[Qemu-devel] [Bug 1769053] Re: Cannot start a guest with more than 1TB of RAM

[Dan Streetman]

BTW this is the stacktrace I get from a Xenial guest on Xenial host:

[    0.000000] BUG: unable to handle kernel paging request at ffffc90000000004
[    0.000000] IP: [<ffffffff81f7dc60>] hpet_enable.part.13+0x23/0x2a5
[    0.000000] PGD 171629ab067 PUD 171629ac067 PMD 171629ad067 PTE 
80000000fed00073
[    0.000000] Oops: 0009 [#1] SMP 
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.0-122-generic 
#146-Ubuntu
[    0.000000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
Ubuntu-1.8.2-1ubuntu1 04/01/2014
[    0.000000] task: ffffffff81e13500 ti: ffffffff81e00000 task.ti: 
ffffffff81e00000
[    0.000000] RIP: 0010:[<ffffffff81f7dc60>]  [<ffffffff81f7dc60>] 
hpet_enable.part.13+0x23/0x2a5
[    0.000000] RSP: 0000:ffffffff81e03ef0  EFLAGS: 00010282
[    0.000000] RAX: ffffc90000000000 RBX: ffffffffffffffff RCX: 0000000000000000
[    0.000000] RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000
[    0.000000] RBP: ffffffff81e03f10 R08: 000000000001ad50 R09: 00000000000001f0
[    0.000000] R10: ffff89773fa20000 R11: 0000000000000001 R12: ffff89773f99f6c0
[    0.000000] R13: ffffffff8200e920 R14: ffffffff8201c2e0 R15: ffffffff81e03fa8
[    0.000000] FS:  0000000000000000(0000) GS:ffff897162c00000(0000) 
knlGS:0000000000000000
[    0.000000] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[    0.000000] CR2: ffffc90000000004 CR3: 0000000001e0a000 CR4: 0000000000000630
[    0.000000] Stack:
[    0.000000]  ffffffffffffffff ffff89773f99f6c0 ffffffff8200e920 
ffffffff8201c2e0
[    0.000000]  ffffffff81e03f20 ffffffff81f7df00 ffffffff81e03f30 
ffffffff81f6ee7a
[    0.000000]  ffffffff81e03f40 ffffffff81f6ee4a ffffffff81e03f80 
ffffffff81f63f71
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff81f7df00>] hpet_enable+0x1e/0x20
[    0.000000]  [<ffffffff81f6ee7a>] hpet_time_init+0x9/0x19
[    0.000000]  [<ffffffff81f6ee4a>] x86_late_time_init+0x10/0x17
[    0.000000]  [<ffffffff81f63f71>] start_kernel+0x3d8/0x4aa
[    0.000000]  [<ffffffff81f63120>] ? early_idt_handler_array+0x120/0x120
[    0.000000]  [<ffffffff81f63339>] x86_64_start_reservations+0x2a/0x2c
[    0.000000]  [<ffffffff81f63485>] x86_64_start_kernel+0x14a/0x16d
[    0.000000] Code: 01 00 00 00 41 5c 5d c3 55 48 8b 3d 63 f4 18 00 be 00 04 
00 00 48 89 e5 41 56 41 55 41 54 53 e8 f7 f2 0e ff 48 89 05 d8 f4 18 00 <8b> 48 
04 b8 e9 03 00 00 48 8b 15 c9 f4 18 00 8b 52 10 ff c2 75 
[    0.000000] RIP  [<ffffffff81f7dc60>] hpet_enable.part.13+0x23/0x2a5
[    0.000000]  RSP <ffffffff81e03ef0>
[    0.000000] CR2: ffffc90000000004
[    0.000000] ---[ end trace 404be15fe05aa681 ]---
[    0.000000] Kernel panic - not syncing: Attempted to kill the idle task!
[    0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the idle 
task!

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https://bugs.launchpad.net/bugs/1769053

Title:
  Cannot start a guest with more than 1TB of RAM

Status in QEMU:
  Incomplete
Status in qemu package in Ubuntu:
  Incomplete

Bug description:
  Attempting to start a KVM guest with more than 1TB of RAM fails.

  It looks like we might need some extra patches:
  https://lists.gnu.org/archive/html/qemu-discuss/2017-12/msg00005.html

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: qemu-system-x86 1:2.11+dfsg-1ubuntu7
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CurrentDesktop: Unity:Unity7:ubuntu
  Date: Fri May  4 16:21:14 2018
  InstallationDate: Installed on 2017-04-05 (393 days ago)
  InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
  MachineType: Dell Inc. XPS 13 9360
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-20-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash transparent_hugepage=madvise 
vt.handoff=1
  SourcePackage: qemu
  UpgradeStatus: Upgraded to bionic on 2018-04-30 (3 days ago)
  dmi.bios.date: 02/26/2018
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.6.2
  dmi.board.name: 0PF86Y
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr2.6.2:bd02/26/2018:svnDellInc.:pnXPS139360:pvr:rvnDellInc.:rn0PF86Y:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 13 9360
  dmi.sys.vendor: Dell Inc.

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