[ 15.946016] 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: [ 21.600518] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.949038] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.859602] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) [ 23.046726] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) Warning: Permanently added '10.128.15.229' (ECDSA) to the list of known hosts. [ 28.450201] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) executing program executing program [ 28.554354] ================================================================== [ 28.561749] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 28.568733] Read of size 8 at addr ffff8801d2636240 by task syzkaller155934/3317 [ 28.576239] [ 28.577842] CPU: 1 PID: 3317 Comm: syzkaller155934 Not tainted 4.4.111-gc2f631b #27 [ 28.585603] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.594937] 0000000000000000 9ba6d4ca10317b46 ffff8801d0be7ab0 ffffffff81d0513d [ 28.602910] ffffea0007498d80 ffff8801d2636240 0000000000000000 ffff8801d2636240 [ 28.610878] ffff8801d00b0238 ffff8801d0be7ae8 ffffffff814fd433 ffff8801d2636240 [ 28.618878] Call Trace: [ 28.621442] [] dump_stack+0xc1/0x124 [ 28.626789] [] print_address_description+0x73/0x260 [ 28.633437] [] kasan_report+0x285/0x370 [ 28.639048] [] ? sg_remove_request+0xf9/0x110 [ 28.645179] [] __asan_report_load8_noabort+0x14/0x20 [ 28.651925] [] sg_remove_request+0xf9/0x110 [ 28.657872] [] sg_finish_rem_req+0x295/0x340 [ 28.663900] [] sg_read+0xa21/0x1490 [ 28.669144] [] ? do_futex+0x3e3/0x1670 [ 28.674656] [] ? do_sys_open+0x23a/0x4b0 [ 28.680346] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.687007] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.694007] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.700662] [] __vfs_read+0x103/0x440 [ 28.706096] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 28.712999] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.718943] [] ? fsnotify+0x5ad/0xee0 [ 28.724364] [] ? fsnotify+0xee0/0xee0 [ 28.729784] [] ? avc_policy_seqno+0x9/0x20 [ 28.735639] [] ? selinux_file_permission+0x348/0x460 [ 28.742360] [] ? security_file_permission+0x89/0x1e0 [ 28.749083] [] ? rw_verify_area+0x100/0x2f0 [ 28.755022] [] vfs_read+0x123/0x3a0 [ 28.760266] [] SyS_read+0xd9/0x1b0 [ 28.765424] [] ? do_sendfile+0xd30/0xd30 [ 28.771105] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.777572] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.784127] [ 28.785728] Allocated by task 0: [ 28.789062] (stack is not available) [ 28.792744] [ 28.794351] Freed by task 0: [ 28.797339] (stack is not available) [ 28.801022] [ 28.802622] The buggy address belongs to the object at ffff8801d2636200 [ 28.802622] which belongs to the cache fasync_cache of size 96 [ 28.815258] The buggy address is located 64 bytes inside of [ 28.815258] 96-byte region [ffff8801d2636200, ffff8801d2636260) [ 28.826932] The buggy address belongs to the page: [ 28.840410] kasan: CONFIG_KASAN_INLINE enabled [ 28.844872] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.857819] Dumping ftrace buffer: [ 28.861348] (ftrace buffer empty) [ 28.865057] Modules linked in: [ 28.868380] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.111-gc2f631b #27 [ 28.875391] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.884766] task: ffffffff84217840 task.stack: ffffffff84200000 [ 28.890828] RIP: 0010:[] [] rb_insert_color+0x9f/0xcb0 [ 28.899476] RSP: 0018:ffff8801db207d18 EFLAGS: 00010003 [ 28.904922] RAX: 0a0508a8e82a0be9 RBX: ffffffff838a8360 RCX: ffffffff838a8360 [ 28.912191] RDX: 1ffffffff071506d RSI: ffff8801db219710 RDI: ffff8801db219c40 [ 28.919472] RBP: ffff8801db207d60 R08: ffffffff85807f08 R09: 0000000000000001 [ 28.926745] R10: 0000000000000000 R11: 1ffff1003b640f62 R12: ffff8801d0a9fdf8 [ 28.934021] R13: 5028454741505f4e R14: ffff8801db219c40 R15: dffffc0000000000 [ 28.941300] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.949527] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.955421] CR2: 0000000020e48000 CR3: 00000001d0c78000 CR4: 0000000000160670 [ 28.962703] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.969981] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.977246] Stack: [ 28.979392] ffffffff842bcb20 ffffffff842180b0 0000000000000000 ffff8801db207d70 [ 28.987471] ffff8801db219c40 dffffc0000000000 0000000000000000 ffff8801db219710 [ 28.995543] ffff8801d0a9fe00 ffff8801db207db0 ffffffff81d22a07 ffff8801db219c58 [ 29.003599] Call Trace: [ 29.006171] [ 29.008236] [] timerqueue_add+0x157/0x2a0 [ 29.014367] [] enqueue_hrtimer+0x168/0x450 [ 29.020268] [] __hrtimer_run_queues+0x732/0xfe0 [ 29.026603] [] ? hrtimer_fixup_init+0x70/0x70 [ 29.032772] [] ? hrtimer_interrupt+0x131/0x440 [ 29.039024] [] hrtimer_interrupt+0x1a6/0x440 [ 29.045094] [] local_apic_timer_interrupt+0x6a/0xb0 [ 29.051774] [] smp_apic_timer_interrupt+0x76/0xa0 [ 29.058280] [] apic_timer_interrupt+0xa0/0xb0 [ 29.064428] [ 29.066505] [] ? native_safe_halt+0x6/0x10 [ 29.072711] [] default_idle+0x55/0x3c0 [ 29.078264] [] arch_cpu_idle+0xa/0x10 [ 29.083729] [] default_idle_call+0x48/0x70 [ 29.089630] [] cpu_startup_entry+0x605/0x820 [ 29.095705] [] ? call_cpuidle+0xe0/0xe0 [ 29.101340] [] rest_init+0x189/0x190 [ 29.106717] [] start_kernel+0x6b9/0x6ee [ 29.112444] [] ? thread_stack_cache_init+0xb/0xb [ 29.118888] [] ? early_idt_handler_array+0x120/0x120 [ 29.125654] [] ? early_idt_handler_array+0x120/0x120 [ 29.132421] [] x86_64_start_reservations+0x2a/0x2c [ 29.139019] [] x86_64_start_kernel+0x140/0x163 [ 29.145248] 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 [ 29.172787] RIP [] rb_insert_color+0x9f/0xcb0 [ 29.179066] RSP [ 29.182695] ---[ end trace 45d8d5140e654a9d ]--- [ 29.187449] Kernel panic - not syncing: Fatal exception in interrupt [ 30.303803] Shutting down cpus with NMI [ 30.308604] Dumping ftrace buffer: [ 30.312138] (ftrace buffer empty) [ 30.315818] Kernel Offset: disabled [ 30.319415] Rebooting in 86400 seconds..