linux-kernel - Re: Linux 4.12-rc6

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Message-ID: <20170620025259.e7zxtsv4iltbuu6i@codemonkey.org.uk>
Date:   Mon, 19 Jun 2017 22:52:59 -0400
From:   Dave Jones <davej@...emonkey.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hugh Dickins <hughd@...gle.com>,
        Oleg Nesterov <oleg@...hat.com>, Michal Hocko <mhocko@...e.com>
Subject: Re: Linux 4.12-rc6

On Tue, Jun 20, 2017 at 10:32:00AM +0800, Linus Torvalds wrote:
 > On Tue, Jun 20, 2017 at 8:26 AM, Dave Jones <davej@...emonkey.org.uk> wrote:
 > >  > Hugh Dickins (1):
 > >  >       mm: larger stack guard gap, between vmas
 > >
 > > This seems to be buggered.
 > >
 > > 002331 00000396712307 0 2 kernel BUG at mm/mmap.c:1963!
 > > 002332 00000396712414 0 4 invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC
 > > 002333 00000396712541 0 4 CPU: 0 PID: 4572 Comm: trinity-c41 Not tainted 4.12.0-rc6-think+ #1
 > > 002336 00000396712959 0 4 RIP: 0010:unmapped_area_topdown+0xa5/0x170
 > 
 > Dave, do you have instructions for Hugh to recreate that with trinity
 > (or perhaps some way to generate a test-case from trinity?). Or does
 > it trigger easily by just running trinity?
 
trinity -c mmap hits it instantly for me. I'm using latest -git version,
but afair, even the older versions would hit this.

 > I'm in China right now, and will be traveling again this afternoon, so
 > I probably can't look at it myself until later, but hopefully Hugh has
 > the cycles to follow up in it..

I'll figure out the exact params in the morning if no-one has it figured
out overnight.

	Dave