[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   18.171782] 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: [   20.494699] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available)
[   20.792493] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available)
[   21.756487] random: sshd: uninitialized urandom read (32 bytes read, 119 bits of entropy available)
[   21.906628] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available)
Warning: Permanently added '10.128.10.13' (ECDSA) to the list of known hosts.
[   27.308755] random: nonblocking pool is initialized
executing program
[   27.406016] kasan: CONFIG_KASAN_INLINE enabled
[   27.410942] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
[   27.423782] Dumping ftrace buffer:
[   27.427289]    (ftrace buffer empty)
[   27.430964] Modules linked in:
[   27.434234] CPU: 1 PID: 3642 Comm: syzkaller757679 Not tainted 4.4.125-g38f41ec #63
[   27.441989] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   27.451312] task: ffff8801ce2a6000 task.stack: ffff8800b5c30000
[   27.457337] RIP: 0010:[<ffffffff81435041>]  [<ffffffff81435041>] __free_pages+0x21/0x90
[   27.465564] RSP: 0018:ffff8800b5c37a40  EFLAGS: 00010a07
[   27.470979] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825bb1fb
[   27.478214] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c
[   27.485452] RBP: ffff8800b5c37a50 R08: 0000000000000000 R09: 0000000000000001
[   27.492689] R10: 0000000000000000 R11: 1ffff10016b86f26 R12: 0000000000000004
[   27.499927] R13: 0000000000000020 R14: ffff8800b5fc0000 R15: dffffc0000000000
[   27.507164] FS:  0000000002053880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   27.515357] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   27.521207] CR2: 0000000020e43000 CR3: 00000000b317a000 CR4: 0000000000160670
[   27.528447] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   27.535684] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   27.542919] Stack:
[   27.545042]  0000000000000246 ffff8800b5fc0158 ffff8800b5c37ab0 ffffffff825bb221
[   27.553005]  ffff8800b5fc0170 ffffed0016bf802b ffffed0016bf802e ffff8800b5fc0168
[   27.560962]  dead4ead00000000 ffff8800b5fc0140 0000000000000000 0000000000000000
[   27.568921] Call Trace:
[   27.571475]  [<ffffffff825bb221>] sg_remove_scat.isra.17+0x1c1/0x2d0
[   27.577933]  [<ffffffff825bb5d6>] sg_finish_rem_req+0x2a6/0x320
[   27.583961]  [<ffffffff825bd4c2>] sg_read+0xa32/0x14d0
[   27.589205]  [<ffffffff81515f84>] ? __check_object_size+0x154/0x35b
[   27.595578]  [<ffffffff825bca90>] ? sg_proc_seq_show_debug+0xda0/0xda0
[   27.602211]  [<ffffffff815eab90>] ? fsnotify+0xee0/0xee0
[   27.607632]  [<ffffffff81b4f8a9>] ? avc_policy_seqno+0x9/0x20
[   27.613489]  [<ffffffff8151e141>] do_loop_readv_writev+0x141/0x1e0
[   27.619778]  [<ffffffff81b467a9>] ? security_file_permission+0x89/0x1e0
[   27.626494]  [<ffffffff825bca90>] ? sg_proc_seq_show_debug+0xda0/0xda0
[   27.633126]  [<ffffffff825bca90>] ? sg_proc_seq_show_debug+0xda0/0xda0
[   27.639759]  [<ffffffff8152049d>] do_readv_writev+0x5dd/0x6e0
[   27.645607]  [<ffffffff8151fec0>] ? vfs_write+0x530/0x530
[   27.651111]  [<ffffffff83778e2c>] ? _raw_spin_unlock+0x2c/0x50
[   27.657051]  [<ffffffff8150e94d>] ? do_huge_pmd_anonymous_page+0x3dd/0xa10
[   27.664029]  [<ffffffff814a1182>] ? handle_mm_fault+0x3f2/0x3190
[   27.670139]  [<ffffffff815507be>] ? putname+0xee/0x130
[   27.675383]  [<ffffffff81520618>] vfs_readv+0x78/0xb0
[   27.680536]  [<ffffffff81522949>] SyS_readv+0xd9/0x240
[   27.685776]  [<ffffffff81522870>] ? rw_copy_check_uvector+0x2b0/0x2b0
[   27.692319]  [<ffffffff81003044>] ? lockdep_sys_exit_thunk+0x12/0x14
[   27.698777]  [<ffffffff83779965>] entry_SYSCALL_64_fastpath+0x22/0x9e
[   27.705320] 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 
[   27.731772] RIP  [<ffffffff81435041>] __free_pages+0x21/0x90
[   27.737653]  RSP <ffff8800b5c37a40>
[   27.743910] ---[ end trace 9401c83e75f224ce ]---
[   27.750019] Kernel panic - not syncing: Fatal exception
[   27.755801] Dumping ftrace buffer:
[   27.759307]    (ftrace buffer empty)
[   27.762983] Kernel Offset: disabled
[   27.766577] Rebooting in 86400 seconds..