[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.118488] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.409722] random: sshd: uninitialized urandom read (32 bytes read) [ 28.170191] random: sshd: uninitialized urandom read (32 bytes read) [ 29.056702] random: sshd: uninitialized urandom read (32 bytes read) [ 29.223568] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.39' (ECDSA) to the list of known hosts. [ 34.768630] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.864217] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 34.872231] PGD 1c8bae067 P4D 1c8bae067 PUD 1ad292067 PMD 0 [ 34.878053] Oops: 0010 [#1] SMP KASAN [ 34.881845] CPU: 1 PID: 4603 Comm: syz-executor020 Not tainted 4.17.0+ #83 [ 34.888861] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.898225] RIP: 0010: (null) [ 34.902118] Code: Bad RIP value. [ 34.905480] RSP: 0018:ffff8801d911f3a0 EFLAGS: 00010246 [ 34.910831] RAX: 0000000000000000 RBX: ffff8801c8542800 RCX: 1ffffffff10ea785 [ 34.918108] RDX: ffff8801d911fc00 RSI: ffff8801a86744c0 RDI: ffff8801ac81d840 [ 34.925388] RBP: ffff8801d911f510 R08: ffff8801aef46b78 R09: 0000000000000006 [ 34.932648] R10: ffff8801aef46340 R11: 0000000000000000 R12: 1ffff1003b223e79 [ 34.939904] R13: ffff8801d911fc00 R14: ffff8801c8542812 R15: ffff8801c8542c58 [ 34.947167] FS: 0000000000eaf880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 34.955392] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.961271] CR2: ffffffffffffffd6 CR3: 00000001ad7da000 CR4: 00000000001406e0 [ 34.968546] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.975809] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.983071] Call Trace: [ 34.985660] ? smc_poll+0x211/0xdd0 [ 34.989304] ? __smc_connect+0xa90/0xa90 [ 34.993365] ? save_stack+0x43/0xd0 [ 34.996990] ? kasan_kmalloc+0xc4/0xe0 [ 35.000870] ? kasan_slab_alloc+0x12/0x20 [ 35.005009] ? kmem_cache_alloc+0x12e/0x760 [ 35.009325] ? ep_insert+0x270/0x1c00 [ 35.013124] ? __x64_sys_epoll_ctl+0xef1/0x10f0 [ 35.017801] ? do_syscall_64+0x1b1/0x800 [ 35.021862] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.027228] ? graph_lock+0x170/0x170 [ 35.031042] ? find_held_lock+0x36/0x1c0 [ 35.035107] ? print_usage_bug+0xc0/0xc0 [ 35.039156] sock_poll+0x1d1/0x710 [ 35.042684] ? __smc_connect+0xa90/0xa90 [ 35.046736] ? sock_get_poll_head+0x460/0x460 [ 35.051251] ? sock_get_poll_head+0x460/0x460 [ 35.055743] vfs_poll+0x77/0x2a0 [ 35.059127] ep_item_poll.isra.15+0x2c1/0x390 [ 35.063636] ? rcu_read_lock_sched_held+0x108/0x120 [ 35.068650] ? ep_eventpoll_poll+0x1f0/0x1f0 [ 35.073065] ? ep_insert+0x270/0x1c00 [ 35.076873] ep_insert+0x6b8/0x1c00 [ 35.080485] ? ep_send_events_proc+0xee0/0xee0 [ 35.085061] ? lock_release+0xa10/0xa10 [ 35.089028] ? check_same_owner+0x320/0x320 [ 35.093352] ? rcu_note_context_switch+0x710/0x710 [ 35.098294] ? __might_sleep+0x95/0x190 [ 35.102274] ? kasan_check_write+0x14/0x20 [ 35.106512] ? __mutex_lock+0x7d9/0x17f0 [ 35.110589] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.115968] ? __x64_sys_epoll_ctl+0x518/0x10f0 [ 35.120655] ? mutex_trylock+0x2a0/0x2a0 [ 35.124734] ? debug_mutex_init+0x1c/0x60 [ 35.128877] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 35.133898] ? graph_lock+0x170/0x170 [ 35.137697] ? pud_val+0x80/0xf0 [ 35.141063] ? pmd_val+0xf0/0xf0 [ 35.144438] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.149980] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.155517] ? __handle_mm_fault+0x93a/0x4310 [ 35.160006] ? find_held_lock+0x36/0x1c0 [ 35.164074] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.169606] ? __fget_light+0x2ef/0x430 [ 35.173577] ? fget_raw+0x20/0x20 [ 35.177018] ? find_held_lock+0x36/0x1c0 [ 35.181077] ? __might_sleep+0x95/0x190 [ 35.185055] ? clear_tfile_check_list+0x380/0x380 [ 35.189894] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 35.195089] __x64_sys_epoll_ctl+0xef1/0x10f0 [ 35.199590] ? __ia32_sys_epoll_create+0x70/0x70 [ 35.204335] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.209887] ? __do_page_fault+0x441/0xe40 [ 35.214110] ? mm_fault_error+0x380/0x380 [ 35.218251] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 35.223106] ? do_syscall_64+0x92/0x800 [ 35.227068] do_syscall_64+0x1b1/0x800 [ 35.230959] ? syscall_return_slowpath+0x5c0/0x5c0 [ 35.235890] ? syscall_return_slowpath+0x30f/0x5c0 [ 35.240814] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.246337] ? retint_user+0x18/0x18 [ 35.250062] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.254894] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.260098] RIP: 0033:0x43fd09 [ 35.263280] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 6b 45 00 00 c3 66 2e 0f 1f 84 00 00 00 00 [ 35.282431] RSP: 002b:00007ffc48f0d658 EFLAGS: 00000203 ORIG_RAX: 00000000000000e9 [ 35.290128] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd09 [ 35.297380] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 [ 35.304651] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 35.311930] R10: 0000000020c85000 R11: 0000000000000203 R12: 0000000000401630 [ 35.319194] R13: 00000000004016c0 R14: 0000000000000000 R15: 0000000000000000 [ 35.326460] Modules linked in: [ 35.329645] Dumping ftrace buffer: [ 35.333171] (ftrace buffer empty) [ 35.336871] CR2: 0000000000000000 [ 35.340366] ---[ end trace dcaab30c480c2f73 ]--- [ 35.345163] RIP: 0010: (null) [ 35.349085] Code: Bad RIP value. [ 35.352499] RSP: 0018:ffff8801d911f3a0 EFLAGS: 00010246 [ 35.357881] RAX: 0000000000000000 RBX: ffff8801c8542800 RCX: 1ffffffff10ea785 [ 35.365185] RDX: ffff8801d911fc00 RSI: ffff8801a86744c0 RDI: ffff8801ac81d840 [ 35.372491] RBP: ffff8801d911f510 R08: ffff8801aef46b78 R09: 0000000000000006 [ 35.379789] R10: ffff8801aef46340 R11: 0000000000000000 R12: 1ffff1003b223e79 [ 35.387113] R13: ffff8801d911fc00 R14: ffff8801c8542812 R15: ffff8801c8542c58 [ 35.394436] FS: 0000000000eaf880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 35.402728] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.408634] CR2: ffffffffffffffd6 CR3: 00000001ad7da000 CR4: 00000000001406e0 [ 35.415946] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.423298] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.430641] Kernel panic - not syncing: Fatal exception [ 35.436557] Dumping ftrace buffer: [ 35.440113] (ftrace buffer empty) [ 35.443824] Kernel Offset: disabled [ 35.447451] Rebooting in 86400 seconds..