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Date:   Thu, 21 Dec 2017 16:01:30 +0100
From:   Daniel Wagner <wagi@...om.org>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [v4.14-rt][report] arm: run: stress-ng --class os --all 0 -t 5m

Hi Grygorii,

On 12/20/2017 01:33 AM, Grygorii Strashko wrote:

> I've run test few times - can't see "WARNING: possible circular locking dependency detected"
> any more. Below warning happened once.
> 
> [ 3091.593894] ------------[ cut here ]------------
> [ 3091.593909] WARNING: CPU: 0 PID: 1797 at kernel/rcu/tree_plugin.h:310 rcu_note_context_switch+0x554/0x950
> [ 3091.593912] Modules linked in:
> [ 3091.593923] CPU: 0 PID: 1797 Comm: stress-ng-clock Not tainted 4.14.6-rt7-dirty #37
> [ 3091.593926] Hardware name: Generic DRA74X (Flattened Device Tree)
> [ 3091.593941] [<c0110090>] (unwind_backtrace) from [<c010c710>] (show_stack+0x10/0x14)
> [ 3091.593952] [<c010c710>] (show_stack) from [<c08388b8>] (dump_stack+0xa0/0xd4)
> [ 3091.593964] [<c08388b8>] (dump_stack) from [<c013668c>] (__warn+0xd8/0x104)
> [ 3091.593975] [<c013668c>] (__warn) from [<c0136764>] (warn_slowpath_null+0x20/0x28)
> [ 3091.593984] [<c0136764>] (warn_slowpath_null) from [<c01b8efc>] (rcu_note_context_switch+0x554/0x950)
> [ 3091.593996] [<c01b8efc>] (rcu_note_context_switch) from [<c084e08c>] (__schedule+0xc4/0xa7c)
> [ 3091.594005] [<c084e08c>] (__schedule) from [<c084eaa4>] (schedule+0x60/0xf8)
> [ 3091.594016] [<c084eaa4>] (schedule) from [<c08505b4>] (rt_spin_lock_slowlock_locked+0xa8/0x304)
> [ 3091.594026] [<c08505b4>] (rt_spin_lock_slowlock_locked) from [<c0851060>] (__read_rt_lock+0xc0/0xf4)
> [ 3091.594036] [<c0851060>] (__read_rt_lock) from [<c01398cc>] (pin_current_cpu+0x3c/0x11c)
> [ 3091.594047] [<c01398cc>] (pin_current_cpu) from [<c0167ce0>] (migrate_disable+0x78/0x1e8)
> [ 3091.594057] [<c0167ce0>] (migrate_disable) from [<c085248c>] (rt_spin_lock+0x14/0x4c)
> [ 3091.594066] [<c085248c>] (rt_spin_lock) from [<c01cb150>] (__lock_timer+0xc0/0x220)
> [ 3091.594076] [<c01cb150>] (__lock_timer) from [<c01cc2b8>] (SyS_timer_gettime+0x14/0xb8)
> [ 3091.594087] [<c01cc2b8>] (SyS_timer_gettime) from [<c01079c8>] (__sys_trace_return+0x0/0x10)
> [ 3091.594091] ---[ end trace 0000000000000002 ]---

Known problem:

https://marc.info/?l=linux-rt-users&m=151206631210170&w=2

Thanks,
Daniel

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