L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details. general protection fault, probably for non-canonical address 0xe06ff51e0003ea00: 0000 [#1] PREEMPT SMP KASAN KASAN: maybe wild-memory-access in range [0x037fc8f0001f5000-0x037fc8f0001f5007] CPU: 1 PID: 372 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:rmap_get_first arch/x86/kvm/mmu/mmu.c:1120 [inline] RIP: 0010:__rmap_write_protect+0x2d/0x3a0 arch/x86/kvm/mmu/mmu.c:1242 Code: e5 41 57 41 56 41 55 41 54 53 48 83 ec 18 41 89 f4 48 89 fb 49 be 00 00 00 00 00 fc ff df e8 ea 91 4f 00 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 b4 0d 8e 00 4c 8b 33 31 ff 4c 89 RSP: 0018:ffffc90000b57898 EFLAGS: 00010206 RAX: 006ff91e0003ea00 RBX: 037fc8f0001f5000 RCX: ffff8881109162c0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 037fc8f0001f5000 RBP: ffffc90000b578d8 R08: 0000000000000004 R09: 0000000000000003 R10: fffff5200016af28 R11: 1ffff9200016af28 R12: 0000000000000001 R13: 037fc8f0001f5000 R14: dffffc0000000000 R15: ffff88812a430818 FS: 00005555780ef500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000fe9008 CR3: 000000010a923000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kvm_mmu_slot_gfn_write_protect+0x14a/0x270 arch/x86/kvm/mmu/mmu.c:1415 kvm_arch_mmu_enable_log_dirty_pt_masked+0x10c/0x3d0 arch/x86/kvm/mmu/mmu.c:1388 kvm_reset_dirty_gfn+0x19d/0x210 virt/kvm/dirty_ring.c:65 kvm_dirty_ring_reset+0x4a9/0x620 virt/kvm/dirty_ring.c:152 kvm_vm_ioctl_reset_dirty_pages+0x1a3/0x3b0 virt/kvm/kvm_main.c:4368 kvm_vm_ioctl+0x385/0xa80 virt/kvm/kvm_main.c:4643 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0x121/0x1a0 fs/ioctl.c:860 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:860 x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f0c0e587ec9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffca2915eb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f0c0e7defa0 RCX: 00007f0c0e587ec9 RDX: 0000000000000000 RSI: 000000000000aec7 RDI: 0000000000000004 RBP: 00007f0c0e60af91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0c0e7defa0 R14: 00007f0c0e7defa0 R15: 0000000000000002 Modules linked in: ---[ end trace 9a468e75569788de ]--- RIP: 0010:rmap_get_first arch/x86/kvm/mmu/mmu.c:1120 [inline] RIP: 0010:__rmap_write_protect+0x2d/0x3a0 arch/x86/kvm/mmu/mmu.c:1242 Code: e5 41 57 41 56 41 55 41 54 53 48 83 ec 18 41 89 f4 48 89 fb 49 be 00 00 00 00 00 fc ff df e8 ea 91 4f 00 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 b4 0d 8e 00 4c 8b 33 31 ff 4c 89 RSP: 0018:ffffc90000b57898 EFLAGS: 00010206 RAX: 006ff91e0003ea00 RBX: 037fc8f0001f5000 RCX: ffff8881109162c0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 037fc8f0001f5000 RBP: ffffc90000b578d8 R08: 0000000000000004 R09: 0000000000000003 R10: fffff5200016af28 R11: 1ffff9200016af28 R12: 0000000000000001 R13: 037fc8f0001f5000 R14: dffffc0000000000 R15: ffff88812a430818 FS: 00005555780ef500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000fe9008 CR3: 000000010a923000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: e5 41 in $0x41,%eax 2: 57 push %rdi 3: 41 56 push %r14 5: 41 55 push %r13 7: 41 54 push %r12 9: 53 push %rbx a: 48 83 ec 18 sub $0x18,%rsp e: 41 89 f4 mov %esi,%r12d 11: 48 89 fb mov %rdi,%rbx 14: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14 1b: fc ff df 1e: e8 ea 91 4f 00 call 0x4f920d 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 b4 0d 8e 00 call 0x8e0ded 39: 4c 8b 33 mov (%rbx),%r14 3c: 31 ff xor %edi,%edi 3e: 4c rex.WR 3f: 89 .byte 0x89