[....] Starting OpenBSD Secure Shell server: sshd[   21.006897] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   24.794953] random: sshd: uninitialized urandom read (32 bytes read)
[   25.066573] sshd (4452) used greatest stack depth: 16776 bytes left
[   25.083291] random: sshd: uninitialized urandom read (32 bytes read)
[   25.766233] random: sshd: uninitialized urandom read (32 bytes read)
[   54.223990] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts.
[   59.671193] random: sshd: uninitialized urandom read (32 bytes read)
2018/04/29 03:09:54 parsed 1 programs
2018/04/29 03:09:54 executed programs: 0
[   60.136813] IPVS: ftp: loaded support on port[0] = 21
[   65.094052] kasan: CONFIG_KASAN_INLINE enabled
[   65.098857] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   65.106296] general protection fault: 0000 [#1] SMP KASAN
[   65.111824] Dumping ftrace buffer:
[   65.115343]    (ftrace buffer empty)
[   65.119036] Modules linked in:
[   65.122209] CPU: 0 PID: 5238 Comm: syz-executor0 Not tainted 4.17.0-rc2+ #47
[   65.129371] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   65.138714] RIP: 0010:__radix_tree_delete+0x74/0x230
[   65.143790] RSP: 0018:ffff8801b743f168 EFLAGS: 00010246
[   65.149131] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 1ffff10036e87e4a
[   65.156393] RDX: 0000000000000000 RSI: ffffffff8768eeed RDI: ffff8801aad8f5a8
[   65.163642] RBP: ffff8801b743f208 R08: ffff8801adc3a1c0 R09: ffffed00355b1e99
[   65.170895] R10: ffff8801b743f318 R11: ffff8801aad8f4cf R12: 0000000000000000
[   65.178145] R13: ffff8801aad8f5a8 R14: 0000000000000001 R15: ffff8801b743f290
[   65.185405] FS:  0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000f7f8cb40
[   65.193611] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[   65.199470] CR2: 00007f3e13e9d000 CR3: 00000001b3e5f000 CR4: 00000000001426f0
[   65.206721] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   65.213968] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   65.221218] Call Trace:
[   65.223791]  ? find_held_lock+0x36/0x1c0
[   65.227832]  ? radix_tree_tag_clear+0x490/0x490
[   65.232481]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   65.238012]  radix_tree_delete_item+0x148/0x2d0
[   65.242665]  ? radix_tree_lookup+0x30/0x30
[   65.246889]  ? retint_kernel+0x10/0x10
[   65.250767]  idr_remove+0x46/0x60
[   65.254199]  kvm_vm_ioctl_hv_eventfd+0x1df/0x24b
[   65.258936]  kvm_arch_vm_ioctl+0x155e/0x2690
[   65.263322]  ? print_usage_bug+0xc0/0xc0
[   65.267362]  ? kvm_vm_ioctl_irq_line+0x160/0x160
[   65.272094]  ? lock_downgrade+0x8e0/0x8e0
[   65.276218]  ? lock_downgrade+0x8e0/0x8e0
[   65.280348]  ? kasan_check_read+0x11/0x20
[   65.284473]  ? graph_lock+0x170/0x170
[   65.288252]  ? do_raw_spin_trylock+0x1b0/0x1b0
[   65.292814]  ? trace_hardirqs_on+0xd/0x10
[   65.296945]  ? graph_lock+0x170/0x170
[   65.300738]  ? __lock_is_held+0xb5/0x140
[   65.304792]  ? print_usage_bug+0xc0/0xc0
[   65.308831]  ? debug_check_no_locks_freed+0x310/0x310
[   65.314000]  ? __lock_is_held+0xb5/0x140
[   65.318046]  ? __account_cfs_rq_runtime+0x600/0x600
[   65.323045]  ? __lock_acquire+0x7f5/0x5140
[   65.327257]  ? update_load_avg+0x2570/0x2570
