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? [...] > [ 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. > [ 0.000000] flags: 0x80000000() > [ 0.000000] raw: 80000000 00000000 00000000 ffffff80 00000000 00000100 00000200 00000001 > [ 0.000000] page dumped because: nonzero mapcount > [ 0.000000] Modules linked in: > [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.17.0-rc5-elk+ #145 > [ 0.000000] Hardware name: Dell Inc. Latitude E5410/03VXMC, BIOS A15 07/11/2013 > [ 0.000000] Call Trace: > [ 0.000000] dump_stack+0x60/0x96 > [ 0.000000] bad_page+0x9a/0x100 > [ 0.000000] free_pages_check_bad+0x3f/0x60 > [ 0.000000] free_pcppages_bulk+0x29d/0x5b0 > [ 0.000000] free_unref_page_commit+0x84/0xb0 > [ 0.000000] free_unref_page+0x3e/0x70 > [ 0.000000] __free_pages+0x1d/0x20 > [ 0.000000] free_highmem_page+0x19/0x40 > [ 0.000000] add_highpages_with_active_regions+0xab/0xeb > [ 0.000000] set_highmem_pages_init+0x66/0x73 > [ 0.000000] mem_init+0x1b/0x1d7 > [ 0.000000] start_kernel+0x17a/0x363 > [ 0.000000] i386_start_kernel+0x95/0x99 > [ 0.000000] startup_32_smp+0x164/0x168 -- Michal Hocko SUSE Labs
