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AJvYcCWyZtjKj4ZfORZ/j2EmKXbIn/aLFglnI1put+8kBtN6fJ/1v9Py0Ik72AQtAxKGpeAo+VJOBDDPY7lm+lFNdH+eOiFt+VjJNKsy+NpeO/Y= X-Gm-Message-State: AOJu0Yz15UGMTGQmnkd1epJlSNtRiZulWJ/y7pFVC5hgLzfWIoQjW+Yp dBuREoiKuK8Cj3AYCrSqpyNeVlzrtb8nXDsf/2zryxR0C641MRD4RPJ3LrTuxl5neKLSWrIOwGT yKdw= X-Google-Smtp-Source: AGHT+IFJLCJWmC5hDusy9Thd1NXH7E6g7dQqe371cws5FnhIU8xJCIyINLrPG715Qz+H6HLt5BxWzg== X-Received: by 2002:a81:5209:0:b0:609:fff2:3bbc with SMTP id 00721157ae682-62a08f152c5mr112070127b3.49.1716894472527; Tue, 28 May 2024 04:07:52 -0700 (PDT) Message-ID: Date: Tue, 28 May 2024 12:07:50 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Linux HVM fails to start with PANIC: early exception 0x00 IP 0010:clear_page_orig+0x12/0x40 error 0 From: Andrew Cooper To: =?UTF-8?Q?Marek_Marczykowski-G=C3=B3recki?= , xen-devel References: <653ba4f5-dc1e-48b9-9833-35b47bfc5fc4@citrix.com> Content-Language: en-GB Autocrypt: addr=andrew.cooper3@citrix.com; keydata= xsFNBFLhNn8BEADVhE+Hb8i0GV6mihnnr/uiQQdPF8kUoFzCOPXkf7jQ5sLYeJa0cQi6Penp VtiFYznTairnVsN5J+ujSTIb+OlMSJUWV4opS7WVNnxHbFTPYZVQ3erv7NKc2iVizCRZ2Kxn srM1oPXWRic8BIAdYOKOloF2300SL/bIpeD+x7h3w9B/qez7nOin5NzkxgFoaUeIal12pXSR Q354FKFoy6Vh96gc4VRqte3jw8mPuJQpfws+Pb+swvSf/i1q1+1I4jsRQQh2m6OTADHIqg2E ofTYAEh7R5HfPx0EXoEDMdRjOeKn8+vvkAwhviWXTHlG3R1QkbE5M/oywnZ83udJmi+lxjJ5 YhQ5IzomvJ16H0Bq+TLyVLO/VRksp1VR9HxCzItLNCS8PdpYYz5TC204ViycobYU65WMpzWe LFAGn8jSS25XIpqv0Y9k87dLbctKKA14Ifw2kq5OIVu2FuX+3i446JOa2vpCI9GcjCzi3oHV e00bzYiHMIl0FICrNJU0Kjho8pdo0m2uxkn6SYEpogAy9pnatUlO+erL4LqFUO7GXSdBRbw5 gNt25XTLdSFuZtMxkY3tq8MFss5QnjhehCVPEpE6y9ZjI4XB8ad1G4oBHVGK5LMsvg22PfMJ ISWFSHoF/B5+lHkCKWkFxZ0gZn33ju5n6/FOdEx4B8cMJt+cWwARAQABzSlBbmRyZXcgQ29v cGVyIDxhbmRyZXcuY29vcGVyM0BjaXRyaXguY29tPsLBegQTAQgAJAIbAwULCQgHAwUVCgkI CwUWAgMBAAIeAQIXgAUCWKD95wIZAQAKCRBlw/kGpdefoHbdD/9AIoR3k6fKl+RFiFpyAhvO 59ttDFI7nIAnlYngev2XUR3acFElJATHSDO0ju+hqWqAb8kVijXLops0gOfqt3VPZq9cuHlh IMDquatGLzAadfFx2eQYIYT+FYuMoPZy/aTUazmJIDVxP7L383grjIkn+7tAv+qeDfE+txL4 SAm1UHNvmdfgL2/lcmL3xRh7sub3nJilM93RWX1Pe5LBSDXO45uzCGEdst6uSlzYR/MEr+5Z JQQ32JV64zwvf/aKaagSQSQMYNX9JFgfZ3TKWC1KJQbX5ssoX/5hNLqxMcZV3TN7kU8I3kjK mPec9+1nECOjjJSO/h4P0sBZyIUGfguwzhEeGf4sMCuSEM4xjCnwiBwftR17sr0spYcOpqET ZGcAmyYcNjy6CYadNCnfR40vhhWuCfNCBzWnUW0lFoo12wb0YnzoOLjvfD6OL3JjIUJNOmJy