cb5649b ]---
---->8----
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