[   65.331657]  ? __enqueue_entity+0x10d/0x1f0
[   65.335972]  ? debug_check_no_locks_freed+0x310/0x310
[   65.341140]  ? pick_next_task_fair+0x973/0x1660
[   65.345794]  kvm_vm_ioctl+0x246/0x1d90
[   65.349669]  ? find_held_lock+0x36/0x1c0
[   65.353717]  ? kvm_set_memory_region+0x50/0x50
[   65.358287]  ? lock_downgrade+0x8e0/0x8e0
[   65.362417]  ? finish_task_switch+0x182/0x810
[   65.366901]  ? kasan_check_read+0x11/0x20
[   65.371038]  ? do_raw_spin_unlock+0x9e/0x2e0
[   65.375426]  ? graph_lock+0x170/0x170
[   65.379208]  ? compat_start_thread+0x80/0x80
[   65.383596]  ? _raw_spin_unlock_irq+0x27/0x70
[   65.388072]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   65.393078]  ? trace_hardirqs_on+0xd/0x10
[   65.397208]  ? _raw_spin_unlock_irq+0x27/0x70
[   65.401683]  ? find_held_lock+0x36/0x1c0
[   65.405741]  ? lock_downgrade+0x8e0/0x8e0
[   65.409876]  ? kasan_check_read+0x11/0x20
[   65.414005]  ? rcu_is_watching+0x85/0x140
[   65.418140]  ? rcu_bh_force_quiescent_state+0x20/0x20
[   65.423311]  ? __fget+0x40c/0x650
[   65.426744]  ? expand_files.part.8+0x9a0/0x9a0
[   65.431305]  ? __sanitizer_cov_trace_switch+0x53/0x90
[   65.436478]  ? __do_compat_sys_rt_sigtimedwait+0x1f0/0x1f0
[   65.442083]  ? __fget_light+0x2ef/0x430
[   65.446044]  kvm_vm_compat_ioctl+0x13b/0x420
[   65.450431]  ? kvm_vm_ioctl+0x1d90/0x1d90
[   65.454560]  ? __ia32_compat_sys_futex+0x3de/0x5e0
[   65.459475]  ? exit_to_usermode_loop+0x87/0x310
[   65.464136]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   65.469653]  ? __sanitizer_cov_trace_switch+0x53/0x90
[   65.474821]  ? kvm_vm_ioctl+0x1d90/0x1d90
[   65.478954]  __ia32_compat_sys_ioctl+0x221/0x640
[   65.483701]  do_fast_syscall_32+0x345/0xf9b
[   65.488001]  ? do_int80_syscall_32+0x880/0x880
[   65.492576]  ? _raw_spin_unlock_irq+0x27/0x70
[   65.497053]  ? finish_task_switch+0x1ca/0x810
[   65.501638]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   65.507163]  ? syscall_return_slowpath+0x30f/0x5c0
[   65.512073]  ? sysret32_from_system_call+0x5/0x46
[   65.516910]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   65.521734]  entry_SYSENTER_compat+0x70/0x7f
[   65.526121] RIP: 0023:0xf7f90cb9
[   65.529460] RSP: 002b:00000000f7f8c0ac EFLAGS: 00000282 ORIG_RAX: 0000000000000036
[   65.537148] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000004018aebd
[   65.544394] RDX: 0000000020000140 RSI: 0000000000000000 RDI: 0000000000000000
[   65.551640] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[   65.558890] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[   65.566138] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[   65.573390] Code: 3f 9a 88 48 c7 45 88 80 ee 68 87 c7 00 f1 f1 f1 f1 c7 40 04 00 f2 f2 f2 c7 40 08 f3 f3 f3 f3 e8 a3 51 10 fa 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 0f 85 97 01 00 00 48 8d 55 d8 4c 8d 7a c0 49 8b 1e 
[   65.592534] RIP: __radix_tree_delete+0x74/0x230 RSP: ffff8801b743f168
[   65.599189] ---[ end trace 6309f78fa95a1bfd ]---
[   65.603976] Kernel panic - not syncing: Fatal exception
[   65.609855] Dumping ftrace buffer:
[   65.613387]    (ftrace buffer empty)
[   65.617072] Kernel Offset: disabled
[   65.620677] Rebooting in 86400 seconds..