[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   20.531997] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.144337] random: sshd: uninitialized urandom read (32 bytes read)
[   23.385321] random: sshd: uninitialized urandom read (32 bytes read)
[   24.156535] random: sshd: uninitialized urandom read (32 bytes read)
[   28.554290] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.46' (ECDSA) to the list of known hosts.
[   34.036855] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   34.130850] kasan: CONFIG_KASAN_INLINE enabled
[   34.135581] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   34.142966] general protection fault: 0000 [#1] SMP KASAN
[   34.148511] Dumping ftrace buffer:
[   34.152033]    (ftrace buffer empty)
[   34.155725] Modules linked in:
[   34.158901] CPU: 0 PID: 4549 Comm: syz-executor817 Not tainted 4.17.0-rc4+ #55
[   34.166235] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   34.175581] RIP: 0010:smc_ioctl+0x3dc/0x9f0
[   34.179878] RSP: 0018:ffff8801acfbf770 EFLAGS: 00010202
[   34.185218] RAX: dffffc0000000000 RBX: ffff8801d8f3d7c0 RCX: ffffffff87411b3f
[   34.192472] RDX: 0000000000000004 RSI: ffffffff87411b4e RDI: 0000000000000020
[   34.199984] RBP: ffff8801acfbf9d0 R08: ffff8801d893e6c0 R09: ffffed003b1a3b80
[   34.207233] R10: ffffed003b1a3b80 R11: ffff8801d8d1dc03 R12: 1ffff100359f7ef1
[   34.214481] R13: 0000000020000000 R14: 0000000000000000 R15: 0000000000000000
[   34.221740] FS:  0000000001a75880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
[   34.229942] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   34.235900] CR2: 00007ffc7b5e0038 CR3: 00000001acb39000 CR4: 00000000001406f0
[   34.243152] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   34.250404] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   34.257651] Call Trace:
[   34.260225]  ? smc_shutdown+0x5c0/0x5c0
[   34.264185]  ? debug_check_no_locks_freed+0x310/0x310
[   34.269360]  ? save_stack+0xa9/0xd0
[   34.272983]  ? save_stack+0x43/0xd0
[   34.276610]  ? kasan_kmalloc+0xc4/0xe0
[   34.280478]  ? kasan_slab_alloc+0x12/0x20
[   34.284617]  ? kmem_cache_alloc+0x12e/0x760
[   34.288918]  ? get_empty_filp+0x125/0x520
[   34.293046]  ? alloc_file+0x24/0x3e0
[   34.296742]  ? sock_alloc_file+0x1f3/0x4e0
[   34.300954]  ? __sys_socket+0x16f/0x250
[   34.304914]  ? __x64_sys_socket+0x73/0xb0
[   34.309048]  ? do_syscall_64+0x1b1/0x800
[   34.313093]  ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   34.318439]  ? find_held_lock+0x36/0x1c0
[   34.322489]  ? debug_mutex_init+0x1c/0x60
[   34.326616]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   34.331610]  ? graph_lock+0x170/0x170
[   34.335388]  ? lockdep_init_map+0x9/0x10
[   34.339431]  sock_do_ioctl+0xe4/0x3e0
[   34.343212]  ? compat_ifr_data_ioctl+0x170/0x170
[   34.347945]  ? find_held_lock+0x36/0x1c0
[   34.351986]  ? lock_downgrade+0x8e0/0x8e0
[   34.356115]  ? __sanitizer_cov_trace_switch+0x53/0x90
[   34.361287]  sock_ioctl+0x30d/0x680
[   34.364897]  ? rcu_bh_force_quiescent_state+0x20/0x20
[   34.370073]  ? dlci_ioctl_set+0x40/0x40
[   34.374036]  ? __fd_install+0x2de/0x880
[   34.377996]  ? get_unused_fd_flags+0x190/0x190
[   34.382562]  ? dlci_ioctl_set+0x40/0x40
[   34.386514]  do_vfs_ioctl+0x1cf/0x16a0
[   34.390381]  ? ioctl_preallocate+0x2e0/0x2e0
[   34.394767]  ? fget_raw+0x20/0x20
[   34.398209]  ? get_unused_fd_flags+0x121/0x190
[   34.402771]  ? __alloc_fd+0x700/0x700
[   34.406550]  ? fd_install+0x4d/0x60
[   34.410156]  ? __sys_socket+0x19f/0x250
[   34.414124]  ? security_file_ioctl+0x94/0xc0
[   34.418525]  ksys_ioctl+0xa9/0xd0
[   34.421957]  __x64_sys_ioctl+0x73/0xb0
[   34.425828]  do_syscall_64+0x1b1/0x800
[   34.429700]  ? syscall_return_slowpath+0x5c0/0x5c0
[   34.434609]  ? syscall_return_slowpath+0x30f/0x5c0
[   34.439526]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   34.444873]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   34.449699]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   34.454870] RIP: 0033:0x43fca9
[   34.458041] RSP: 002b:00007ffc7b40a4b8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010
[   34.465745] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fca9
[   34.473011] RDX: 0000000020000000 RSI: 0000000000005411 RDI: 0000000000000003
[   34.480266] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
[   34.487514] R10: 00000000004002c8 R11: 0000000000000213 R12: 00000000004015d0
[   34.494772] R13: 0000000000401660 R14: 0000000000000000 R15: 0000000000000000
[   34.502041] Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 7d 05 00 00 4c 8b b3 90 04 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7e 20 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 47 05 00 00 45 8b 7e 20 4c 
[   34.521239] RIP: smc_ioctl+0x3dc/0x9f0 RSP: ffff8801acfbf770
[   34.527918] ---[ end trace b777dab148ac1e6e ]---
[   34.532694] Kernel panic - not syncing: Fatal exception
[   34.538711] Dumping ftrace buffer:
[   34.542248]    (ftrace buffer empty)
[   34.545936] Kernel Offset: disabled
[   34.549542] Rebooting in 86400 seconds..