[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.710610] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.991323] random: sshd: uninitialized urandom read (32 bytes read) [ 23.316403] random: sshd: uninitialized urandom read (32 bytes read) [ 24.122563] random: sshd: uninitialized urandom read (32 bytes read) [ 24.284213] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.18' (ECDSA) to the list of known hosts. [ 29.739162] random: sshd: uninitialized urandom read (32 bytes read) [ 29.830826] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 29.838855] PGD 1acee0067 P4D 1acee0067 PUD 1d96ef067 PMD 0 [ 29.844649] Oops: 0010 [#1] SMP KASAN [ 29.848433] CPU: 0 PID: 4568 Comm: syz-executor600 Not tainted 4.17.0+ #83 [ 29.855420] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.864753] RIP: 0010: (null) [ 29.868617] Code: Bad RIP value. [ 29.871986] RSP: 0018:ffff8801d8c67590 EFLAGS: 00010246 [ 29.877349] RAX: 0000000000000000 RBX: ffff8801d9280800 RCX: 1ffffffff10ea785 [ 29.884615] RDX: ffff8801d8c67ab0 RSI: ffff8801a8e8a200 RDI: ffff8801d91430c0 [ 29.891864] RBP: ffff8801d8c67700 R08: 0000000000000001 R09: 0000000000000000 [ 29.899124] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1003b18ceb7 [ 29.906382] R13: ffff8801d8c67ab0 R14: ffff8801d9280812 R15: ffff8801d9280c58 [ 29.913633] FS: 00000000019ad880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 29.921842] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.927704] CR2: ffffffffffffffd6 CR3: 00000001d90a6000 CR4: 00000000001406f0 [ 29.934975] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.942224] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.949473] Call Trace: [ 29.952049] ? smc_poll+0x211/0xdd0 [ 29.955657] ? __smc_connect+0xa90/0xa90 [ 29.959700] ? kvm_clock_read+0x25/0x30 [ 29.963654] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.969170] ? ktime_get_ts64+0x39d/0x510 [ 29.973297] ? do_gettimeofday+0x170/0x170 [ 29.977515] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.983039] ? __fget_light+0x2ef/0x430 [ 29.987012] sock_poll+0x1d1/0x710 [ 29.990544] ? __smc_connect+0xa90/0xa90 [ 29.994585] ? sock_get_poll_head+0x460/0x460 [ 29.999060] ? sock_get_poll_head+0x460/0x460 [ 30.003544] vfs_poll+0x77/0x2a0 [ 30.006902] do_sys_poll+0x6fd/0x1100 [ 30.010688] ? compat_core_sys_select+0xae0/0xae0 [ 30.015511] ? find_held_lock+0x36/0x1c0 [ 30.019552] ? debug_mutex_init+0x1c/0x60 [ 30.023692] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.028687] ? graph_lock+0x170/0x170 [ 30.032468] ? graph_lock+0x170/0x170 [ 30.036259] ? debug_mutex_init+0x2d/0x60 [ 30.040397] ? __mutex_init+0x1ef/0x280 [ 30.044363] ? find_held_lock+0x36/0x1c0 [ 30.048406] ? poll_initwait+0x180/0x180 [ 30.052462] ? pvclock_read_flags+0x160/0x160 [ 30.056958] ? ktime_get_ts64+0x405/0x510 [ 30.061087] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 30.066084] ? timespec64_add_safe+0x1f4/0x2d0 [ 30.070660] ? nsec_to_clock_t+0x30/0x30 [ 30.074705] ? do_gettimeofday+0x170/0x170 [ 30.078924] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.084449] ? sock_alloc_file+0x2a4/0x4e0 [ 30.088672] ? sock_release+0x1b0/0x1b0 [ 30.092632] ? get_unused_fd_flags+0x121/0x190 [ 30.097208] ? poll_select_set_timeout+0x14f/0x220 [ 30.102121] ? do_restart_poll+0x2d0/0x2d0 [ 30.106336] ? fd_install+0x4d/0x60 [ 30.109945] ? __sys_socket+0x19f/0x250 [ 30.113915] __x64_sys_poll+0x189/0x510 [ 30.117890] ? __ia32_sys_pselect6+0x270/0x270 [ 30.122457] ? do_syscall_64+0x92/0x800 [ 30.126412] do_syscall_64+0x1b1/0x800 [ 30.130282] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.135117] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.140042] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.144967] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.150317] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.155151] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.160326] RIP: 0033:0x43fcd9 [ 30.163494] 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 [ 30.182618] RSP: 002b:00007ffd5cc37ab8 EFLAGS: 00000213 ORIG_RAX: 0000000000000007 [ 30.190309] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcd9 [ 30.197558] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000020000040 [ 30.204809] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 30.212060] R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000401600 [ 30.219321] R13: 0000000000401690 R14: 0000000000000000 R15: 0000000000000000 [ 30.226577] Modules linked in: [ 30.229758] Dumping ftrace buffer: [ 30.233274] (ftrace buffer empty) [ 30.236973] CR2: 0000000000000000 [ 30.240637] ---[ end trace 7032741926dd0687 ]--- [ 30.245416] RIP: 0010: (null) [ 30.249311] Code: Bad RIP value. [ 30.252710] RSP: 0018:ffff8801d8c67590 EFLAGS: 00010246 [ 30.258093] RAX: 0000000000000000 RBX: ffff8801d9280800 RCX: 1ffffffff10ea785 [ 30.265371] RDX: ffff8801d8c67ab0 RSI: ffff8801a8e8a200 RDI: ffff8801d91430c0 [ 30.272645] RBP: ffff8801d8c67700 R08: 0000000000000001 R09: 0000000000000000 [ 30.279944] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1003b18ceb7 [ 30.287232] R13: ffff8801d8c67ab0 R14: ffff8801d9280812 R15: ffff8801d9280c58 [ 30.294518] FS: 00000000019ad880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 30.302759] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.308644] CR2: ffffffffffffffd6 CR3: 00000001d90a6000 CR4: 00000000001406f0 [ 30.315925] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.323205] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.330480] Kernel panic - not syncing: Fatal exception [ 30.336392] Dumping ftrace buffer: [ 30.339915] (ftrace buffer empty) [ 30.343602] Kernel Offset: disabled [ 30.347215] Rebooting in 86400 seconds..