From: "PaX Team" <pageexec@freemail.hu>
Subject: Re: PAX: size overflow detected in function ext4_llseek fs/ext4/file.c:670
Date: Sat, 13 May 2017 08:56:36 +0200
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Cc: linux-ext4@vger.kernel.org, Brad Spengler <spender@grsecurity.net>
To: "Theodore Ts'o" <tytso@mit.edu>, Emese Revfy <re.emese@gmail.com>,
        Shawn C <citypw@gmail.com>
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On 13 May 2017 at 12:23, Shawn C wrote:
> On 05/12/2017 05:58 PM, PaX Team wrote:
> > Shawn, can you do the printk instrumentation i suggested to print out
> > the value of offset (and isize too while at it)?
> >
> I inserted the printk info in fs/ext4/file.c:677
> 
> 00------------------
>         printk(KERN_DEBUG"offset: %lld, isize: %lld, blkbits: %d\n",
> offset, isize, blkbits);
> 11------------------
> 
> result:
> 
> offset: 105, isize: 19595264, blkbits: 12

are you sure this is the last message before the size overflow report?
can you perhaps post the relevant portion of dmesg too?