[ 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 '10.128.10.60' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 56.613848][ T7017] 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. [ 56.649233][ T7017] ================================================================== [ 56.657439][ T7017] BUG: KASAN: slab-out-of-bounds in __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 56.666175][ T7017] Read of size 8 at addr ffff8880a65ec468 by task syz-executor265/7017 [ 56.674394][ T7017] [ 56.676714][ T7017] CPU: 1 PID: 7017 Comm: syz-executor265 Not tainted 5.6.0-syzkaller #0 [ 56.685236][ T7017] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.695395][ T7017] Call Trace: [ 56.698673][ T7017] dump_stack+0x188/0x20d [ 56.702987][ T7017] print_address_description.constprop.0.cold+0xd3/0x315 [ 56.709995][ T7017] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 56.715959][ T7017] __kasan_report.cold+0x35/0x4d [ 56.720923][ T7017] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 56.726911][ T7017] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 56.732868][ T7017] kasan_report+0x33/0x50 [ 56.737190][ T7017] __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 56.743041][ T7017] ? __kvm_write_guest_page+0x170/0x170 [ 56.748675][ T7017] kvm_lapic_set_vapic_addr+0x88/0x180 [ 56.754303][ T7017] kvm_arch_vcpu_ioctl+0xf0d/0x2c20 [ 56.759491][ T7017] ? kvm_arch_vcpu_put+0x530/0x530 [ 56.764587][ T7017] ? lock_acquire+0x1f2/0x8f0 [ 56.769257][ T7017] ? kvm_vcpu_ioctl+0x175/0xe60 [ 56.774087][ T7017] ? lock_release+0x800/0x800 [ 56.778775][ T7017] ? find_held_lock+0x2d/0x110 [ 56.783523][ T7017] ? __mutex_lock+0x458/0x13c0 [ 56.789238][ T7017] ? find_held_lock+0x2d/0x110 [ 56.793994][ T7017] ? kvm_vcpu_ioctl+0x175/0xe60 [ 56.798828][ T7017] ? tomoyo_path_number_perm+0x1ee/0x4d0 [ 56.804443][ T7017] ? mutex_trylock+0x2c0/0x2c0 [ 56.809186][ T7017] ? lock_downgrade+0x840/0x840 [ 56.814035][ T7017] ? quarantine_put+0x119/0x1c0 [ 56.818913][ T7017] ? kfree+0x1eb/0x2b0 [ 56.822980][ T7017] ? tomoyo_path_number_perm+0x411/0x4d0 [ 56.828598][ T7017] ? lockdep_hardirqs_on+0x463/0x620 [ 56.833990][ T7017] ? tomoyo_path_number_perm+0x238/0x4d0 [ 56.839615][ T7017] kvm_vcpu_ioctl+0x866/0xe60 [ 56.844328][ T7017] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 56.850784][ T7017] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 56.856666][ T7017] ? do_vfs_ioctl+0x50c/0x12d0 [ 56.861422][ T7017] ? ioctl_file_clone+0x180/0x180 [ 56.866449][ T7017] kvm_vcpu_compat_ioctl+0x1ab/0x350 [ 56.871716][ T7017] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 56.877677][ T7017] ? kvm_vcpu_ioctl+0xe60/0xe60 [ 56.882522][ T7017] ? do_sys_open+0xc3/0x140 [ 56.887008][ T7017] ? kvm_vcpu_ioctl+0xe60/0xe60 [ 56.891854][ T7017] __ia32_compat_sys_ioctl+0x23d/0x2b0 [ 56.897853][ T7017] do_fast_syscall_32+0x270/0xe90 [ 56.902870][ T7017] entry_SYSENTER_compat+0x70/0x7f [ 56.908080][ T7017] [ 56.910406][ T7017] Allocated by task 7017: [ 56.914720][ T7017] save_stack+0x1b/0x40 [ 56.918859][ T7017] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 56.924473][ T7017] kvmalloc_node+0x61/0xf0 [ 56.928869][ T7017] kvm_set_memslot+0x115/0x1530 [ 56.933696][ T7017] __kvm_set_memory_region+0xcf7/0x1320 [ 56.939223][ T7017] __x86_set_memory_region+0x2a3/0x5a0 [ 56.944661][ T7017] vmx_create_vcpu+0x2107/0x2b40 [ 56.949575][ T7017] kvm_arch_vcpu_create+0x6ef/0xb80 [ 56.954759][ T7017] kvm_vm_ioctl+0x15f7/0x23e0 [ 56.959441][ T7017] kvm_vm_compat_ioctl+0x125/0x240 [ 56.964533][ T7017] __ia32_compat_sys_ioctl+0x23d/0x2b0 [ 56.969969][ T7017] do_fast_syscall_32+0x270/0xe90 [ 56.974973][ T7017] entry_SYSENTER_compat+0x70/0x7f [ 56.980679][ T7017] [ 56.983006][ T7017] Freed by task 4114: [ 56.986966][ T7017] save_stack+0x1b/0x40 [ 56.991098][ T7017] __kasan_slab_free+0xf7/0x140 [ 56.995990][ T7017] kfree+0x109/0x2b0 [ 56.999919][ T7017] __scm_destroy+0xf1/0x130 [ 57.004423][ T7017] unix_dgram_sendmsg+0xd70/0x12e0 [ 57.009650][ T7017] sock_sendmsg+0xcf/0x120 [ 57.014053][ T7017] ____sys_sendmsg+0x6bf/0x7e0 [ 57.018809][ T7017] ___sys_sendmsg+0x100/0x170 [ 57.023485][ T7017] __sys_sendmsg+0xec/0x1b0 [ 57.027990][ T7017] do_syscall_64+0xf6/0x7d0 [ 57.032474][ T7017] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 57.038354][ T7017] [ 57.040680][ T7017] The buggy address belongs to the object at ffff8880a65ec000 [ 57.040680][ T7017] which belongs to the cache kmalloc-2k of size 2048 [ 57.054711][ T7017] The buggy address is located 1128 bytes inside of [ 57.054711][ T7017] 2048-byte region [ffff8880a65ec000, ffff8880a65ec800) [ 57.068129][ T7017] The buggy address belongs to the page: [ 57.073756][ T7017] page:ffffea0002997b00 refcount:1 mapcount:0 mapping:0000000044548fd5 index:0x0 [ 57.082840][ T7017] flags: 0xfffe0000000200(slab) [ 57.087678][ T7017] raw: 00fffe0000000200 ffffea0002997ac8 ffffea0002997b48 ffff8880aa000e00 [ 57.096257][ T7017] raw: 0000000000000000 ffff8880a65ec000 0000000100000001 0000000000000000 [ 57.104848][ T7017] page dumped because: kasan: bad access detected [ 57.111247][ T7017] [ 57.113568][ T7017] Memory state around the buggy address: [ 57.119182][ T7017] ffff8880a65ec300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 57.127224][ T7017] ffff8880a65ec380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 57.135313][ T7017] >ffff8880a65ec400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc [ 57.143460][ T7017] ^ [ 57.150899][ T7017] ffff8880a65ec480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 57.158943][ T7017] ffff8880a65ec500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 57.166989][ T7017] ================================================================== [ 57.175042][ T7017] Disabling lock debugging due to kernel taint [ 57.183794][ T7017] Kernel panic - not syncing: panic_on_warn set ... [ 57.190401][ T7017] CPU: 0 PID: 7017 Comm: syz-executor265 Tainted: G B 5.6.0-syzkaller #0 [ 57.201243][ T7017] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.211292][ T7017] Call Trace: [ 57.214582][ T7017] dump_stack+0x188/0x20d [ 57.218892][ T7017] panic+0x2e3/0x75c [ 57.222824][ T7017] ? add_taint.cold+0x16/0x16 [ 57.227492][ T7017] ? preempt_schedule_common+0x5e/0xc0 [ 57.232941][ T7017] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 57.238906][ T7017] ? preempt_schedule_thunk+0x16/0x18 [ 57.244257][ T7017] ? trace_hardirqs_on+0x55/0x220 [ 57.249279][ T7017] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 57.255237][ T7017] end_report+0x4d/0x53 [ 57.259370][ T7017] __kasan_report.cold+0xd/0x4d [ 57.265065][ T7017] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 57.271089][ T7017] ? __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 57.277097][ T7017] kasan_report+0x33/0x50 [ 57.281416][ T7017] __kvm_gfn_to_hva_cache_init+0x5fb/0x670 [ 57.287215][ T7017] ? __kvm_write_guest_page+0x170/0x170 [ 57.293191][ T7017] kvm_lapic_set_vapic_addr+0x88/0x180 [ 57.298820][ T7017] kvm_arch_vcpu_ioctl+0xf0d/0x2c20 [ 57.304023][ T7017] ? kvm_arch_vcpu_put+0x530/0x530 [ 57.309139][ T7017] ? lock_acquire+0x1f2/0x8f0 [ 57.313804][ T7017] ? kvm_vcpu_ioctl+0x175/0xe60 [ 57.318643][ T7017] ? lock_release+0x800/0x800 [ 57.323298][ T7017] ? find_held_lock+0x2d/0x110 [ 57.328043][ T7017] ? __mutex_lock+0x458/0x13c0 [ 57.332783][ T7017] ? find_held_lock+0x2d/0x110 [ 57.337816][ T7017] ? kvm_vcpu_ioctl+0x175/0xe60 [ 57.342734][ T7017] ? tomoyo_path_number_perm+0x1ee/0x4d0 [ 57.348787][ T7017] ? mutex_trylock+0x2c0/0x2c0 [ 57.353532][ T7017] ? lock_downgrade+0x840/0x840 [ 57.358495][ T7017] ? quarantine_put+0x119/0x1c0 [ 57.363326][ T7017] ? kfree+0x1eb/0x2b0 [ 57.367381][ T7017] ? tomoyo_path_number_perm+0x411/0x4d0 [ 57.372990][ T7017] ? lockdep_hardirqs_on+0x463/0x620 [ 57.378274][ T7017] ? tomoyo_path_number_perm+0x238/0x4d0 [ 57.383890][ T7017] kvm_vcpu_ioctl+0x866/0xe60 [ 57.388547][ T7017] ? kvm_get_dirty_log_protect.isra.0+0x670/0x670 [ 57.394955][ T7017] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 57.400828][ T7017] ? do_vfs_ioctl+0x50c/0x12d0 [ 57.405570][ T7017] ? ioctl_file_clone+0x180/0x180 [ 57.410571][ T7017] kvm_vcpu_compat_ioctl+0x1ab/0x350 [ 57.415849][ T7017] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 57.421802][ T7017] ? kvm_vcpu_ioctl+0xe60/0xe60 [ 57.426643][ T7017] ? do_sys_open+0xc3/0x140 [ 57.431138][ T7017] ? kvm_vcpu_ioctl+0xe60/0xe60 [ 57.435976][ T7017] __ia32_compat_sys_ioctl+0x23d/0x2b0 [ 57.441457][ T7017] do_fast_syscall_32+0x270/0xe90 [ 57.447225][ T7017] entry_SYSENTER_compat+0x70/0x7f [ 57.453764][ T7017] Kernel Offset: disabled [ 57.458153][ T7017] Rebooting in 86400 seconds..