[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.669376] 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: [ 20.606786] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 20.895180] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.606762] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) [ 21.777507] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. [ 27.531700] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) executing program [ 27.621549] BUG: unable to handle kernel paging request at ffffeafff8cd8008 [ 27.629156] IP: [] page_remove_rmap+0x2e/0x260 [ 27.635518] PGD 0 [ 27.637787] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.642797] Dumping ftrace buffer: [ 27.646331] (ftrace buffer empty) [ 27.650029] Modules linked in: [ 27.653453] CPU: 0 PID: 3700 Comm: syz-executor407 Not tainted 4.4.150-g5541782 #19 [ 27.661265] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.670644] task: ffff8801ce551800 task.stack: ffff8801cd9b0000 [ 27.676689] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 27.685604] RSP: 0018:ffff8801cd9b7948 EFLAGS: 00010246 [ 27.691040] RAX: dffffc0000000000 RBX: ffffeafff8cd8000 RCX: 0000000000000000 [ 27.698431] RDX: 1ffffd5fff19b001 RSI: ffffffff814bceaf RDI: ffffeafff8cd8008 [ 27.705689] RBP: ffff8801cd9b7958 R08: ffffffff85314df0 R09: 0000000000000000 [ 27.713035] R10: 0000000000000001 R11: ffff8801ce551800 R12: 0000000000000001 [ 27.720318] R13: 1ffff10039b36f2f R14: ffff8801d2df9800 R15: ffffeafff8cd8000 [ 27.727578] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.735793] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.741748] CR2: ffffeafff8cd8008 CR3: 00000001d09b1000 CR4: 00000000001606f0 [ 27.749013] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.756272] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.763615] Stack: [ 27.765752] ffff8801cd9b7bd8 0000000000000001 ffff8801cd9b7a00 ffffffff8150ad13 [ 27.773880] 00003ffe336001e0 00003ffe336001e0 0000000041b58ab3 ffffffff841ef837 [ 27.781994] ffffffff8150ab10 00000000000004f0 ffff8801d265d738 ffff8801cd9b79c8 [ 27.790048] Call Trace: [ 27.792625] [] zap_huge_pmd+0x203/0x510 [ 27.798851] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 27.805415] [] unmap_single_vma+0xea3/0x1240 [ 27.811461] [] ? vm_normal_page+0x280/0x280 [ 27.817420] [] ? __put_single_page+0x60/0x60 [ 27.823466] [] unmap_vmas+0x81/0xd0 [ 27.828733] [] exit_mmap+0x1c9/0x3a0 [ 27.834083] [] ? SyS_remap_file_pages+0x870/0x870 [ 27.840563] [] ? up_write+0x1a/0x60 [ 27.845827] [] mmput+0xf8/0x2d0 [ 27.850745] [] do_exit+0x8d8/0x26b0 [ 27.856014] [] ? file_map_prot_check+0x193/0x310 [ 27.862409] [] ? release_task.part.17+0x1200/0x1200 [ 27.869121] [] ? SyS_mprotect+0x41e/0x640 [ 27.875019] [] ? up_write+0x1a/0x60 [ 27.880360] [] ? SyS_mprotect+0x423/0x640 [ 27.886149] [] do_group_exit+0x111/0x330 [ 27.891847] [] ? do_group_exit+0x330/0x330 [ 27.897718] [] SyS_exit_group+0x1d/0x20 [ 27.903334] [] do_fast_syscall_32+0x324/0x8b0 [ 27.909469] [] sysenter_flags_fixed+0xd/0x1a [ 27.915567] 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 [ 27.943639] RIP [] page_remove_rmap+0x2e/0x260 [ 27.950192] RSP [ 27.953805] CR2: ffffeafff8cd8008 [ 27.957248] ---[ end trace 768645ad29ebfaf9 ]--- [ 27.961991] Kernel panic - not syncing: Fatal exception [ 27.968169] Dumping ftrace buffer: [ 27.971708] (ftrace buffer empty) [ 27.975440] Kernel Offset: disabled [ 27.979190] Rebooting in 86400 seconds..