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: 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 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