[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m[ 16.400385] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) 8[?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: [ 20.787068] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.085546] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.927221] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) [ 26.594995] random: sshd: uninitialized urandom read (32 bytes read, 104 bits of entropy available) Warning: Permanently added '10.128.15.232' (ECDSA) to the list of known hosts. [ 32.387967] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) executing program [ 32.484201] ================================================================== [ 32.491611] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 32.498596] Read of size 8 at addr ffff8800b4917140 by task syzkaller883813/3325 [ 32.506105] [ 32.507708] CPU: 1 PID: 3325 Comm: syzkaller883813 Not tainted 4.4.111-gc2f631b #27 [ 32.515470] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.524796] 0000000000000000 ec2a2cfb80b36bc8 ffff8801d0f6f9f0 ffffffff81d0513d [ 32.532778] ffffea0002d245c0 ffff8800b4917140 0000000000000000 ffff8800b4917140 [ 32.540760] ffff8800b46d0238 ffff8801d0f6fa28 ffffffff814fd433 ffff8800b4917140 [ 32.548733] Call Trace: [ 32.551295] [] dump_stack+0xc1/0x124 [ 32.556634] [] print_address_description+0x73/0x260 [ 32.563270] [] kasan_report+0x285/0x370 [ 32.568874] [] ? sg_remove_request+0xf9/0x110 [ 32.574988] [] __asan_report_load8_noabort+0x14/0x20 [ 32.581711] [] sg_remove_request+0xf9/0x110 [ 32.587651] [] sg_finish_rem_req+0x295/0x340 [ 32.593687] [] sg_read+0xa21/0x1490 [ 32.598937] [] ? __check_object_size+0x154/0x35b [ 32.605311] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 32.611954] [] ? fsnotify+0xee0/0xee0 [ 32.617387] [] ? avc_policy_seqno+0x9/0x20 [ 32.623254] [] do_loop_readv_writev+0x141/0x1e0 [ 32.629564] [] ? security_file_permission+0x89/0x1e0 [ 32.636286] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 32.642930] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 32.649565] [] do_readv_writev+0x5dd/0x6e0 [ 32.655428] [] ? vfs_write+0x530/0x530 [ 32.660936] [] ? handle_mm_fault+0xbf5/0x3190 [ 32.667052] [] ? _raw_spin_unlock+0x2c/0x50 [ 32.672991] [] ? handle_mm_fault+0x3f2/0x3190 [ 32.679279] [] ? sg_fasync+0x8d/0xb0 [ 32.684614] [] vfs_readv+0x78/0xb0 [ 32.689780] [] SyS_readv+0xd9/0x240 [ 32.695025] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 32.701579] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 32.708139] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 32.714701] [ 32.716299] Allocated by task 0: [ 32.719630] (stack is not available) [ 32.723311] [ 32.724917] Freed by task 0: [ 32.727903] (stack is not available) [ 32.731581] [ 32.733189] The buggy address belongs to the object at ffff8800b4917100 [ 32.733189] which belongs to the cache fasync_cache of size 96 [ 32.745814] The buggy address is located 64 bytes inside of [ 32.745814] 96-byte region [ffff8800b4917100, ffff8800b4917160) [ 32.757482] The buggy address belongs to the page: [ 32.772379] kasan: CONFIG_KASAN_INLINE enabled [ 32.776821] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.789770] Dumping ftrace buffer: [ 32.793302] (ftrace buffer empty) [ 32.797063] Modules linked in: [ 32.800384] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.111-gc2f631b #27 [ 32.807393] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.816751] task: ffffffff84217840 task.stack: ffffffff84200000 [ 32.822814] RIP: 0010:[] [] rb_insert_color+0x9f/0xcb0 [ 32.831629] RSP: 0018:ffff8801db207d18 EFLAGS: 00010003 [ 32.837078] RAX: 0a0508a8e82a0be9 RBX: ffffffff838a8360 RCX: ffffffff838a8360 [ 32.844350] RDX: 1ffffffff071506d RSI: ffff8801db219710 RDI: ffff8801db219c40 [ 32.851626] RBP: ffff8801db207d60 R08: ffffffff85807f08 R09: 0000000000000001 [ 32.858902] R10: 0000000000000000 R11: 1ffff1003b640f62 R12: ffff8801d0d57df8 [ 32.866183] R13: 5028454741505f4e R14: ffff8801db219c40 R15: dffffc0000000000 [ 32.873488] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.881722] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.887609] CR2: 0000556406296110 CR3: 00000001d5268000 CR4: 0000000000160670 [ 32.894883] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.902158] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.909440] Stack: [ 32.911592] ffffffff842bcb20 ffffffff842180b0 0000000000000000 ffff8801db207d70 [ 32.919652] ffff8801db219c40 dffffc0000000000 0000000000000000 ffff8801db219710 [ 32.927701] ffff8801d0d57e00 ffff8801db207db0 ffffffff81d22a07 ffff8801db219c58 [ 32.935750] Call Trace: [ 32.938326] [ 32.940395] [] timerqueue_add+0x157/0x2a0 [ 32.946493] [] enqueue_hrtimer+0x168/0x450 [ 32.952384] [] __hrtimer_run_queues+0x732/0xfe0 [ 32.958719] [] ? hrtimer_fixup_init+0x70/0x70 [ 32.964882] [] ? hrtimer_interrupt+0x131/0x440 [ 32.971131] [] hrtimer_interrupt+0x1a6/0x440 [ 32.977205] [] local_apic_timer_interrupt+0x6a/0xb0 [ 32.983887] [] smp_apic_timer_interrupt+0x76/0xa0 [ 32.990391] [] apic_timer_interrupt+0xa0/0xb0 [ 32.996532] [ 32.998607] [] ? native_safe_halt+0x6/0x10 [ 33.004836] [] default_idle+0x55/0x3c0 [ 33.010389] [] arch_cpu_idle+0xa/0x10 [ 33.015871] [] default_idle_call+0x48/0x70 [ 33.021779] [] cpu_startup_entry+0x605/0x820 [ 33.027858] [] ? call_cpuidle+0xe0/0xe0 [ 33.033503] [] rest_init+0x189/0x190 [ 33.038886] [] start_kernel+0x6b9/0x6ee [ 33.044523] [] ? thread_stack_cache_init+0xb/0xb [ 33.050947] [] ? early_idt_handler_array+0x120/0x120 [ 33.057714] [] ? early_idt_handler_array+0x120/0x120 [ 33.064477] [] x86_64_start_reservations+0x2a/0x2c [ 33.071076] [] x86_64_start_kernel+0x140/0x163 [ 33.077311] 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 [ 33.104938] RIP [] rb_insert_color+0x9f/0xcb0 [ 33.111225] RSP [ 33.114853] ---[ end trace 44414b15324f5985 ]--- [ 33.119607] Kernel panic - not syncing: Fatal exception in interrupt [ 34.188187] Shutting down cpus with NMI [ 34.192632] Dumping ftrace buffer: [ 34.196157] (ftrace buffer empty) [ 34.199835] Kernel Offset: disabled [ 34.203432] Rebooting in 86400 seconds..