[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.620439] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.852512] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.281297] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.983671] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) [ 27.150888] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. [ 32.689445] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) executing program [ 32.781071] BUG: unable to handle kernel paging request at ffffeafffd3b8008 [ 32.788431] IP: [] page_remove_rmap+0x2e/0x260 [ 32.794684] PGD 0 [ 32.796989] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.802004] Dumping ftrace buffer: [ 32.805514] (ftrace buffer empty) [ 32.809222] Modules linked in: [ 32.812598] CPU: 0 PID: 3846 Comm: syz-executor087 Not tainted 4.4.150-g5541782 #19 [ 32.820362] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.829690] task: ffff8801d9159800 task.stack: ffff8800ad9f8000 [ 32.835724] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.844401] RSP: 0018:ffff8800ad9ff948 EFLAGS: 00010246 [ 32.849830] RAX: dffffc0000000000 RBX: ffffeafffd3b8000 RCX: 0000000000000000 [ 32.857080] RDX: 1ffffd5fffa77001 RSI: ffffffff814bceaf RDI: ffffeafffd3b8008 [ 32.864323] RBP: ffff8800ad9ff958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.871569] R10: 0000000000000001 R11: ffff8801d9159800 R12: 0000000000000001 [ 32.878866] R13: 1ffff10015b3ff2f R14: ffff8800bb8e5800 R15: ffffeafffd3b8000 [ 32.886117] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.894424] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.900281] CR2: ffffeafffd3b8008 CR3: 00000000ac728000 CR4: 00000000001606f0 [ 32.907530] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.914775] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.922289] Stack: [ 32.924414] ffff8800ad9ffbd8 0000000000000001 ffff8800ad9ffa00 ffffffff8150ad13 [ 32.932407] 00003fff4ee001e0 00003fff4ee001e0 0000000041b58ab3 ffffffff841ef837 [ 32.940415] ffffffff8150ab10 00000000000004f0 ffff8800afe1b210 ffff8800ad9ff9c8 [ 32.948412] Call Trace: [ 32.950982] [] zap_huge_pmd+0x203/0x510 [ 32.956721] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.963280] [] unmap_single_vma+0xea3/0x1240 [ 32.969319] [] ? vm_normal_page+0x280/0x280 [ 32.975265] [] ? __put_single_page+0x60/0x60 [ 32.981296] [] unmap_vmas+0x81/0xd0 [ 32.986552] [] exit_mmap+0x1c9/0x3a0 [ 32.991908] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.998381] [] ? up_write+0x1a/0x60 [ 33.003649] [] mmput+0xf8/0x2d0 [ 33.008567] [] do_exit+0x8d8/0x26b0 [ 33.013842] [] ? file_map_prot_check+0x193/0x310 [ 33.020382] [] ? release_task.part.17+0x1200/0x1200 [ 33.027027] [] ? SyS_mprotect+0x41e/0x640 [ 33.032809] [] ? up_write+0x1a/0x60 [ 33.038057] [] ? SyS_mprotect+0x423/0x640 [ 33.043830] [] do_group_exit+0x111/0x330 [ 33.049526] [] ? do_group_exit+0x330/0x330 [ 33.055383] [] SyS_exit_group+0x1d/0x20 [ 33.060981] [] do_fast_syscall_32+0x324/0x8b0 [ 33.067098] [] sysenter_flags_fixed+0xd/0x1a [ 33.073122] 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 [ 33.100057] RIP [] page_remove_rmap+0x2e/0x260 [ 33.106379] RSP [ 33.109974] CR2: ffffeafffd3b8008 [ 33.113403] ---[ end trace b65a5aa02e77f95e ]--- [ 33.118140] Kernel panic - not syncing: Fatal exception [ 33.123828] Dumping ftrace buffer: [ 33.127418] (ftrace buffer empty) [ 33.131193] Kernel Offset: disabled [ 33.134838] Rebooting in 86400 seconds..