[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   20.372288] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   25.307052] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available)
[   25.659351] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available)
[   26.630343] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available)
[   26.802123] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available)
Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts.
[   32.217606] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available)
executing program
[   32.308983] kasan: CONFIG_KASAN_INLINE enabled
[   32.313609] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
[   32.326447] Dumping ftrace buffer:
[   32.329955]    (ftrace buffer empty)
[   32.333640] Modules linked in:
[   32.336913] CPU: 1 PID: 3782 Comm: syzkaller149205 Not tainted 4.4.120-gd63fdf6 #28
[   32.344678] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.354000] task: ffff8801d93b4800 task.stack: ffff8800b4c70000
[   32.360021] RIP: 0010:[<ffffffff81434701>]  [<ffffffff81434701>] __free_pages+0x21/0x90
[   32.368248] RSP: 0018:ffff8800b4c77ab0  EFLAGS: 00010a07
[   32.373662] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b85eb
[   32.380905] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c
[   32.388143] RBP: ffff8800b4c77ac0 R08: 0000000000000001 R09: 0000000000000001
[   32.395381] R10: 0000000000000000 R11: 1ffff1001698ef34 R12: 0000000000000004
[   32.402625] R13: 0000000000000020 R14: ffff8800b4e8c200 R15: dffffc0000000000
[   32.409863] FS:  000000000238f880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   32.418055] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.423905] CR2: 000000002012f000 CR3: 00000000ac1f0000 CR4: 0000000000160670
[   32.431147] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   32.438385] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   32.445622] Stack:
[   32.447737]  0000000000000246 ffff8800b4e8c358 ffff8800b4c77b20 ffffffff825b8611
[   32.455699]  ffff8800b4e8c370 ffffed00169d186b ffffed00169d186e ffff8800b4e8c368
[   32.463657]  dead4ead00000000 ffff8800b4e8c340 0000000000000000 0000000000000000
[   32.471616] Call Trace:
[   32.474176]  [<ffffffff825b8611>] sg_remove_scat.isra.17+0x1c1/0x2d0
[   32.480636]  [<ffffffff825b89d5>] sg_finish_rem_req+0x2b5/0x340
[   32.486662]  [<ffffffff825b8d96>] sg_new_read.isra.18+0x336/0x3c0
[   32.492861]  [<ffffffff825ba6fc>] sg_read+0x8bc/0x1490
[   32.498123]  [<ffffffff81230151>] ? __lock_is_held+0xa1/0xf0
[   32.503886]  [<ffffffff825b9e40>] ? sg_proc_seq_show_debug+0xda0/0xda0
[   32.510525]  [<ffffffff8150e179>] ? do_huge_pmd_anonymous_page+0x549/0xa10
[   32.517505]  [<ffffffff825b9e40>] ? sg_proc_seq_show_debug+0xda0/0xda0
[   32.524138]  [<ffffffff8151cf33>] __vfs_read+0x103/0x440
[   32.529560]  [<ffffffff8151ce30>] ? vfs_iter_write+0x2d0/0x2d0
[   32.535498]  [<ffffffff815e984d>] ? fsnotify+0x5ad/0xee0
[   32.540915]  [<ffffffff815ea180>] ? fsnotify+0xee0/0xee0
[   32.546343]  [<ffffffff81b4d1e9>] ? avc_policy_seqno+0x9/0x20
[   32.552196]  [<ffffffff81b5e8b8>] ? selinux_file_permission+0x348/0x460
[   32.558921]  [<ffffffff81b440e9>] ? security_file_permission+0x89/0x1e0
[   32.565638]  [<ffffffff8151eac0>] ? rw_verify_area+0x100/0x2f0
[   32.571574]  [<ffffffff8151edd3>] vfs_read+0x123/0x3a0
[   32.576817]  [<ffffffff81521719>] SyS_read+0xd9/0x1b0
[   32.581973]  [<ffffffff81521640>] ? do_sendfile+0xd30/0xd30
[   32.587648]  [<ffffffff81003044>] ? lockdep_sys_exit_thunk+0x12/0x14
[   32.594108]  [<ffffffff8377395f>] entry_SYSCALL_64_fastpath+0x1c/0x98
[   32.600653] 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 
[   32.627106] RIP  [<ffffffff81434701>] __free_pages+0x21/0x90
[   32.632989]  RSP <ffff8800b4c77ab0>
[   32.636703] ---[ end trace ebb4c858a59ea294 ]---
[   32.642057] Kernel panic - not syncing: Fatal exception
[   32.647888] Dumping ftrace buffer:
[   32.651399]    (ftrace buffer empty)
[   32.655077] Kernel Offset: disabled
[   32.658669] Rebooting in 86400 seconds..