[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   19.664345] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.
[   19.774379] random: sshd: uninitialized urandom read (32 bytes read)
[   19.997945] random: sshd: uninitialized urandom read (32 bytes read)
[   20.800191] random: sshd: uninitialized urandom read (32 bytes read)

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   20.960067] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.38' (ECDSA) to the list of known hosts.
[   26.408850] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   26.499382] WARNING: CPU: 0 PID: 4531 at mm/slab_common.c:996 kmalloc_slab+0x56/0x70
[   26.507292] Kernel panic - not syncing: panic_on_warn set ...
[   26.507292] 
[   26.514646] CPU: 0 PID: 4531 Comm: syz-executor594 Not tainted 4.17.0-rc3+ #9
[   26.521901] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   26.531237] Call Trace:
[   26.533814]  dump_stack+0x1b9/0x294
[   26.537427]  ? dump_stack_print_info.cold.2+0x52/0x52
[   26.542640]  ? slab_caches_to_rcu_destroy_workfn+0x70/0xc0
[   26.548252]  panic+0x22f/0x4de
[   26.551433]  ? add_taint.cold.5+0x16/0x16
[   26.555568]  ? __warn.cold.8+0x148/0x1b3
[   26.559618]  ? __warn.cold.8+0x117/0x1b3
[   26.563667]  ? kmalloc_slab+0x56/0x70
[   26.567449]  __warn.cold.8+0x163/0x1b3
[   26.571320]  ? kmalloc_slab+0x56/0x70
[   26.575107]  report_bug+0x252/0x2d0
[   26.578720]  do_error_trap+0x1de/0x490
[   26.582591]  ? math_error+0x420/0x420
[   26.586374]  ? graph_lock+0x170/0x170
[   26.590162]  ? reverse_path_check_proc.cold.21+0x1f/0x1f
[   26.595603]  ? get_unused_fd_flags+0x121/0x190
[   26.600169]  ? __alloc_fd+0x700/0x700
[   26.603973]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   26.608799]  do_invalid_op+0x1b/0x20
[   26.612512]  invalid_op+0x14/0x20
[   26.615959] RIP: 0010:kmalloc_slab+0x56/0x70
[   26.620344] RSP: 0018:ffff8801ad4b7c48 EFLAGS: 00010246
[   26.625697] RAX: 0000000000000000 RBX: fffffffffffffff4 RCX: ffffffff8185e678
[   26.632960] RDX: ffffffff8185e6eb RSI: 0000000000000000 RDI: 00000000fffffffd
[   26.640221] RBP: ffff8801ad4b7c48 R08: ffff8801adb3e2c0 R09: ffffed0035ba1f08
[   26.647486] R10: ffffed0035ba1f08 R11: ffff8801add0f843 R12: 00000000fffffffd
[   26.654740] R13: 0000000020000240 R14: 00000000ffffffff R15: 00000000014200c0
[   26.662015]  ? map_delete_elem+0x1a8/0x4e0
[   26.666248]  ? map_delete_elem+0x21b/0x4e0
[   26.670479]  __kmalloc_track_caller+0x21/0x760
[   26.675047]  ? __might_sleep+0x95/0x190
[   26.679003]  ? map_delete_elem+0x21b/0x4e0
[   26.683229]  memdup_user+0x2c/0xa0
[   26.686754]  map_delete_elem+0x21b/0x4e0
[   26.690802]  __x64_sys_bpf+0x33f/0x4f0
[   26.694672]  ? bpf_prog_get+0x20/0x20
[   26.698460]  ? do_syscall_64+0x92/0x800
[   26.702431]  do_syscall_64+0x1b1/0x800
[   26.706302]  ? syscall_return_slowpath+0x5c0/0x5c0
[   26.711215]  ? syscall_return_slowpath+0x30f/0x5c0
[   26.716131]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   26.721486]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   26.726324]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   26.731494] RIP: 0033:0x43fd89
[   26.734667] RSP: 002b:00007ffe3ad9ad78 EFLAGS: 00000213 ORIG_RAX: 0000000000000141
[   26.742363] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd89
[   26.749612] RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000003
[   26.756862] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
[   26.764117] R10: 00000000004002c8 R11: 0000000000000213 R12: 00000000004016b0
[   26.771379] R13: 0000000000401740 R14: 0000000000000000 R15: 0000000000000000
[   26.779302] Dumping ftrace buffer:
[   26.782927]    (ftrace buffer empty)
[   26.786622] Kernel Offset: disabled
[   26.790234] Rebooting in 86400 seconds..