[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.685411] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.850354] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.117256] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 23.818563] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) [ 23.986730] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 29.606550] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) executing program [ 29.698993] BUG: unable to handle kernel paging request at ffffeafffd330008 [ 29.706374] IP: [] page_remove_rmap+0x2e/0x260 [ 29.712629] PGD 0 [ 29.714886] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.719906] Dumping ftrace buffer: [ 29.723418] (ftrace buffer empty) [ 29.727117] Modules linked in: [ 29.730402] CPU: 0 PID: 3789 Comm: syz-executor847 Not tainted 4.4.150-g5541782 #19 [ 29.738167] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.747498] task: ffff8801ca810000 task.stack: ffff8800aed70000 [ 29.753551] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.762242] RSP: 0018:ffff8800aed77948 EFLAGS: 00010246 [ 29.767666] RAX: dffffc0000000000 RBX: ffffeafffd330000 RCX: ffffea0007268000 [ 29.774916] RDX: 1ffffd5fffa66001 RSI: ffffffff814bceaf RDI: ffffeafffd330008 [ 29.782172] RBP: ffff8800aed77958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 29.789418] R10: 0000000000000001 R11: ffff8801ca810000 R12: 0000000000000001 [ 29.796664] R13: 1ffff10015daef2f R14: ffff8800b54cb800 R15: ffffeafffd330000 [ 29.804160] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.812373] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.818230] CR2: ffffeafffd330008 CR3: 00000000b4906000 CR4: 00000000001606f0 [ 29.825518] Stack: [ 29.827666] ffff8800aed77bd8 0000000000000001 ffff8800aed77a00 ffffffff8150ad13 [ 29.835665] 00003fff4cc001e0 00003fff4cc001e0 0000000041b58ab3 ffffffff841ef837 [ 29.843693] ffffffff8150ab10 00000000000004f0 ffff8801d1b62cb8 ffff8800aed779c8 [ 29.851703] Call Trace: [ 29.854269] [] zap_huge_pmd+0x203/0x510 [ 29.859867] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.866447] [] unmap_single_vma+0xea3/0x1240 [ 29.872483] [] ? vm_normal_page+0x280/0x280 [ 29.878439] [] ? __put_single_page+0x60/0x60 [ 29.884476] [] unmap_vmas+0x81/0xd0 [ 29.889729] [] exit_mmap+0x1c9/0x3a0 [ 29.895081] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.901559] [] ? up_write+0x1a/0x60 [ 29.906852] [] mmput+0xf8/0x2d0 [ 29.911759] [] do_exit+0x8d8/0x26b0 [ 29.917020] [] ? file_map_prot_check+0x193/0x310 [ 29.923422] [] ? release_task.part.17+0x1200/0x1200 [ 29.930073] [] ? SyS_mprotect+0x41e/0x640 [ 29.935857] [] ? up_write+0x1a/0x60 [ 29.941126] [] ? SyS_mprotect+0x423/0x640 [ 29.946906] [] do_group_exit+0x111/0x330 [ 29.952603] [] ? do_group_exit+0x330/0x330 [ 29.958476] [] SyS_exit_group+0x1d/0x20 [ 29.964081] [] do_fast_syscall_32+0x324/0x8b0 [ 29.970217] [] sysenter_flags_fixed+0xd/0x1a [ 29.976248] 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 [ 30.003252] RIP [] page_remove_rmap+0x2e/0x260 [ 30.009615] RSP [ 30.013217] CR2: ffffeafffd330008 [ 30.016654] ---[ end trace bcb55638b5bbd120 ]--- [ 30.021381] Kernel panic - not syncing: Fatal exception [ 30.026777] Dumping ftrace buffer: [ 30.030294] (ftrace buffer empty) [ 30.033979] Kernel Offset: disabled [ 30.037594] Rebooting in 86400 seconds..