[ 16.986822] random: sshd: uninitialized urandom read (32 bytes read, 34 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: [ 20.841075] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.295069] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.167055] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) [ 28.129135] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. [ 33.522170] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available) executing program [ 33.617069] ================================================================== [ 33.624474] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 33.631460] Read of size 8 at addr ffff8801d310c140 by task syzkaller817555/3313 [ 33.638961] [ 33.640564] CPU: 1 PID: 3313 Comm: syzkaller817555 Not tainted 4.4.113-gef588ef #33 [ 33.648328] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.657656] 0000000000000000 78d70ff645df97e0 ffff8801d133fab0 ffffffff81d0278d [ 33.665635] ffffea00074c4300 ffff8801d310c140 0000000000000000 ffff8801d310c140 [ 33.673611] ffff8801d0998238 ffff8801d133fae8 ffffffff814fd053 ffff8801d310c140 [ 33.681586] Call Trace: [ 33.684153] [] dump_stack+0xc1/0x124 [ 33.689499] [] print_address_description+0x73/0x260 [ 33.696141] [] kasan_report+0x285/0x370 [ 33.701743] [] ? sg_remove_request+0xf9/0x110 [ 33.707867] [] __asan_report_load8_noabort+0x14/0x20 [ 33.714593] [] sg_remove_request+0xf9/0x110 [ 33.720535] [] sg_finish_rem_req+0x295/0x340 [ 33.726565] [] sg_read+0xa1b/0x1490 [ 33.731813] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.738458] [] ? new_slab+0x2df/0x3b0 [ 33.743902] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.750558] [] __vfs_read+0x103/0x440 [ 33.755990] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 33.762981] [] ? vfs_iter_write+0x2d0/0x2d0 [ 33.768928] [] ? fsnotify+0x5ad/0xee0 [ 33.774352] [] ? fsnotify+0xee0/0xee0 [ 33.779779] [] ? lockdep_init_map+0xeb/0x1690 [ 33.785902] [] ? avc_policy_seqno+0x9/0x20 [ 33.791773] [] ? selinux_file_permission+0x348/0x460 [ 33.798523] [] ? security_file_permission+0x89/0x1e0 [ 33.805268] [] ? rw_verify_area+0x100/0x2f0 [ 33.811212] [] vfs_read+0x123/0x3a0 [ 33.816479] [] SyS_read+0xd9/0x1b0 [ 33.821647] [] ? do_sendfile+0xd30/0xd30 [ 33.827334] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.833805] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 33.840358] [ 33.841962] Allocated by task 0: [ 33.845297] (stack is not available) [ 33.848978] [ 33.850577] Freed by task 0: [ 33.853563] (stack is not available) [ 33.857244] [ 33.858848] The buggy address belongs to the object at ffff8801d310c100 [ 33.858848] which belongs to the cache fasync_cache of size 96 [ 33.871479] The buggy address is located 64 bytes inside of [ 33.871479] 96-byte region [ffff8801d310c100, ffff8801d310c160) [ 33.883152] The buggy address belongs to the page: [ 33.888654] kasan: CONFIG_KASAN_INLINE enabled [ 33.893075] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.905918] Dumping ftrace buffer: [ 33.909433] (ftrace buffer empty) [ 33.913124] Modules linked in: [ 33.916409] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.113-gef588ef #33 [ 33.923415] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.932751] task: ffffffff84217840 task.stack: ffffffff84200000 [ 33.938835] RIP: 0010:[] [] rb_insert_color+0x9f/0xcb0 [ 33.947427] RSP: 0018:ffff8801db207d18 EFLAGS: 00010003 [ 33.952851] RAX: 0a0508a8e82a0be9 RBX: ffffffff838a8de0 RCX: ffffffff838a8de0 [ 33.960114] RDX: 1ffffffff07151bd RSI: ffff8801db219710 RDI: ffff8801db219c40 [ 33.967366] RBP: ffff8801db207d60 R08: ffffffff8580af08 R09: 0000000000000001 [ 33.974613] R10: 0000000000000000 R11: 1ffff1003b640f62 R12: ffff8801d130fdf8 [ 33.981861] R13: 5028454741505f4e R14: ffff8801db219c40 R15: dffffc0000000000 [ 33.989113] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.997325] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.003667] CR2: 000055e456b1c110 CR3: 00000000b61d2000 CR4: 0000000000160670 [ 34.010943] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.018214] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.025459] Stack: [ 34.027580] ffffffff842bdb20 ffffffff842180b0 0000000000000000 ffff8801db207d70 [ 34.035582] ffff8801db219c40 dffffc0000000000 0000000000000000 ffff8801db219710 [ 34.043580] ffff8801d130fe00 ffff8801db207db0 ffffffff81d20067 ffff8801db219c58 [ 34.051550] Call Trace: [ 34.054106] [ 34.056147] [] timerqueue_add+0x157/0x2a0 [ 34.062225] [] enqueue_hrtimer+0x168/0x450 [ 34.068108] [] __hrtimer_run_queues+0x732/0xfe0 [ 34.074420] [] ? hrtimer_fixup_init+0x70/0x70 [ 34.080553] [] ? hrtimer_interrupt+0x131/0x440 [ 34.086799] [] hrtimer_interrupt+0x1a6/0x440 [ 34.092849] [] local_apic_timer_interrupt+0x6a/0xb0 [ 34.099513] [] smp_apic_timer_interrupt+0x76/0xa0 [ 34.105990] [] apic_timer_interrupt+0xa0/0xb0 [ 34.112110] [ 34.114155] [] ? native_safe_halt+0x6/0x10 [ 34.120331] [] default_idle+0x55/0x3c0 [ 34.125845] [] arch_cpu_idle+0xa/0x10 [ 34.131292] [] default_idle_call+0x48/0x70 [ 34.137165] [] cpu_startup_entry+0x5fd/0x8f0 [ 34.143207] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 34.150115] [] ? call_cpuidle+0xe0/0xe0 [ 34.155716] [] rest_init+0x189/0x190 [ 34.161076] [] start_kernel+0x6b9/0x6ee [ 34.166699] [] ? thread_stack_cache_init+0xb/0xb [ 34.173097] [] ? early_idt_handler_array+0x120/0x120 [ 34.179827] [] ? early_idt_handler_array+0x120/0x120 [ 34.186557] [] x86_64_start_reservations+0x2a/0x2c [ 34.193108] [] x86_64_start_kernel+0x140/0x163 [ 34.199310] 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 [ 34.225970] RIP [] rb_insert_color+0x9f/0xcb0 [ 34.232212] RSP [ 34.235813] ---[ end trace fd5fcaf65e15aa2e ]--- [ 34.240539] Kernel panic - not syncing: Fatal exception in interrupt [ 35.322370] Shutting down cpus with NMI [ 35.327126] Dumping ftrace buffer: [ 35.330641] (ftrace buffer empty) [ 35.334325] Kernel Offset: disabled [ 35.337924] Rebooting in 86400 seconds..