linux-kernel - Re: [ANNOUNCE] v5.14-rc5-rt8

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Date:   Sun, 15 Aug 2021 05:13:11 +0200
From:   Mike Galbraith <efault@....de>
To:     Vlastimil Babka <vbabka@...e.cz>,
        Clark Williams <williams@...hat.com>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        RT <linux-rt-users@...r.kernel.org>
Subject: Re: [ANNOUNCE] v5.14-rc5-rt8

On Sat, 2021-08-14 at 21:08 +0200, Vlastimil Babka wrote:
> On 8/12/21 11:44 PM, Clark Williams wrote:
> >
> > $ ./scripts/faddr2line /data/o/linux-5.14.y-rt/vmlinux ___slab_alloc+0x340/0x940
> > ___slab_alloc+0x340/0x940:
> > PageSlabPfmemalloc at include/linux/page-flags.h:814
> > (inlined by) pfmemalloc_match at mm/slub.c:2772
> > (inlined by) ___slab_alloc at mm/slub.c:2874
>
> Aha! That's helpful. Hopefully it's just a small issue where we
> opportunistically test flags on a page that's protected by the local
> lock we didn't take yet, and I didn't realize there's the VM_BUG_ON
> which can trigger if our page went away (which we would have realized
> after taking the lock).
>
> So hopefully the below diff with uninspired naming should help?

I bet a nickle it does, shall let box slave away testing that theory
while its master pedals around the sunny Bavarian countryside.

	-Mike