linux-ext4 - Re: [Bug 203107] New: Bad page map in process during boot

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Date:   Thu, 4 Apr 2019 16:08:39 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Jan Kara <jack@...e.cz>
Cc:     bugzilla-daemon@...zilla.kernel.org, linux-ext4@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [Bug 203107] New: Bad page map in process during boot

On Tue, Apr 02, 2019 at 12:16:13PM +0200, Jan Kara wrote:
> Switching to email...
> 
> On Fri 29-03-19 20:46:22, bugzilla-daemon@...zilla.kernel.org wrote:
> > https://bugzilla.kernel.org/show_bug.cgi?id=203107
> > 
> >             Bug ID: 203107
> >            Summary: Bad page map in process during boot
> >            Product: File System
> >            Version: 2.5
> >     Kernel Version: 5.0.5
> >           Hardware: All
> >                 OS: Linux
> >               Tree: Mainline
> >             Status: NEW
> >           Severity: normal
> >           Priority: P1
> >          Component: ext4
> >           Assignee: fs_ext4@...nel-bugs.osdl.org
> >           Reporter: echto1@...il.com
> >         Regression: No
> > 
> > Error occurs randomly at boot after upgrading kernel from 5.0.0 to 5.0.4.
> > 
> > https://justpaste.it/387uf
> 
> I don't think this is an ext4 error. Sure this is an error in file mapping
> of libblkid.so.1.1.0 (which is handled by ext4) but the filesystem has very
> little to say wrt how or which PTEs are installed. And the problem is that
> invalid PTE (dead000000000100) is present in page tables. So this looks
> more like a problem in MM itself. Adding MM guys to CC.

0xdead000000000100 and 0xdead000000000200 are LIST_POISON1 and
LIST_POISON2 repectively. Have no idea how would they end up in page table.

-- 
 Kirill A. Shutemov