RCsJ5IA/Iz33RhSVRmROu+TztwuThClw63g7+hoyewv7BemKyuU6FTVhjjW+XUWmS/FzknSi dAG+insr0746cTPpSkGl3KAXeWDGJzve7/SBBfyznWCMGaf8E2P1oOdIZRxHgWj0zNr1+ooF /PzgLPiCI4OMUttTlEKChgbUTQ+5o0P080JojqfXwbPAyumbaYcQNiH1/xYbJdOFSiBv9rpt TQTBLzDKXok86M7BTQRS4TZ/ARAAkgqudHsp+hd82UVkvgnlqZjzz2vyrYfz7bkPtXaGb9H4 Rfo7mQsEQavEBdWWjbga6eMnDqtu+FC+qeTGYebToxEyp2lKDSoAsvt8w82tIlP/EbmRbDVn 7bhjBlfRcFjVYw8uVDPptT0TV47vpoCVkTwcyb6OltJrvg/QzV9f07DJswuda1JH3/qvYu0p vjPnYvCq4NsqY2XSdAJ02HrdYPFtNyPEntu1n1KK+gJrstjtw7KsZ4ygXYrsm/oCBiVW/OgU g/XIlGErkrxe4vQvJyVwg6YH653YTX5hLLUEL1NS4TCo47RP+wi6y+TnuAL36UtK/uFyEuPy wwrDVcC4cIFhYSfsO0BumEI65yu7a8aHbGfq2lW251UcoU48Z27ZUUZd2Dr6O/n8poQHbaTd 6bJJSjzGGHZVbRP9UQ3lkmkmc0+XCHmj5WhwNNYjgbbmML7y0fsJT5RgvefAIFfHBg7fTY/i kBEimoUsTEQz+N4hbKwo1hULfVxDJStE4sbPhjbsPCrlXf6W9CxSyQ0qmZ2bXsLQYRj2xqd1 bpA+1o1j2N4/au1R/uSiUFjewJdT/LX1EklKDcQwpk06Af/N7VZtSfEJeRV04unbsKVXWZAk uAJyDDKN99ziC0Wz5kcPyVD1HNf8bgaqGDzrv3TfYjwqayRFcMf7xJaL9xXedMcAEQEAAcLB XwQYAQgACQUCUuE2fwIbDAAKCRBlw/kGpdefoG4XEACD1Qf/er8EA7g23HMxYWd3FXHThrVQ HgiGdk5Yh632vjOm9L4sd/GCEACVQKjsu98e8o3ysitFlznEns5EAAXEbITrgKWXDDUWGYxd pnjj2u+GkVdsOAGk0kxczX6s+VRBhpbBI2PWnOsRJgU2n10PZ3mZD4Xu9kU2IXYmuW+e5KCA vTArRUdCrAtIa1k01sPipPPw6dfxx2e5asy21YOytzxuWFfJTGnVxZZSCyLUO83sh6OZhJkk b9rxL9wPmpN/t2IPaEKoAc0FTQZS36wAMOXkBh24PQ9gaLJvfPKpNzGD8XWR5HHF0NLIJhgg 4ZlEXQ2fVp3XrtocHqhu4UZR4koCijgB8sB7Tb0GCpwK+C4UePdFLfhKyRdSXuvY3AHJd4CP 4JzW0Bzq/WXY3XMOzUTYApGQpnUpdOmuQSfpV9MQO+/jo7r6yPbxT7CwRS5dcQPzUiuHLK9i nvjREdh84qycnx0/6dDroYhp0DFv4udxuAvt1h4wGwTPRQZerSm4xaYegEFusyhbZrI0U9tJ B8WrhBLXDiYlyJT6zOV2yZFuW47VrLsjYnHwn27hmxTC/7tvG3euCklmkn9Sl9IAKFu29RSo d5bD8kMSCYsTqtTfT6W4A3qHGvIDta3ptLYpIAOD2sY3GYq2nf3Bbzx81wZK14JdDDHUX2Rs 6+ahAA== In-Reply-To: <653ba4f5-dc1e-48b9-9833-35b47bfc5fc4@citrix.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 12/05/2024 3:48 pm, Andrew Cooper wrote: > On 12/05/2024 3:16 am, Marek Marczykowski-Górecki wrote: >> Hi, >> >> I've got a report[1] that after some update Linux HVM fails to start with the >> error as in the subject. It looks to be caused by some change between >> Xen 4.17.3 and 4.17.4. Here the failure is on Linux 6.6.25 (both dom0 >> and domU), but the 6.1.62 that worked with older Xen before, now fails >> too. The full error (logged via earlyprintk=xen) is: >> >> [ 0.009500] Using GB pages for direct mapping >> PANIC: early exception 0x00 IP 