[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.544802] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.344237] random: sshd: uninitialized urandom read (32 bytes read) [ 24.747278] random: sshd: uninitialized urandom read (32 bytes read) [ 25.612849] random: sshd: uninitialized urandom read (32 bytes read) [ 27.785952] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.35' (ECDSA) to the list of known hosts. [ 33.237576] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.334539] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 33.342598] PGD 1d8dcd067 P4D 1d8dcd067 PUD 1d7868067 PMD 0 [ 33.348452] Oops: 0010 [#1] SMP KASAN [ 33.352243] CPU: 0 PID: 4580 Comm: syz-executor737 Not tainted 4.17.0+ #92 [ 33.359247] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.368592] RIP: 0010: (null) [ 33.372456] Code: Bad RIP value. [ 33.375821] RSP: 0018:ffff8801d92f73a0 EFLAGS: 00010246 [ 33.381171] RAX: 0000000000000000 RBX: ffff8801ac06a800 RCX: 1ffffffff10ea8e5 [ 33.388424] RDX: ffff8801d92f7c00 RSI: ffff8801a86b1480 RDI: ffff8801d938fd40 [ 33.395676] RBP: ffff8801d92f7510 R08: ffff8801d9742838 R09: 0000000000000006 [ 33.402931] R10: ffff8801d9742000 R11: 0000000000000000 R12: 1ffff1003b25ee79 [ 33.410188] R13: ffff8801d92f7c00 R14: ffff8801ac06a812 R15: ffff8801ac06ac58 [ 33.417446] FS: 0000000001059880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 33.425662] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.431531] CR2: ffffffffffffffd6 CR3: 00000001ac7d5000 CR4: 00000000001406f0 [ 33.438816] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.446077] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.453337] Call Trace: [ 33.455931] ? smc_poll+0x211/0xdd0 [ 33.459549] ? __smc_connect+0xa90/0xa90 [ 33.463610] ? save_stack+0x43/0xd0 [ 33.467223] ? kasan_kmalloc+0xc4/0xe0 [ 33.471095] ? kasan_slab_alloc+0x12/0x20 [ 33.475230] ? kmem_cache_alloc+0x12e/0x760 [ 33.479540] ? ep_insert+0x270/0x1c00 [ 33.483335] ? __x64_sys_epoll_ctl+0xef1/0x10f0 [ 33.488005] ? do_syscall_64+0x1b1/0x800 [ 33.492068] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.497427] ? graph_lock+0x170/0x170 [ 33.501228] ? debug_check_no_locks_freed+0x310/0x310 [ 33.506407] ? find_held_lock+0x36/0x1c0 [ 33.510467] ? print_usage_bug+0xc0/0xc0 [ 33.514512] sock_poll+0x1d1/0x710 [ 33.518045] ? __smc_connect+0xa90/0xa90 [ 33.522097] ? sock_get_poll_head+0x460/0x460 [ 33.526588] ? sock_get_poll_head+0x460/0x460 [ 33.531067] vfs_poll+0x77/0x2a0 [ 33.534428] ep_item_poll.isra.15+0x2c1/0x390 [ 33.538927] ? rcu_read_lock_sched_held+0x108/0x120 [ 33.543926] ? ep_eventpoll_poll+0x1f0/0x1f0 [ 33.548315] ? ep_insert+0x270/0x1c00 [ 33.552110] ep_insert+0x6b8/0x1c00 [ 33.555722] ? pudp_huge_clear_flush+0x230/0x230 [ 33.560470] ? ep_send_events_proc+0xee0/0xee0 [ 33.565041] ? lock_release+0xa10/0xa10 [ 33.569010] ? check_same_owner+0x320/0x320 [ 33.573321] ? rcu_note_context_switch+0x710/0x710 [ 33.578234] ? __might_sleep+0x95/0x190 [ 33.582195] ? kasan_check_write+0x14/0x20 [ 33.586416] ? __mutex_lock+0x7d9/0x17f0 [ 33.590459] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.595815] ? __x64_sys_epoll_ctl+0x518/0x10f0 [ 33.600475] ? mutex_trylock+0x2a0/0x2a0 [ 33.604524] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.609521] ? graph_lock+0x170/0x170 [ 33.613310] ? pud_val+0x80/0xf0 [ 33.616657] ? pmd_val+0xf0/0xf0 [ 33.620008] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.625543] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.631071] ? __handle_mm_fault+0x93a/0x4390 [ 33.635569] ? find_held_lock+0x36/0x1c0 [ 33.639617] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.645139] ? __fget_light+0x2ef/0x430 [ 33.649103] ? fget_raw+0x20/0x20 [ 33.652539] ? find_held_lock+0x36/0x1c0 [ 33.656585] ? __might_sleep+0x95/0x190 [ 33.660562] ? clear_tfile_check_list+0x380/0x380 [ 33.665390] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 33.670566] __x64_sys_epoll_ctl+0xef1/0x10f0 [ 33.675057] ? __ia32_sys_epoll_create+0x70/0x70 [ 33.679846] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.685387] ? __do_page_fault+0x441/0xe40 [ 33.689615] ? mm_fault_error+0x380/0x380 [ 33.693760] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 33.698589] ? do_syscall_64+0x92/0x800 [ 33.702553] do_syscall_64+0x1b1/0x800 [ 33.706428] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.711356] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.716306] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.721840] ? retint_user+0x18/0x18 [ 33.725536] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.730375] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.735565] RIP: 0033:0x43fd09 [ 33.738741] 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 [ 33.757875] RSP: 002b:00007ffe597003f8 EFLAGS: 00000203 ORIG_RAX: 00000000000000e9 [ 33.765568] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd09 [ 33.772821] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 [ 33.780082] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 33.787348] R10: 0000000020c85000 R11: 0000000000000203 R12: 0000000000401630 [ 33.794605] R13: 00000000004016c0 R14: 0000000000000000 R15: 0000000000000000 [ 33.801884] Modules linked in: [ 33.805127] Dumping ftrace buffer: [ 33.808677] (ftrace buffer empty) [ 33.812376] CR2: 0000000000000000 [ 33.815946] ---[ end trace e726acb844f4ffbd ]--- [ 33.820754] RIP: 0010: (null) [ 33.824692] Code: Bad RIP value. [ 33.828115] RSP: 0018:ffff8801d92f73a0 EFLAGS: 00010246 [ 33.833557] RAX: 0000000000000000 RBX: ffff8801ac06a800 RCX: 1ffffffff10ea8e5 [ 33.840883] RDX: ffff8801d92f7c00 RSI: ffff8801a86b1480 RDI: ffff8801d938fd40 [ 33.848181] RBP: ffff8801d92f7510 R08: ffff8801d9742838 R09: 0000000000000006 [ 33.855476] R10: ffff8801d9742000 R11: 0000000000000000 R12: 1ffff1003b25ee79 [ 33.862795] R13: ffff8801d92f7c00 R14: ffff8801ac06a812 R15: ffff8801ac06ac58 [ 33.870125] FS: 0000000001059880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 33.878400] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.884309] CR2: ffffffffffffffd6 CR3: 00000001ac7d5000 CR4: 00000000001406f0 [ 33.891640] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.898962] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.906277] Kernel panic - not syncing: Fatal exception [ 33.912274] Dumping ftrace buffer: [ 33.915848] (ftrace buffer empty) [ 33.919593] Kernel Offset: disabled [ 33.923262] Rebooting in 86400 seconds..