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Message-ID: <68d27033.a70a0220.1b52b.02a8.GAE@google.com> Date: Tue, 23 Sep 2025 03:02:27 -0700 From: syzbot ci <syzbot+ci3162984bece220f0@...kaller.appspotmail.com> To: bp@...en8.de, david.kaplan@....com, huibo.wang@....com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, naveen.rao@....com, neeraj.upadhyay@....com, nikunj@....com, pbonzini@...hat.com, santosh.shukla@....com, seanjc@...gle.com, suravee.suthikulpanit@....com, thomas.lendacky@....com, tiala@...rosoft.com, vasant.hegde@....com Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com Subject: [syzbot ci] Re: AMD: Add Secure AVIC KVM Support syzbot ci has tested the following series [v2] AMD: Add Secure AVIC KVM Support https://lore.kernel.org/all/20250923050317.205482-1-Neeraj.Upadhyay@amd.com * [RFC PATCH v2 01/17] KVM: x86/lapic: Differentiate protected APIC interrupt mechanisms * [RFC PATCH v2 02/17] x86/cpufeatures: Add Secure AVIC CPU feature * [RFC PATCH v2 03/17] KVM: SVM: Add support for Secure AVIC capability in KVM * [RFC PATCH v2 04/17] KVM: SVM: Set guest APIC protection flags for Secure AVIC * [RFC PATCH v2 05/17] KVM: SVM: Do not intercept SECURE_AVIC_CONTROL MSR for SAVIC guests * [RFC PATCH v2 06/17] KVM: SVM: Implement interrupt injection for Secure AVIC * [RFC PATCH v2 07/17] KVM: SVM: Add IPI Delivery Support for Secure AVIC * [RFC PATCH v2 08/17] KVM: SVM: Do not inject exception for Secure AVIC * [RFC PATCH v2 09/17] KVM: SVM: Do not intercept exceptions for Secure AVIC guests * [RFC PATCH v2 10/17] KVM: SVM: Set VGIF in VMSA area for Secure AVIC guests * [RFC PATCH v2 11/17] KVM: SVM: Enable NMI support for Secure AVIC guests * [RFC PATCH v2 12/17] KVM: SVM: Add VMGEXIT handler for Secure AVIC backing page * [RFC PATCH v2 13/17] KVM: SVM: Add IOAPIC EOI support for Secure AVIC guests * [RFC PATCH v2 14/17] KVM: x86/ioapic: Disable RTC EOI tracking for protected APIC guests * [RFC PATCH v2 15/17] KVM: SVM: Check injected timers for Secure AVIC guests * [RFC PATCH v2 16/17] KVM: x86/cpuid: Disable paravirt APIC features for protected APIC * [RFC PATCH v2 17/17] KVM: SVM: Advertise Secure AVIC support for SNP guests and found the following issue: general protection fault in kvm_apply_cpuid_pv_features_quirk Full report is available here: https://ci.syzbot.org/series/887b895e-0315-498c-99e5-966704f16fb5 *** general protection fault in kvm_apply_cpuid_pv_features_quirk tree: kvm-next URL: https://kernel.googlesource.com/pub/scm/virt/kvm/kvm/ base: a6ad54137af92535cfe32e19e5f3bc1bb7dbd383 arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/a65d3de7-36d8-4181-8566-80e0f0719955/config C repro: https://ci.syzbot.org/findings/939a8c5a-41b2-4e9b-9129-80dff6d039c4/c_repro syz repro: https://ci.syzbot.org/findings/939a8c5a-41b2-4e9b-9129-80dff6d039c4/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc0000000013: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000098-0x000000000000009f] CPU: 0 UID: 0 PID: 5992 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:kvm_apply_cpuid_pv_features_quirk+0x38c/0x4f0 arch/x86/kvm/cpuid.c:248 Code: c1 e8 03 80 3c 10 00 74 12 4c 89 ff e8 9d d8 d4 00 48 ba 00 00 00 00 00 fc ff df bb 9c 00 00 00 49 03 1f 48 89 d8 48 c1 e8 03 <0f> b6 04 10 84 c0 0f 85 c2 00 00 00 80 3b 00 74 2e e8 4e 6a 71 00 RSP: 0018:ffffc90004f871a0 EFLAGS: 00010203 RAX: 0000000000000013 RBX: 000000000000009c RCX: ffff888107562440 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90004f87250 R08: 0000000000000005 R09: 000000008b838003 R10: ffffc90004f872e0 R11: fffff520009f0e61 R12: ffff888034f30970 R13: 1ffff110069e612e R14: ffff888020170528 R15: ffff888034f302f8 FS: 000055556af3f500(0000) GS:ffff8880b861b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffff40f56c8 CR3: 0000000020cc0000 CR4: 0000000000352ef0 Call Trace: <TASK> kvm_vcpu_after_set_cpuid+0xc75/0x18a0 arch/x86/kvm/cpuid.c:432 kvm_set_cpuid+0xea4/0x1110 arch/x86/kvm/cpuid.c:551 kvm_vcpu_ioctl_set_cpuid2+0xbe/0x130 arch/x86/kvm/cpuid.c:626 kvm_arch_vcpu_ioctl+0x13c5/0x2a80 arch/x86/kvm/x86.c:5975 kvm_vcpu_ioctl+0x74d/0xe90 virt/kvm/kvm_main.c:4637 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f14f278e82b 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 RSP: 002b:00007ffff40f55f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffff40f5d40 RCX: 00007f14f278e82b RDX: 00007ffff40f5d40 RSI: 000000004008ae90 RDI: 0000000000000005 RBP: 00002000008fc000 R08: 0000000000000000 R09: 0000000000000006 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000063 R14: 00002000008fb000 R15: 00002000008fc800 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:kvm_apply_cpuid_pv_features_quirk+0x38c/0x4f0 arch/x86/kvm/cpuid.c:248 Code: c1 e8 03 80 3c 10 00 74 12 4c 89 ff e8 9d d8 d4 00 48 ba 00 00 00 00 00 fc ff df bb 9c 00 00 00 49 03 1f 48 89 d8 48 c1 e8 03 <0f> b6 04 10 84 c0 0f 85 c2 00 00 00 80 3b 00 74 2e e8 4e 6a 71 00 RSP: 0018:ffffc90004f871a0 EFLAGS: 00010203 RAX: 0000000000000013 RBX: 000000000000009c RCX: ffff888107562440 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90004f87250 R08: 0000000000000005 R09: 000000008b838003 R10: ffffc90004f872e0 R11: fffff520009f0e61 R12: ffff888034f30970 R13: 1ffff110069e612e R14: ffff888020170528 R15: ffff888034f302f8 FS: 000055556af3f500(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055df3be04900 CR3: 0000000020cc0000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: c1 e8 03 shr $0x3,%eax 3: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) 7: 74 12 je 0x1b 9: 4c 89 ff mov %r15,%rdi c: e8 9d d8 d4 00 call 0xd4d8ae 11: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 18: fc ff df 1b: bb 9c 00 00 00 mov $0x9c,%ebx 20: 49 03 1f add (%r15),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 0f b6 04 10 movzbl (%rax,%rdx,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 c2 00 00 00 jne 0xf8 36: 80 3b 00 cmpb $0x0,(%rbx) 39: 74 2e je 0x69 3b: e8 4e 6a 71 00 call 0x716a8e *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@...kaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@...glegroups.com.
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