[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.864024] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.858195] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.350564] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 23.219210] random: sshd: uninitialized urandom read (32 bytes read, 102 bits of entropy available) [ 23.397458] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) Warning: Permanently added '10.128.0.5' (ECDSA) to the list of known hosts. [ 28.780706] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) executing program [ 28.884586] ================================================================== [ 28.891972] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.898952] Read of size 8 at addr ffff8800b51a2140 by task syzkaller199600/3322 [ 28.906450] [ 28.908057] CPU: 1 PID: 3322 Comm: syzkaller199600 Not tainted 4.4.111-gc2f631b #20 [ 28.915823] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.925150] 0000000000000000 099e53c239132041 ffff8800b4187970 ffffffff81d0513d [ 28.933102] ffffea0002d46880 ffff8800b51a2140 0000000000000000 ffff8800b51a2140 [ 28.941043] ffff8801d10c2338 ffff8800b41879a8 ffffffff814fd433 ffff8800b51a2140 [ 28.948984] Call Trace: [ 28.951541] [] dump_stack+0xc1/0x124 [ 28.956870] [] print_address_description+0x73/0x260 [ 28.963504] [] kasan_report+0x285/0x370 [ 28.969094] [] ? sg_remove_request+0xf9/0x110 [ 28.975203] [] __asan_report_load8_noabort+0x14/0x20 [ 28.981920] [] sg_remove_request+0xf9/0x110 [ 28.987854] [] sg_finish_rem_req+0x295/0x340 [ 28.993875] [] sg_read+0xa21/0x1490 [ 28.999117] [] ? _raw_spin_unlock+0x2c/0x50 [ 29.005065] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.011701] [] ? fsnotify+0xee0/0xee0 [ 29.017143] [] ? avc_policy_seqno+0x9/0x20 [ 29.023001] [] do_loop_readv_writev+0x141/0x1e0 [ 29.029286] [] ? security_file_permission+0x89/0x1e0 [ 29.036005] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.042635] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 29.049266] [] compat_do_readv_writev+0x5df/0x6e0 [ 29.055731] [] ? vfs_writev+0xb0/0xb0 [ 29.061148] [] ? _raw_spin_unlock+0x2c/0x50 [ 29.067085] [] ? handle_mm_fault+0x3f2/0x3190 [ 29.073194] [] ? putname+0xee/0x130 [ 29.078437] [] ? rcu_read_lock_sched_held+0x103/0x120 [ 29.085242] [] ? kmem_cache_free+0x2a4/0x320 [ 29.091265] [] compat_readv+0xd9/0x140 [ 29.096765] [] compat_SyS_readv+0xd8/0x1b0 [ 29.102616] [] ? SyS_pwritev+0x230/0x230 [ 29.108300] [] ? do_fast_syscall_32+0xd7/0x890 [ 29.114496] [] ? SyS_pwritev+0x230/0x230 [ 29.120189] [] do_fast_syscall_32+0x314/0x890 [ 29.126305] [] sysenter_flags_fixed+0xd/0x17 [ 29.132323] [ 29.133916] Allocated by task 0: [ 29.137241] (stack is not available) [ 29.140925] [ 29.142516] Freed by task 0: [ 29.145500] (stack is not available) [ 29.149177] [ 29.150771] The buggy address belongs to the object at ffff8800b51a2100 [ 29.150771] which belongs to the cache fasync_cache of size 96 [ 29.163391] The buggy address is located 64 bytes inside of [ 29.163391] 96-byte region [ffff8800b51a2100, ffff8800b51a2160) [ 29.175053] The buggy address belongs to the page: [ 29.190145] kasan: CONFIG_KASAN_INLINE enabled [ 29.195357] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.208281] Dumping ftrace buffer: [ 29.211806] (ftrace buffer empty) [ 29.215509] Modules linked in: [ 29.218823] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.111-gc2f631b #20 [ 29.225833] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.235190] task: ffffffff84217840 task.stack: ffffffff84200000 [ 29.241238] RIP: 0010:[] [] rb_insert_color+0x9f/0xcb0 [ 29.249888] RSP: 0018:ffff8801db207d18 EFLAGS: 00010003 [ 29.255334] RAX: 0a0508a8e82a0be9 RBX: ffffffff838a8360 RCX: ffffffff838a8360 [ 29.262608] RDX: 1ffffffff071506d RSI: ffff8801db219710 RDI: ffff8801db219c40 [ 29.269875] RBP: ffff8801db207d60 R08: ffffffff85807f08 R09: 0000000000000001 [ 29.277141] R10: 0000000000000000 R11: 1ffff1003b640f62 R12: ffff8800b401fdf8 [ 29.284409] R13: 5028454741505f4e R14: ffff8801db219c40 R15: dffffc0000000000 [ 29.291680] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.299910] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.305787] CR2: 000055d45a483120 CR3: 00000001d119e000 CR4: 0000000000160670 [ 29.313055] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.320320] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.327584] Stack: [ 29.329732] ffffffff842bcb20 ffffffff842180b0 0000000000000000 ffff8801db207d70 [ 29.337761] ffff8801db219c40 dffffc0000000000 0000000000000000 ffff8801db219710 [ 29.345788] ffff8800b401fe00 ffff8801db207db0 ffffffff81d22a07 ffff8801db219c58 [ 29.353813] Call Trace: [ 29.356376] [ 29.358437] [] timerqueue_add+0x157/0x2a0 [ 29.364546] [] enqueue_hrtimer+0x168/0x450 [ 29.370440] [] __hrtimer_run_queues+0x732/0xfe0 [ 29.376787] [] ? hrtimer_fixup_init+0x70/0x70 [ 29.382947] [] ? hrtimer_interrupt+0x131/0x440 [ 29.389191] [] hrtimer_interrupt+0x1a6/0x440 [ 29.395256] [] local_apic_timer_interrupt+0x6a/0xb0 [ 29.401949] [] smp_apic_timer_interrupt+0x76/0xa0 [ 29.408453] [] apic_timer_interrupt+0xa0/0xb0 [ 29.414592] [ 29.416667] [] ? native_safe_halt+0x6/0x10 [ 29.422861] [] default_idle+0x55/0x3c0 [ 29.428400] [] arch_cpu_idle+0xa/0x10 [ 29.433864] [] default_idle_call+0x48/0x70 [ 29.439755] [] cpu_startup_entry+0x605/0x820 [ 29.445829] [] ? call_cpuidle+0xe0/0xe0 [ 29.451465] [] rest_init+0x189/0x190 [ 29.456838] [] start_kernel+0x6b9/0x6ee [ 29.462471] [] ? thread_stack_cache_init+0xb/0xb [ 29.468895] [] ? early_idt_handler_array+0x120/0x120 [ 29.475660] [] ? early_idt_handler_array+0x120/0x120 [ 29.482429] [] x86_64_start_reservations+0x2a/0x2c [ 29.489036] [] x86_64_start_kernel+0x140/0x163 [ 29.495256] 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 [ 29.522364] RIP [] rb_insert_color+0x9f/0xcb0 [ 29.528646] RSP [ 29.532272] ---[ end trace 232982b194565420 ]--- [ 29.537022] Kernel panic - not syncing: Fatal exception in interrupt [ 30.655659] Shutting down cpus with NMI [ 30.660242] Dumping ftrace buffer: [ 30.663757] (ftrace buffer empty) [ 30.667438] Kernel Offset: disabled [ 30.671030] Rebooting in 86400 seconds..