Re: [PATCH] Revert "mm/cma: manage the memory of the CMA area by using the ZONE_MOVABLE"

[Ville Syrjälä]

On Thu, May 17, 2018 at 08:13:35PM +0300, Ville Syrjälä wrote:
> On Thu, May 17, 2018 at 06:49:47PM +0200, Michal Hocko wrote:
> > On Thu 17-05-18 16:58:32, Ville Syrjälä wrote:
> > > On Thu, May 17, 2018 at 04:36:29PM +0300, Ville Syrjälä wrote:
> > > > On Thu, May 17, 2018 at 03:21:09PM +0200, Michal Hocko wrote:
> > > > > On Thu 17-05-18 15:59:59, Ville Syrjala wrote:
> > > > > > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > > > > > 
> > > > > > This reverts commit bad8c6c0b1144694ecb0bc5629ede9b8b578b86e.
> > > > > > 
> > > > > > Make x86 with HIGHMEM=y and CMA=y boot again.
> > > > > 
> > > > > Is there any bug report with some more details? It is much more
> > > > > preferable to fix the issue rather than to revert the whole thing
> > > > > right away.
> > > > 
> > > > The machine I have in front of me right now didn't give me anything.
> > > > Black screen, and netconsole was silent. No serial port on this
> > > > machine unfortunately.
> > > 
> > > Booted on another machine with serial:
> > 
> > Could you provide your .config please?
> 
> Attached. Not sure there's anything particularly useful in it though
> since I've now seen this on all the highmem systems I've booted.
> 
> 
> BTW I just noticed that the reported memory sizes look pretty crazy:
> 
> Memory: 3926480K/3987424K available (5254K kernel code, 561K rwdata,
> 2156K rodata, 572K init, 9308K bss, 56848K reserved,
> 4096K cma-reserved, 3078532K highmem)
> 
> vs.
> 
> Memory: 7001976K/3987424K available (5254K kernel code, 561K rwdata,
> 2156K rodata, 572K init, 9308K bss, 4291097664K reserved,
> 4096K cma-reserved, 7005012K highmem)
> 
> > 
> > [...]
> > > [    0.000000] cma: Reserved 4 MiB at 0x0000000037000000
> > [...]
> > > [    0.000000] BUG: Bad page state in process swapper  pfn:377fe
> > > [    0.000000] page:f53effc0 count:0 mapcount:-127 mapping:00000000 index:0x0
> > 
> > OK, so this looks the be the source of the problem. -128 would be a
> > buddy page but I do not see anything that would set the counter to -127
> > and the real map count updates shouldn't really happen that early.
> > 
> > Maybe CONFIG_DEBUG_VM and CONFIG_DEBUG_HIGHMEM will tell us more.
> 
> I'll see about grabbing another log.

With DEBUG_VM the machine doesn't get far enough to print anything on
the serial console.

DEBUG_HIGHMEM didn't give me any new output.

-- 
Ville Syrjälä
Intel