[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   18.864356] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   20.696398] random: sshd: uninitialized urandom read (32 bytes read)
[   20.917949] random: sshd: uninitialized urandom read (32 bytes read)
[   21.617516] random: sshd: uninitialized urandom read (32 bytes read)
[   24.124436] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.43' (ECDSA) to the list of known hosts.
[   29.555935] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   29.662575] kasan: CONFIG_KASAN_INLINE enabled
[   29.667275] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   29.674692] general protection fault: 0000 [#1] SMP KASAN
[   29.680220] Dumping ftrace buffer:
[   29.683738]    (ftrace buffer empty)
[   29.687423] Modules linked in:
[   29.690595] CPU: 0 PID: 4452 Comm: syz-executor014 Not tainted 4.17.0-rc2+ #19
[   29.697928] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   29.707271] RIP: 0010:smc_set_keepalive+0x4e/0xd0
[   29.712087] RSP: 0018:ffff8801b4effa68 EFLAGS: 00010202
[   29.717426] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff85d68bcb
[   29.724672] RDX: 0000000000000004 RSI: ffffffff873e68c4 RDI: 0000000000000020
[   29.731916] RBP: ffff8801b4effa80 R08: ffff8801b49b8740 R09: 0000000000000006
[   29.739170] R10: ffff8801b49b8740 R11: 0000000000000000 R12: ffff8801b4f9b7c0
[   29.746418] R13: 0000000000000001 R14: 0000000000000003 R15: ffff8801ae2055c0
[   29.753669] FS:  0000000000f6d880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
[   29.761880] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   29.767736] CR2: 0000000020000040 CR3: 00000001b482f000 CR4: 00000000001406f0
[   29.774984] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   29.782233] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   29.789478] Call Trace:
[   29.792060]  ? calipso_cache_add+0x140/0x140
[   29.796452]  sock_setsockopt+0x14e2/0x1f40
[   29.800667]  ? sock_enable_timestamp+0xe0/0xe0
[   29.805236]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   29.810751]  ? __fget_light+0x2ef/0x430
[   29.814703]  ? fget_raw+0x20/0x20
[   29.818139]  ? lock_downgrade+0x8e0/0x8e0
[   29.822263]  ? handle_mm_fault+0x8c0/0xc70
[   29.826481]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   29.831996]  ? handle_mm_fault+0x55a/0xc70
[   29.836218]  ? security_socket_setsockopt+0x94/0xc0
[   29.841218]  __sys_setsockopt+0x2df/0x390
[   29.845349]  ? kernel_accept+0x310/0x310
[   29.849388]  ? mm_fault_error+0x380/0x380
[   29.853518]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   29.859043]  ? syscall_slow_exit_work+0x4f0/0x4f0
[   29.863863]  __x64_sys_setsockopt+0xbe/0x150
[   29.868247]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   29.873239]  do_syscall_64+0x1b1/0x800
[   29.877103]  ? syscall_slow_exit_work+0x4f0/0x4f0
[   29.881928]  ? syscall_return_slowpath+0x5c0/0x5c0
[   29.886839]  ? syscall_return_slowpath+0x30f/0x5c0
[   29.891749]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   29.897264]  ? retint_user+0x18/0x18
[   29.900956]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   29.905778]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   29.910943] RIP: 0033:0x43fcf9
[   29.914107] RSP: 002b:00007ffd725fd188 EFLAGS: 00000217 ORIG_RAX: 0000000000000036
[   29.921804] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcf9
[   29.929048] RDX: 0000000000000009 RSI: 0000000000000001 RDI: 0000000000000003
[   29.936294] RBP: 00000000006ca018 R08: 0000000000000004 R09: 00000000004002c8
[   29.943545] R10: 0000000020000040 R11: 0000000000000217 R12: 0000000000401620
[   29.950798] R13: 00000000004016b0 R14: 0000000000000000 R15: 0000000000000000
[   29.958044] 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 
[   29.977190] RIP: smc_set_keepalive+0x4e/0xd0 RSP: ffff8801b4effa68
[   29.983586] ---[ end trace fd4053905e5579ec ]---
[   29.988358] Kernel panic - not syncing: Fatal exception
[   29.994187] Dumping ftrace buffer:
[   29.997708]    (ftrace buffer empty)
[   30.001394] Kernel Offset: disabled
[   30.004996] Rebooting in 86400 seconds..