[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.359019] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.752993] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.073878] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.755747] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) [ 22.943281] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) Warning: Permanently added '10.128.10.13' (ECDSA) to the list of known hosts. [ 28.588745] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) executing program [ 28.677504] BUG: unable to handle kernel paging request at ffffeafff8cd0008 [ 28.684868] IP: [] page_remove_rmap+0x2e/0x260 [ 28.691120] PGD 0 [ 28.693366] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.698328] Dumping ftrace buffer: [ 28.701844] (ftrace buffer empty) [ 28.705530] Modules linked in: [ 28.708817] CPU: 0 PID: 3828 Comm: syz-executor195 Not tainted 4.4.150-g5541782 #83 [ 28.716596] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.725939] task: ffff8800b77fc800 task.stack: ffff8801c8a38000 [ 28.731970] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.740649] RSP: 0018:ffff8801c8a3f9c0 EFLAGS: 00010246 [ 28.746073] RAX: dffffc0000000000 RBX: ffffeafff8cd0000 RCX: 0000000000000000 [ 28.753318] RDX: 1ffffd5fff19a001 RSI: ffffffff814bceaf RDI: ffffeafff8cd0008 [ 28.760564] RBP: ffff8801c8a3f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.767828] R10: 0000000000000001 R11: ffff8800b77fc800 R12: 0000000000000001 [ 28.775100] R13: 1ffff10039147f3e R14: ffff8801c9d1d800 R15: ffffeafff8cd0000 [ 28.782359] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.790575] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.796439] CR2: ffffeafff8cd0008 CR3: 00000001cb64e000 CR4: 00000000001606f0 [ 28.803685] Stack: [ 28.805807] ffff8801c8a3fc50 0000000000000001 ffff8801c8a3fa78 ffffffff8150ad13 [ 28.813857] 00003ffe334001e0 00003ffe334001e0 0000000041b58ab3 ffffffff841ef837 [ 28.821857] ffffffff8150ab10 00000000000004f0 ffff8801cd50c898 ffff8801c8a3fa40 [ 28.829856] Call Trace: [ 28.832430] [] zap_huge_pmd+0x203/0x510 [ 28.838049] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.844620] [] unmap_single_vma+0xea3/0x1240 [ 28.850651] [] ? vm_normal_page+0x280/0x280 [ 28.856600] [] ? __put_single_page+0x60/0x60 [ 28.862634] [] unmap_vmas+0x81/0xd0 [ 28.867889] [] exit_mmap+0x1c9/0x3a0 [ 28.873228] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.879711] [] ? up_write+0x1a/0x60 [ 28.884984] [] mmput+0xf8/0x2d0 [ 28.889900] [] do_exit+0x8d8/0x26b0 [ 28.895180] [] ? file_map_prot_check+0x193/0x310 [ 28.901588] [] ? release_task.part.17+0x1200/0x1200 [ 28.908231] [] ? SyS_mprotect+0x41e/0x640 [ 28.914005] [] ? up_write+0x1a/0x60 [ 28.919271] [] ? SyS_mprotect+0x423/0x640 [ 28.925061] [] do_group_exit+0x111/0x330 [ 28.930751] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.937233] [] SyS_exit_group+0x1d/0x20 [ 28.942850] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 28.949443] 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 [ 28.976495] RIP [] page_remove_rmap+0x2e/0x260 [ 28.982865] RSP [ 28.986464] CR2: ffffeafff8cd0008 [ 28.989911] ---[ end trace 1a9ff34295c0b344 ]--- [ 28.994641] Kernel panic - not syncing: Fatal exception [ 29.000284] Dumping ftrace buffer: [ 29.003804] (ftrace buffer empty) [ 29.007492] Kernel Offset: disabled [ 29.011109] Rebooting in 86400 seconds..