[ 16.167309] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.774455] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.118516] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.014954] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) [ 33.978320] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) Warning: Permanently added '10.128.15.234' (ECDSA) to the list of known hosts. [ 39.369333] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program [ 39.517096] ================================================================== [ 39.524470] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 39.531449] Read of size 8 at addr ffff8801d163d1c0 by task syzkaller318601/3322 [ 39.538945] [ 39.540543] CPU: 1 PID: 3322 Comm: syzkaller318601 Not tainted 4.4.113-ge70c132 #34 [ 39.548301] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.557619] 0000000000000000 76ac4276f80f9045 ffff8801d0fd79f0 ffffffff81d0278d [ 39.565578] ffffea0007458f40 ffff8801d163d1c0 0000000000000000 ffff8801d163d1c0 [ 39.573540] ffff8801d332c438 ffff8801d0fd7a28 ffffffff814fd053 ffff8801d163d1c0 [ 39.581503] Call Trace: [ 39.584059] [] dump_stack+0xc1/0x124 [ 39.589391] [] print_address_description+0x73/0x260 [ 39.596025] [] kasan_report+0x285/0x370 [ 39.601616] [] ? sg_remove_request+0xf9/0x110 [ 39.607729] [] __asan_report_load8_noabort+0x14/0x20 [ 39.614447] [] sg_remove_request+0xf9/0x110 [ 39.620386] [] sg_finish_rem_req+0x295/0x340 [ 39.626411] [] sg_read+0xa1b/0x1490 [ 39.631656] [] ? __check_object_size+0x154/0x35b [ 39.638034] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 39.644667] [] ? fsnotify+0xee0/0xee0 [ 39.650085] [] ? avc_policy_seqno+0x9/0x20 [ 39.655937] [] do_loop_readv_writev+0x141/0x1e0 [ 39.662220] [] ? security_file_permission+0x89/0x1e0 [ 39.668939] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 39.675574] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 39.682206] [] do_readv_writev+0x5dd/0x6e0 [ 39.688055] [] ? vfs_write+0x530/0x530 [ 39.693560] [] ? _raw_spin_unlock+0x2c/0x50 [ 39.699496] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 39.706478] [] ? __fget+0x232/0x3b0 [ 39.711720] [] ? __fget+0x47/0x3b0 [ 39.716876] [] vfs_readv+0x78/0xb0 [ 39.722029] [] SyS_readv+0xd9/0x240 [ 39.727269] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 39.733816] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 39.740358] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 39.746899] [ 39.748494] Allocated by task 0: [ 39.751825] (stack is not available) [ 39.755504] [ 39.757097] Freed by task 0: [ 39.760078] (stack is not available) [ 39.763755] [ 39.765350] The buggy address belongs to the object at ffff8801d163d180 [ 39.765350] which belongs to the cache fasync_cache of size 96 [ 39.777980] The buggy address is located 64 bytes inside of [ 39.777980] 96-byte region [ffff8801d163d180, ffff8801d163d1e0) [ 39.789647] The buggy address belongs to the page: [ 39.796564] kasan: CONFIG_KASAN_INLINE enabled [ 39.800966] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 39.813785] Dumping ftrace buffer: [ 39.817292] (ftrace buffer empty) [ 39.820972] Modules linked in: [ 39.824250] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.113-ge70c132 #34 [ 39.831228] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.840563] task: ffffffff84217840 task.stack: ffffffff84200000 [ 39.846584] RIP: 0010:[] [] rb_insert_color+0x9f/0xcb0 [ 39.855334] RSP: 0018:ffff8801db207d18 EFLAGS: 00010003 [ 39.860749] RAX: 0a0508a8e82a0be9 RBX: ffffffff838a8de0 RCX: ffffffff838a8de0 [ 39.867998] RDX: 1ffffffff07151bd RSI: ffff8801db219710 RDI: ffff8801db219c40 [ 39.875235] RBP: ffff8801db207d60 R08: ffffffff8580af08 R09: 0000000000000001 [ 39.882471] R10: 0000000000000000 R11: 1ffff1003b640f62 R12: ffff8801d0607df8 [ 39.889706] R13: 5028454741505f4e R14: ffff8801db219c40 R15: dffffc0000000000 [ 39.896945] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 39.905139] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.911001] CR2: 00000000201da000 CR3: 00000000b52ea000 CR4: 0000000000160670 [ 39.918250] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.925486] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.932723] Stack: [ 39.934839] ffffffff842bdb20 ffffffff842180b0 0000000000000000 ffff8801db207d70 [ 39.942799] ffff8801db219c40 dffffc0000000000 0000000000000000 ffff8801db219710 [ 39.950755] ffff8801d0607e00 ffff8801db207db0 ffffffff81d20067 ffff8801db219c58 [ 39.958717] Call Trace: [ 39.961265] [ 39.963299] [] timerqueue_add+0x157/0x2a0 [ 39.969356] [] enqueue_hrtimer+0x168/0x450 [ 39.975208] [] __hrtimer_run_queues+0x732/0xfe0 [ 39.981491] [] ? hrtimer_fixup_init+0x70/0x70 [ 39.987601] [] ? hrtimer_interrupt+0x131/0x440 [ 39.993817] [] hrtimer_interrupt+0x1a6/0x440 [ 39.999843] [] local_apic_timer_interrupt+0x6a/0xb0 [ 40.006478] [] smp_apic_timer_interrupt+0x76/0xa0 [ 40.013633] [] apic_timer_interrupt+0xa0/0xb0 [ 40.019742] [ 40.021774] [] ? native_safe_halt+0x6/0x10 [ 40.027920] [] default_idle+0x55/0x3c0 [ 40.033425] [] arch_cpu_idle+0xa/0x10 [ 40.038841] [] default_idle_call+0x48/0x70 [ 40.044700] [] cpu_startup_entry+0x5fd/0x8f0 [ 40.050732] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 40.057623] [] ? call_cpuidle+0xe0/0xe0 [ 40.063212] [] rest_init+0x189/0x190 [ 40.068544] [] start_kernel+0x6b9/0x6ee [ 40.074135] [] ? thread_stack_cache_init+0xb/0xb [ 40.080508] [] ? early_idt_handler_array+0x120/0x120 [ 40.087225] [] ? early_idt_handler_array+0x120/0x120 [ 40.093943] [] x86_64_start_reservations+0x2a/0x2c [ 40.100486] [] x86_64_start_kernel+0x140/0x163 [ 40.106679] Code: 48 89 c2 48 c1 ea 03 42 80 3c 3a 00 0f 85 94 09 00 00 4c 8b 6b 08 4d 39 e5 0f 84 b0 01 00 00 4d 85 ed 74 1d 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 95 09 00 00 41 f6 45 00 01 0f 84 20 03 00 [ 40.133184] RIP [] rb_insert_color+0x9f/0xcb0 [ 40.139413] RSP [ 40.143010] ---[ end trace d68ca330bdbf826d ]--- [ 40.147732] Kernel panic - not syncing: Fatal exception in interrupt [ 41.224757] Shutting down cpus with NMI [ 41.229115] Dumping ftrace buffer: [ 41.232624] (ftrace buffer empty) [ 41.236299] Kernel Offset: disabled [ 41.239892] Rebooting in 86400 seconds..