[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   19.796112] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   21.618314] random: sshd: uninitialized urandom read (32 bytes read)
[   21.930255] random: sshd: uninitialized urandom read (32 bytes read)
[   22.675571] random: sshd: uninitialized urandom read (32 bytes read)
[   22.856812] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts.
[   28.380114] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   28.475010] kasan: CONFIG_KASAN_INLINE enabled
[   28.479737] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   28.487135] general protection fault: 0000 [#1] SMP KASAN
[   28.492670] Dumping ftrace buffer:
[   28.496186]    (ftrace buffer empty)
[   28.499873] Modules linked in:
[   28.503095] CPU: 0 PID: 4503 Comm: syz-executor192 Not tainted 4.17.0-rc2+ #16
[   28.510427] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   28.519769] RIP: 0010:smc_set_keepalive+0x4e/0xd0
[   28.524598] RSP: 0018:ffff8801ad9ffa68 EFLAGS: 00010202
[   28.529937] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff85d68bcb
[   28.537185] RDX: 0000000000000004 RSI: ffffffff873e68c4 RDI: 0000000000000020
[   28.544436] RBP: ffff8801ad9ffa80 R08: ffff8801ad6500c0 R09: 0000000000000006
[   28.551692] R10: ffff8801ad6500c0 R11: 0000000000000000 R12: ffff8801ad7887c0
[   28.558941] R13: 0000000000000001 R14: 0000000000000003 R15: ffff8801a8295940
[   28.566189] FS:  0000000001c41880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
[   28.574389] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   28.580246] CR2: 0000000020000040 CR3: 00000001ad1b5000 CR4: 00000000001406f0
[   28.587492] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   28.594744] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   28.601992] Call Trace:
[   28.604568]  ? calipso_cache_add+0x140/0x140
[   28.608962]  sock_setsockopt+0x14e2/0x1f40
[   28.613178]  ? sock_enable_timestamp+0xe0/0xe0
[   28.617743]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   28.623262]  ? __fget_light+0x2ef/0x430
[   28.627215]  ? fget_raw+0x20/0x20
[   28.630658]  ? lock_downgrade+0x8e0/0x8e0
[   28.634783]  ? handle_mm_fault+0x8c0/0xc70
[   28.639003]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   28.644526]  ? handle_mm_fault+0x55a/0xc70
[   28.648744]  ? security_socket_setsockopt+0x94/0xc0
[   28.653737]  __sys_setsockopt+0x2df/0x390
[   28.657861]  ? kernel_accept+0x310/0x310
[   28.661898]  ? mm_fault_error+0x380/0x380
[   28.666030]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   28.671546]  ? syscall_slow_exit_work+0x4f0/0x4f0
[   28.676368]  __x64_sys_setsockopt+0xbe/0x150
[   28.680763]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   28.685760]  do_syscall_64+0x1b1/0x800
[   28.689624]  ? syscall_return_slowpath+0x5c0/0x5c0
[   28.694534]  ? syscall_return_slowpath+0x30f/0x5c0
[   28.699445]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   28.704958]  ? retint_user+0x18/0x18
[   28.708652]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   28.713472]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   28.718642] RIP: 0033:0x43fcf9
[   28.721808] RSP: 002b:00007ffd1b6cadf8 EFLAGS: 00000217 ORIG_RAX: 0000000000000036
[   28.729493] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcf9
[   28.736736] RDX: 0000000000000009 RSI: 0000000000000001 RDI: 0000000000000003
[   28.744076] RBP: 00000000006ca018 R08: 0000000000000004 R09: 00000000004002c8
[   28.751321] R10: 0000000020000040 R11: 0000000000000217 R12: 0000000000401620
[   28.758566] R13: 00000000004016b0 R14: 0000000000000000 R15: 0000000000000000
[   28.766278] Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 78 48 8b 9b 50 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 20 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 6b 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 20 48 
[   28.785413] RIP: smc_set_keepalive+0x4e/0xd0 RSP: ffff8801ad9ffa68
[   28.791827] ---[ end trace a8cfbe2f3bb43877 ]---
[   28.796605] Kernel panic - not syncing: Fatal exception
[   28.802425] Dumping ftrace buffer:
[   28.805941]    (ftrace buffer empty)
[   28.809630] Kernel Offset: disabled
[   28.813233] Rebooting in 86400 seconds..