linux-kernel - Re: [GIT PULL] x86/asm changes for v5.6

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Date:   Thu, 30 Jan 2020 13:59:59 +0200
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     Borislav Petkov <bp@...e.de>
Cc:     Damian Tometzki <damian.tometzki@...ilie-tometzki.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Luck, Tony" <tony.luck@...el.com>, Ingo Molnar <mingo@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] x86/asm changes for v5.6

On Thu, Jan 30, 2020 at 12:53:26PM +0100, Borislav Petkov wrote:
> On Thu, Jan 30, 2020 at 01:10:57PM +0200, Mike Rapoport wrote:
> > It seems that this a random boot crash caused by 987f028b8637cfa7 ("char:
> > hpet: Use flexible-array member") and fix is on the way:
> > 
> > https://lore.kernel.org/lkml/202001300450.00U4ocvS083098@www262.sakura.ne.jp/
> 
> Hmm, I don't see the connection at a first glance except that both stack
> traces lead somewhere down the bowels of k*alloc...

I've seen similar crash with my qemu/kvm and bisected it to that commit.

The hpet allocation is off-by-one and as a result hpet corrupts the memory
somewhere in the slab
 
> -- 
> Regards/Gruss,
>     Boris.
> 
> SUSE Software Solutions Germany GmbH, GF: Felix Imendörffer, HRB 36809, AG Nürnberg

-- 
Sincerely yours,
Mike.