Comment 12 for bug 1711358

Unfortunately I don't seem to have access to the latest images and this happening only when booting the ISO makes it hard(er) to grab data. I did finally succeed by using "virsh dump --memory-only <domain> <file>" and then "sudo strings <file>|less". And it looks like the qxl drm driver is crashing. I put the data here for reference but if you could do the same with an iso containing the 4.13 kernel, that would be great.

kernel BUG at /build/linux-cK2WUa/linux-4.12.0/drivers/gpu/drm/ttm/ttm_bo_util.
c:589!
invalid opcode: 0000 [#1] SMP
Modules linked in: overlay nls_utf8 isofs dm_mirror dm_region_hash dm_log qxl tt
m drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm psmouse virti
o_blk virtio_net pata_acpi floppy
CPU: 0 PID: 264 Comm: plymouthd Not tainted 4.12.0-13-generic #14-Ubuntu
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu
1 04/01/2014
task: ffff8e62faee5500 task.stack: ffffa5bc40614000
RIP: 0010:ttm_bo_kmap+0x1b5/0x260 [ttm]
RSP: 0018:ffffa5bc40617bb8 EFLAGS: 00010283
RAX: ffff8e62fa364e90 RBX: ffff8e62fa333c00 RCX: ffff8e62fa333e90
RDX: 0000000000000300 RSI: 0000000000000000 RDI: ffff8e62fa333c58
RBP: ffffa5bc40617bf8 R08: ffff8e62fa333d28 R09: 0000000000000400
R10: 0000000000000008 R11: 000000000000157d R12: ffff8e62fa39e6b0
R13: 0000000000000000 R14: ffff8e62fa2f3cf8 R15: 0000000000000000
FS: 00007f2a9f914b80(0000) GS:ffff8e62fde00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056218cba50eb CR3: 000000007a276000 CR4: 00000000000006f0
Call Trace:
 ? qxl_bo_kunmap_atomic_page+0x85/0x90 [qxl]
 qxl_bo_kmap+0x42/0x70 [qxl]F(9m
 qxl_draw_dirty_fb+0x1f5/0x420 [qxl]>19m
 qxl_framebuffer_surface_dirty+0xa0/0xf0 [qxl]
 ? __kmalloc+0x1bb/0x1f0
 drm_mode_dirtyfb_ioctl+0x17e/0x1c0 [drm]
 drm_ioctl+0x213/0x4d0 [drm]
 ? drm_mode_getfb+0x110/0x110 [drm]
 ? __hrtimer_init+0xb0/0xb0
 do_vfs_ioctl+0xa5/0x610
 ? wake_up_q+0x80/0x80
 SyS_ioctl+0x79/0x90i
 entry_SYSCALL_64_fastpath+0x1e/0xa9
RIP: 0033:0x7f2a9f0024d7
RSP: 002b:00007ffd3c26bf98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffd3c34c080 RCX: 00007f2a9f0024d7
RDX: 00007ffd3c26bfd0 RSI: 00000000c01864b1 RDI: 0000000000000009
RBP: 00007ffd3c26bff0 R08: ffffffffffffff98 R09: 00007ffd3c26bf70
R10: 000000000000000a R11: 0000000000000246 R12: 0000000000000b64
R13: 00007ffd3c26c00c R14: 0000000000000000 R15: 00007f2a9f6f72d0