syzbot has found a reproducer for the following issue on: HEAD commit: 61c3426aca2c Add linux-next specific files for 20221102 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=13596541880000 kernel config: https://syzkaller.appspot.com/x/.config?x=acb529cc910d907c dashboard link: https://syzkaller.appspot.com/bug?extid=8cdd16fd5a6c0565e227 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17d036de880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11d5e00a880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/cc56d88dd6a3/disk-61c3426a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5921b65b080f/vmlinux-61c3426a.xz kernel image: https://storage.googleapis.com/syzbot-assets/39cbd355fedd/bzImage-61c3426a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8cdd16fd5a6c0565e227@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: unable to handle page fault for address: fffffbc0000001d8 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 23ffe4067 P4D 23ffe4067 PUD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 5404 Comm: syz-executor526 Not tainted 6.1.0-rc3-next-20221102-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 RIP: 0010:gate_offset arch/x86/include/asm/desc_defs.h:100 [inline] RIP: 0010:handle_external_interrupt_irqoff arch/x86/kvm/vmx/vmx.c:6818 [inline] RIP: 0010:vmx_handle_exit_irqoff arch/x86/kvm/vmx/vmx.c:6830 [inline] RIP: 0010:vmx_handle_exit_irqoff+0x334/0x750 arch/x86/kvm/vmx/vmx.c:6822 Code: 00 01 be 01 03 00 00 48 89 ef e8 27 a4 e8 ff e9 96 fd ff ff e8 9d 3d 5c 00 48 89 e8 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 <0f> b6 0c 10 48 8d 45 01 48 89 c6 48 c1 ee 03 0f b6 14 16 48 89 ee RSP: 0018:ffffc90004217b38 EFLAGS: 00010806 RAX: 1fffffc0000001d8 RBX: ffff88801f964000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffffffff8120a3b3 RDI: 0000000000000005 RBP: fffffe0000000ec0 R08: 0000000000000005 R09: 0000000080000000 R10: 0000000080000000 R11: 0000000000000000 R12: 00000000800000ec R13: 0000000080000000 R14: 000000000121e226 R15: ffff88801f964038 FS: 0000555555e9c3c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffbc0000001d8 CR3: 00000000213a8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> vcpu_enter_guest+0x33d1/0x59e0 arch/x86/kvm/x86.c:10815 vcpu_run arch/x86/kvm/x86.c:10964 [inline] kvm_arch_vcpu_ioctl_run+0xa80/0x2b90 arch/x86/kvm/x86.c:11185 kvm_vcpu_ioctl+0x570/0xfc0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4065 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fb696cd1f89 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd0f7a3e18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffd0f7a3e50 RCX: 00007fb696cd1f89 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000d3e4 R10: 00007ffd0f7a3e20 R11: 0000000000000246 R12: 00000000000f4240 R13: 000000000000d3e4 R14: 00007ffd0f7a3e3c R15: 00007ffd0f7a3e40 </TASK> Modules linked in: CR2: fffffbc0000001d8 ---[ end trace 0000000000000000 ]--- RIP: 0010:gate_offset arch/x86/include/asm/desc_defs.h:100 [inline] RIP: 0010:handle_external_interrupt_irqoff arch/x86/kvm/vmx/vmx.c:6818 [inline] RIP: 0010:vmx_handle_exit_irqoff arch/x86/kvm/vmx/vmx.c:6830 [inline] RIP: 0010:vmx_handle_exit_irqoff+0x334/0x750 arch/x86/kvm/vmx/vmx.c:6822 Code: 00 01 be 01 03 00 00 48 89 ef e8 27 a4 e8 ff e9 96 fd ff ff e8 9d 3d 5c 00 48 89 e8 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 <0f> b6 0c 10 48 8d 45 01 48 89 c6 48 c1 ee 03 0f b6 14 16 48 89 ee RSP: 0018:ffffc90004217b38 EFLAGS: 00010806 RAX: 1fffffc0000001d8 RBX: ffff88801f964000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffffffff8120a3b3 RDI: 0000000000000005 RBP: fffffe0000000ec0 R08: 0000000000000005 R09: 0000000080000000 R10: 0000000080000000 R11: 0000000000000000 R12: 00000000800000ec R13: 0000000080000000 R14: 000000000121e226 R15: ffff88801f964038 FS: 0000555555e9c3c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffbc0000001d8 CR3: 00000000213a8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 01 add %al,(%rcx) 2: be 01 03 00 00 mov $0x301,%esi 7: 48 89 ef mov %rbp,%rdi a: e8 27 a4 e8 ff callq 0xffe8a436 f: e9 96 fd ff ff jmpq 0xfffffdaa 14: e8 9d 3d 5c 00 callq 0x5c3db6 19: 48 89 e8 mov %rbp,%rax 1c: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 23: fc ff df 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 0f b6 0c 10 movzbl (%rax,%rdx,1),%ecx <-- trapping instruction 2e: 48 8d 45 01 lea 0x1(%rbp),%rax 32: 48 89 c6 mov %rax,%rsi 35: 48 c1 ee 03 shr $0x3,%rsi 39: 0f b6 14 16 movzbl (%rsi,%rdx,1),%edx 3d: 48 89 ee mov %rbp,%rsi
