[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.905705] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.392926] random: sshd: uninitialized urandom read (32 bytes read) [ 20.619187] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.346440] random: sshd: uninitialized urandom read (32 bytes read) [ 21.504128] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. [ 26.981628] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.031040] ------------[ cut here ]------------ [ 28.035869] DEBUG_LOCKS_WARN_ON(__owner_task(owner) != current) [ 28.035946] WARNING: CPU: 0 PID: 4525 at kernel/locking/mutex.c:1032 __mutex_unlock_slowpath+0x62e/0x8a0 [ 28.051608] Kernel panic - not syncing: panic_on_warn set ... [ 28.051608] [ 28.058977] CPU: 0 PID: 4525 Comm: syz-executor809 Not tainted 4.17.0-rc2+ #22 [ 28.066334] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.075687] Call Trace: [ 28.078292] dump_stack+0x1b9/0x294 [ 28.081932] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.087133] ? __mutex_unlock_slowpath+0x5b0/0x8a0 [ 28.092069] panic+0x22f/0x4de [ 28.095266] ? add_taint.cold.5+0x16/0x16 [ 28.099518] ? __warn.cold.8+0x148/0x1b3 [ 28.103607] ? __warn.cold.8+0x117/0x1b3 [ 28.107673] ? __mutex_unlock_slowpath+0x62e/0x8a0 [ 28.112872] __warn.cold.8+0x163/0x1b3 [ 28.116764] ? __mutex_unlock_slowpath+0x62e/0x8a0 [ 28.121957] report_bug+0x252/0x2d0 [ 28.125603] do_error_trap+0x1de/0x490 [ 28.129518] ? mutex_trylock+0x2a0/0x2a0 [ 28.133609] ? math_error+0x420/0x420 [ 28.137414] ? vprintk_default+0x28/0x30 [ 28.141572] ? vprintk_func+0x81/0xe7 [ 28.145376] ? printk+0x9e/0xba [ 28.148662] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.153508] do_invalid_op+0x1b/0x20 [ 28.157224] invalid_op+0x14/0x20 [ 28.160680] RIP: 0010:__mutex_unlock_slowpath+0x62e/0x8a0 [ 28.166215] RSP: 0018:ffff8801cf31f138 EFLAGS: 00010286 [ 28.171588] RAX: 0000000000000033 RBX: 1ffff10039e63e30 RCX: ffffffff8160b82d [ 28.178946] RDX: 0000000000000000 RSI: ffffffff816104e1 RDI: 0000000000000001 [ 28.186219] RBP: ffff8801cf31f2a8 R08: ffff8801d9042180 R09: fffffbfff11b0974 [ 28.193495] R10: fffffbfff11b0974 R11: ffffffff88d84ba3 R12: ffffffff8a713a20 [ 28.200767] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8801989d6b08 [ 28.208055] ? console_unlock+0x8ad/0x1100 [ 28.212307] ? vprintk_func+0x81/0xe7 [ 28.216116] ? __mutex_unlock_slowpath+0x62e/0x8a0 [ 28.221057] ? wait_for_completion+0x870/0x870 [ 28.225658] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.231204] ? radix_tree_delete_item+0x14d/0x2d0 [ 28.236060] ? radix_tree_lookup+0x30/0x30 [ 28.240297] ? retint_kernel+0x10/0x10 [ 28.244197] ? kvm_vm_ioctl_hv_eventfd+0x1d0/0x24b [ 28.249135] mutex_unlock+0xd/0x10 [ 28.252676] kvm_vm_ioctl_hv_eventfd+0x1ea/0x24b [ 28.257441] kvm_arch_vm_ioctl+0x155e/0x2690 [ 28.261858] ? kvm_vm_ioctl_irq_line+0x160/0x160 [ 28.266617] ? lock_downgrade+0x8e0/0x8e0 [ 28.270769] ? print_usage_bug+0xc0/0xc0 [ 28.274846] ? kasan_check_read+0x11/0x20 [ 28.278996] ? rcu_is_watching+0x85/0x140 [ 28.283146] ? graph_lock+0x170/0x170 [ 28.286952] ? graph_lock+0x170/0x170 [ 28.290755] ? print_usage_bug+0xc0/0xc0 [ 28.294820] ? find_held_lock+0x36/0x1c0 [ 28.298888] ? print_usage_bug+0xc0/0xc0 [ 