[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   19.356684] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.496498] random: sshd: uninitialized urandom read (32 bytes read)
[   23.998587] random: sshd: uninitialized urandom read (32 bytes read)
[   24.789847] random: sshd: uninitialized urandom read (32 bytes read)
[   24.946613] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts.
[   30.551381] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   30.638273] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
[   30.646295] PGD 1aec04067 P4D 1aec04067 PUD 1aed28067 PMD 0 
[   30.652085] Oops: 0010 [#1] SMP KASAN
[   30.655866] CPU: 0 PID: 4522 Comm: syz-executor146 Not tainted 4.18.0-rc2+ #121
[   30.663287] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   30.672630] RIP: 0010:          (null)
[   30.676496] Code: Bad RIP value.
[   30.679860] RSP: 0018:ffff8801c3dbf758 EFLAGS: 00010246
[   30.685206] RAX: 0000000000000000 RBX: ffff8801aa717a80 RCX: ffffffff85ec9112
[   30.692514] RDX: ffff8801c3dbfab0 RSI: ffff8801aa717a80 RDI: ffff8801b13a5040
[   30.699774] RBP: ffff8801c3dbf800 R08: ffff8801aec18040 R09: ffffed0035ffd000
[   30.707020] R10: ffffed0035ffd000 R11: ffff8801affe8003 R12: ffff8801c3dbfab0
[   30.714268] R13: ffff8801b13a5040 R14: ffffffff8818a920 R15: ffff8801ae4c2980
[   30.721524] FS:  00000000009a6880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
[   30.729749] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   30.735611] CR2: ffffffffffffffd6 CR3: 00000001af185000 CR4: 00000000001406f0
[   30.742863] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   30.750108] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   30.757357] Call Trace:
[   30.759939]  ? sock_poll+0x2e1/0x490
[   30.763633]  ? kernel_sendpage_locked+0x120/0x120
[   30.768468]  ? kernel_sendpage_locked+0x120/0x120
[   30.773302]  do_sys_poll+0x74d/0x1180
[   30.777100]  ? compat_core_sys_select+0xb10/0xb10
[   30.781923]  ? __thp_get_unmapped_area+0x180/0x180
[   30.786845]  ? graph_lock+0x170/0x170
[   30.790631]  ? graph_lock+0x170/0x170
[   30.794506]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   30.800022]  ? find_held_lock+0x36/0x1c0
[   30.804080]  ? poll_initwait+0x180/0x180
[   30.808125]  ? pvclock_read_flags+0x160/0x160
[   30.812878]  ? __sanitizer_cov_trace_cmp8+0x18/0x20
[   30.817887]  ? timespec64_add_safe+0x204/0x2f0
[   30.822446]  ? nsec_to_clock_t+0x30/0x30
[   30.826487]  ? do_gettimeofday+0x180/0x180
[   30.830713]  ? poll_select_set_timeout+0x156/0x240
[   30.835619]  ? do_restart_poll+0x2e0/0x2e0
[   30.839835]  __x64_sys_poll+0x197/0x530
[   30.843795]  ? __ia32_sys_pselect6+0x270/0x270
[   30.848354]  ? do_syscall_64+0x9a/0x820
[   30.852306]  do_syscall_64+0x1b9/0x820
[   30.856174]  ? syscall_slow_exit_work+0x500/0x500
[   30.860995]  ? syscall_return_slowpath+0x5e0/0x5e0
[   30.865905]  ? syscall_return_slowpath+0x31d/0x5e0
[   30.870816]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   30.876344]  ? retint_user+0x18/0x18
[   30.880036]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   30.884878]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   30.890046] RIP: 0033:0x43fd09
[   30.893219] 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 
[   30.912333] RSP: 002b:00007ffea215df98 EFLAGS: 00000213 ORIG_RAX: 0000000000000007
[   30.920031] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd09
[   30.927289] RDX: 0000000000000006 RSI: 0000000000000003 RDI: 0000000020003900
[   30.934548] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
[   30.941802] R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000401630
[   30.949051] R13: 00000000004016c0 R14: 0000000000000000 R15: 0000000000000000
[   30.956311] Modules linked in:
[   30.959484] Dumping ftrace buffer:
[   30.962998]    (ftrace buffer empty)
[   30.966690] CR2: 0000000000000000
[   30.970198] ---[ end trace 930be81983fe1d48 ]---
[   30.974955] RIP: 0010:          (null)
[   30.978839] Code: Bad RIP value.
[   30.982229] RSP: 0018:ffff8801c3dbf758 EFLAGS: 00010246
[   30.987604] RAX: 0000000000000000 RBX: ffff8801aa717a80 RCX: ffffffff85ec9112
[   30.995143] RDX: ffff8801c3dbfab0 RSI: ffff8801aa717a80 RDI: ffff8801b13a5040
[   31.002433] RBP: ffff8801c3dbf800 R08: ffff8801aec18040 R09: ffffed0035ffd000
[   31.009729] R10: ffffed0035ffd000 R11: ffff8801affe8003 R12: ffff8801c3dbfab0
[   31.016997] R13: ffff8801b13a5040 R14: ffffffff8818a920 R15: ffff8801ae4c2980
[   31.024282] FS:  00000000009a6880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
[   31.032506] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   31.038474] CR2: ffffffffffffffd6 CR3: 00000001af185000 CR4: 00000000001406f0
[   31.045885] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   31.053168] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   31.060451] Kernel panic - not syncing: Fatal exception
[   31.066464] Dumping ftrace buffer:
[   31.073143]    (ftrace buffer empty)
[   31.076835] Kernel Offset: disabled
[   31.080442] Rebooting in 86400 seconds..