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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="/Vt1VMVM7T/i56yz" Content-Disposition: inline X-purgate-ID: tlsNG-c201ff/1781879888-9CFCA127-90C80F89/0/0 X-purgate-type: clean X-purgate-size: 2681 --/Vt1VMVM7T/i56yz Content-Type: text/plain; protected-headers=v1; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Date: Fri, 19 Jun 2026 16:38:03 +0200 From: Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?= To: xen-devel Subject: Linux dom0 hangs on boot with Xen 4.22 and Heads firmware Hi, After updating Xen to 4.22-rc2 on a system with Heads firmware, dom0 doesn't start anymore. It worked fine with Xen 4.19. The last messages on console are: [ 1.495140] installing Xen timer for CPU 2 [ 1.496149] installing Xen timer for CPU 4 [ 1.496587] installing Xen timer for CPU 5 [ 1.496809] installing Xen timer for CPU 7 [ 0.008235] [Firmware Bug]: CPU 2: APIC ID mismatch. CPUID: 0x0002= APIC: 0x0028 [ 0.008235] [Firmware Bug]: CPU 2: APIC ID mismatch. Firmware: 0x0= 011 APIC: 0x0028 [ 1.497055] cpu 2 spinlock event irq 200 [ 0.008235] [Firmware Bug]: CPU 4: APIC ID mismatch. CPUID: 0x0004= APIC: 0x0000 [ 0.008235] [Firmware Bug]: CPU 4: APIC ID mismatch. Firmware: 0x0= 019 APIC: 0x0000 [ 1.497074] cpu 4 spinlock event irq 201 [ 0.008235] [Firmware Bug]: CPU 5: APIC ID mismatch. CPUID: 0x0005= APIC: 0x0002 [ 0.008235] [Firmware Bug]: CPU 5: APIC ID mismatch. Firmware: 0x0= 021 APIC: 0x0002 [ 1.497074] cpu 5 spinlock event irq 202 [ 0.008235] [Firmware Bug]: CPU 7: APIC I Full console log (containing both successful boot of Xen 4.19, and then reboot into 4.22): https://openqa.qubes-os.org/tests/184780/logfile?filename=3Dserial0.txt It doesn't reach loading graphics driver in dom0, so I don't have anything interesting on VGA (the last output is about the kexec call done by Heads). But at least I have a serial console. This happens both on older Thinkpad t430 (Ivy Bridge), and newer Novacustom= V54 (ADL). --=20 Best Regards, Marek Marczykowski-G=C3=B3recki Invisible Things Lab --/Vt1VMVM7T/i56yz Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhrpukzGPukRmQqkK24/THMrX1ywFAmo1VEsACgkQ24/THMrX 1yw2xAf+Lz4uCwl+0iYr6Iw5VV0wWWIWGhsQVAEf0WuraFM9i4C+qjgs5TTMdDgT jBHBmobjHqR/k7m1TuqZzUmtvJ5NuAMwQ19ECG69wqjkPOWAkX/JKDPJxD8TNJHJ Ey7ItE2a1idckrhiXUjJTKnhn7DYbCLuFwHVv/3qKZy9cuUmSVRfn/Xk3MAJdbu6 4Qq5TLaBxJbuzoSRyAF5n0GMQJ4MFugNctmhz42jT8wVn9slAeVtRx3yKPlea7ZI aU7P59bncb5c0ydME9MNluHf9FEJTd9eesuXMyqgdr+RQd5JJ+y614dxt4AIhII2 tZVSkqiZWVdKWYx3l2neVJzKA5khSQ== =Snqt -----END PGP SIGNATURE----- --/Vt1VMVM7T/i56yz--