[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.977577] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 19.430311] random: sshd: uninitialized urandom read (32 bytes read) [ 19.768275] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.574235] random: sshd: uninitialized urandom read (32 bytes read) [ 20.731187] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.58' (ECDSA) to the list of known hosts. [ 26.262649] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.351324] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 26.359307] PGD 1d8c19067 P4D 1d8c19067 PUD 1d8c18067 PMD 0 [ 26.365096] Oops: 0010 [#1] SMP KASAN [ 26.368874] CPU: 1 PID: 4520 Comm: syz-executor154 Not tainted 4.17.0+ #96 [ 26.375860] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.385190] RIP: 0010: (null) [ 26.389048] Code: Bad RIP value. [ 26.392399] RSP: 0018:ffff8801d07d73a0 EFLAGS: 00010246 [ 26.397738] RAX: 0000000000000000 RBX: ffff8801acf44800 RCX: 1ffffffff10ea9fd [ 26.404984] RDX: ffff8801d07d7c00 RSI: ffff8801d4fbb040 RDI: ffff8801d94c4040 [ 26.412233] RBP: ffff8801d07d7510 R08: ffff8801d9766978 R09: 0000000000000006 [ 26.419478] R10: ffff8801d9766140 R11: 0000000000000000 R12: 1ffff1003a0fae79 [ 26.426734] R13: ffff8801d07d7c00 R14: ffff8801acf44812 R15: ffff8801acf44c58 [ 26.433991] FS: 00000000007cc880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 26.442195] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.448054] CR2: ffffffffffffffd6 CR3: 00000001ac5dd000 CR4: 00000000001406e0 [ 26.455320] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.462569] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.469819] Call Trace: [ 26.472384] ? smc_poll+0x211/0xdd0 [ 26.475991] ? __smc_connect+0xa90/0xa90 [ 26.480046] ? save_stack+0x43/0xd0 [ 26.483648] ? kasan_kmalloc+0xc4/0xe0 [ 26.487512] ? kasan_slab_alloc+0x12/0x20 [ 26.491634] ? kmem_cache_alloc+0x12e/0x760 [ 26.495933] ? ep_insert+0x270/0x1c00 [ 26.499713] ? __x64_sys_epoll_ctl+0xef1/0x10f0 [ 26.504361] ? do_syscall_64+0x1b1/0x800 [ 26.508400] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 26.513740] ? graph_lock+0x170/0x170 [ 26.517518] ? debug_check_no_locks_freed+0x310/0x310 [ 26.522684] ? find_held_lock+0x36/0x1c0 [ 26.526731] ? print_usage_bug+0xc0/0xc0 [ 26.530771] sock_poll+0x1d1/0x710 [ 26.534290] ? __smc_connect+0xa90/0xa90 [ 26.538328] ? sock_get_poll_head+0x460/0x460 [ 26.542824] ? sock_get_poll_head+0x460/0x460 [ 26.547295] vfs_poll+0x77/0x2a0 [ 26.550649] ep_item_poll.isra.15+0x2c1/0x390 [ 26.555123] ? rcu_read_lock_sched_held+0x108/0x120 [ 26.560117] ? ep_eventpoll_poll+0x1f0/0x1f0 [ 26.564502] ? ep_insert+0x270/0x1c00 [ 26.568281] ep_insert+0x6b8/0x1c00 [ 26.571885] ? pudp_huge_clear_flush+0x230/0x230 [ 26.576620] ? ep_send_events_proc+0xee0/0xee0 [ 26.581180] ? lock_release+0xa10/0xa10 [ 26.585132] ? check_same_owner+0x320/0x320 [ 26.589440] ? rcu_note_context_switch+0x710/0x710 [ 26.594346] ? __might_sleep+0x95/0x190 [ 26.598300] ? kasan_check_write+0x14/0x20 [ 26.602517] ? __mutex_lock+0x7d9/0x17f0 [ 26.606559] ? __x64_sys_epoll_ctl+0x518/0x10f0 [ 26.611206] ? find_held_lock+0x36/0x1c0 [ 26.615252] ? mutex_trylock+0x2a0/0x2a0 [ 26.619292] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.624286] ? graph_lock+0x170/0x170 [ 26.628065] ? lockdep_init_map+0x9/0x10 [ 26.632104] ? debug_mutex_init+0x2d/0x60 [ 26.636229] ? pud_val+0x80/0xf0 [ 26.639580] ? pmd_val+0xf0/0xf0 [ 26.642926] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.648440] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.653955] ? __handle_mm_fault+0x93a/0x4390 [ 26.658430] ? find_held_lock+0x36/0x1c0 [ 26.662471] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.667985] ? __fget_light+0x2ef/0x430 [ 26.671939] ? fget_raw+0x20/0x20 [ 26.675370] ? find_held_lock+0x36/0x1c0 [ 26.679406] ? __might_sleep+0x95/0x190 [ 26.683360] ? clear_tfile_check_list+0x380/0x380 [ 26.688181] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 26.693347] __x64_sys_epoll_ctl+0xef1/0x10f0 [ 26.697822] ? __ia32_sys_epoll_create+0x70/0x70 [ 26.702557] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.708073] ? __do_page_fault+0x441/0xe40 [ 26.712292] ? mm_fault_error+0x380/0x380 [ 26.716419] ? __ia32_sys_fallocate+0xf0/0xf0 [ 26.720898] ? do_syscall_64+0x92/0x800 [ 26.724853] do_syscall_64+0x1b1/0x800 [ 26.728719] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 26.733542] ? syscall_return_slowpath+0x5c0/0x5c0 [ 26.738450] ? syscall_return_slowpath+0x30f/0x5c0 [ 26.743357] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.748872] ? retint_user+0x18/0x18 [ 26.752563] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.757383] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 26.762551] RIP: 0033:0x43fce9 [ 26.765713] 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 [ 26.784826] RSP: 002b:00007ffebfdd9468 EFLAGS: 00000217 ORIG_RAX: 00000000000000e9 [ 26.792510] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fce9 [ 26.799755] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 [ 26.807002] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 26.814252] R10: 0000000020c7f000 R11: 0000000000000217 R12: 0000000000401610 [ 26.821497] R13: 00000000004016a0 R14: 0000000000000000 R15: 0000000000000000 [ 26.828741] Modules linked in: [ 26.831912] Dumping ftrace buffer: [ 26.835425] (ftrace buffer empty) [ 26.839110] CR2: 0000000000000000 [ 26.842619] ---[ end trace 3735a355b1606308 ]--- [ 26.847393] RIP: 0010: (null) [ 26.851287] Code: Bad RIP value. [ 26.854666] RSP: 0018:ffff8801d07d73a0 EFLAGS: 00010246 [ 26.860039] RAX: 0000000000000000 RBX: ffff8801acf44800 RCX: 1ffffffff10ea9fd [ 26.867307] RDX: ffff8801d07d7c00 RSI: ffff8801d4fbb040 RDI: ffff8801d94c4040 [ 26.874575] RBP: ffff8801d07d7510 R08: ffff8801d9766978 R09: 0000000000000006 [ 26.881852] R10: ffff8801d9766140 R11: 0000000000000000 R12: 1ffff1003a0fae79 [ 26.889122] R13: ffff8801d07d7c00 R14: ffff8801acf44812 R15: ffff8801acf44c58 [ 26.896404] FS: 00000000007cc880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 26.904627] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.910506] CR2: ffffffffffffffd6 CR3: 00000001ac5dd000 CR4: 00000000001406e0 [ 26.917792] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.925065] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.932333] Kernel panic - not syncing: Fatal exception [ 26.938138] Dumping ftrace buffer: [ 26.941655] (ftrace buffer empty) [ 26.945340] Kernel Offset: disabled [ 26.948944] Rebooting in 86400 seconds..