[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.758312] 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: [ 21.247364] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 21.509959] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 22.109319] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) [ 22.302292] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) Warning: Permanently added '10.128.0.54' (ECDSA) to the list of known hosts. [ 28.029496] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) executing program [ 28.117332] BUG: unable to handle kernel paging request at ffffeafffd340008 [ 28.124674] IP: [] page_remove_rmap+0x2e/0x260 [ 28.130915] PGD 0 [ 28.133164] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.138119] Dumping ftrace buffer: [ 28.141634] (ftrace buffer empty) [ 28.145318] Modules linked in: [ 28.148602] CPU: 0 PID: 3689 Comm: syz-executor881 Not tainted 4.4.150-g5541782 #19 [ 28.156365] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.165693] task: ffff8801cedec800 task.stack: ffff8800b5f18000 [ 28.171723] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.180401] RSP: 0018:ffff8800b5f1f948 EFLAGS: 00010246 [ 28.185825] RAX: dffffc0000000000 RBX: ffffeafffd340000 RCX: 0000000000000000 [ 28.193087] RDX: 1ffffd5fffa68001 RSI: ffffffff814bceaf RDI: ffffeafffd340008 [ 28.200333] RBP: ffff8800b5f1f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.207575] R10: 0000000000000001 R11: ffff8801cedec800 R12: 0000000000000001 [ 28.214818] R13: 1ffff10016be3f2f R14: ffff8800b58e0800 R15: ffffeafffd340000 [ 28.222075] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.230272] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.236157] CR2: ffffeafffd340008 CR3: 00000000b5500000 CR4: 00000000001606f0 [ 28.243405] Stack: [ 28.245529] ffff8800b5f1fbd8 0000000000000001 ffff8800b5f1fa00 ffffffff8150ad13 [ 28.253529] 00003fff4d0001e0 00003fff4d0001e0 0000000041b58ab3 ffffffff841ef837 [ 28.261523] ffffffff8150ab10 00000000000004f0 ffff8800b5bc2420 ffff8800b5f1f9c8 [ 28.269517] Call Trace: [ 28.272078] [] zap_huge_pmd+0x203/0x510 [ 28.277677] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.284227] [] unmap_single_vma+0xea3/0x1240 [ 28.290268] [] ? vm_normal_page+0x280/0x280 [ 28.296211] [] ? __put_single_page+0x60/0x60 [ 28.302255] [] unmap_vmas+0x81/0xd0 [ 28.307522] [] exit_mmap+0x1c9/0x3a0 [ 28.312886] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.319364] [] ? up_write+0x1a/0x60 [ 28.324633] [] mmput+0xf8/0x2d0 [ 28.329551] [] do_exit+0x8d8/0x26b0 [ 28.334801] [] ? handle_mm_fault+0x19b9/0x3180 [ 28.341008] [] ? release_task.part.17+0x1200/0x1200 [ 28.347646] [] do_group_exit+0x111/0x330 [ 28.353346] [] ? do_group_exit+0x330/0x330 [ 28.359206] [] SyS_exit_group+0x1d/0x20 [ 28.364804] [] do_fast_syscall_32+0x324/0x8b0 [ 28.370942] [] sysenter_flags_fixed+0xd/0x1a [ 28.376980] 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 [ 28.403876] RIP [] page_remove_rmap+0x2e/0x260 [ 28.410209] RSP [ 28.413803] CR2: ffffeafffd340008 [ 28.417242] ---[ end trace d7b06ac921f695f4 ]--- [ 28.421967] Kernel panic - not syncing: Fatal exception [ 28.427641] Dumping ftrace buffer: [ 28.431162] (ftrace buffer empty) [ 28.434843] Kernel Offset: disabled [ 28.438441] Rebooting in 86400 seconds..