[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.184' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 63.722260][ T7043] 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. [ 63.772862][ T7043] ================================================================== [ 63.786162][ T7043] BUG: KASAN: slab-out-of-bounds in __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 63.799781][ T7043] Read of size 8 at addr ffff8880a3501468 by task syz-executor324/7043 [ 63.814058][ T7043] [ 63.818449][ T7043] CPU: 0 PID: 7043 Comm: syz-executor324 Not tainted 5.7.0-rc1-syzkaller #0 [ 63.832420][ T7043] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.852346][ T7043] Call Trace: [ 63.858167][ T7043] dump_stack+0x188/0x20d [ 63.865880][ T7043] print_address_description.constprop.0.cold+0xd3/0x315 [ 63.879206][ T7043] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 63.886467][ T7043] __kasan_report.cold+0x35/0x4d [ 63.893456][ T7043] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 63.900964][ T7043] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 63.910217][ T7043] kasan_report+0x33/0x50 [ 63.916958][ T7043] __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 63.925576][ T7043] ? __kvm_write_guest_page+0x170/0x170 [ 63.933250][ T7043] kvm_lapic_set_vapic_addr+0x88/0x180 [ 63.940574][ T7043] kvm_arch_vcpu_ioctl+0xf0d/0x2c20 [ 63.948425][ T7043] ? kvm_arch_vcpu_put+0x530/0x530 [ 63.955764][ T7043] ? lock_acquire+0x1f2/0x8f0 [ 63.962119][ T7043] ? kvm_vcpu_ioctl+0x175/0xe60 [ 63.968915][ T7043] ? lock_release+0x800/0x800 [ 63.975664][ T7043] ? find_held_lock+0x2d/0x110 [ 63.982801][ T7043] ? __mutex_lock+0x458/0x13c0 [ 63.989266][ T7043] ? find_held_lock+0x2d/0x110 [ 63.994815][ T7043] ? kvm_vcpu_ioctl+0x175/0xe60 [ 63.999949][ T7043] ? tomoyo_path_number_perm+0x1ee/0x4d0 [ 64.007782][ T7043] ? mutex_trylock+0x2c0/0x2c0 [ 64.014490][ T7043] ? lock_downgrade+0x840/0x840 [ 64.021678][ T7043] ? quarantine_put+0x119/0x1c0 [ 64.029690][ T7043] ? kfree+0x1eb/0x2b0 [ 64.034888][ T7043] ? tomoyo_path_number_perm+0x411/0x4d0 [ 64.041936][ T7043] ? lockdep_hardirqs_on+0x463/0x620 [ 64.047995][ T7043] ? tomoyo_path_number_perm+0x238/0x4d0 [ 64.054671][ T7043] kvm_vcpu_ioctl+0x866/0xe60 [ 64.060348][ T7043] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 64.067916][ T7043] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 64.074878][ T7043] ? do_vfs_ioctl+0x50c/0x12d0 [ 64.080368][ T7043] ? ioctl_file_clone+0x180/0x180 [ 64.086884][ T7043] kvm_vcpu_compat_ioctl+0x1ab/0x350 [ 64.092949][ T7043] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.100011][ T7043] ? kvm_vcpu_ioctl+0xe60/0xe60 [ 64.105557][ T7043] ? do_sys_open+0xc3/0x140 [ 64.111014][ T7043] ? kvm_vcpu_ioctl+0xe60/0xe60 [ 64.117408][ T7043] __ia32_compat_sys_ioctl+0x23d/0x2b0 [ 64.124237][ T7043] do_fast_syscall_32+0x270/0xe90 [ 64.129411][ T7043] entry_SYSENTER_compat+0x70/0x7f [ 64.134791][ T7043] [ 64.137627][ T7043] Allocated by task 7043: [ 64.143477][ T7043] save_stack+0x1b/0x40 [ 64.151242][ T7043] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 64.159384][ T7043] kvmalloc_node+0x61/0xf0 [ 64.164656][ T7043] kvm_set_memslot+0x115/0x1530 [ 64.170239][ T7043] __kvm_set_memory_region+0xcf7/0x1320 [ 64.176864][ T7043] __x86_set_memory_region+0x2a3/0x5a0 [ 64.185040][ T7043] vmx_create_vcpu+0x2107/0x2b40 [ 64.191137][ T7043] kvm_arch_vcpu_create+0x6ef/0xb80 [ 64.197446][ T7043] kvm_vm_ioctl+0x15f7/0x23e0 [ 64.203650][ T7043] kvm_vm_compat_ioctl+0x125/0x240 [ 64.210409][ T7043] __ia32_compat_sys_ioctl+0x23d/0x2b0 [ 64.217951][ T7043] do_fast_syscall_32+0x270/0xe90 [ 64.225616][ T7043] entry_SYSENTER_compat+0x70/0x7f [ 64.233295][ T7043] [ 64.236364][ T7043] Freed by task 0: [ 64.241279][ T7043] (stack is not available) [ 64.247515][ T7043] [ 64.251481][ T7043] The buggy address belongs to the object at ffff8880a3501000 [ 64.251481][ T7043] which belongs to the cache kmalloc-2k of size 2048 [ 64.269130][ T7043] The buggy address is located 1128 bytes inside of [ 64.269130][ T7043] 2048-byte region [ffff8880a3501000, ffff8880a3501800) [ 64.286603][ T7043] The buggy address belongs to the page: [ 64.293883][ T7043] page:ffffea00028d4040 refcount:1 mapcount:0 mapping:000000000622be4c index:0x0 [ 64.305772][ T7043] flags: 0xfffe0000000200(slab) [ 64.310645][ T7043] raw: 00fffe0000000200 ffffea00028c0088 ffffea00029aee88 ffff8880aa000e00 [ 64.324560][ T7043] raw: 0000000000000000 ffff8880a3501000 0000000100000001 0000000000000000 [ 64.341771][ T7043] page dumped because: kasan: bad access detected [ 64.352255][ T7043] [ 64.355771][ T7043] Memory state around the buggy address: [ 64.365013][ T7043] ffff8880a3501300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 64.379055][ T7043] ffff8880a3501380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 64.392783][ T7043] >ffff8880a3501400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc [ 64.405818][ T7043] ^ [ 64.416467][ T7043] ffff8880a3501480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 64.427058][ T7043] ffff8880a3501500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 64.436985][ T7043] ================================================================== [ 64.448011][ T7043] Disabling lock debugging due to kernel taint [ 64.457064][ T7043] Kernel panic - not syncing: panic_on_warn set ... [ 64.464820][ T7043] CPU: 1 PID: 7043 Comm: syz-executor324 Tainted: G B 5.7.0-rc1-syzkaller #0 [ 64.476363][ T7043] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.488045][ T7043] Call Trace: [ 64.491836][ T7043] dump_stack+0x188/0x20d [ 64.497501][ T7043] panic+0x2e3/0x75c [ 64.501723][ T7043] ? add_taint.cold+0x16/0x16 [ 64.507644][ T7043] ? preempt_schedule_common+0x5e/0xc0 [ 64.514336][ T7043] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 64.523400][ T7043] ? preempt_schedule_thunk+0x16/0x18 [ 64.530015][ T7043] ? trace_hardirqs_on+0x55/0x220 [ 64.538233][ T7043] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 64.545744][ T7043] end_report+0x4d/0x53 [ 64.551373][ T7043] __kasan_report.cold+0xd/0x4d [ 64.557053][ T7043] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 64.564079][ T7043] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 64.571696][ T7043] kasan_report+0x33/0x50 [ 64.577215][ T7043] __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 64.584455][ T7043] ? __kvm_write_guest_page+0x170/0x170 [ 64.590405][ T7043] kvm_lapic_set_vapic_addr+0x88/0x180 [ 64.596448][ T7043] kvm_arch_vcpu_ioctl+0xf0d/0x2c20 [ 64.603136][ T7043] ? kvm_arch_vcpu_put+0x530/0x530 [ 64.609926][ T7043] ? lock_acquire+0x1f2/0x8f0 [ 64.615546][ T7043] ? kvm_vcpu_ioctl+0x175/0xe60 [ 64.622906][ T7043] ? lock_release+0x800/0x800 [ 64.629393][ T7043] ? find_held_lock+0x2d/0x110 [ 64.635279][ T7043] ? __mutex_lock+0x458/0x13c0 [ 64.640798][ T7043] ? find_held_lock+0x2d/0x110 [ 64.647030][ T7043] ? kvm_vcpu_ioctl+0x175/0xe60 [ 64.653032][ T7043] ? tomoyo_path_number_perm+0x1ee/0x4d0 [ 64.659642][ T7043] ? mutex_trylock+0x2c0/0x2c0 [ 64.665001][ T7043] ? lock_downgrade+0x840/0x840 [ 64.670559][ T7043] ? quarantine_put+0x119/0x1c0 [ 64.677170][ T7043] ? kfree+0x1eb/0x2b0 [ 64.682990][ T7043] ? tomoyo_path_number_perm+0x411/0x4d0 [ 64.691036][ T7043] ? lockdep_hardirqs_on+0x463/0x620 [ 64.699483][ T7043] ? tomoyo_path_number_perm+0x238/0x4d0 [ 64.709712][ T7043] kvm_vcpu_ioctl+0x866/0xe60 [ 64.718480][ T7043] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 64.727664][ T7043] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 64.737179][ T7043] ? do_vfs_ioctl+0x50c/0x12d0 [ 64.743599][ T7043] ? ioctl_file_clone+0x180/0x180 [ 64.750755][ T7043] kvm_vcpu_compat_ioctl+0x1ab/0x350 [ 64.756990][ T7043] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.763577][ T7043] ? kvm_vcpu_ioctl+0xe60/0xe60 [ 64.769648][ T7043] ? do_sys_open+0xc3/0x140 [ 64.775979][ T7043] ? kvm_vcpu_ioctl+0xe60/0xe60 [ 64.782455][ T7043] __ia32_compat_sys_ioctl+0x23d/0x2b0 [ 64.790877][ T7043] do_fast_syscall_32+0x270/0xe90 [ 64.796458][ T7043] entry_SYSENTER_compat+0x70/0x7f [ 64.804939][ T7043] Kernel Offset: disabled [ 64.810166][ T7043] Rebooting in 86400 seconds..