[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.183978] 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: [ 26.219854] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.629670] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.251165] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) [ 27.416042] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) Warning: Permanently added '10.128.10.33' (ECDSA) to the list of known hosts. [ 33.154125] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) executing program [ 33.254641] BUG: unable to handle kernel paging request at ffffeafff8cb0008 [ 33.261986] IP: [] page_remove_rmap+0x2e/0x260 [ 33.268242] PGD 0 [ 33.270481] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.275418] Dumping ftrace buffer: [ 33.278998] (ftrace buffer empty) [ 33.282688] Modules linked in: [ 33.285974] CPU: 0 PID: 3844 Comm: syz-executor690 Not tainted 4.4.150-g5541782 #19 [ 33.293749] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.303076] task: ffff8801d9086000 task.stack: ffff8801cc0b8000 [ 33.309101] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.317973] RSP: 0018:ffff8801cc0bf948 EFLAGS: 00010246 [ 33.323464] RAX: dffffc0000000000 RBX: ffffeafff8cb0000 RCX: ffffea0002ac8000 [ 33.330718] RDX: 1ffffd5fff196001 RSI: ffffffff814bceaf RDI: ffffeafff8cb0008 [ 33.337968] RBP: ffff8801cc0bf958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.345289] R10: 0000000000000001 R11: ffff8801d9086000 R12: 0000000000000001 [ 33.352538] R13: 1ffff10039817f2f R14: ffff8801ce943800 R15: ffffeafff8cb0000 [ 33.359784] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.368081] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.373939] CR2: ffffeafff8cb0008 CR3: 00000001cf950000 CR4: 00000000001606f0 [ 33.381182] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.388425] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.395665] Stack: [ 33.397787] ffff8801cc0bfbd8 0000000000000001 ffff8801cc0bfa00 ffffffff8150ad13 [ 33.405769] 00003ffe32c001e0 00003ffe32c001e0 0000000041b58ab3 ffffffff841ef837 [ 33.413760] ffffffff8150ab10 00000000000004f0 ffff8801caf112c0 ffff8801cc0bf9c8 [ 33.421829] Call Trace: [ 33.424399] [] zap_huge_pmd+0x203/0x510 [ 33.430111] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.436754] [] unmap_single_vma+0xea3/0x1240 [ 33.442786] [] ? vm_normal_page+0x280/0x280 [ 33.448732] [] ? __put_single_page+0x60/0x60 [ 33.454767] [] unmap_vmas+0x81/0xd0 [ 33.460022] [] exit_mmap+0x1c9/0x3a0 [ 33.465359] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.471829] [] ? up_write+0x1a/0x60 [ 33.477082] [] mmput+0xf8/0x2d0 [ 33.482071] [] do_exit+0x8d8/0x26b0 [ 33.487325] [] ? file_map_prot_check+0x193/0x310 [ 33.493705] [] ? release_task.part.17+0x1200/0x1200 [ 33.500355] [] ? SyS_mprotect+0x41e/0x640 [ 33.506131] [] ? up_write+0x1a/0x60 [ 33.511441] [] ? SyS_mprotect+0x423/0x640 [ 33.517222] [] do_group_exit+0x111/0x330 [ 33.522909] [] ? do_group_exit+0x330/0x330 [ 33.528770] [] SyS_exit_group+0x1d/0x20 [ 33.534462] [] do_fast_syscall_32+0x324/0x8b0 [ 33.540589] [] sysenter_flags_fixed+0xd/0x1a [ 33.546618] Code: e5 41 54 53 48 89 fb e8 31 76 e9 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 de 01 00 00 43 08 01 0f 84 4e 01 00 00 e8 03 76 e9 ff f0 83 43 18 ff 78 [ 33.573642] RIP [] page_remove_rmap+0x2e/0x260 [ 33.580017] RSP [ 33.583623] CR2: ffffeafff8cb0008 [ 33.587050] ---[ end trace 395aeac878d963ec ]--- [ 33.591774] Kernel panic - not syncing: Fatal exception [ 33.597470] Dumping ftrace buffer: [ 33.600985] (ftrace buffer empty) [ 33.604666] Kernel Offset: disabled [ 33.608267] Rebooting in 86400 seconds..