[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.859975] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.501896] random: sshd: uninitialized urandom read (32 bytes read) [ 20.777661] random: sshd: uninitialized urandom read (32 bytes read) [ 21.499161] random: sshd: uninitialized urandom read (32 bytes read) [ 131.501425] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. [ 137.203287] 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 [ 137.371036] kasan: CONFIG_KASAN_INLINE enabled [ 137.375747] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 137.383134] general protection fault: 0000 [#1] SMP KASAN [ 137.388663] Dumping ftrace buffer: [ 137.392179] (ftrace buffer empty) [ 137.395873] Modules linked in: [ 137.399053] CPU: 0 PID: 4525 Comm: syz-executor786 Not tainted 4.17.0-rc2+ #23 [ 137.406387] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 137.415734] RIP: 0010:__radix_tree_delete+0x74/0x230 [ 137.420809] RSP: 0018:ffff8801d9137108 EFLAGS: 00010206 [ 137.426150] RAX: 0000000000000003 RBX: dffffc0000000000 RCX: 1ffff1003b226e3e [ 137.433398] RDX: 0000000000000000 RSI: ffffffff8768eeed RDI: ffff8801a7dac168 [ 137.440645] RBP: ffff8801d91371a8 R08: ffff8801d962c1c0 R09: ffffed0034fb5811 [ 137.447894] R10: ffff8801d91372b8 R11: ffff8801a7dac08f R12: 0000000000000000 [ 137.455151] R13: ffff8801a7dac168 R14: 0000000000000018 R15: ffff8801d9137230 [ 137.462401] FS: 0000000001df3880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 137.470605] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 137.476481] CR2: 0000000020000100 CR3: 00000001d9104000 CR4: 00000000001426f0 [ 137.483735] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 137.490990] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 137.498238] Call Trace: [ 137.500808] ? find_held_lock+0x36/0x1c0 [ 137.504857] ? radix_tree_tag_clear+0x490/0x490 [ 137.509506] ? retint_kernel+0x10/0x10 [ 137.513383] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 137.518910] radix_tree_delete_item+0x148/0x2d0 [ 137.523562] ? radix_tree_lookup+0x30/0x30 [ 137.527776] ? retint_kernel+0x10/0x10 [ 137.531647] ? _copy_from_user+0x100/0x150 [ 137.535863] idr_remove+0x46/0x60 [ 137.539302] kvm_vm_ioctl_hv_eventfd+0x1df/0x24b [ 137.544062] kvm_arch_vm_ioctl+0x155e/0x2690 [ 137.548455] ? kvm_vm_ioctl_irq_line+0x160/0x160 [ 137.553192] ? lock_downgrade+0x8e0/0x8e0 [ 137.557321] ? print_usage_bug+0xc0/0xc0 [ 137.561364] ? kasan_check_read+0x11/0x20 [ 137.565493] ? rcu_is_watching+0x85/0x140 [ 137.569623] ? graph_lock+0x170/0x170 [ 137.573403] ? graph_lock+0x170/0x170 [ 137.577192] ? print_usage_bug+0xc0/0xc0 [ 137.581241] ? find_held_lock+0x36/0x1c0 [ 137.585291] ? print_usage_bug+0xc0/0xc0 [ 137.589332] ? kasan_check_read+0x11/0x20 [ 137.593467] ? rcu_is_watching+0x85/0x140 [ 137.597593] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 137.602773] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 137.607953] ? __lock_acquire+0x7f5/0x5140 [ 137.612184] ? kernel_text_address+0x79/0xf0 [ 137.616577] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 137.621759] kvm_vm_ioctl+0x246/0x1d90 [ 137.625629] ? kvm_set_memory_region+0x50/0x50 [ 137.630205] ? save_stack+0xa9/0xd0 [ 