10:ffffffffb01c32e2 error 0 cr2 0xffffa08649801000 >> [ 0.009606] CPU: 0 PID: 0 Comm: swapper Not tainted 6.6.25-1.qubes.fc37.x86_64 #1 >> [ 0.009665] Hardware name: Xen HVM domU, BIOS 4.17.4 04/26/2024 >> [ 0.009710] RIP: 0010:clear_page_orig+0x12/0x40 >> [ 0.009766] Code: 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 31 c0 b9 40 00 00 00 0f 1f 44 00 00 ff c9 <48> 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47 >> [ 0.009862] RSP: 0000:ffffffffb0e03d58 EFLAGS: 00010016 ORIG_RAX: 0000000000000000 >> [ 0.009915] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000003f >> [ 0.009967] RDX: 0000000000009801 RSI: 0000000000000000 RDI: ffffa08649801000 >> [ 0.010015] RBP: 0000000000000001 R08: 0000000000000001 R09: 6b7f283562d74b16 >> [ 0.010063] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 >> [ 0.010112] R13: 0000000000000000 R14: ffffffffb0e22a08 R15: ffffa08640000000 >> [ 0.010161] FS: 0000000000000000(0000) GS:ffffffffb16ea000(0000) knlGS:0000000000000000 >> [ 0.010214] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> [ 0.010257] CR2: ffffa08649801000 CR3: 0000000008e80000 CR4: 00000000000000b0 >> [ 0.010310] Call Trace: >> [ 0.010341] >> [ 0.010372] ? early_fixup_exception+0xf7/0x190 >> [ 0.010416] ? early_idt_handler_common+0x2f/0x3a >> [ 0.010460] ? clear_page_orig+0x12/0x40 >> [ 0.010501] ? alloc_low_pages+0xeb/0x150 >> [ 0.010541] ? __kernel_physical_mapping_init+0x1d2/0x630 >> [ 0.010588] ? init_memory_mapping+0x83/0x160 >> [ 0.010631] ? init_mem_mapping+0x9a/0x460 >> [ 0.010669] ? memblock_reserve+0x6d/0xf0 >> [ 0.010709] ? setup_arch+0x796/0xf90 >> [ 0.010748] ? start_kernel+0x63/0x420 >> [ 0.010787] ? x86_64_start_reservations+0x18/0x30 >> [ 0.010828] ? x86_64_start_kernel+0x96/0xa0 >> [ 0.010868] ? secondary_startup_64_no_verify+0x18f/0x19b >> [ 0.010918] >> >> I'm pretty sure the exception 0 is misleading here, I don't see how it >> could be #DE. >> >> More logs (including full hypervisor log) are attached to the linked >> issue. >> >> This is on HP 240 g7, and my educated guess is it's Intel Celeron N4020 >> CPU. I cannot reproduce the issue on different hardware. >> >> PVH domains seems to work. >> >> Any ideas what could have happened here? > Yes. > > Revert the microcode back to revision 0x38 for now. The regression is fixed in revision 0x42. ~Andrew