kernel BUG at arch/x86/xen/p2m.c:542

["John L. Poole" <jlpoole56@xxxxxxxxx>]

I'm building a new Gentoo server with Xen (4.16.6_pre1) on new hardware
and my first attempt to create
the first guest domain resulted in failure with a dmesg trace:

  3013  [Tue Dec 26 11:12:04 2023] ------------[ cut here ]------------
  3014  [Tue Dec 26 11:12:04 2023] kernel BUG at arch/x86/xen/p2m.c:542!
  3015  [Tue Dec 26 11:12:04 2023] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
  3016	[Tue Dec 26 11:12:04 2023] CPU: 19 PID: 3555 Comm: xenstored Not tainted 
6.1.67-gentoo-x86_64 #1
  3017	[Tue Dec 26 11:12:04 2023] Hardware name: ASRock X670E Steel 
Legend/X670E Steel Legend, BIOS 1.28 07/27/2023
  3018  [Tue Dec 26 11:12:04 2023] RIP: e030:xen_alloc_p2m_entry+0x485/0x8c0
  3019	[Tue Dec 26 11:12:04 2023] Code: 3d a8 6c 8a 01 73 5d 48 8b 05 a7 6c 8a 
01 48 8b 04 f8 48 83 f8 ff 74 59 48 bf ff ff ff ff ff ff ff 3f 48 21 c7 
e9 60 fc ff ff <0f> 0b 49 8d 7e 08 4c 89 f1 48 c7 c0 ff ff ff ff 49 c7 
06 ff ff ff
  3020  [Tue Dec 26 11:12:04 2023] RSP: e02b:ffffc9004284fd80 EFLAGS: 00010246
  3021	[Tue Dec 26 11:12:04 2023] RAX: 0000000000000000 RBX: 0000000010007fff 
RCX: ffffffff82610000
  3022	[Tue Dec 26 11:12:04 2023] RDX: 0000000000000000 RSI: ffffc9008003fff8 
RDI: 000000000e54d067
  3023	[Tue Dec 26 11:12:04 2023] RBP: ffffc9004284fe28 R08: ffffea0000000000 
R09: 0000000000000000
  3024	[Tue Dec 26 11:12:04 2023] R10: 0000000000000000 R11: ffff898088000000 
R12: ffffc9008003fff8
  3025	[Tue Dec 26 11:12:04 2023] R13: 0000000000000000 R14: 0000000010008000 
R15: 0000000010008000
  3026	[Tue Dec 26 11:12:04 2023] FS: 00007f5ea714ac40(0000) 
GS:ffff88901f0c0000(0000) knlGS:0000000000000000
  3027  [Tue Dec 26 11:12:04 2023] CS: e030 DS: 0000 ES: 0000 CR0: 
0000000080050033
  3028	[Tue Dec 26 11:12:04 2023] CR2: 0000563fa8a34000 CR3: 0000000106ba6000 
CR4: 0000000000050660
  3029  [Tue Dec 26 11:12:04 2023] Call Trace:
  3030  [Tue Dec 26 11:12:04 2023] <TASK>
  3031  [Tue Dec 26 11:12:04 2023] ? __die_body.cold+0x1a/0x1f
  3032  [Tue Dec 26 11:12:04 2023] ? die+0x2a/0x50
  3033  [Tue Dec 26 11:12:04 2023] ? do_trap+0xc5/0x110
  3034  [Tue Dec 26 11:12:04 2023] ? xen_alloc_p2m_entry+0x485/0x8c0
  3035  [Tue Dec 26 11:12:04 2023] ? do_error_trap+0x6a/0x90
  3036  [Tue Dec 26 11:12:04 2023] ? xen_alloc_p2m_entry+0x485/0x8c0
  3037  [Tue Dec 26 11:12:04 2023] ? exc_invalid_op+0x4c/0x60
  3038  [Tue Dec 26 11:12:04 2023] ? xen_alloc_p2m_entry+0x485/0x8c0
  3039  [Tue Dec 26 11:12:04 2023] ? asm_exc_invalid_op+0x16/0x20
  3040  [Tue Dec 26 11:12:04 2023] ? xen_alloc_p2m_entry+0x485/0x8c0
  3041  [Tue Dec 26 11:12:04 2023] xen_alloc_unpopulated_pages+0x9a/0x430
  3042  [Tue Dec 26 11:12:04 2023] gnttab_alloc_pages+0x14/0x40
