[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.104693] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.851065] random: sshd: uninitialized urandom read (32 bytes read) [ 25.290006] random: sshd: uninitialized urandom read (32 bytes read) [ 26.121214] random: sshd: uninitialized urandom read (32 bytes read) [ 26.282988] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. [ 31.969662] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.062386] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 32.070405] PGD 1ab51a067 P4D 1ab51a067 PUD 1ab510067 PMD 0 [ 32.076204] Oops: 0010 [#1] SMP KASAN [ 32.079995] CPU: 0 PID: 4552 Comm: syz-executor998 Not tainted 4.18.0-rc2+ #121 [ 32.087420] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.096844] RIP: 0010: (null) [ 32.100705] Code: Bad RIP value. [ 32.104064] RSP: 0018:ffff8801ab4ef568 EFLAGS: 00010246 [ 32.109408] RAX: 0000000000000000 RBX: ffff8801d4ff34c0 RCX: ffffffff85ec9112 [ 32.116655] RDX: ffff8801ab4ef7c0 RSI: ffff8801d4ff34c0 RDI: ffff8801ad3f3800 [ 32.123903] RBP: ffff8801ab4ef610 R08: ffff8801d9596180 R09: ffffed003b5c46d6 [ 32.131157] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: ffff8801ab4ef7c0 [ 32.138413] R13: ffff8801ad3f3800 R14: ffffffff8818a920 R15: ffff8801ab414280 [ 32.145664] FS: 0000000000829880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 32.153877] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.159746] CR2: ffffffffffffffd6 CR3: 00000001ab53c000 CR4: 00000000001406f0 [ 32.166997] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.174375] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.181630] Call Trace: [ 32.184207] ? sock_poll+0x2e1/0x490 [ 32.187901] ? kernel_sendpage_locked+0x120/0x120 [ 32.192729] ? __lock_is_held+0xb5/0x140 [ 32.196772] ? kernel_sendpage_locked+0x120/0x120 [ 32.201595] ep_item_poll.isra.14+0x15c/0x400 [ 32.206070] ? ep_eventpoll_poll+0x200/0x200 [ 32.210461] ep_insert+0x6c1/0x1c20 [ 32.214072] ? ep_send_events_proc+0xf00/0xf00 [ 32.218636] ? lock_release+0xa30/0xa30 [ 32.222591] ? check_same_owner+0x340/0x340 [ 32.226890] ? clear_tfile_check_list+0x3a0/0x3a0 [ 32.231711] ? rcu_note_context_switch+0x730/0x730 [ 32.236711] ? kasan_check_write+0x14/0x20 [ 32.240945] ? __mutex_lock+0x7e8/0x1820 [ 32.244993] ? __x64_sys_epoll_ctl+0x7ea/0x10a0 [ 32.249654] ? __thp_get_unmapped_area+0x180/0x180 [ 32.254562] ? mutex_trylock+0x2b0/0x2b0 [ 32.258614] ? lockdep_init_map+0x9/0x10 [ 32.262664] ? debug_mutex_init+0x2d/0x60 [ 32.266809] ? pud_val+0x88/0x100 [ 32.270263] ? pmd_val+0x100/0x100 [ 32.273799] ? graph_lock+0x170/0x170 [ 32.277611] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.283141] ? __handle_mm_fault+0x94b/0x4460 [ 32.287622] ? find_held_lock+0x36/0x1c0 [ 32.291682] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.297205] ? __fget_light+0x2f7/0x440 [ 32.301155] ? fget_raw+0x20/0x20 [ 32.304584] ? find_held_lock+0x36/0x1c0 [ 32.308629] __x64_sys_epoll_ctl+0xf00/0x10a0 [ 32.313107] ? __ia32_sys_epoll_create+0x70/0x70 [ 32.317848] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.323364] ? mm_fault_error+0x380/0x380 [ 32.327500] ? move_addr_to_kernel+0x70/0x70 [ 32.331888] ? __ia32_sys_fallocate+0xf0/0xf0 [ 32.336362] ? do_syscall_64+0x9a/0x820 [ 32.340324] do_syscall_64+0x1b9/0x820 [ 32.344201] ? syscall_return_slowpath+0x5e0/0x5e0 [ 32.349108] ? syscall_return_slowpath+0x31d/0x5e0 [ 32.354028] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.359557] ? retint_user+0x18/0x18 [ 32.363253] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.368076] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.373257] RIP: 0033:0x43fce9 [ 32.376423] 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 [ 32.395625] RSP: 002b:00007ffe5e985b48 EFLAGS: 00000217 ORIG_RAX: 00000000000000e9 [ 32.403313] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fce9 [ 32.410565] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 [ 32.417812] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 32.425067] R10: 0000000020000000 R11: 0000000000000217 R12: 0000000000401610 [ 32.432505] R13: 00000000004016a0 R14: 0000000000000000 R15: 0000000000000000 [ 32.439784] Modules linked in: [ 32.442965] Dumping ftrace buffer: [ 32.446482] (ftrace buffer empty) [ 32.450172] CR2: 0000000000000000 [ 32.453675] ---[ end trace 1c1566da350a05d9 ]--- [ 32.458441] RIP: 0010: (null) [ 32.462326] Code: Bad RIP value. [ 32.465712] RSP: 0018:ffff8801ab4ef568 EFLAGS: 00010246 [ 32.471088] RAX: 0000000000000000 RBX: ffff8801d4ff34c0 RCX: ffffffff85ec9112 [ 32.478372] RDX: ffff8801ab4ef7c0 RSI: ffff8801d4ff34c0 RDI: ffff8801ad3f3800 [ 32.485660] RBP: ffff8801ab4ef610 R08: ffff8801d9596180 R09: ffffed003b5c46d6 [ 32.492939] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: ffff8801ab4ef7c0 [ 32.500222] R13: ffff8801ad3f3800 R14: ffffffff8818a920 R15: ffff8801ab414280 [ 32.507513] FS: 0000000000829880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 32.515755] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.521647] CR2: ffffffffffffffd6 CR3: 00000001ab53c000 CR4: 00000000001406f0 [ 32.528930] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.536209] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.543495] Kernel panic - not syncing: Fatal exception [ 32.549354] Dumping ftrace buffer: [ 32.552897] (ftrace buffer empty) [ 32.556587] Kernel Offset: disabled [ 32.560194] Rebooting in 86400 seconds..