linux-kernel - Re: [BISECTED] Boot hangs when SLUB_DEBUG

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Date:   Thu, 23 Nov 2023 00:13:00 +0100
From:   Andrey Konovalov <andreyknvl@...il.com>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>
Cc:     andrey.konovalov@...ux.dev,
        Andrew Morton <akpm@...ux-foundation.org>,
        Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Oscar Salvador <osalvador@...e.de>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [BISECTED] Boot hangs when SLUB_DEBUG_ON=y

On Wed, Nov 22, 2023 at 4:17 AM Hyeonggon Yoo <42.hyeyoo@...il.com> wrote:
>
> On Tue, Nov 21, 2023 at 1:08 PM <andrey.konovalov@...ux.dev> wrote:
> >
> > From: Andrey Konovalov <andreyknvl@...gle.com>
> >
> > Evict alloc/free stack traces from the stack depot for Generic KASAN
> > once they are evicted from the quaratine.
> >
> > For auxiliary stack traces, evict the oldest stack trace once a new one
> > is saved (KASAN only keeps references to the last two).
> >
> > Also evict all saved stack traces on krealloc.
> >
> > To avoid double-evicting and mis-evicting stack traces (in case KASAN's
> > metadata was corrupted), reset KASAN's per-object metadata that stores
> > stack depot handles when the object is initialized and when it's evicted
> > from the quarantine.
> >
> > Note that stack_depot_put is no-op if the handle is 0.
> >
> > Reviewed-by: Marco Elver <elver@...gle.com>
> > Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
>
> I observed boot hangs on a few SLUB configurations.
>
> Having other users of stackdepot might be the cause. After passing
> 'slub_debug=-' which disables SLUB debugging, it boots fine.

Hi Hyeonggon,

Just mailed a fix.

Thank you for the report!