Comment 6 for bug 1745608

That's weird:
[ 2691.471972] PANIC: double fault, error_code: 0x0
[ 2691.477488] Kernel panic - not syncing: Machine halted.
[ 2691.478724] CPU: 1 PID: 31425 Comm: cc1 Not tainted 4.4.0-98-generic #121-Ubuntu
[ 2691.479962] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-20171110_100015-anatol 04/01/2014
[ 2691.481621] 0000000000000086 dbc9cc8a876ccdc2 ffff88013fc84e80 ffffffff813fb2c3
[ 2691.483041] ffffffff81cb9bfd ffff88013fc84f18 ffff88013fc84f08 ffffffff8118df77
[ 2691.484325] 0000000000000008 ffff88013fc84f18 ffff88013fc84eb0 dbc9cc8a876ccdc2
[ 2691.485654] Call Trace:
[ 2691.486077] <#DF> [<ffffffff813fb2c3>] dump_stack+0x63/0x90
[ 2691.487057] [<ffffffff8118df77>] panic+0xd3/0x215
[ 2691.487880] [<ffffffff81060d5d>] df_debug+0x2d/0x30
[ 2691.488677] [<ffffffff8102fb8c>] do_double_fault+0x7c/0xf0
[ 2691.489620] [<ffffffff81846238>] double_fault+0x28/0x30
[ 2691.490537] [<ffffffff81407d07>] ? clear_page_c_e+0x7/0x10
[ 2691.491487] <<EOE>> [<ffffffff811987f4>] ? get_page_from_freelist+0x454/0xa50
[ 2691.492736] [<ffffffff8119f491>] ? pagevec_lookup_tag+0x21/0x30
[ 2691.493743] [<ffffffff8119b8e3>] ? write_cache_pages+0x123/0x510
[ 2691.494756] [<ffffffff81199b79>] __alloc_pages_nodemask+0x159/0x2a0
[ 2691.495826] [<ffffffff811e4fad>] alloc_pages_vma+0xad/0x250
[ 2691.496775] [<ffffffff811bf54f>] wp_page_copy.isra.56+0x38f/0x550
[ 2691.497802] [<ffffffff81199b79>] ? __alloc_pages_nodemask+0x159/0x2a0
[ 2691.498890] [<ffffffff811c0ea8>] do_wp_page+0xd8/0x6c0
[ 2691.499881] [<ffffffff810b5403>] ? update_curr+0xe3/0x160
[ 2691.501148] [<ffffffff811c2734>] handle_mm_fault+0xcf4/0x1820
[ 2691.502373] [<ffffffff810bab5c>] ? set_next_entity+0x9c/0xb0
[ 2691.503540] [<ffffffff8106b577>] __do_page_fault+0x197/0x400
[ 2691.504769] [<ffffffff8106b847>] trace_do_page_fault+0x37/0xe0
[ 2691.505859] [<ffffffff81063f29>] do_async_page_fault+0x19/0x70
[ 2691.507364] [<ffffffff81846868>] async_page_fault+0x28/0x30
[ 2691.508921] Kernel Offset: disabled
[ 2691.518757] ---[ end Kernel panic - not syncing: Machine halted.

Any ideas?