[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   19.107571] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.090180] random: sshd: uninitialized urandom read (32 bytes read)
[   23.493691] random: sshd: uninitialized urandom read (32 bytes read)
[   24.263869] random: sshd: uninitialized urandom read (32 bytes read)
[   32.431810] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.20' (ECDSA) to the list of known hosts.
[   37.849688] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   37.945406] WARNING: CPU: 0 PID: 4499 at mm/slab_common.c:996 kmalloc_slab+0x56/0x70
[   37.953297] Kernel panic - not syncing: panic_on_warn set ...
[   37.953297] 
[   37.960637] CPU: 0 PID: 4499 Comm: syz-executor050 Not tainted 4.17.0-rc3+ #9
[   37.967883] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   37.977211] Call Trace:
[   37.979779]  dump_stack+0x1b9/0x294
[   37.983386]  ? dump_stack_print_info.cold.2+0x52/0x52
[   37.988558]  ? slab_caches_to_rcu_destroy_workfn+0x70/0xc0
[   37.994165]  panic+0x22f/0x4de
[   37.997337]  ? add_taint.cold.5+0x16/0x16
[   38.001464]  ? __warn.cold.8+0x148/0x1b3
[   38.005503]  ? __warn.cold.8+0x117/0x1b3
[   38.009543]  ? kmalloc_slab+0x56/0x70
[   38.013322]  __warn.cold.8+0x163/0x1b3
[   38.017186]  ? kmalloc_slab+0x56/0x70
[   38.020964]  report_bug+0x252/0x2d0
[   38.024567]  do_error_trap+0x1de/0x490
[   38.028432]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   38.033945]  ? math_error+0x420/0x420
[   38.037729]  ? graph_lock+0x170/0x170
[   38.041515]  ? reverse_path_check_proc.cold.21+0x1f/0x1f
[   38.046944]  ? get_unused_fd_flags+0x121/0x190
[   38.051501]  ? __alloc_fd+0x700/0x700
[   38.055287]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   38.060715]  do_invalid_op+0x1b/0x20
[   38.064406]  invalid_op+0x14/0x20
[   38.067838] RIP: 0010:kmalloc_slab+0x56/0x70
[   38.072218] RSP: 0018:ffff8801d907fc58 EFLAGS: 00010246
[   38.077559] RAX: 0000000000000000 RBX: ffff8801aeecb280 RCX: ffffffff8185ebd7
[   38.084811] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000ffffffe1
[   38.092058] RBP: ffff8801d907fc58 R08: ffff8801adb5e1c0 R09: ffffed0035a84700
[   38.099305] R10: ffffed0035a84700 R11: ffff8801ad423803 R12: ffff8801aeecb280
[   38.106551] R13: 00000000fffffff4 R14: ffff8801ad891a00 R15: 00000000014200c0
[   38.113806]  ? map_get_next_key+0x227/0x640
[   38.118111]  __kmalloc+0x25/0x760
[   38.121546]  ? __might_sleep+0x95/0x190
[   38.125495]  ? map_get_next_key+0x24a/0x640
[   38.129797]  map_get_next_key+0x24a/0x640
[   38.133925]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   38.139440]  __x64_sys_bpf+0x354/0x4f0
[   38.143302]  ? bpf_prog_get+0x20/0x20
[   38.147084]  ? do_syscall_64+0x92/0x800
[   38.151039]  do_syscall_64+0x1b1/0x800
[   38.154904]  ? syscall_return_slowpath+0x5c0/0x5c0
[   38.159811]  ? syscall_return_slowpath+0x30f/0x5c0
[   38.164717]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   38.170057]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   38.174877]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   38.180042] RIP: 0033:0x43fd89
[   38.183209] RSP: 002b:00007ffd6aab4668 EFLAGS: 00000213 ORIG_RAX: 0000000000000141
[   38.190899] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd89
[   38.198146] RDX: 0000000000000007 RSI: 0000000020000040 RDI: 0000000000000004
[   38.205389] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
[   38.212635] R10: 00000000004002c8 R11: 0000000000000213 R12: 00000000004016b0
[   38.219879] R13: 0000000000401740 R14: 0000000000000000 R15: 0000000000000000
[   38.227589] Dumping ftrace buffer:
[   38.231169]    (ftrace buffer empty)
[   38.234857] Kernel Offset: disabled
[   38.238462] Rebooting in 86400 seconds..