[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.829831] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 22.025700] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [ 22.459735] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 23.077545] random: sshd: uninitialized urandom read (32 bytes read, 54 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.270135] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. [ 28.799009] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) executing program [ 28.891510] BUG: unable to handle kernel paging request at ffffeafffd458008 [ 28.898882] IP: [] page_remove_rmap+0x2e/0x260 [ 28.905150] PGD 0 [ 28.907414] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.912421] Dumping ftrace buffer: [ 28.915947] (ftrace buffer empty) [ 28.919643] Modules linked in: [ 28.922948] CPU: 0 PID: 3838 Comm: syz-executor872 Not tainted 4.4.148-gf057ff9 #81 [ 28.930951] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.940308] task: ffff8801d979c800 task.stack: ffff8800bba70000 [ 28.946351] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.955047] RSP: 0018:ffff8800bba779c0 EFLAGS: 00010246 [ 28.960481] RAX: dffffc0000000000 RBX: ffffeafffd458000 RCX: 0000000000000000 [ 28.967806] RDX: 1ffffd5fffa8b001 RSI: ffffffff814bc75f RDI: ffffeafffd458008 [ 28.975061] RBP: ffff8800bba779d0 R08: ffffffff85333170 R09: 0000000000000000 [ 28.982318] R10: 0000000000000001 R11: ffff8801d979c800 R12: 0000000000000001 [ 28.989577] R13: 1ffff1001774ef3e R14: ffff8800affd1800 R15: ffffeafffd458000 [ 28.996833] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.005196] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.011363] CR2: ffffeafffd458008 CR3: 00000000afed2000 CR4: 00000000001606f0 [ 29.018622] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.025876] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.033335] Stack: [ 29.035470] ffff8800bba77c50 0000000000000001 ffff8800bba77a78 ffffffff8150a1f3 [ 29.043502] 00003fff516001e0 00003fff516001e0 0000000041b58ab3 ffffffff841ef82f [ 29.051584] ffffffff81509ff0 00000000000004f0 ffff8800b0c13898 ffff8800bba77a40 [ 29.059681] Call Trace: [ 29.062253] [] zap_huge_pmd+0x203/0x510 [ 29.068179] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.074745] [] unmap_single_vma+0xea3/0x1240 [ 29.080789] [] ? vm_normal_page+0x230/0x230 [ 29.086748] [] ? __put_single_page+0x60/0x60 [ 29.092792] [] unmap_vmas+0x81/0xd0 [ 29.098055] [] exit_mmap+0x1c9/0x3a0 [ 29.103460] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.109944] [] ? up_write+0x1a/0x60 [ 29.115207] [] mmput+0xf8/0x2d0 [ 29.120123] [] do_exit+0x8d8/0x26b0 [ 29.125388] [] ? file_map_prot_check+0x193/0x310 [ 29.131781] [] ? release_task.part.17+0x1200/0x1200 [ 29.138435] [] ? SyS_mprotect+0x41e/0x640 [ 29.144218] [] ? up_write+0x1a/0x60 [ 29.149527] [] ? SyS_mprotect+0x423/0x640 [ 29.155317] [] do_group_exit+0x111/0x330 [ 29.161016] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.167541] [] SyS_exit_group+0x1d/0x20 [ 29.173153] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 29.179711] Code: e5 41 54 53 48 89 fb e8 e1 77 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 b3 77 e9 ff f0 83 43 18 ff 78 [ 29.207395] RIP [] page_remove_rmap+0x2e/0x260 [ 29.213763] RSP [ 29.217420] CR2: ffffeafffd458008 [ 29.220864] ---[ end trace 9eeb6f5aac629eeb ]--- [ 29.225604] Kernel panic - not syncing: Fatal exception [ 29.231605] Dumping ftrace buffer: [ 29.235140] (ftrace buffer empty) [ 29.238834] Kernel Offset: disabled [ 29.242495] Rebooting in 86400 seconds..