  3043  [Tue Dec 26 11:12:04 2023] gntdev_alloc_map+0x1cf/0x2e0
  3044  [Tue Dec 26 11:12:04 2023] gntdev_ioctl+0x307/0x550
  3045  [Tue Dec 26 11:12:04 2023] __x64_sys_ioctl+0x90/0xd0
  3046  [Tue Dec 26 11:12:04 2023] do_syscall_64+0x3b/0x90
  3047  [Tue Dec 26 11:12:04 2023] entry_SYSCALL_64_after_hwframe+0x64/0xce
  3048  [Tue Dec 26 11:12:04 2023] RIP: 0033:0x7f5ea7261d0b
  3049	[Tue Dec 26 11:12:04 2023] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 
c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 
00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 
25 28 00 00
  3050	[Tue Dec 26 11:12:04 2023] RSP: 002b:00007fffc998b0e0 EFLAGS: 00000246 
ORIG_RAX: 0000000000000010
  3051	[Tue Dec 26 11:12:04 2023] RAX: ffffffffffffffda RBX: 0000000000001000 
RCX: 00007f5ea7261d0b
  3052	[Tue Dec 26 11:12:04 2023] RDX: 00007fffc998b140 RSI: 0000000000184700 
RDI: 000000000000000c
  3053	[Tue Dec 26 11:12:04 2023] RBP: 00007fffc998b1f0 R08: 00007fffc998b21c 
R09: 00007fffc998b140
  3054	[Tue Dec 26 11:12:04 2023] R10: 00007fffc998b21c R11: 0000000000000246 
R12: 0000000000000001
  3055	[Tue Dec 26 11:12:04 2023] R13: 0000000000000003 R14: 000000000000000c 
R15: 00007fffc998b140
  3056  [Tue Dec 26 11:12:04 2023] </TASK>
  3057	[Tue Dec 26 11:12:04 2023] Modules linked in: xen_pciback cfg80211 8021q 
garp mrp vfat fat amdgpu mfd_core iommu_v2 gpu_sched drm_buddy 
snd_hda_codec_realtek i2c_algo_bit drm_ttm_helper snd_hda_codec_generic 
ledtrig_audio snd_hda_codec_hdmi ttm drm_display_helper snd_hda_intel 
cec btusb intel_rapl_msr snd_intel_dspcfg btrtl intel_rapl_common 
rc_core btbcm snd_intel_sdw_acpi snd_hda_codec btintel sd_mod 
crct10dif_pclmul snd_hda_core drm_kms_helper bluetooth snd_hwdep 
ghash_clmulni_intel snd_pcm sha512_ssse3 drm sp5100_tco ecdh_generic 
sha256_ssse3 uas snd_timer rfkill i2c_piix4 wmi_bmof joydev sha1_ssse3 
usb_storage ecc pcspkr efi_pstore k10temp snd i2c_core soundcore ccp 
video wmi backlight gpio_amdpt gpio_generic mac_hid efivarfs xfs nvme 
nvme_core xhci_pci crc32_pclmul xhci_pci_renesas crc32c_intel t10_pi 
aesni_intel crypto_simd cryptd crc64_rocksoft r8169 ahci realtek 
xhci_hcd mdio_devres crc64 libahci libphy
  3058  [Tue Dec 26 11:12:04 2023] ---[ end trace 0000000000000000 ]---

I've logged a bug in Gentoo's Bug system with all the details and 
background:
     https://bugs.gentoo.org/920747

I've posted preserved colorized "scripts" of the attempt and dmesg 
output and
HTML conversions with line numbers, along with relevent files at:

https://salemdata.us/xen/20231226_bug/

I am not posting to xen developers because 
https://xenproject.org/help/mailing-list/ instructs:
"Please do not use this list for technical support queries."

Thank you,

John Poole