linux-kernel - Re: [4.14.66-rt40] [report][cpuhotplug] BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:974

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Date:   Wed, 29 Aug 2018 21:57:01 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>,
        Mike Galbraith <efault@....de>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [4.14.66-rt40] [report][cpuhotplug] BUG: sleeping function
 called from invalid context at kernel/locking/rtmutex.c:974

On Wed, 29 Aug 2018 16:28:50 -0500
Grygorii Strashko <grygorii.strashko@...com> wrote:

> On 08/29/2018 09:08 AM, Sebastian Andrzej Siewior wrote:
> > On 2018-08-28 18:28:42 [-0500], Grygorii Strashko wrote:  
> 
> [...]
> 
> >> [    0.912275] [<ffff0000082023cc>] alloc_pages_current+0xcc/0xe0
> >> [    0.912287] [<ffff00000846bb00>] its_allocate_pending_table+0x60/0xa0
> >> [    0.912295] [<ffff00000846e5d8>] its_cpu_init+0x2a0/0x380
> >> [    0.912303] [<ffff00000846b484>] gic_cpu_init.part.6+0x15c/0x170
> >> [    0.912311] [<ffff00000846b4ac>] gic_starting_cpu+0x14/0x20  
> > 
> > This is fixed by
> >    https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/tree/patches/irqchip-gic-v3-its-Make-its_lock-a-raw_spin_lock_t.patch?h=linux-4.18.y-rt-patches  
> [1]
> >    https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/tree/patches/irqchip-gic-v3-its-Move-ITS-pend_page-allocation-int.patch?h=linux-4.18.y-rt-patches  
> [2]
> > 
> > in the v4.18 tree. The first patch was merged upstream. The second will
> > be replaced by the patches Marc Zyngier proposed in
> >    https://lkml.kernel.org/r/3302f069-8f4e-8d97-5166-0dec01b43c4c@arm.com
> > 
> > I plan to test + replace those for the next v4.18 release.  
> 
> Thank you. Are there any plans to back port them for 4.14-rt?
> Patch [1] need to be reworked a bit, [2] - I was able to cherry-pick from 4.18-rt.
> 

Next week I plan on looking into the patches that need to be
backported. There's quite a lot of them.

-- Steve