137.633819] ? save_stack+0x43/0xd0 [ 137.637427] ? kasan_kmalloc+0xc4/0xe0 [ 137.641302] ? kasan_slab_alloc+0x12/0x20 [ 137.645430] ? kmem_cache_alloc+0x12e/0x760 [ 137.649730] ? get_empty_filp+0x125/0x520 [ 137.653856] ? alloc_file+0x24/0x3e0 [ 137.657551] ? anon_inode_getfile+0x29a/0x4c0 [ 137.662023] ? anon_inode_getfd+0x52/0xb0 [ 137.666149] ? do_eventfd+0x1c5/0x290 [ 137.669928] ? __x64_sys_eventfd2+0x54/0x80 [ 137.674227] ? do_syscall_64+0x1b1/0x800 [ 137.678268] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 137.683616] ? find_held_lock+0x36/0x1c0 [ 137.687661] ? debug_mutex_init+0x1c/0x60 [ 137.691798] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 137.696794] ? graph_lock+0x170/0x170 [ 137.700574] ? lockdep_init_map+0x9/0x10 [ 137.704616] ? debug_mutex_init+0x2d/0x60 [ 137.708742] ? __mutex_init+0x1ef/0x280 [ 137.712695] ? find_held_lock+0x36/0x1c0 [ 137.716735] ? lock_downgrade+0x8e0/0x8e0 [ 137.720874] ? kasan_check_read+0x11/0x20 [ 137.724999] ? rcu_is_watching+0x85/0x140 [ 137.729124] ? __lock_is_held+0xb5/0x140 [ 137.733164] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 137.738347] ? __fd_install+0x2de/0x880 [ 137.742302] ? get_unused_fd_flags+0x190/0x190 [ 137.746874] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 137.752392] ? alloc_file+0x44/0x3e0 [ 137.756089] ? kvm_set_memory_region+0x50/0x50 [ 137.760648] do_vfs_ioctl+0x1cf/0x16a0 [ 137.764518] ? ioctl_preallocate+0x2e0/0x2e0 [ 137.768906] ? fget_raw+0x20/0x20 [ 137.772339] ? __init_waitqueue_head+0x96/0x140 [ 137.776993] ? anon_inode_getfd+0x81/0xb0 [ 137.781134] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 137.786648] ? do_eventfd+0x1db/0x290 [ 137.790430] ? security_file_ioctl+0x94/0xc0 [ 137.794820] ksys_ioctl+0xa9/0xd0 [ 137.798253] __x64_sys_ioctl+0x73/0xb0 [ 137.802119] do_syscall_64+0x1b1/0x800 [ 137.805986] ? syscall_return_slowpath+0x5c0/0x5c0 [ 137.810894] ? syscall_return_slowpath+0x30f/0x5c0 [ 137.815816] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 137.821159] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 137.825979] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 137.831146] RIP: 0033:0x440069 [ 137.834313] RSP: 002b:00007ffcf0b02cd8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 137.842007] RAX: ffffffffffffffda RBX: 6d766b2f7665642f RCX: 0000000000440069 [ 137.849254] RDX: 0000000020000000 RSI: 000000004018aebd RDI: 00000000000000a9 [ 137.856502] RBP: 00000000006cb018 R08: 00007ffcf0b02cf0 R09: 00007ffcf0b02cf0 [ 137.863751] R10: 00007ffcf0b02cf0 R11: 0000000000000217 R12: 00000000004018a0 [ 137.870997] R13: 0000000000401930 R14: 0000000000000000 R15: 0000000000000000 [ 137.878244] Code: 3f 9a 88 48 c7 45 88 80 ee 68 87 c7 00 f1 f1 f1 f1 c7 40 04 00 f2 f2 f2 c7 40 08 f3 f3 f3 f3 e8 a3 51 10 fa 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 0f 85 97 01 00 00 48 8d 55 d8 4c 8d 7a c0 49 8b 1e [ 137.897374] RIP: __radix_tree_delete+0x74/0x230 RSP: ffff8801d9137108 [ 137.904026] ---[ end trace 79327005f044daef ]--- [ 137.908782] Kernel panic - not syncing: Fatal exception [ 137.914510] Dumping ftrace buffer: [ 137.918031] (ftrace buffer empty) [ 137.921721] Kernel Offset: disabled [ 137.925328] Rebooting in 86400 seconds..