[ 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 '10.128.1.8' (ECDSA) to the list of known hosts. syzkaller login: [ 41.301550][ T7218] IPVS: ftp: loaded support on port[0] = 21 [ 41.301555][ T7221] IPVS: ftp: loaded support on port[0] = 21 [ 41.316393][ T7215] IPVS: ftp: loaded support on port[0] = 21 [ 41.321294][ T7223] IPVS: ftp: loaded support on port[0] = 21 [ 41.331460][ T7220] IPVS: ftp: loaded support on port[0] = 21 [ 41.343270][ T7222] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program [ 41.454494][ T7311] 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. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.442852][ T9960] ================================================================== [ 47.451555][ T9960] BUG: KASAN: slab-out-of-bounds in gfn_to_memslot+0x275/0x470 [ 47.459097][ T9960] Read of size 8 at addr ffff888097b31468 by task syz-executor165/9960 [ 47.467327][ T9960] [ 47.469653][ T9960] CPU: 0 PID: 9960 Comm: syz-executor165 Not tainted 5.6.0-syzkaller #0 [ 47.477968][ T9960] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.488027][ T9960] Call Trace: [ 47.491309][ T9960] dump_stack+0x1e9/0x30e [ 47.495634][ T9960] print_address_description+0x74/0x5c0 [ 47.501159][ T9960] ? vprintk_emit+0x342/0x3c0 [ 47.505816][ T9960] ? printk+0x62/0x83 [ 47.509793][ T9960] ? trace_irq_disable_rcuidle+0x1f/0x1d0 [ 47.515765][ T9960] __kasan_report+0x103/0x1a0 [ 47.520419][ T9960] ? gfn_to_memslot+0x275/0x470 [ 47.525245][ T9960] ? gfn_to_memslot+0x275/0x470 [ 47.530071][ T9960] kasan_report+0x4d/0x80 [ 47.534468][ T9960] ? gfn_to_memslot+0x275/0x470 [ 47.539320][ T9960] ? gfn_to_hva+0x1d/0x120 [ 47.543715][ T9960] ? kvm_arch_mmu_notifier_invalidate_range+0x22/0x70 [ 47.550455][ T9960] ? kvm_mmu_notifier_invalidate_range_start+0x299/0x320 [ 47.557491][ T9960] ? __mmu_notifier_invalidate_range_start+0x46b/0x750 [ 47.564346][ T9960] ? mmu_notifier_invalidate_range_start+0xb3/0xf0 [ 47.570850][ T9960] ? change_protection+0x7f9/0x20f0 [ 47.576034][ T9960] ? __vma_adjust+0x21d2/0x22a0 [ 47.580878][ T9960] ? __vma_adjust+0xb31/0x22a0 [ 47.585648][ T9960] ? mprotect_fixup+0x714/0x800 [ 47.590489][ T9960] ? do_mprotect_pkey+0x6ab/0x900 [ 47.595497][ T9960] ? __x64_sys_mprotect+0x7c/0x90 [ 47.600501][ T9960] ? do_syscall_64+0xf3/0x1b0 [ 47.605164][ T9960] ? entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 47.611211][ T9960] [ 47.613895][ T9960] Allocated by task 9966: [ 47.618206][ T9960] __kasan_kmalloc+0x114/0x160 [ 47.622946][ T9960] kvmalloc_node+0x81/0x100 [ 47.627436][ T9960] kvm_set_memslot+0x124/0x15b0 [ 47.633220][ T9960] __kvm_set_memory_region+0x1388/0x16c0 [ 47.639030][ T9960] kvm_vm_ioctl+0x930/0x2530 [ 47.643617][ T9960] __se_sys_ioctl+0xf9/0x160 [ 47.648209][ T9960] do_syscall_64+0xf3/0x1b0 [ 47.652697][ T9960] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 47.658574][ T9960] [ 47.660895][ T9960] Freed by task 8700: [ 47.664874][ T9960] __kasan_slab_free+0x125/0x190 [ 47.669792][ T9960] kfree+0x10a/0x220 [ 47.673676][ T9960] kvm_put_kvm+0xa8d/0xcb0 [ 47.678067][ T9960] kvm_vm_release+0x42/0x50 [ 47.682546][ T9960] __fput+0x2ed/0x750 [ 47.686515][ T9960] task_work_run+0x147/0x1d0 [ 47.691168][ T9960] prepare_exit_to_usermode+0x48e/0x600 [ 47.696689][ T9960] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 47.702561][ T9960] [ 47.704868][ T9960] The buggy address belongs to the object at ffff888097b31000 [ 47.704868][ T9960] which belongs to the cache kmalloc-2k of size 2048 [ 47.718897][ T9960] The buggy address is located 1128 bytes inside of [ 47.718897][ T9960] 2048-byte region [ffff888097b31000, ffff888097b31800) [ 47.732314][ T9960] The buggy address belongs to the page: [ 47.737925][ T9960] page:ffffea00025ecc40 refcount:1 mapcount:0 mapping:00000000499db978 index:0x0 [ 47.747003][ T9960] flags: 0xfffe0000000200(slab) [ 47.751832][ T9960] raw: 00fffe0000000200 ffffea00029ef288 ffffea0002a34408 ffff8880aa400e00 [ 47.760402][ T9960] raw: 0000000000000000 ffff888097b31000 0000000100000001 0000000000000000 [ 47.768984][ T9960] page dumped because: kasan: bad access detected [ 47.775383][ T9960] [ 47.777704][ T9960] Memory state around the buggy address: [ 47.783327][ T9960] ffff888097b31300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 47.791388][ T9960] ffff888097b31380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 47.799523][ T9960] >ffff888097b31400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc [ 47.807561][ T9960] ^ [ 47.814990][ T9960] ffff888097b31480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 47.823027][ T9960] ffff888097b31500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 47.831067][ T9960] ================================================================== [ 47.839108][ T9960] Disabling lock debugging due to kernel taint [ 47.847909][ T9960] Kernel panic - not syncing: panic_on_warn set ... [ 47.854516][ T9960] CPU: 0 PID: 9960 Comm: syz-executor165 Tainted: G B 5.6.0-syzkaller #0 [ 47.864215][ T9960] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.874252][ T9960] Call Trace: [ 47.877522][ T9960] dump_stack+0x1e9/0x30e [ 47.881835][ T9960] panic+0x264/0x7a0 [ 47.885706][ T9960] ? trace_hardirqs_on+0x30/0x70 [ 47.890623][ T9960] __kasan_report+0x191/0x1a0 [ 47.895273][ T9960] ? gfn_to_memslot+0x275/0x470 [ 47.900096][ T9960] ? gfn_to_memslot+0x275/0x470 [ 47.904930][ T9960] kasan_report+0x4d/0x80 [ 47.909242][ T9960] ? gfn_to_memslot+0x275/0x470 [ 47.914067][ T9960] ? gfn_to_hva+0x1d/0x120 [ 47.918460][ T9960] ? kvm_arch_mmu_notifier_invalidate_range+0x22/0x70 [ 47.925196][ T9960] ? kvm_mmu_notifier_invalidate_range_start+0x299/0x320 [ 47.932193][ T9960] ? __mmu_notifier_invalidate_range_start+0x46b/0x750 [ 47.939013][ T9960] ? mmu_notifier_invalidate_range_start+0xb3/0xf0 [ 47.945496][ T9960] ? change_protection+0x7f9/0x20f0 [ 47.950668][ T9960] ? __vma_adjust+0x21d2/0x22a0 [ 47.955502][ T9960] ? __vma_adjust+0xb31/0x22a0 [ 47.960256][ T9960] ? mprotect_fixup+0x714/0x800 [ 47.965082][ T9960] ? do_mprotect_pkey+0x6ab/0x900 [ 47.970093][ T9960] ? __x64_sys_mprotect+0x7c/0x90 [ 47.975097][ T9960] ? do_syscall_64+0xf3/0x1b0 [ 47.979749][ T9960] ? entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 47.987035][ T9960] Kernel Offset: disabled [ 47.991355][ T9960] Rebooting in 86400 seconds..