28.302957] ? kasan_check_read+0x11/0x20 [ 28.307109] ? rcu_is_watching+0x85/0x140 [ 28.311265] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 28.316460] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 28.321842] ? __lock_acquire+0x7f5/0x5140 [ 28.326086] ? kernel_text_address+0x79/0xf0 [ 28.330500] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 28.335783] kvm_vm_ioctl+0x246/0x1d90 [ 28.339678] ? kvm_set_memory_region+0x50/0x50 [ 28.344267] ? save_stack+0xa9/0xd0 [ 28.347894] ? save_stack+0x43/0xd0 [ 28.351518] ? kasan_kmalloc+0xc4/0xe0 [ 28.355409] ? kasan_slab_alloc+0x12/0x20 [ 28.359562] ? kmem_cache_alloc+0x12e/0x760 [ 28.363886] ? get_empty_filp+0x125/0x520 [ 28.368035] ? alloc_file+0x24/0x3e0 [ 28.371751] ? anon_inode_getfile+0x29a/0x4c0 [ 28.376250] ? anon_inode_getfd+0x52/0xb0 [ 28.380403] ? do_eventfd+0x1c5/0x290 [ 28.384209] ? __x64_sys_eventfd2+0x54/0x80 [ 28.388549] ? do_syscall_64+0x1b1/0x800 [ 28.392619] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.397992] ? find_held_lock+0x36/0x1c0 [ 28.402056] ? debug_mutex_init+0x1c/0x60 [ 28.406210] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.411228] ? graph_lock+0x170/0x170 [ 28.415036] ? lockdep_init_map+0x9/0x10 [ 28.419105] ? debug_mutex_init+0x2d/0x60 [ 28.423261] ? __mutex_init+0x1ef/0x280 [ 28.427244] ? find_held_lock+0x36/0x1c0 [ 28.431313] ? lock_downgrade+0x8e0/0x8e0 [ 28.435475] ? kasan_check_read+0x11/0x20 [ 28.439635] ? rcu_is_watching+0x85/0x140 [ 28.443959] ? __lock_is_held+0xb5/0x140 [ 28.448033] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 28.453233] ? __fd_install+0x2de/0x880 [ 28.458964] ? get_unused_fd_flags+0x190/0x190 [ 28.463579] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.469124] ? alloc_file+0x44/0x3e0 [ 28.472845] ? kvm_set_memory_region+0x50/0x50 [ 28.477430] do_vfs_ioctl+0x1cf/0x16a0 [ 28.481330] ? ioctl_preallocate+0x2e0/0x2e0 [ 28.485761] ? fget_raw+0x20/0x20 [ 28.489218] ? __init_waitqueue_head+0x96/0x140 [ 28.493893] ? anon_inode_getfd+0x81/0xb0 [ 28.498051] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.503597] ? do_eventfd+0x1db/0x290 [ 28.507672] ? security_file_ioctl+0x94/0xc0 [ 28.512177] ksys_ioctl+0xa9/0xd0 [ 28.515646] __x64_sys_ioctl+0x73/0xb0 [ 28.519551] do_syscall_64+0x1b1/0x800 [ 28.523443] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.528382] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.533325] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.538700] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.543561] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.548756] RIP: 0033:0x4401f9 [ 28.551943] RSP: 002b:00007ffcd5727a48 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 28.559658] RAX: ffffffffffffffda RBX: 6d766b2f7665642f RCX: 00000000004401f9 [ 28.566932] RDX: 0000000020000140 RSI: 000000004018aebd RDI: 00000000000000ee [ 28.574205] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 28.581475] R10: 00000000004002c8 R11: 0000000000000217 R12: 0000000000401720 [ 28.588751] R13: 00000000004017b0 R14: 0000000000000000 R15: 0000000000000000 [ 28.596640] Dumping ftrace buffer: [ 28.601001] (ftrace buffer empty) [ 28.604691] Kernel Offset: disabled [ 28.608304] Rebooting in 86400 seconds..