[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.812438] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.090885] random: sshd: uninitialized urandom read (32 bytes read) [ 20.456855] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.257263] random: sshd: uninitialized urandom read (32 bytes read) [ 21.425727] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. [ 26.914464] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.006280] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 27.014297] PGD 1ada8d067 P4D 1ada8d067 PUD 1acf6a067 PMD 0 [ 27.020089] Oops: 0010 [#1] SMP KASAN [ 27.023870] CPU: 1 PID: 4517 Comm: syz-executor067 Not tainted 4.18.0-rc2+ #121 [ 27.031301] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.040635] RIP: 0010: (null) [ 27.044508] Code: Bad RIP value. [ 27.047870] RSP: 0018:ffff8801bf28f758 EFLAGS: 00010246 [ 27.053228] RAX: 0000000000000000 RBX: ffff8801a7f2c480 RCX: ffffffff85ec9112 [ 27.060477] RDX: ffff8801bf28fab0 RSI: ffff8801a7f2c480 RDI: ffff8801ac173300 [ 27.067728] RBP: ffff8801bf28f800 R08: ffff8801ac034040 R09: ffffed003b1ce678 [ 27.074976] R10: ffffed003b1ce678 R11: ffff8801d8e733c3 R12: ffff8801bf28fab0 [ 27.082226] R13: ffff8801ac173300 R14: ffffffff8818a920 R15: ffff8801d9788e00 [ 27.089484] FS: 00000000011f2880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 27.097692] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.103565] CR2: ffffffffffffffd6 CR3: 00000001ac15d000 CR4: 00000000001406e0 [ 27.110834] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.118103] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.125366] Call Trace: [ 27.127936] ? sock_poll+0x2e1/0x490 [ 27.131632] ? kernel_sendpage_locked+0x120/0x120 [ 27.136454] ? kernel_sendpage_locked+0x120/0x120 [ 27.141277] do_sys_poll+0x74d/0x1180 [ 27.145065] ? compat_core_sys_select+0xb10/0xb10 [ 27.149890] ? __thp_get_unmapped_area+0x180/0x180 [ 27.154805] ? graph_lock+0x170/0x170 [ 27.158613] ? graph_lock+0x170/0x170 [ 27.162400] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.167919] ? find_held_lock+0x36/0x1c0 [ 27.171959] ? poll_initwait+0x180/0x180 [ 27.176009] ? pvclock_read_flags+0x160/0x160 [ 27.180506] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 27.185504] ? timespec64_add_safe+0x204/0x2f0 [ 27.190069] ? nsec_to_clock_t+0x30/0x30 [ 27.194120] ? do_gettimeofday+0x180/0x180 [ 27.198348] ? poll_select_set_timeout+0x156/0x240 [ 27.203265] ? do_restart_poll+0x2e0/0x2e0 [ 27.207490] __x64_sys_poll+0x197/0x530 [ 27.211443] ? __ia32_sys_pselect6+0x270/0x270 [ 27.216022] ? do_syscall_64+0x9a/0x820 [ 27.220013] do_syscall_64+0x1b9/0x820 [ 27.223891] ? syscall_return_slowpath+0x5e0/0x5e0 [ 27.228801] ? syscall_return_slowpath+0x31d/0x5e0 [ 27.233710] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.239229] ? retint_user+0x18/0x18 [ 27.242923] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.247746] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.252916] RIP: 0033:0x43fd09 [ 27.256084] 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 [ 27.275204] RSP: 002b:00007ffdadf7d328 EFLAGS: 00000213 ORIG_RAX: 0000000000000007 [ 27.282902] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd09 [ 27.290163] RDX: 0000000000000006 RSI: 0000000000000003 RDI: 0000000020003900 [ 27.297412] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 27.304660] R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000401630 [ 27.311907] R13: 00000000004016c0 R14: 0000000000000000 R15: 0000000000000000 [ 27.319166] Modules linked in: [ 27.322339] Dumping ftrace buffer: [ 27.325854] (ftrace buffer empty) [ 27.329543] CR2: 0000000000000000 [ 27.333061] ---[ end trace d5594dfe4edf34f4 ]--- [ 27.337824] RIP: 0010: (null) [ 27.341721] Code: Bad RIP value. [ 27.345107] RSP: 0018:ffff8801bf28f758 EFLAGS: 00010246 [ 27.350479] RAX: 0000000000000000 RBX: ffff8801a7f2c480 RCX: ffffffff85ec9112 [ 27.357776] RDX: ffff8801bf28fab0 RSI: ffff8801a7f2c480 RDI: ffff8801ac173300 [ 27.365055] RBP: ffff8801bf28f800 R08: ffff8801ac034040 R09: ffffed003b1ce678 [ 27.372343] R10: ffffed003b1ce678 R11: ffff8801d8e733c3 R12: ffff8801bf28fab0 [ 27.379626] R13: ffff8801ac173300 R14: ffffffff8818a920 R15: ffff8801d9788e00 [ 27.386912] FS: 00000000011f2880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 27.395142] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.401037] CR2: ffffffffffffffd6 CR3: 00000001ac15d000 CR4: 00000000001406e0 [ 27.408318] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.415589] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.422869] Kernel panic - not syncing: Fatal exception [ 27.428701] Dumping ftrace buffer: [ 27.432233] (ftrace buffer empty) [ 27.435918] Kernel Offset: disabled [ 27.439526] Rebooting in 86400 seconds..