[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.875121] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 22.997465] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.360525] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.046391] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) [ 24.288647] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) Warning: Permanently added '10.128.10.56' (ECDSA) to the list of known hosts. [ 29.831393] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) executing program [ 29.922793] BUG: unable to handle kernel paging request at ffffeafff8ca0008 [ 29.930214] IP: [] page_remove_rmap+0x2e/0x260 [ 29.936472] PGD 0 [ 29.938717] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.943712] Dumping ftrace buffer: [ 29.947225] (ftrace buffer empty) [ 29.950912] Modules linked in: [ 29.954198] CPU: 1 PID: 3819 Comm: syz-executor577 Not tainted 4.4.150-g5541782 #19 [ 29.961963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.971306] task: ffff8801c9646000 task.stack: ffff8801c8d50000 [ 29.977336] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.986071] RSP: 0018:ffff8801c8d57948 EFLAGS: 00010246 [ 29.991601] RAX: dffffc0000000000 RBX: ffffeafff8ca0000 RCX: 0000000000000000 [ 29.998848] RDX: 1ffffd5fff194001 RSI: ffffffff814bceaf RDI: ffffeafff8ca0008 [ 30.008013] RBP: ffff8801c8d57958 R08: ffffffff85333170 R09: 0000000000000000 [ 30.015256] R10: 0000000000000001 R11: ffff8801c9646000 R12: 0000000000000001 [ 30.022524] R13: 1ffff100391aaf2f R14: ffff8801cb276800 R15: ffffeafff8ca0000 [ 30.029778] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.037977] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 30.043831] CR2: ffffeafff8ca0008 CR3: 00000001d2369000 CR4: 00000000001606f0 [ 30.051096] Stack: [ 30.053218] ffff8801c8d57bd8 0000000000000001 ffff8801c8d57a00 ffffffff8150ad13 [ 30.061255] 00003ffe328001e0 00003ffe328001e0 0000000041b58ab3 ffffffff841ef837 [ 30.069256] ffffffff8150ab10 00000000000004f0 ffff8800b3ab8ec8 ffff8801c8d579c8 [ 30.077257] Call Trace: [ 30.079820] [] zap_huge_pmd+0x203/0x510 [ 30.085448] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 30.092178] [] unmap_single_vma+0xea3/0x1240 [ 30.098213] [] ? vm_normal_page+0x280/0x280 [ 30.104164] [] ? __put_single_page+0x60/0x60 [ 30.110201] [] unmap_vmas+0x81/0xd0 [ 30.115453] [] exit_mmap+0x1c9/0x3a0 [ 30.120793] [] ? SyS_remap_file_pages+0x870/0x870 [ 30.127263] [] ? up_write+0x1a/0x60 [ 30.132522] [] mmput+0xf8/0x2d0 [ 30.138425] [] do_exit+0x8d8/0x26b0 [ 30.144075] [] ? file_map_prot_check+0x193/0x310 [ 30.150457] [] ? release_task.part.17+0x1200/0x1200 [ 30.157099] [] ? SyS_mprotect+0x41e/0x640 [ 30.162884] [] ? up_write+0x1a/0x60 [ 30.168140] [] ? SyS_mprotect+0x423/0x640 [ 30.173925] [] do_group_exit+0x111/0x330 [ 30.179650] [] ? do_group_exit+0x330/0x330 [ 30.185510] [] SyS_exit_group+0x1d/0x20 [ 30.191112] [] do_fast_syscall_32+0x324/0x8b0 [ 30.197242] [] sysenter_flags_fixed+0xd/0x1a [ 30.203270] 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 [ 30.230398] RIP [] page_remove_rmap+0x2e/0x260 [ 30.236770] RSP [ 30.240369] CR2: ffffeafff8ca0008 [ 30.243812] ---[ end trace 4d010318697bfd5b ]--- [ 30.248586] Kernel panic - not syncing: Fatal exception [ 30.254245] Dumping ftrace buffer: [ 30.257770] (ftrace buffer empty) [ 30.261456] Kernel Offset: disabled [ 30.265070] Rebooting in 86400 seconds..