[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   19.149662] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   21.088625] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available)
[   21.405273] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available)
[   22.411457] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available)
[   22.575053] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available)
[   23.299301] random: nonblocking pool is initialized
Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts.
executing program
[   28.088044] kasan: CONFIG_KASAN_INLINE enabled
[   28.092472] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
[   28.105660] Dumping ftrace buffer:
[   28.109167]    (ftrace buffer empty)
[   28.112845] Modules linked in:
[   28.116119] CPU: 0 PID: 3733 Comm: syzkaller616720 Not tainted 4.4.124-g49632c6 #62
[   28.123877] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   28.133198] task: ffff8801c84de000 task.stack: ffff8801c80b8000
[   28.139221] RIP: 0010:[<ffffffff81434eb1>]  [<ffffffff81434eb1>] __free_pages+0x21/0x90
[   28.147452] RSP: 0018:ffff8801c80bfaa8  EFLAGS: 00010a07
[   28.152868] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825bb03b
[   28.160105] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c
[   28.167342] RBP: ffff8801c80bfab8 R08: 0000000000000001 R09: 0000000000000000
[   28.174587] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004
[   28.181824] R13: 0000000000000020 R14: ffff8801c87d0000 R15: dffffc0000000000
[   28.189064] FS:  0000000001656880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000
[   28.197256] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   28.203104] CR2: 0000000020eeafd7 CR3: 00000001c8d54000 CR4: 0000000000160670
[   28.210343] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   28.217584] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   28.224821] Stack:
[   28.226935]  0000000000000000 ffff8801c87d0158 ffff8801c80bfb18 ffffffff825bb061
[   28.234906]  ffff8801c87d0170 ffffed00390fa02b ffffed00390fa02e ffff8801c87d0168
[   28.242864]  dead4ead00000000 ffff8801c87d0140 0000000000000000 0000000000000000
[   28.250832] Call Trace:
[   28.253391]  [<ffffffff825bb061>] sg_remove_scat.isra.17+0x1c1/0x2d0
[   28.259850]  [<ffffffff825bb416>] sg_finish_rem_req+0x2a6/0x320
[   28.265879]  [<ffffffff81236f3b>] ? trace_hardirqs_on_caller+0x38b/0x590
[   28.272700]  [<ffffffff825bb4cc>] sg_new_read+0x3c/0x420
[   28.278119]  [<ffffffff825b97e2>] ? sg_get_rq_mark+0x142/0x190
[   28.284057]  [<ffffffff825bd19f>] sg_read+0x8cf/0x14d0
[   28.289300]  [<ffffffff825bc8d0>] ? sg_proc_seq_show_debug+0xda0/0xda0
[   28.295937]  [<ffffffff8150e929>] ? do_huge_pmd_anonymous_page+0x549/0xa10
[   28.302919]  [<ffffffff825bc8d0>] ? sg_proc_seq_show_debug+0xda0/0xda0
[   28.309563]  [<ffffffff8151d6e3>] __vfs_read+0x103/0x440
[   28.314980]  [<ffffffff8151d5e0>] ? vfs_iter_write+0x2d0/0x2d0
[   28.320919]  [<ffffffff815ea0cd>] ? fsnotify+0x5ad/0xee0
[   28.326336]  [<ffffffff815eaa00>] ? fsnotify+0xee0/0xee0
[   28.331755]  [<ffffffff81b4f719>] ? avc_policy_seqno+0x9/0x20
[   28.337612]  [<ffffffff81b60de8>] ? selinux_file_permission+0x348/0x460
[   28.344332]  [<ffffffff81b46619>] ? security_file_permission+0x89/0x1e0
[   28.351050]  [<ffffffff8151f270>] ? rw_verify_area+0x100/0x2f0
[   28.356990]  [<ffffffff8151f583>] vfs_read+0x123/0x3a0
[   28.362234]  [<ffffffff81521ec9>] SyS_read+0xd9/0x1b0
[   28.367394]  [<ffffffff81521df0>] ? do_sendfile+0xd30/0xd30
[   28.373084]  [<ffffffff81003044>] ? lockdep_sys_exit_thunk+0x12/0x14
[   28.379556]  [<ffffffff837797e5>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   28.386099] Code: c6 a0 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 
[   28.412671] RIP  [<ffffffff81434eb1>] __free_pages+0x21/0x90
[   28.418553]  RSP <ffff8801c80bfaa8>
[   28.423018] ---[ end trace 44195bc4cef0773f ]---
[   28.427789] Kernel panic - not syncing: Fatal exception
[   28.433553] Dumping ftrace buffer:
[   28.437066]    (ftrace buffer empty)
[   28.440746] Kernel Offset: disabled
[   28.444342] Rebooting in 86400 seconds..